[#153] Add labels in metrics of total bytes

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

.forgejo/workflows/dco.yml

@@ -15,6 +15,6 @@ jobs:
           go-version: '1.20'
 
       - name: Run commit format checker
-        uses: https://git.alexvan.in/alexvanin/dco-go@v1
+        uses: https://git.frostfs.info/TrueCloudLab/dco-go@v1
         with:
           from: 3fbad97a

CHANGELOG.md

@@ -5,54 +5,84 @@ This document outlines major changes between releases.
 ## [Unreleased]
 
 ### Fixed
-- Clean up List and Name caches when object is missing in Tree service (#57)
-- Get empty bucket CORS from frostfs (TrueCloudLab#36)
-- Don't count pool error on client abort (#35)
-- Don't create unnecessary delete-markers (#83)
 - Handle negative `Content-Length` on put (#125)
 - Use `DisableURIPathEscaping` to presign urls (#125)
+- Use specific s3 errors instead of `InternalError` where possible (#143)
+- `grpc` schemas in tree configuration (#166)
+- Return appropriate 404 code when object missed in storage but there is in gate cache (#158)
+- Replace part on re-upload when use multipart upload (#176)
+- Fix goroutine leak on put object error (#178)
+- Fix parsing signed headers in presigned urls (#182)
 
 ### Added
-- Reload default and custom copies numbers on SIGHUP (#104)
-- Add `copies_numbers` section to `placement_policy` in config file and support vectors of copies numbers (#70)
-- Return `X-Owner-Id` in `head-bucket` response (#79)
-- Return container name in `head-bucket` response (TrueCloudLab#18)
-- Billing metrics (TrueCloudLab#5)
-- Multiple configs support (TrueCloudLab#21)
-- Bucket name resolving policy (TrueCloudLab#25)
-- Support string `Action` and `Resource` fields in `bucketPolicy.Statement` (TrueCloudLab#32)
-- Add new `kludge.use_default_xmlns_for_complete_multipart` config param (TrueCloudLab#40)
 - Support dump metrics descriptions (#80)
-- Support impersonate bearer token (#81)
+- Add `copies_numbers` section to `placement_policy` in config file and support vectors of copies numbers (#70, #101)
+- Support impersonate bearer token (#81, #105)
+- Reload default and custom copies numbers on SIGHUP (#104)
+- Tracing support (#84, #140)
 - Return bearer token in `s3-authmate obtain-secret` result (#132)
+- Support multiple version credentials using GSet (#135)
+- Implement chunk uploading (#106)
+- Add new `kludge.bypass_content_encoding_check_in_chunks` config param (#146)
 
 ### Changed
-- Remove object from tree and reset its cache on object deletion when it is already removed from storage (#78)
 - Update prometheus to v1.15.0 (#94)
-- Update syncTree.sh due to recent renaming (#73)
-- Update neo-go to v0.101.0 (#14)
-- Update viper to v1.15.0 (#14)
-- Using multiple servers require only one healthy (TrueCloudLab#12)
-- Update go version to go1.18 (TrueCloudLab#16)
 - Update go version to go1.19 (#118)
-- Return error on invalid LocationConstraint (TrueCloudLab#23)
-- Place billing metrics to separate url path (TrueCloudLab#26)
-- Add generated deb builder files to .gitignore, and fix typo (TrueCloudLab#28)
-- Limit number of objects to delete at one time (TrueCloudLab#37)
-- CompleteMultipartUpload handler now sends whitespace characters to keep alive client's connection (#60)
-- Support new system attributes (#64)
-- Changed values for `frostfs_s3_gw_state_health` metric (#91)
-- Support multiple tree service endpoints (#74)
+- Remove object from tree and reset its cache on object deletion when it is already removed from storage (#78)
+- Finish rebranding (#2)
 - Timeout errors has code 504 now (#103)
-- Support multiple version credentials using GSet (#135)
 - Use request scope logger (#111)
+- Add `s3-authmate update-secret` command (#131)
+- Use default registerer for app metrics (#155)
+- Use chi router instead of archived gorlilla/mux (#149)
+- Complete multipart upload doesn't unnecessary copy now. Thus, the total time of multipart upload was reduced by 2 times (#63)
+- Use gate key to form object owner (#175)
 
 ### Removed
 - Drop `tree.service` param (now endpoints from `peers` section are used) (#133)
 
+## [0.27.0] - Karpinsky - 2023-07-12
+
+This is a first FrostFS S3 Gateway release named after
+[Karpinsky glacier](https://en.wikipedia.org/wiki/Karpinsky_Glacier).
+
+### Fixed
+- Using multiple servers require only one healthy (#12)
+- Renew token before it expires (#20)
+- Add generated deb builder files to .gitignore, and fix typo (#28)
+- Get empty bucket CORS from frostfs (#36)
+- Don't count pool error on client abort (#35)
+- Handle request cancelling (#69)
+- Clean up List and Name caches when object is missing in Tree service (#57)
+- Don't create unnecessary delete-markers (#83)
+- `Too many pings` error (#145)
+
+### Added
+- Billing metrics (#5, #26, #29)
+- Return container name in `head-bucket` response (#18)
+- Multiple configs support (#21)
+- Bucket name resolving policy (#25)
+- Support string `Action` and `Resource` fields in `bucketPolicy.Statement` (#32)
+- Add new `kludge.use_default_xmlns_for_complete_multipart` config param (#40)
+- Return `X-Owner-Id` in `head-bucket` response (#79)
+- Support multiple tree service endpoints (#74, #110, #114)
+
+### Changed
+- Repository rebranding (#1)
+- Update neo-go to v0.101.0 (#14)
+- Update viper to v1.15.0 (#14)
+- Update go version to go1.18 (#16)
+- Return error on invalid LocationConstraint (#23)
+- Limit number of objects to delete at one time (#37)
+- CompleteMultipartUpload handler now sends whitespace characters to keep alive client's connection (#60)
+- Support new system attributes (#64)
+- Abstract network communication in TreeClient (#59, #75)
+- Changed values for `frostfs_s3_gw_state_health` metric (#91)
+
 ## Older versions
 
 This project is a fork of [NeoFS S3 Gateway](https://github.com/nspcc-dev/neofs-s3-gw) from version v0.26.0.
 To see CHANGELOG for older versions, refer to https://github.com/nspcc-dev/neofs-s3-gw/blob/master/CHANGELOG.md.
 
-[Unreleased]: https://git.frostfs.info/TrueCloudLab/frostfs-s3-gw/compare/b2148cc3...master
+[0.27.0]: https://git.frostfs.info/TrueCloudLab/frostfs-s3-gw/compare/b2148cc3...v0.27.0
+[Unreleased]: https://git.frostfs.info/TrueCloudLab/frostfs-s3-gw/compare/v0.27.0...master

VERSION

@@ -1 +1 @@
-v0.26.0
+v0.27.0

api/auth/center.go

@@ -40,6 +40,7 @@ type (
 	Box struct {
 		AccessBox   *accessbox.Box
 		ClientTime  time.Time
+		AuthHeaders *AuthHeader
 	}
 
 	center struct {
@@ -51,7 +52,8 @@ type (
 
 	prs int
 
-	authHeader struct {
+	//nolint:revive
+	AuthHeader struct {
 		AccessKeyID  string
 		Service      string
 		Region       string
@@ -101,7 +103,7 @@ func New(frostFS tokens.FrostFS, key *keys.PrivateKey, prefixes []string, config
 	}
 }
 
-func (c *center) parseAuthHeader(header string) (*authHeader, error) {
+func (c *center) parseAuthHeader(header string) (*AuthHeader, error) {
 	submatches := c.reg.GetSubmatches(header)
 	if len(submatches) != authHeaderPartsNum {
 		return nil, apiErrors.GetAPIError(apiErrors.ErrAuthorizationHeaderMalformed)
@@ -114,7 +116,7 @@ func (c *center) parseAuthHeader(header string) (*authHeader, error) {
 
 	signedFields := strings.Split(submatches["signed_header_fields"], ";")
 
-	return &authHeader{
+	return &AuthHeader{
 		AccessKeyID:  submatches["access_key_id"],
 		Service:      submatches["service"],
 		Region:       submatches["region"],
@@ -124,7 +126,7 @@ func (c *center) parseAuthHeader(header string) (*authHeader, error) {
 	}, nil
 }
 
-func (a *authHeader) getAddress() (oid.Address, error) {
+func (a *AuthHeader) getAddress() (oid.Address, error) {
 	var addr oid.Address
 	if err := addr.DecodeString(strings.ReplaceAll(a.AccessKeyID, "0", "/")); err != nil {
 		return addr, apiErrors.GetAPIError(apiErrors.ErrInvalidAccessKeyID)
@@ -135,7 +137,7 @@ func (a *authHeader) getAddress() (oid.Address, error) {
 func (c *center) Authenticate(r *http.Request) (*Box, error) {
 	var (
 		err                  error
-		authHdr              *authHeader
+		authHdr              *AuthHeader
 		signatureDateTimeStr string
 		needClientTime       bool
 	)
@@ -146,12 +148,12 @@ func (c *center) Authenticate(r *http.Request) (*Box, error) {
 		if len(creds) != 5 || creds[4] != "aws4_request" {
 			return nil, fmt.Errorf("bad X-Amz-Credential")
 		}
-		authHdr = &authHeader{
+		authHdr = &AuthHeader{
 			AccessKeyID:  creds[0],
 			Service:      creds[3],
 			Region:       creds[2],
 			SignatureV4:  queryValues.Get(AmzSignature),
-			SignedFields: queryValues[AmzSignedHeaders],
+			SignedFields: strings.Split(queryValues.Get(AmzSignedHeaders), ";"),
 			Date:         creds[1],
 			IsPresigned:  true,
 		}
@@ -200,7 +202,10 @@ func (c *center) Authenticate(r *http.Request) (*Box, error) {
 		return nil, err
 	}
 
-	result := &Box{AccessBox: box}
+	result := &Box{
+		AccessBox:   box,
+		AuthHeaders: authHdr,
+	}
 	if needClientTime {
 		result.ClientTime = signatureDateTime
 	}
@@ -267,7 +272,7 @@ func (c *center) checkFormData(r *http.Request) (*Box, error) {
 	return &Box{AccessBox: box}, nil
 }
 
-func cloneRequest(r *http.Request, authHeader *authHeader) *http.Request {
+func cloneRequest(r *http.Request, authHeader *AuthHeader) *http.Request {
 	otherRequest := r.Clone(context.TODO())
 	otherRequest.Header = make(http.Header)
 
@@ -288,7 +293,7 @@ func cloneRequest(r *http.Request, authHeader *authHeader) *http.Request {
 	return otherRequest
 }
 
-func (c *center) checkSign(authHeader *authHeader, box *accessbox.Box, request *http.Request, signatureDateTime time.Time) error {
+func (c *center) checkSign(authHeader *AuthHeader, box *accessbox.Box, request *http.Request, signatureDateTime time.Time) error {
 	awsCreds := credentials.NewStaticCredentials(authHeader.AccessKeyID, box.Gate.AccessKey, "")
 	signer := v4.NewSigner(awsCreds)
 	signer.DisableURIPathEscaping = true

api/auth/center_test.go

@@ -19,12 +19,12 @@ func TestAuthHeaderParse(t *testing.T) {
 	for _, tc := range []struct {
 		header   string
 		err      error
-		expected *authHeader
+		expected *AuthHeader
 	}{
 		{
 			header: defaultHeader,
 			err:    nil,
-			expected: &authHeader{
+			expected: &AuthHeader{
 				AccessKeyID:  "oid0cid",
 				Service:      "s3",
 				Region:       "us-east-1",
@@ -54,29 +54,29 @@ func TestAuthHeaderGetAddress(t *testing.T) {
 	defaulErr := errors.GetAPIError(errors.ErrInvalidAccessKeyID)
 
 	for _, tc := range []struct {
-		authHeader *authHeader
+		authHeader *AuthHeader
 		err        error
 	}{
 		{
-			authHeader: &authHeader{
+			authHeader: &AuthHeader{
 				AccessKeyID: "vWqF8cMDRbJcvnPLALoQGnABPPhw8NyYMcGsfDPfZJM0HrgjonN8CgFvCZ3kh9BUXw4W2tJ5E7EAGhueSF122HB",
 			},
 			err: nil,
 		},
 		{
-			authHeader: &authHeader{
+			authHeader: &AuthHeader{
 				AccessKeyID: "vWqF8cMDRbJcvnPLALoQGnABPPhw8NyYMcGsfDPfZJMHrgjonN8CgFvCZ3kh9BUXw4W2tJ5E7EAGhueSF122HB",
 			},
 			err: defaulErr,
 		},
 		{
-			authHeader: &authHeader{
+			authHeader: &AuthHeader{
 				AccessKeyID: "oid0cid",
 			},
 			err: defaulErr,
 		},
 		{
-			authHeader: &authHeader{
+			authHeader: &AuthHeader{
 				AccessKeyID: "oidcid",
 			},
 			err: defaulErr,

api/auth/presign.go

@@ -34,6 +34,7 @@ func PresignRequest(creds *credentials.Credentials, reqData RequestData, presign
 	}
 
 	req.Header.Set(AmzDate, presignData.SignTime.Format("20060102T150405Z"))
+	req.Header.Set(ContentTypeHdr, "text/plain")
 
 	signer := v4.NewSigner(creds)
 	signer.DisableURIPathEscaping = true

api/data/tree.go

@@ -18,6 +18,7 @@ type NodeVersion struct {
 	BaseNodeVersion
 	DeleteMarker  *DeleteMarkerInfo
 	IsUnversioned bool
+	IsCombined    bool
 }
 
 func (v NodeVersion) IsDeleteMarker() bool {
@@ -79,13 +80,13 @@ type MultipartInfo struct {
 
 // PartInfo is upload information about part.
 type PartInfo struct {
-	Key      string
-	UploadID string
-	Number   int
-	OID      oid.ID
-	Size     uint64
-	ETag     string
-	Created  time.Time
+	Key      string    `json:"key"`
+	UploadID string    `json:"uploadId"`
+	Number   int       `json:"number"`
+	OID      oid.ID    `json:"oid"`
+	Size     uint64    `json:"size"`
+	ETag     string    `json:"etag"`
+	Created  time.Time `json:"created"`
 }
 
 // ToHeaderString form short part representation to use in S3-Completed-Parts header.

api/errors/errors.go

@@ -3,6 +3,8 @@ package errors
 import (
 	"fmt"
 	"net/http"
+
+	frosterrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
 )
 
 type (
@@ -178,6 +180,7 @@ const (
 	ErrGatewayTimeout
 	ErrOperationMaxedOut
 	ErrInvalidRequest
+	ErrInvalidRequestLargeCopy
 	ErrInvalidStorageClass
 
 	ErrMalformedJSON
@@ -1159,6 +1162,12 @@ var errorCodes = errorCodeMap{
 		Description:    "Invalid Request",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrInvalidRequestLargeCopy: {
+		ErrCode:        ErrInvalidRequestLargeCopy,
+		Code:           "InvalidRequest",
+		Description:    "CopyObject request made on objects larger than 5GB in size.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrIncorrectContinuationToken: {
 		ErrCode:        ErrIncorrectContinuationToken,
 		Code:           "InvalidArgument",
@@ -1700,6 +1709,7 @@ var errorCodes = errorCodeMap{
 
 // IsS3Error checks if the provided error is a specific s3 error.
 func IsS3Error(err error, code ErrorCode) bool {
+	err = frosterrors.UnwrapErr(err)
 	e, ok := err.(Error)
 	return ok && e.ErrCode == code
 }

api/handler/acl.go

@@ -19,6 +19,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
@@ -244,7 +245,7 @@ func (s *statement) UnmarshalJSON(data []byte) error {
 
 func (h *handler) GetBucketACLHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -258,7 +259,7 @@ func (h *handler) GetBucketACLHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err = api.EncodeToResponse(w, h.encodeBucketACL(ctx, bktInfo.Name, bucketACL)); err != nil {
+	if err = middleware.EncodeToResponse(w, h.encodeBucketACL(ctx, bktInfo.Name, bucketACL)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 		return
 	}
@@ -282,7 +283,7 @@ func (h *handler) bearerTokenIssuerKey(ctx context.Context) (*keys.PublicKey, er
 }
 
 func (h *handler) PutBucketACLHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	key, err := h.bearerTokenIssuerKey(r.Context())
 	if err != nil {
 		h.logAndSendError(w, "couldn't get bearer token issuer key", reqInfo, err)
@@ -367,7 +368,7 @@ func (h *handler) updateBucketACL(r *http.Request, astChild *ast, bktInfo *data.
 
 func (h *handler) GetObjectACLHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -393,14 +394,14 @@ func (h *handler) GetObjectACLHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err = api.EncodeToResponse(w, h.encodeObjectACL(ctx, bucketACL, reqInfo.BucketName, objInfo.VersionID())); err != nil {
+	if err = middleware.EncodeToResponse(w, h.encodeObjectACL(ctx, bucketACL, reqInfo.BucketName, objInfo.VersionID())); err != nil {
 		h.logAndSendError(w, "failed to encode response", reqInfo, err)
 	}
 }
 
 func (h *handler) PutObjectACLHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 	versionID := reqInfo.URL.Query().Get(api.QueryVersionID)
 	key, err := h.bearerTokenIssuerKey(ctx)
 	if err != nil {
@@ -476,7 +477,7 @@ func (h *handler) PutObjectACLHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *handler) GetBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -507,14 +508,14 @@ func checkOwner(info *data.BucketInfo, owner string) error {
 
 	// may need to convert owner to appropriate format
 	if info.Owner.String() != owner {
-		return errors.GetAPIError(errors.ErrAccessDenied)
+		return fmt.Errorf("%w: mismatch owner", errors.GetAPIError(errors.ErrAccessDenied))
 	}
 
 	return nil
 }
 
 func (h *handler) PutBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {

api/handler/acl_test.go

@@ -11,10 +11,13 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
@@ -1425,7 +1428,7 @@ func TestPutBucketPolicy(t *testing.T) {
 	createBucket(t, hc, bktName, box)
 
 	w, r := prepareTestPayloadRequest(hc, bktName, "", bytes.NewReader([]byte(bktPolicy)))
-	ctx := context.WithValue(r.Context(), api.BoxData, box)
+	ctx := context.WithValue(r.Context(), middleware.BoxData, box)
 	r = r.WithContext(ctx)
 	hc.Handler().PutBucketPolicyHandler(w, r)
 	assertStatus(hc.t, w, http.StatusOK)
@@ -1447,7 +1450,7 @@ func putBucketPolicy(hc *handlerContext, bktName string, bktPolicy *bucketPolicy
 	require.NoError(hc.t, err)
 
 	w, r := prepareTestPayloadRequest(hc, bktName, "", bytes.NewReader(body))
-	ctx := context.WithValue(r.Context(), api.BoxData, box)
+	ctx := context.WithValue(r.Context(), middleware.BoxData, box)
 	r = r.WithContext(ctx)
 	hc.Handler().PutBucketPolicyHandler(w, r)
 	assertStatus(hc.t, w, status)
@@ -1480,9 +1483,14 @@ func createAccessBox(t *testing.T) (*accessbox.Box, *keys.PrivateKey) {
 
 	tok := new(session.Container)
 	tok.ForVerb(session.VerbContainerSetEACL)
+	err = tok.Sign(key.PrivateKey)
+	require.NoError(t, err)
 
 	tok2 := new(session.Container)
 	tok2.ForVerb(session.VerbContainerPut)
+	err = tok2.Sign(key.PrivateKey)
+	require.NoError(t, err)
+
 	box := &accessbox.Box{
 		Gate: &accessbox.GateData{
 			SessionTokens: []*session.Container{tok, tok2},
@@ -1493,24 +1501,34 @@ func createAccessBox(t *testing.T) (*accessbox.Box, *keys.PrivateKey) {
 	return box, key
 }
 
-func createBucket(t *testing.T, tc *handlerContext, bktName string, box *accessbox.Box) *data.BucketInfo {
-	w, r := prepareTestRequest(tc, bktName, "", nil)
-	ctx := context.WithValue(r.Context(), api.BoxData, box)
-	r = r.WithContext(ctx)
-	tc.Handler().CreateBucketHandler(w, r)
+func createBucket(t *testing.T, hc *handlerContext, bktName string, box *accessbox.Box) *data.BucketInfo {
+	w := createBucketBase(hc, bktName, box)
 	assertStatus(t, w, http.StatusOK)
 
-	bktInfo, err := tc.Layer().GetBucketInfo(tc.Context(), bktName)
+	bktInfo, err := hc.Layer().GetBucketInfo(hc.Context(), bktName)
 	require.NoError(t, err)
 	return bktInfo
 }
 
+func createBucketAssertS3Error(hc *handlerContext, bktName string, box *accessbox.Box, code s3errors.ErrorCode) {
+	w := createBucketBase(hc, bktName, box)
+	assertS3Error(hc.t, w, s3errors.GetAPIError(code))
+}
+
+func createBucketBase(hc *handlerContext, bktName string, box *accessbox.Box) *httptest.ResponseRecorder {
+	w, r := prepareTestRequest(hc, bktName, "", nil)
+	ctx := context.WithValue(r.Context(), middleware.BoxData, box)
+	r = r.WithContext(ctx)
+	hc.Handler().CreateBucketHandler(w, r)
+	return w
+}
+
 func putBucketACL(t *testing.T, tc *handlerContext, bktName string, box *accessbox.Box, header map[string]string) {
 	w, r := prepareTestRequest(tc, bktName, "", nil)
 	for key, val := range header {
 		r.Header.Set(key, val)
 	}
-	ctx := context.WithValue(r.Context(), api.BoxData, box)
+	ctx := context.WithValue(r.Context(), middleware.BoxData, box)
 	r = r.WithContext(ctx)
 	tc.Handler().PutBucketACLHandler(w, r)
 	assertStatus(t, w, http.StatusOK)

api/handler/api.go

@@ -37,6 +37,7 @@ type (
 		ResolveZoneList            []string
 		IsResolveListAllow         bool // True if ResolveZoneList contains allowed zones
 		CompleteMultipartKeepalive time.Duration
+		Kludge                     KludgeSettings
 	}
 
 	PlacementPolicy interface {
@@ -49,6 +50,10 @@ type (
 	XMLDecoderProvider interface {
 		NewCompleteMultipartDecoder(io.Reader) *xml.Decoder
 	}
+
+	KludgeSettings interface {
+		BypassContentEncodingInChunks() bool
+	}
 )
 
 const (

api/handler/attributes.go

@@ -10,6 +10,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"go.uber.org/zap"
 )
 
@@ -67,7 +68,7 @@ var validAttributes = map[string]struct{}{
 }
 
 func (h *handler) GetObjectAttributesHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	params, err := parseGetObjectAttributeArgs(r)
 	if err != nil {
@@ -123,7 +124,7 @@ func (h *handler) GetObjectAttributesHandler(w http.ResponseWriter, r *http.Requ
 	}
 
 	writeAttributesHeaders(w.Header(), extendedInfo, bktSettings.Unversioned())
-	if err = api.EncodeToResponse(w, response); err != nil {
+	if err = middleware.EncodeToResponse(w, response); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }

api/handler/copy.go

@@ -11,6 +11,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"go.uber.org/zap"
 )
@@ -47,7 +48,7 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 		sessionTokenEACL *session.Container
 
 		ctx     = r.Context()
-		reqInfo = api.GetReqInfo(ctx)
+		reqInfo = middleware.GetReqInfo(ctx)
 
 		containsACL = containsACLHeaders(r)
 	)
@@ -105,6 +106,25 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	srcObjInfo := extendedSrcObjInfo.ObjectInfo
 
+	encryptionParams, err := formEncryptionParams(r)
+	if err != nil {
+		h.logAndSendError(w, "invalid sse headers", reqInfo, err)
+		return
+	}
+
+	if err = encryptionParams.MatchObjectEncryption(layer.FormEncryptionInfo(srcObjInfo.Headers)); err != nil {
+		h.logAndSendError(w, "encryption doesn't match object", reqInfo, errors.GetAPIError(errors.ErrBadRequest), zap.Error(err))
+		return
+	}
+
+	if srcSize, err := getObjectSize(extendedSrcObjInfo, encryptionParams); err != nil {
+		h.logAndSendError(w, "failed to get source object size", reqInfo, err)
+		return
+	} else if srcSize > layer.UploadMaxSize { //https://docs.aws.amazon.com/AmazonS3/latest/API/API_CopyObject.html
+		h.logAndSendError(w, "too bid object to copy with single copy operation, use multipart upload copy instead", reqInfo, errors.GetAPIError(errors.ErrInvalidRequestLargeCopy))
+		return
+	}
+
 	args, err := parseCopyObjectArgs(r.Header)
 	if err != nil {
 		h.logAndSendError(w, "could not parse request params", reqInfo, err)
@@ -143,17 +163,6 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	encryptionParams, err := formEncryptionParams(r)
-	if err != nil {
-		h.logAndSendError(w, "invalid sse headers", reqInfo, err)
-		return
-	}
-
-	if err = encryptionParams.MatchObjectEncryption(layer.FormEncryptionInfo(srcObjInfo.Headers)); err != nil {
-		h.logAndSendError(w, "encryption doesn't match object", reqInfo, errors.GetAPIError(errors.ErrBadRequest), zap.Error(err))
-		return
-	}
-
 	if err = checkPreconditions(srcObjInfo, args.Conditional); err != nil {
 		h.logAndSendError(w, "precondition failed", reqInfo, errors.GetAPIError(errors.ErrPreconditionFailed))
 		return
@@ -163,12 +172,14 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 		if len(srcObjInfo.ContentType) > 0 {
 			srcObjInfo.Headers[api.ContentType] = srcObjInfo.ContentType
 		}
-		metadata = srcObjInfo.Headers
+		metadata = makeCopyMap(srcObjInfo.Headers)
+		delete(metadata, layer.MultipartObjectSize) // object payload will be real one rather than list of compound parts
 	} else if contentType := r.Header.Get(api.ContentType); len(contentType) > 0 {
 		metadata[api.ContentType] = contentType
 	}
 
 	params := &layer.CopyObjectParams{
+		SrcVersioned: srcObjPrm.Versioned(),
 		SrcObject:    srcObjInfo,
 		ScrBktInfo:   srcObjPrm.BktInfo,
 		DstBktInfo:   dstBktInfo,
@@ -198,7 +209,7 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	dstObjInfo := extendedDstObjInfo.ObjectInfo
 
-	if err = api.EncodeToResponse(w, &CopyObjectResponse{LastModified: dstObjInfo.Created.UTC().Format(time.RFC3339), ETag: dstObjInfo.HashSum}); err != nil {
+	if err = middleware.EncodeToResponse(w, &CopyObjectResponse{LastModified: dstObjInfo.Created.UTC().Format(time.RFC3339), ETag: dstObjInfo.HashSum}); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err, additional...)
 		return
 	}
@@ -255,7 +266,15 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func isCopyingToItselfForbidden(reqInfo *api.ReqInfo, srcBucket string, srcObject string, settings *data.BucketSettings, args *copyObjectArgs) bool {
+func makeCopyMap(headers map[string]string) map[string]string {
+	res := make(map[string]string, len(headers))
+	for key, val := range headers {
+		res[key] = val
+	}
+	return res
+}
+
+func isCopyingToItselfForbidden(reqInfo *middleware.ReqInfo, srcBucket string, srcObject string, settings *data.BucketSettings, args *copyObjectArgs) bool {
 	if reqInfo.BucketName != srcBucket || reqInfo.ObjectName != srcObject {
 		return false
 	}

api/handler/copy_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"github.com/stretchr/testify/require"
 )
 
@@ -29,14 +30,14 @@ func TestCopyWithTaggingDirective(t *testing.T) {
 	copyMeta := CopyMeta{
 		Tags: map[string]string{"key2": "val"},
 	}
-	copyObject(t, tc, bktName, objName, objToCopy, copyMeta, http.StatusOK)
+	copyObject(tc, bktName, objName, objToCopy, copyMeta, http.StatusOK)
 	tagging := getObjectTagging(t, tc, bktName, objToCopy, emptyVersion)
 	require.Len(t, tagging.TagSet, 1)
 	require.Equal(t, "key", tagging.TagSet[0].Key)
 	require.Equal(t, "val", tagging.TagSet[0].Value)
 
 	copyMeta.TaggingDirective = replaceDirective
-	copyObject(t, tc, bktName, objName, objToCopy2, copyMeta, http.StatusOK)
+	copyObject(tc, bktName, objName, objToCopy2, copyMeta, http.StatusOK)
 	tagging = getObjectTagging(t, tc, bktName, objToCopy2, emptyVersion)
 	require.Len(t, tagging.TagSet, 1)
 	require.Equal(t, "key2", tagging.TagSet[0].Key)
@@ -51,20 +52,54 @@ func TestCopyToItself(t *testing.T) {
 
 	copyMeta := CopyMeta{MetadataDirective: replaceDirective}
 
-	copyObject(t, tc, bktName, objName, objName, CopyMeta{}, http.StatusBadRequest)
-	copyObject(t, tc, bktName, objName, objName, copyMeta, http.StatusOK)
+	copyObject(tc, bktName, objName, objName, CopyMeta{}, http.StatusBadRequest)
+	copyObject(tc, bktName, objName, objName, copyMeta, http.StatusOK)
 
 	putBucketVersioning(t, tc, bktName, true)
-	copyObject(t, tc, bktName, objName, objName, CopyMeta{}, http.StatusOK)
-	copyObject(t, tc, bktName, objName, objName, copyMeta, http.StatusOK)
+	copyObject(tc, bktName, objName, objName, CopyMeta{}, http.StatusOK)
+	copyObject(tc, bktName, objName, objName, copyMeta, http.StatusOK)
 
 	putBucketVersioning(t, tc, bktName, false)
-	copyObject(t, tc, bktName, objName, objName, CopyMeta{}, http.StatusOK)
-	copyObject(t, tc, bktName, objName, objName, copyMeta, http.StatusOK)
+	copyObject(tc, bktName, objName, objName, CopyMeta{}, http.StatusOK)
+	copyObject(tc, bktName, objName, objName, copyMeta, http.StatusOK)
 }
 
-func copyObject(t *testing.T, tc *handlerContext, bktName, fromObject, toObject string, copyMeta CopyMeta, statusCode int) {
-	w, r := prepareTestRequest(tc, bktName, toObject, nil)
+func TestCopyMultipart(t *testing.T) {
+	hc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-for-copy", "object-for-copy"
+	createTestBucket(hc, bktName)
+
+	partSize := layer.UploadMinSize
+	objLen := 6 * partSize
+	headers := map[string]string{}
+
+	data := multipartUpload(hc, bktName, objName, headers, objLen, partSize)
+	require.Equal(t, objLen, len(data))
+
+	objToCopy := "copy-target"
+	var copyMeta CopyMeta
+	copyObject(hc, bktName, objName, objToCopy, copyMeta, http.StatusOK)
+
+	copiedData, _ := getObject(hc, bktName, objToCopy)
+	equalDataSlices(t, data, copiedData)
+
+	result := getObjectAttributes(hc, bktName, objToCopy, objectParts)
+	require.NotNil(t, result.ObjectParts)
+
+	objToCopy2 := "copy-target2"
+	copyMeta.MetadataDirective = replaceDirective
+	copyObject(hc, bktName, objName, objToCopy2, copyMeta, http.StatusOK)
+
+	result = getObjectAttributes(hc, bktName, objToCopy2, objectParts)
+	require.Nil(t, result.ObjectParts)
+
+	copiedData, _ = getObject(hc, bktName, objToCopy2)
+	equalDataSlices(t, data, copiedData)
+}
+
+func copyObject(hc *handlerContext, bktName, fromObject, toObject string, copyMeta CopyMeta, statusCode int) {
+	w, r := prepareTestRequest(hc, bktName, toObject, nil)
 	r.Header.Set(api.AmzCopySource, bktName+"/"+fromObject)
 
 	r.Header.Set(api.AmzMetadataDirective, copyMeta.MetadataDirective)
@@ -79,8 +114,8 @@ func copyObject(t *testing.T, tc *handlerContext, bktName, fromObject, toObject
 	}
 	r.Header.Set(api.AmzTagging, tagsQuery.Encode())
 
-	tc.Handler().CopyObjectHandler(w, r)
-	assertStatus(t, w, statusCode)
+	hc.Handler().CopyObjectHandler(w, r)
+	assertStatus(hc.t, w, statusCode)
 }
 
 func putObjectTagging(t *testing.T, tc *handlerContext, bktName, objName string, tags map[string]string) {

api/handler/cors.go

@@ -8,6 +8,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"go.uber.org/zap"
 )
 
@@ -18,7 +19,7 @@ const (
 )
 
 func (h *handler) GetBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -32,14 +33,14 @@ func (h *handler) GetBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err = api.EncodeToResponse(w, cors); err != nil {
+	if err = middleware.EncodeToResponse(w, cors); err != nil {
 		h.logAndSendError(w, "could not encode cors to response", reqInfo, err)
 		return
 	}
 }
 
 func (h *handler) PutBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -63,11 +64,11 @@ func (h *handler) PutBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	api.WriteSuccessResponseHeadersOnly(w)
+	middleware.WriteSuccessResponseHeadersOnly(w)
 }
 
 func (h *handler) DeleteBucketCorsHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -92,7 +93,7 @@ func (h *handler) AppendCORSHeaders(w http.ResponseWriter, r *http.Request) {
 	}
 
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 	if reqInfo.BucketName == "" {
 		return
 	}
@@ -143,7 +144,7 @@ func (h *handler) AppendCORSHeaders(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *handler) Preflight(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
 	if err != nil {
 		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
@@ -197,7 +198,7 @@ func (h *handler) Preflight(w http.ResponseWriter, r *http.Request) {
 						if o != wildcard {
 							w.Header().Set(api.AccessControlAllowCredentials, "true")
 						}
-						api.WriteSuccessResponseHeadersOnly(w)
+						middleware.WriteSuccessResponseHeadersOnly(w)
 						return
 					}
 				}

api/handler/cors_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 )
 
 func TestCORSOriginWildcard(t *testing.T) {
@@ -23,14 +24,14 @@ func TestCORSOriginWildcard(t *testing.T) {
 	bktName := "bucket-for-cors"
 	box, _ := createAccessBox(t)
 	w, r := prepareTestRequest(hc, bktName, "", nil)
-	ctx := context.WithValue(r.Context(), api.BoxData, box)
+	ctx := context.WithValue(r.Context(), middleware.BoxData, box)
 	r = r.WithContext(ctx)
 	r.Header.Add(api.AmzACL, "public-read")
 	hc.Handler().CreateBucketHandler(w, r)
 	assertStatus(t, w, http.StatusOK)
 
 	w, r = prepareTestPayloadRequest(hc, bktName, "", strings.NewReader(body))
-	ctx = context.WithValue(r.Context(), api.BoxData, box)
+	ctx = context.WithValue(r.Context(), middleware.BoxData, box)
 	r = r.WithContext(ctx)
 	hc.Handler().PutBucketCorsHandler(w, r)
 	assertStatus(t, w, http.StatusOK)

api/handler/delete.go

@@ -10,6 +10,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
@@ -62,7 +63,7 @@ type DeleteObjectsResponse struct {
 
 func (h *handler) DeleteObjectHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 	versionID := reqInfo.URL.Query().Get(api.QueryVersionID)
 	versionedObject := []*layer.VersionedObject{{
 		Name:      reqInfo.ObjectName,
@@ -158,7 +159,7 @@ func isErrObjectLocked(err error) bool {
 // DeleteMultipleObjectsHandler handles multiple delete requests.
 func (h *handler) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 
 	// Content-Md5 is required and should be set
 	// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
@@ -264,14 +265,14 @@ func (h *handler) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Re
 		h.reqLogger(ctx).Error("couldn't delete objects", fields...)
 	}
 
-	if err = api.EncodeToResponse(w, response); err != nil {
+	if err = middleware.EncodeToResponse(w, response); err != nil {
 		h.logAndSendError(w, "could not write response", reqInfo, err, zap.Array("objects", marshaler))
 		return
 	}
 }
 
 func (h *handler) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
 		h.logAndSendError(w, "could not get bucket info", reqInfo, err)

api/handler/delete_test.go

@@ -3,11 +3,13 @@ package handler
 import (
 	"bytes"
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	apiErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/stretchr/testify/require"
@@ -25,11 +27,7 @@ func TestDeleteBucketOnAlreadyRemovedError(t *testing.T) {
 
 	putObject(t, hc, bktName, objName)
 
-	nodeVersion, err := hc.tree.GetUnversioned(hc.context, bktInfo, objName)
-	require.NoError(t, err)
-	var addr oid.Address
-	addr.SetContainer(bktInfo.CID)
-	addr.SetObject(nodeVersion.OID)
+	addr := getAddressOfLastVersion(hc, bktInfo, objName)
 	hc.tp.SetObjectError(addr, apistatus.ObjectAlreadyRemoved{})
 
 	deleteObjects(t, hc, bktName, [][2]string{{objName, emptyVersion}})
@@ -37,6 +35,15 @@ func TestDeleteBucketOnAlreadyRemovedError(t *testing.T) {
 	deleteBucket(t, hc, bktName, http.StatusNoContent)
 }
 
+func getAddressOfLastVersion(hc *handlerContext, bktInfo *data.BucketInfo, objName string) oid.Address {
+	nodeVersion, err := hc.tree.GetLatestVersion(hc.context, bktInfo, objName)
+	require.NoError(hc.t, err)
+	var addr oid.Address
+	addr.SetContainer(bktInfo.CID)
+	addr.SetObject(nodeVersion.OID)
+	return addr
+}
+
 func TestDeleteBucket(t *testing.T) {
 	tc := prepareHandlerContext(t)
 
@@ -425,22 +432,28 @@ func deleteBucket(t *testing.T, tc *handlerContext, bktName string, code int) {
 	assertStatus(t, w, code)
 }
 
-func checkNotFound(t *testing.T, tc *handlerContext, bktName, objName, version string) {
-	query := make(url.Values)
-	query.Add(api.QueryVersionID, version)
-
-	w, r := prepareTestFullRequest(tc, bktName, objName, query, nil)
-	tc.Handler().HeadObjectHandler(w, r)
+func checkNotFound(t *testing.T, hc *handlerContext, bktName, objName, version string) {
+	w := headObjectBase(hc, bktName, objName, version)
 	assertStatus(t, w, http.StatusNotFound)
 }
 
-func checkFound(t *testing.T, tc *handlerContext, bktName, objName, version string) {
+func headObjectAssertS3Error(hc *handlerContext, bktName, objName, version string, code apiErrors.ErrorCode) {
+	w := headObjectBase(hc, bktName, objName, version)
+	assertS3Error(hc.t, w, apiErrors.GetAPIError(code))
+}
+
+func checkFound(t *testing.T, hc *handlerContext, bktName, objName, version string) {
+	w := headObjectBase(hc, bktName, objName, version)
+	assertStatus(t, w, http.StatusOK)
+}
+
+func headObjectBase(hc *handlerContext, bktName, objName, version string) *httptest.ResponseRecorder {
 	query := make(url.Values)
 	query.Add(api.QueryVersionID, version)
 
-	w, r := prepareTestFullRequest(tc, bktName, objName, query, nil)
-	tc.Handler().HeadObjectHandler(w, r)
-	assertStatus(t, w, http.StatusOK)
+	w, r := prepareTestFullRequest(hc, bktName, objName, query, nil)
+	hc.Handler().HeadObjectHandler(w, r)
+	return w
 }
 
 func listVersions(t *testing.T, tc *handlerContext, bktName string) *ListObjectsVersionsResponse {

api/handler/encryption_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"strconv"
 	"strings"
@@ -41,7 +42,7 @@ func TestSimpleGetEncrypted(t *testing.T) {
 	require.NoError(t, err)
 	require.NotEqual(t, content, string(encryptedContent))
 
-	response, _ := getEncryptedObject(t, tc, bktName, objName)
+	response, _ := getEncryptedObject(tc, bktName, objName)
 	require.Equal(t, content, string(response))
 }
 
@@ -103,14 +104,40 @@ func TestS3EncryptionSSECMultipartUpload(t *testing.T) {
 	data := multipartUploadEncrypted(tc, bktName, objName, headers, objLen, partSize)
 	require.Equal(t, objLen, len(data))
 
-	resData, resHeader := getEncryptedObject(t, tc, bktName, objName)
+	resData, resHeader := getEncryptedObject(tc, bktName, objName)
 	equalDataSlices(t, data, resData)
 	require.Equal(t, headers[api.ContentType], resHeader.Get(api.ContentType))
 	require.Equal(t, headers[headerMetaKey], resHeader[headerMetaKey][0])
 	require.Equal(t, strconv.Itoa(objLen), resHeader.Get(api.ContentLength))
 
-	checkContentUsingRangeEnc(t, tc, bktName, objName, data, 1000000)
-	checkContentUsingRangeEnc(t, tc, bktName, objName, data, 10000000)
+	checkContentUsingRangeEnc(tc, bktName, objName, data, 1000000)
+	checkContentUsingRangeEnc(tc, bktName, objName, data, 10000000)
+}
+
+func TestMultipartUploadGetRange(t *testing.T) {
+	hc := prepareHandlerContext(t)
+	bktName, objName := "bucket-for-multipart-s3-tests", "multipart_obj"
+	createTestBucket(hc, bktName)
+
+	objLen := 30 * 1024 * 1024
+	partSize := objLen / 6
+	headerMetaKey := api.MetadataPrefix + "foo"
+	headers := map[string]string{
+		headerMetaKey:   "bar",
+		api.ContentType: "text/plain",
+	}
+
+	data := multipartUpload(hc, bktName, objName, headers, objLen, partSize)
+	require.Equal(t, objLen, len(data))
+
+	resData, resHeader := getObject(hc, bktName, objName)
+	equalDataSlices(t, data, resData)
+	require.Equal(t, headers[api.ContentType], resHeader.Get(api.ContentType))
+	require.Equal(t, headers[headerMetaKey], resHeader[headerMetaKey][0])
+	require.Equal(t, strconv.Itoa(objLen), resHeader.Get(api.ContentLength))
+
+	checkContentUsingRange(hc, bktName, objName, data, 1000000)
+	checkContentUsingRange(hc, bktName, objName, data, 10000000)
 }
 
 func equalDataSlices(t *testing.T, expected, actual []byte) {
@@ -127,7 +154,15 @@ func equalDataSlices(t *testing.T, expected, actual []byte) {
 	}
 }
 
-func checkContentUsingRangeEnc(t *testing.T, tc *handlerContext, bktName, objName string, data []byte, step int) {
+func checkContentUsingRangeEnc(hc *handlerContext, bktName, objName string, data []byte, step int) {
+	checkContentUsingRangeBase(hc, bktName, objName, data, step, true)
+}
+
+func checkContentUsingRange(hc *handlerContext, bktName, objName string, data []byte, step int) {
+	checkContentUsingRangeBase(hc, bktName, objName, data, step, false)
+}
+
+func checkContentUsingRangeBase(hc *handlerContext, bktName, objName string, data []byte, step int, encrypted bool) {
 	var off, toRead, end int
 
 	for off < len(data) {
@@ -137,8 +172,14 @@ func checkContentUsingRangeEnc(t *testing.T, tc *handlerContext, bktName, objNam
 		}
 		end = off + toRead - 1
 
-		rangeData := getEncryptedObjectRange(t, tc, bktName, objName, off, end)
-		equalDataSlices(t, data[off:end+1], rangeData)
+		var rangeData []byte
+		if encrypted {
+			rangeData = getEncryptedObjectRange(hc.t, hc, bktName, objName, off, end)
+		} else {
+			rangeData = getObjectRange(hc.t, hc, bktName, objName, off, end)
+		}
+
+		equalDataSlices(hc.t, data[off:end+1], rangeData)
 
 		off += step
 	}
@@ -168,6 +209,30 @@ func multipartUploadEncrypted(hc *handlerContext, bktName, objName string, heade
 	return
 }
 
+func multipartUpload(hc *handlerContext, bktName, objName string, headers map[string]string, objLen, partsSize int) (objData []byte) {
+	multipartInfo := createMultipartUpload(hc, bktName, objName, headers)
+
+	var sum, currentPart int
+	var etags []string
+	adjustedSize := partsSize
+
+	for sum < objLen {
+		currentPart++
+
+		sum += partsSize
+		if sum > objLen {
+			adjustedSize = objLen - sum
+		}
+
+		etag, data := uploadPart(hc, bktName, objName, multipartInfo.UploadID, currentPart, adjustedSize)
+		etags = append(etags, etag)
+		objData = append(objData, data...)
+	}
+
+	completeMultipartUpload(hc, bktName, objName, multipartInfo.UploadID, etags)
+	return
+}
+
 func createMultipartUploadEncrypted(hc *handlerContext, bktName, objName string, headers map[string]string) *InitiateMultipartUploadResponse {
 	return createMultipartUploadBase(hc, bktName, objName, true, headers)
 }
@@ -190,6 +255,11 @@ func createMultipartUploadBase(hc *handlerContext, bktName, objName string, encr
 }
 
 func completeMultipartUpload(hc *handlerContext, bktName, objName, uploadID string, partsETags []string) {
+	w := completeMultipartUploadBase(hc, bktName, objName, uploadID, partsETags)
+	assertStatus(hc.t, w, http.StatusOK)
+}
+
+func completeMultipartUploadBase(hc *handlerContext, bktName, objName, uploadID string, partsETags []string) *httptest.ResponseRecorder {
 	query := make(url.Values)
 	query.Set(uploadIDQuery, uploadID)
 	complete := &CompleteMultipartUpload{
@@ -204,7 +274,8 @@ func completeMultipartUpload(hc *handlerContext, bktName, objName, uploadID stri
 
 	w, r := prepareTestFullRequest(hc, bktName, objName, query, complete)
 	hc.Handler().CompleteMultipartUploadHandler(w, r)
-	assertStatus(hc.t, w, http.StatusOK)
+
+	return w
 }
 
 func uploadPartEncrypted(hc *handlerContext, bktName, objName, uploadID string, num, size int) (string, []byte) {
@@ -247,7 +318,7 @@ func TestMultipartEncrypted(t *testing.T) {
 	part2ETag, part2 := uploadPartEncrypted(hc, bktName, objName, multipartInitInfo.UploadID, 2, 5)
 	completeMultipartUpload(hc, bktName, objName, multipartInitInfo.UploadID, []string{part1ETag, part2ETag})
 
-	res, _ := getEncryptedObject(t, hc, bktName, objName)
+	res, _ := getEncryptedObject(hc, bktName, objName)
 	require.Equal(t, len(part1)+len(part2), len(res))
 	require.Equal(t, append(part1, part2...), res)
 
@@ -263,13 +334,22 @@ func putEncryptedObject(t *testing.T, tc *handlerContext, bktName, objName, cont
 	assertStatus(t, w, http.StatusOK)
 }
 
-func getEncryptedObject(t *testing.T, tc *handlerContext, bktName, objName string) ([]byte, http.Header) {
-	w, r := prepareTestRequest(tc, bktName, objName, nil)
+func getEncryptedObject(hc *handlerContext, bktName, objName string) ([]byte, http.Header) {
+	w, r := prepareTestRequest(hc, bktName, objName, nil)
 	setEncryptHeaders(r)
-	tc.Handler().GetObjectHandler(w, r)
-	assertStatus(t, w, http.StatusOK)
+	return getObjectBase(hc, w, r)
+}
+
+func getObject(hc *handlerContext, bktName, objName string) ([]byte, http.Header) {
+	w, r := prepareTestRequest(hc, bktName, objName, nil)
+	return getObjectBase(hc, w, r)
+}
+
+func getObjectBase(hc *handlerContext, w *httptest.ResponseRecorder, r *http.Request) ([]byte, http.Header) {
+	hc.Handler().GetObjectHandler(w, r)
+	assertStatus(hc.t, w, http.StatusOK)
 	content, err := io.ReadAll(w.Result().Body)
-	require.NoError(t, err)
+	require.NoError(hc.t, err)
 	return content, w.Header()
 }
 

api/handler/get.go

@@ -12,6 +12,8 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"go.uber.org/zap"
 )
 
@@ -87,6 +89,8 @@ func writeHeaders(h http.Header, requestHeader http.Header, extendedInfo *data.E
 	if len(info.Headers[layer.AttributeEncryptionAlgorithm]) > 0 {
 		h.Set(api.ContentLength, info.Headers[layer.AttributeDecryptedSize])
 		addSSECHeaders(h, requestHeader)
+	} else if len(info.Headers[layer.MultipartObjectSize]) > 0 {
+		h.Set(api.ContentLength, info.Headers[layer.MultipartObjectSize])
 	} else {
 		h.Set(api.ContentLength, strconv.FormatUint(info.Size, 10))
 	}
@@ -104,6 +108,9 @@ func writeHeaders(h http.Header, requestHeader http.Header, extendedInfo *data.E
 	if expires := info.Headers[api.Expires]; expires != "" {
 		h.Set(api.Expires, expires)
 	}
+	if encodings := info.Headers[api.ContentEncoding]; encodings != "" {
+		h.Set(api.ContentEncoding, encodings)
+	}
 
 	for key, val := range info.Headers {
 		if layer.IsSystemHeader(key) {
@@ -117,7 +124,7 @@ func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
 	var (
 		params *layer.RangeParams
 
-		reqInfo = api.GetReqInfo(r.Context())
+		reqInfo = middleware.GetReqInfo(r.Context())
 	)
 
 	conditional, err := parseConditionalHeaders(r.Header)
@@ -161,13 +168,11 @@ func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	fullSize := info.Size
-	if encryptionParams.Enabled() {
-		if fullSize, err = strconv.ParseUint(info.Headers[layer.AttributeDecryptedSize], 10, 64); err != nil {
-			h.logAndSendError(w, "invalid decrypted size header", reqInfo, errors.GetAPIError(errors.ErrBadRequest))
+	fullSize, err := getObjectSize(extendedInfo, encryptionParams)
+	if err != nil {
+		h.logAndSendError(w, "invalid size header", reqInfo, errors.GetAPIError(errors.ErrBadRequest))
 		return
 	}
-	}
 
 	if params, err = fetchRangeHeader(r.Header, fullSize); err != nil {
 		h.logAndSendError(w, "could not parse range header", reqInfo, err)
@@ -201,38 +206,70 @@ func (h *handler) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	writeHeaders(w.Header(), r.Header, extendedInfo, len(tagSet), bktSettings.Unversioned())
-	if params != nil {
-		writeRangeHeaders(w, params, info.Size)
-	} else {
-		w.WriteHeader(http.StatusOK)
-	}
-
-	getParams := &layer.GetObjectParams{
+	getPayloadParams := &layer.GetObjectParams{
 		ObjectInfo: info,
-		Writer:     w,
+		Versioned:  p.Versioned(),
 		Range:      params,
 		BucketInfo: bktInfo,
 		Encryption: encryptionParams,
 	}
-	if err = h.obj.GetObject(r.Context(), getParams); err != nil {
-		h.logAndSendError(w, "could not get object", reqInfo, err)
+
+	objPayload, err := h.obj.GetObject(r.Context(), getPayloadParams)
+	if err != nil {
+		h.logAndSendError(w, "could not get object payload", reqInfo, err)
+		return
 	}
+
+	writeHeaders(w.Header(), r.Header, extendedInfo, len(tagSet), bktSettings.Unversioned())
+	if params != nil {
+		writeRangeHeaders(w, params, fullSize)
+	} else {
+		w.WriteHeader(http.StatusOK)
+	}
+
+	if err = objPayload.StreamTo(w); err != nil {
+		h.logAndSendError(w, "could not stream object payload", reqInfo, err)
+		return
+	}
+}
+
+func getObjectSize(extendedInfo *data.ExtendedObjectInfo, encryptionParams encryption.Params) (uint64, error) {
+	var err error
+	fullSize := extendedInfo.ObjectInfo.Size
+
+	if encryptionParams.Enabled() {
+		if fullSize, err = strconv.ParseUint(extendedInfo.ObjectInfo.Headers[layer.AttributeDecryptedSize], 10, 64); err != nil {
+			return 0, fmt.Errorf("invalid decrypted size header: %w", err)
+		}
+	} else if extendedInfo.NodeVersion.IsCombined {
+		if fullSize, err = strconv.ParseUint(extendedInfo.ObjectInfo.Headers[layer.MultipartObjectSize], 10, 64); err != nil {
+			return 0, fmt.Errorf("invalid multipart size header: %w", err)
+		}
+	}
+
+	return fullSize, nil
 }
 
 func checkPreconditions(info *data.ObjectInfo, args *conditionalArgs) error {
 	if len(args.IfMatch) > 0 && args.IfMatch != info.HashSum {
-		return errors.GetAPIError(errors.ErrPreconditionFailed)
+		return fmt.Errorf("%w: etag mismatched: '%s', '%s'", errors.GetAPIError(errors.ErrPreconditionFailed), args.IfMatch, info.HashSum)
 	}
 	if len(args.IfNoneMatch) > 0 && args.IfNoneMatch == info.HashSum {
-		return errors.GetAPIError(errors.ErrNotModified)
+		return fmt.Errorf("%w: etag matched: '%s', '%s'", errors.GetAPIError(errors.ErrNotModified), args.IfNoneMatch, info.HashSum)
 	}
 	if args.IfModifiedSince != nil && info.Created.Before(*args.IfModifiedSince) {
-		return errors.GetAPIError(errors.ErrNotModified)
+		return fmt.Errorf("%w: not modified since '%s', last modified '%s'", errors.GetAPIError(errors.ErrNotModified),
+			args.IfModifiedSince.Format(time.RFC3339), info.Created.Format(time.RFC3339))
 	}
 	if args.IfUnmodifiedSince != nil && info.Created.After(*args.IfUnmodifiedSince) {
+		// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html#API_GetObject_RequestSyntax
+		// If both of the If-Match and If-Unmodified-Since headers are present in the request as follows:
+		// If-Match condition evaluates to true, and;
+		// If-Unmodified-Since condition evaluates to false;
+		// then, S3 returns 200 OK and the data requested.
 		if len(args.IfMatch) == 0 {
-			return errors.GetAPIError(errors.ErrPreconditionFailed)
+			return fmt.Errorf("%w: modified since '%s', last modified '%s'", errors.GetAPIError(errors.ErrPreconditionFailed),
+				args.IfUnmodifiedSince.Format(time.RFC3339), info.Created.Format(time.RFC3339))
 		}
 	}
 
@@ -242,8 +279,8 @@ func checkPreconditions(info *data.ObjectInfo, args *conditionalArgs) error {
 func parseConditionalHeaders(headers http.Header) (*conditionalArgs, error) {
 	var err error
 	args := &conditionalArgs{
-		IfMatch:     headers.Get(api.IfMatch),
-		IfNoneMatch: headers.Get(api.IfNoneMatch),
+		IfMatch:     strings.Trim(headers.Get(api.IfMatch), "\""),
+		IfNoneMatch: strings.Trim(headers.Get(api.IfNoneMatch), "\""),
 	}
 
 	if args.IfModifiedSince, err = parseHTTPTime(headers.Get(api.IfModifiedSince)); err != nil {

api/handler/get_test.go

@@ -2,15 +2,22 @@ package handler
 
 import (
 	"bytes"
+	stderrors "errors"
 	"fmt"
 	"io"
 	"net/http"
+	"net/http/httptest"
+	"net/url"
 	"testing"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	apiErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	"github.com/stretchr/testify/require"
 )
 
@@ -143,7 +150,11 @@ func TestPreconditions(t *testing.T) {
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			actual := checkPreconditions(tc.info, tc.args)
-			require.Equal(t, tc.expected, actual)
+			if tc.expected == nil {
+				require.NoError(t, actual)
+			} else {
+				require.True(t, stderrors.Is(actual, tc.expected), tc.expected, actual)
+			}
 		})
 	}
 }
@@ -170,6 +181,24 @@ func TestGetRange(t *testing.T) {
 	require.Equal(t, "bcdef", string(end))
 }
 
+func TestGetObject(t *testing.T) {
+	hc := prepareHandlerContext(t)
+	bktName, objName := "bucket", "obj"
+	bktInfo, objInfo := createVersionedBucketAndObject(hc.t, hc, bktName, objName)
+
+	putObject(hc.t, hc, bktName, objName)
+
+	checkFound(hc.t, hc, bktName, objName, objInfo.VersionID())
+	checkFound(hc.t, hc, bktName, objName, emptyVersion)
+
+	addr := getAddressOfLastVersion(hc, bktInfo, objName)
+	hc.tp.SetObjectError(addr, apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(objInfo.Address(), apistatus.ObjectNotFound{})
+
+	getObjectAssertS3Error(hc, bktName, objName, objInfo.VersionID(), s3errors.ErrNoSuchVersion)
+	getObjectAssertS3Error(hc, bktName, objName, emptyVersion, s3errors.ErrNoSuchKey)
+}
+
 func putObjectContent(hc *handlerContext, bktName, objName, content string) {
 	body := bytes.NewReader([]byte(content))
 	w, r := prepareTestPayloadRequest(hc, bktName, objName, body)
@@ -186,3 +215,17 @@ func getObjectRange(t *testing.T, tc *handlerContext, bktName, objName string, s
 	require.NoError(t, err)
 	return content
 }
+
+func getObjectAssertS3Error(hc *handlerContext, bktName, objName, version string, code apiErrors.ErrorCode) {
+	w := getObjectBaseResponse(hc, bktName, objName, version)
+	assertS3Error(hc.t, w, apiErrors.GetAPIError(code))
+}
+
+func getObjectBaseResponse(hc *handlerContext, bktName, objName, version string) *httptest.ResponseRecorder {
+	query := make(url.Values)
+	query.Add(api.QueryVersionID, version)
+
+	w, r := prepareTestFullRequest(hc, bktName, objName, query, nil)
+	hc.Handler().GetObjectHandler(w, r)
+	return w
+}

api/handler/handlers_test.go

@@ -13,11 +13,13 @@ import (
 	"testing"
 	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/resolver"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/pkg/service/tree"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/acl"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -35,6 +37,7 @@ type handlerContext struct {
 	tp      *layer.TestFrostFS
 	tree    *tree.Tree
 	context context.Context
+	kludge  *kludgeSettingsMock
 }
 
 func (hc *handlerContext) Handler() *handler {
@@ -82,12 +85,28 @@ func (p *xmlDecoderProviderMock) NewCompleteMultipartDecoder(r io.Reader) *xml.D
 	return xml.NewDecoder(r)
 }
 
+type kludgeSettingsMock struct {
+	bypassContentEncodingInChunks bool
+}
+
+func (k *kludgeSettingsMock) BypassContentEncodingInChunks() bool {
+	return k.bypassContentEncodingInChunks
+}
+
 func prepareHandlerContext(t *testing.T) *handlerContext {
+	return prepareHandlerContextBase(t, false)
+}
+
+func prepareHandlerContextWithMinCache(t *testing.T) *handlerContext {
+	return prepareHandlerContextBase(t, true)
+}
+
+func prepareHandlerContextBase(t *testing.T, minCache bool) *handlerContext {
 	key, err := keys.NewPrivateKey()
 	require.NoError(t, err)
 
 	l := zap.NewExample()
-	tp := layer.NewTestFrostFS()
+	tp := layer.NewTestFrostFS(key)
 
 	testResolver := &resolver.Resolver{Name: "test_resolver"}
 	testResolver.SetResolveFunc(func(_ context.Context, name string) (cid.ID, error) {
@@ -99,8 +118,13 @@ func prepareHandlerContext(t *testing.T) *handlerContext {
 
 	treeMock := NewTreeServiceMock(t)
 
+	cacheCfg := layer.DefaultCachesConfigs(l)
+	if minCache {
+		cacheCfg = getMinCacheConfig(l)
+	}
+
 	layerCfg := &layer.Config{
-		Caches:      layer.DefaultCachesConfigs(zap.NewExample()),
+		Caches:      cacheCfg,
 		AnonKey:     layer.AnonymousKey{Key: key},
 		Resolver:    testResolver,
 		TreeService: treeMock,
@@ -110,12 +134,15 @@ func prepareHandlerContext(t *testing.T) *handlerContext {
 	err = pp.DecodeString("REP 1")
 	require.NoError(t, err)
 
+	kludge := &kludgeSettingsMock{}
+
 	h := &handler{
 		log: l,
 		obj: layer.NewLayer(l, tp, layerCfg),
 		cfg: &Config{
 			Policy:     &placementPolicyMock{defaultPolicy: pp},
 			XMLDecoder: &xmlDecoderProviderMock{},
+			Kludge:     kludge,
 		},
 	}
 
@@ -125,7 +152,25 @@ func prepareHandlerContext(t *testing.T) *handlerContext {
 		h:       h,
 		tp:      tp,
 		tree:    treeMock,
-		context: context.WithValue(context.Background(), api.BoxData, newTestAccessBox(t, key)),
+		context: context.WithValue(context.Background(), middleware.BoxData, newTestAccessBox(t, key)),
+		kludge:  kludge,
+	}
+}
+
+func getMinCacheConfig(logger *zap.Logger) *layer.CachesConfig {
+	minCacheCfg := &cache.Config{
+		Size:     1,
+		Lifetime: 1,
+		Logger:   logger,
+	}
+	return &layer.CachesConfig{
+		Logger:        logger,
+		Objects:       minCacheCfg,
+		ObjectsList:   minCacheCfg,
+		Names:         minCacheCfg,
+		Buckets:       minCacheCfg,
+		System:        minCacheCfg,
+		AccessControl: minCacheCfg,
 	}
 }
 
@@ -139,6 +184,7 @@ func createTestBucket(hc *handlerContext, bktName string) *data.BucketInfo {
 	_, err := hc.MockedPool().CreateContainer(hc.Context(), layer.PrmContainerCreate{
 		Creator:  hc.owner,
 		Name:     bktName,
+		BasicACL: acl.PublicRWExtended,
 	})
 	require.NoError(hc.t, err)
 
@@ -215,8 +261,8 @@ func prepareTestRequestWithQuery(hc *handlerContext, bktName, objName string, qu
 	r := httptest.NewRequest(http.MethodPut, defaultURL, bytes.NewReader(body))
 	r.URL.RawQuery = query.Encode()
 
-	reqInfo := api.NewReqInfo(w, r, api.ObjectRequest{Bucket: bktName, Object: objName})
-	r = r.WithContext(api.SetReqInfo(hc.Context(), reqInfo))
+	reqInfo := middleware.NewReqInfo(w, r, middleware.ObjectRequest{Bucket: bktName, Object: objName})
+	r = r.WithContext(middleware.SetReqInfo(hc.Context(), reqInfo))
 
 	return w, r
 }
@@ -225,8 +271,8 @@ func prepareTestPayloadRequest(hc *handlerContext, bktName, objName string, payl
 	w := httptest.NewRecorder()
 	r := httptest.NewRequest(http.MethodPut, defaultURL, payload)
 
-	reqInfo := api.NewReqInfo(w, r, api.ObjectRequest{Bucket: bktName, Object: objName})
-	r = r.WithContext(api.SetReqInfo(hc.Context(), reqInfo))
+	reqInfo := middleware.NewReqInfo(w, r, middleware.ObjectRequest{Bucket: bktName, Object: objName})
+	r = r.WithContext(middleware.SetReqInfo(hc.Context(), reqInfo))
 
 	return w, r
 }
@@ -241,10 +287,16 @@ func existInMockedFrostFS(tc *handlerContext, bktInfo *data.BucketInfo, objInfo
 	p := &layer.GetObjectParams{
 		BucketInfo: bktInfo,
 		ObjectInfo: objInfo,
-		Writer:     io.Discard,
 	}
 
-	return tc.Layer().GetObject(tc.Context(), p) == nil
+	objPayload, err := tc.Layer().GetObject(tc.Context(), p)
+	if err != nil {
+		return false
+	}
+
+	_, err = io.ReadAll(objPayload)
+	require.NoError(tc.t, err)
+	return true
 }
 
 func listOIDsFromMockedFrostFS(t *testing.T, tc *handlerContext, bktName string) []oid.ID {

api/handler/head.go

@@ -1,13 +1,14 @@
 package handler
 
 import (
-	"bytes"
+	"io"
 	"net/http"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"go.uber.org/zap"
 )
 
@@ -26,7 +27,7 @@ func getRangeToDetectContentType(maxSize uint64) *layer.RangeParams {
 }
 
 func (h *handler) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -83,18 +84,26 @@ func (h *handler) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
 
 	if len(info.ContentType) == 0 {
 		if info.ContentType = layer.MimeByFilePath(info.Name); len(info.ContentType) == 0 {
-			buffer := bytes.NewBuffer(make([]byte, 0, sizeToDetectType))
 			getParams := &layer.GetObjectParams{
 				ObjectInfo: info,
-				Writer:     buffer,
+				Versioned:  p.Versioned(),
 				Range:      getRangeToDetectContentType(info.Size),
 				BucketInfo: bktInfo,
 			}
-			if err = h.obj.GetObject(r.Context(), getParams); err != nil {
+
+			objPayload, err := h.obj.GetObject(r.Context(), getParams)
+			if err != nil {
 				h.logAndSendError(w, "could not get object", reqInfo, err, zap.Stringer("oid", info.ID))
 				return
 			}
-			info.ContentType = http.DetectContentType(buffer.Bytes())
+
+			buffer, err := io.ReadAll(objPayload)
+			if err != nil {
+				h.logAndSendError(w, "could not partly read payload to detect content type", reqInfo, err, zap.Stringer("oid", info.ID))
+				return
+			}
+
+			info.ContentType = http.DetectContentType(buffer)
 		}
 	}
 
@@ -114,7 +123,7 @@ func (h *handler) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *handler) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -131,7 +140,7 @@ func (h *handler) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set(api.ContainerZone, bktInfo.Zone)
 	}
 
-	api.WriteResponse(w, http.StatusOK, nil, api.MimeNone)
+	middleware.WriteResponse(w, http.StatusOK, nil, middleware.MimeNone)
 }
 
 func (h *handler) setLockingHeaders(bktInfo *data.BucketInfo, lockInfo *data.LockInfo, header http.Header) error {

api/handler/head_test.go

@@ -7,8 +7,12 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/stretchr/testify/require"
@@ -24,10 +28,14 @@ func TestConditionalHead(t *testing.T) {
 	tc.Handler().HeadObjectHandler(w, r)
 	assertStatus(t, w, http.StatusOK)
 	etag := w.Result().Header.Get(api.ETag)
+	etagQuoted := "\"" + etag + "\""
 
 	headers := map[string]string{api.IfMatch: etag}
 	headObject(t, tc, bktName, objName, headers, http.StatusOK)
 
+	headers = map[string]string{api.IfMatch: etagQuoted}
+	headObject(t, tc, bktName, objName, headers, http.StatusOK)
+
 	headers = map[string]string{api.IfMatch: "etag"}
 	headObject(t, tc, bktName, objName, headers, http.StatusPreconditionFailed)
 
@@ -47,6 +55,9 @@ func TestConditionalHead(t *testing.T) {
 	headers = map[string]string{api.IfNoneMatch: etag}
 	headObject(t, tc, bktName, objName, headers, http.StatusNotModified)
 
+	headers = map[string]string{api.IfNoneMatch: etagQuoted}
+	headObject(t, tc, bktName, objName, headers, http.StatusNotModified)
+
 	headers = map[string]string{api.IfNoneMatch: "etag"}
 	headObject(t, tc, bktName, objName, headers, http.StatusOK)
 
@@ -75,17 +86,48 @@ func headObject(t *testing.T, tc *handlerContext, bktName, objName string, heade
 }
 
 func TestInvalidAccessThroughCache(t *testing.T) {
-	tc := prepareHandlerContext(t)
+	hc := prepareHandlerContext(t)
+
 	bktName, objName := "bucket-for-cache", "obj-for-cache"
-	createBucketAndObject(tc, bktName, objName)
+	bktInfo, _ := createBucketAndObject(hc, bktName, objName)
+	setContainerEACL(hc, bktInfo.CID)
 
-	headObject(t, tc, bktName, objName, nil, http.StatusOK)
+	headObject(t, hc, bktName, objName, nil, http.StatusOK)
 
-	w, r := prepareTestRequest(tc, bktName, objName, nil)
-	tc.Handler().HeadObjectHandler(w, r.WithContext(context.WithValue(r.Context(), api.BoxData, newTestAccessBox(t, nil))))
+	w, r := prepareTestRequest(hc, bktName, objName, nil)
+	hc.Handler().HeadObjectHandler(w, r.WithContext(context.WithValue(r.Context(), middleware.BoxData, newTestAccessBox(t, nil))))
 	assertStatus(t, w, http.StatusForbidden)
 }
 
+func setContainerEACL(hc *handlerContext, cnrID cid.ID) {
+	table := eacl.NewTable()
+	table.SetCID(cnrID)
+	for _, op := range fullOps {
+		table.AddRecord(getOthersRecord(op, eacl.ActionDeny))
+	}
+
+	err := hc.MockedPool().SetContainerEACL(hc.Context(), *table, nil)
+	require.NoError(hc.t, err)
+}
+
+func TestHeadObject(t *testing.T) {
+	hc := prepareHandlerContextWithMinCache(t)
+	bktName, objName := "bucket", "obj"
+	bktInfo, objInfo := createVersionedBucketAndObject(hc.t, hc, bktName, objName)
+
+	putObject(hc.t, hc, bktName, objName)
+
+	checkFound(hc.t, hc, bktName, objName, objInfo.VersionID())
+	checkFound(hc.t, hc, bktName, objName, emptyVersion)
+
+	addr := getAddressOfLastVersion(hc, bktInfo, objName)
+	hc.tp.SetObjectError(addr, apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(objInfo.Address(), apistatus.ObjectNotFound{})
+
+	headObjectAssertS3Error(hc, bktName, objName, objInfo.VersionID(), s3errors.ErrNoSuchVersion)
+	headObjectAssertS3Error(hc, bktName, objName, emptyVersion, s3errors.ErrNoSuchKey)
+}
+
 func TestIsAvailableToResolve(t *testing.T) {
 	list := []string{"container", "s3"}
 

api/handler/info.go

@@ -3,11 +3,11 @@ package handler
 import (
 	"net/http"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 )
 
 func (h *handler) GetBucketLocationHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -15,7 +15,7 @@ func (h *handler) GetBucketLocationHandler(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	if err = api.EncodeToResponse(w, LocationResponse{Location: bktInfo.LocationConstraint}); err != nil {
+	if err = middleware.EncodeToResponse(w, LocationResponse{Location: bktInfo.LocationConstraint}); err != nil {
 		h.logAndSendError(w, "couldn't encode bucket location response", reqInfo, err)
 	}
 }

api/handler/list.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
 )
 
@@ -15,7 +15,7 @@ func (h *handler) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
 	var (
 		own     user.ID
 		res     *ListBucketsResponse
-		reqInfo = api.GetReqInfo(r.Context())
+		reqInfo = middleware.GetReqInfo(r.Context())
 	)
 
 	list, err := h.obj.ListBuckets(r.Context())
@@ -42,7 +42,7 @@ func (h *handler) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
 		})
 	}
 
-	if err = api.EncodeToResponse(w, res); err != nil {
+	if err = middleware.EncodeToResponse(w, res); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }

api/handler/locking.go

@@ -12,6 +12,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	apiErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 )
 
 const (
@@ -26,7 +27,7 @@ const (
 )
 
 func (h *handler) PutBucketObjectLockConfigHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -73,7 +74,7 @@ func (h *handler) PutBucketObjectLockConfigHandler(w http.ResponseWriter, r *htt
 }
 
 func (h *handler) GetBucketObjectLockConfigHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -100,13 +101,13 @@ func (h *handler) GetBucketObjectLockConfigHandler(w http.ResponseWriter, r *htt
 		settings.LockConfiguration.ObjectLockEnabled = enabledValue
 	}
 
-	if err = api.EncodeToResponse(w, settings.LockConfiguration); err != nil {
+	if err = middleware.EncodeToResponse(w, settings.LockConfiguration); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
 
 func (h *handler) PutObjectLegalHoldHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -158,7 +159,7 @@ func (h *handler) PutObjectLegalHoldHandler(w http.ResponseWriter, r *http.Reque
 }
 
 func (h *handler) GetObjectLegalHoldHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -189,13 +190,13 @@ func (h *handler) GetObjectLegalHoldHandler(w http.ResponseWriter, r *http.Reque
 		legalHold.Status = legalHoldOn
 	}
 
-	if err = api.EncodeToResponse(w, legalHold); err != nil {
+	if err = middleware.EncodeToResponse(w, legalHold); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
 
 func (h *handler) PutObjectRetentionHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -242,7 +243,7 @@ func (h *handler) PutObjectRetentionHandler(w http.ResponseWriter, r *http.Reque
 }
 
 func (h *handler) GetObjectRetentionHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -281,7 +282,7 @@ func (h *handler) GetObjectRetentionHandler(w http.ResponseWriter, r *http.Reque
 		retention.Mode = complianceMode
 	}
 
-	if err = api.EncodeToResponse(w, retention); err != nil {
+	if err = middleware.EncodeToResponse(w, retention); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }

api/handler/locking_test.go

@@ -13,6 +13,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	apiErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"github.com/stretchr/testify/require"
 )
 
@@ -313,7 +314,7 @@ func TestPutBucketLockConfigurationHandler(t *testing.T) {
 
 			w := httptest.NewRecorder()
 			r := httptest.NewRequest(http.MethodPut, defaultURL, bytes.NewReader(body))
-			r = r.WithContext(api.SetReqInfo(r.Context(), api.NewReqInfo(w, r, api.ObjectRequest{Bucket: tc.bucket})))
+			r = r.WithContext(middleware.SetReqInfo(r.Context(), middleware.NewReqInfo(w, r, middleware.ObjectRequest{Bucket: tc.bucket})))
 
 			hc.Handler().PutBucketObjectLockConfigHandler(w, r)
 
@@ -386,7 +387,7 @@ func TestGetBucketLockConfigurationHandler(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			w := httptest.NewRecorder()
 			r := httptest.NewRequest(http.MethodPut, defaultURL, bytes.NewReader(nil))
-			r = r.WithContext(api.SetReqInfo(r.Context(), api.NewReqInfo(w, r, api.ObjectRequest{Bucket: tc.bucket})))
+			r = r.WithContext(middleware.SetReqInfo(r.Context(), middleware.NewReqInfo(w, r, middleware.ObjectRequest{Bucket: tc.bucket})))
 
 			hc.Handler().GetBucketObjectLockConfigHandler(w, r)
 
@@ -406,7 +407,7 @@ func TestGetBucketLockConfigurationHandler(t *testing.T) {
 }
 
 func assertS3Error(t *testing.T, w *httptest.ResponseRecorder, expectedError apiErrors.Error) {
-	actualErrorResponse := &api.ErrorResponse{}
+	actualErrorResponse := &middleware.ErrorResponse{}
 	err := xml.NewDecoder(w.Result().Body).Decode(actualErrorResponse)
 	require.NoError(t, err)
 

api/handler/multipart_upload.go

@@ -13,6 +13,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"github.com/google/uuid"
 	"go.uber.org/zap"
 )
@@ -94,7 +95,7 @@ const (
 )
 
 func (h *handler) CreateMultipartUploadHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -103,10 +104,7 @@ func (h *handler) CreateMultipartUploadHandler(w http.ResponseWriter, r *http.Re
 	}
 
 	uploadID := uuid.New()
-	additional := []zap.Field{
-		zap.String("uploadID", uploadID.String()),
-		zap.String("Key", reqInfo.ObjectName),
-	}
+	additional := []zap.Field{zap.String("uploadID", uploadID.String())}
 
 	p := &layer.CreateMultipartParams{
 		Info: &layer.UploadInfoParams{
@@ -120,11 +118,11 @@ func (h *handler) CreateMultipartUploadHandler(w http.ResponseWriter, r *http.Re
 	if containsACLHeaders(r) {
 		key, err := h.bearerTokenIssuerKey(r.Context())
 		if err != nil {
-			h.logAndSendError(w, "couldn't get gate key", reqInfo, err)
+			h.logAndSendError(w, "couldn't get gate key", reqInfo, err, additional...)
 			return
 		}
 		if _, err = parseACLHeaders(r.Header, key); err != nil {
-			h.logAndSendError(w, "could not parse acl", reqInfo, err)
+			h.logAndSendError(w, "could not parse acl", reqInfo, err, additional...)
 			return
 		}
 		p.Data.ACLHeaders = formACLHeadersForMultipart(r.Header)
@@ -140,7 +138,7 @@ func (h *handler) CreateMultipartUploadHandler(w http.ResponseWriter, r *http.Re
 
 	p.Info.Encryption, err = formEncryptionParams(r)
 	if err != nil {
-		h.logAndSendError(w, "invalid sse headers", reqInfo, err)
+		h.logAndSendError(w, "invalid sse headers", reqInfo, err, additional...)
 		return
 	}
 
@@ -151,7 +149,7 @@ func (h *handler) CreateMultipartUploadHandler(w http.ResponseWriter, r *http.Re
 
 	p.CopiesNumbers, err = h.pickCopiesNumbers(p.Header, bktInfo.LocationConstraint)
 	if err != nil {
-		h.logAndSendError(w, "invalid copies number", reqInfo, err)
+		h.logAndSendError(w, "invalid copies number", reqInfo, err, additional...)
 		return
 	}
 
@@ -170,7 +168,7 @@ func (h *handler) CreateMultipartUploadHandler(w http.ResponseWriter, r *http.Re
 		UploadID: uploadID.String(),
 	}
 
-	if err = api.EncodeToResponse(w, resp); err != nil {
+	if err = middleware.EncodeToResponse(w, resp); err != nil {
 		h.logAndSendError(w, "could not encode InitiateMultipartUploadResponse to response", reqInfo, err, additional...)
 		return
 	}
@@ -196,7 +194,7 @@ func formACLHeadersForMultipart(header http.Header) map[string]string {
 }
 
 func (h *handler) UploadPartHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -207,12 +205,19 @@ func (h *handler) UploadPartHandler(w http.ResponseWriter, r *http.Request) {
 	var (
 		queryValues = r.URL.Query()
 		uploadID    = queryValues.Get(uploadIDHeaderName)
-		additional  = []zap.Field{zap.String("uploadID", uploadID), zap.String("Key", reqInfo.ObjectName)}
+		partNumStr  = queryValues.Get(partNumberHeaderName)
+		additional  = []zap.Field{zap.String("uploadID", uploadID), zap.String("partNumber", partNumStr)}
 	)
 
-	partNumber, err := strconv.Atoi(queryValues.Get(partNumberHeaderName))
+	partNumber, err := strconv.Atoi(partNumStr)
 	if err != nil || partNumber < layer.UploadMinPartNumber || partNumber > layer.UploadMaxPartNumber {
-		h.logAndSendError(w, "invalid part number", reqInfo, errors.GetAPIError(errors.ErrInvalidPartNumber))
+		h.logAndSendError(w, "invalid part number", reqInfo, errors.GetAPIError(errors.ErrInvalidPartNumber), additional...)
+		return
+	}
+
+	body, err := h.getBodyReader(r)
+	if err != nil {
+		h.logAndSendError(w, "failed to get body reader", reqInfo, err, additional...)
 		return
 	}
 
@@ -229,12 +234,12 @@ func (h *handler) UploadPartHandler(w http.ResponseWriter, r *http.Request) {
 		},
 		PartNumber: partNumber,
 		Size:       size,
-		Reader:     r.Body,
+		Reader:     body,
 	}
 
 	p.Info.Encryption, err = formEncryptionParams(r)
 	if err != nil {
-		h.logAndSendError(w, "invalid sse headers", reqInfo, err)
+		h.logAndSendError(w, "invalid sse headers", reqInfo, err, additional...)
 		return
 	}
 
@@ -249,22 +254,23 @@ func (h *handler) UploadPartHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set(api.ETag, hash)
-	api.WriteSuccessResponseHeadersOnly(w)
+	middleware.WriteSuccessResponseHeadersOnly(w)
 }
 
 func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 	var (
 		versionID   string
 		ctx         = r.Context()
-		reqInfo     = api.GetReqInfo(ctx)
+		reqInfo     = middleware.GetReqInfo(ctx)
 		queryValues = reqInfo.URL.Query()
 		uploadID    = queryValues.Get(uploadIDHeaderName)
-		additional  = []zap.Field{zap.String("uploadID", uploadID), zap.String("Key", reqInfo.ObjectName)}
+		partNumStr  = queryValues.Get(partNumberHeaderName)
+		additional  = []zap.Field{zap.String("uploadID", uploadID), zap.String("partNumber", partNumStr)}
 	)
 
-	partNumber, err := strconv.Atoi(queryValues.Get(partNumberHeaderName))
+	partNumber, err := strconv.Atoi(partNumStr)
 	if err != nil || partNumber < layer.UploadMinPartNumber || partNumber > layer.UploadMaxPartNumber {
-		h.logAndSendError(w, "invalid part number", reqInfo, errors.GetAPIError(errors.ErrInvalidPartNumber))
+		h.logAndSendError(w, "invalid part number", reqInfo, errors.GetAPIError(errors.ErrInvalidPartNumber), additional...)
 		return
 	}
 
@@ -275,7 +281,7 @@ func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 	}
 	srcBucket, srcObject, err := path2BucketObject(src)
 	if err != nil {
-		h.logAndSendError(w, "invalid source copy", reqInfo, err)
+		h.logAndSendError(w, "invalid source copy", reqInfo, err, additional...)
 		return
 	}
 
@@ -288,21 +294,23 @@ func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 
 	srcBktInfo, err := h.getBucketAndCheckOwner(r, srcBucket, api.AmzSourceExpectedBucketOwner)
 	if err != nil {
-		h.logAndSendError(w, "could not get source bucket info", reqInfo, err)
+		h.logAndSendError(w, "could not get source bucket info", reqInfo, err, additional...)
 		return
 	}
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
-		h.logAndSendError(w, "could not get target bucket info", reqInfo, err)
+		h.logAndSendError(w, "could not get target bucket info", reqInfo, err, additional...)
 		return
 	}
 
-	srcInfo, err := h.obj.GetObjectInfo(ctx, &layer.HeadObjectParams{
+	headPrm := &layer.HeadObjectParams{
 		BktInfo:   srcBktInfo,
 		Object:    srcObject,
 		VersionID: versionID,
-	})
+	}
+
+	srcInfo, err := h.obj.GetObjectInfo(ctx, headPrm)
 	if err != nil {
 		if errors.IsS3Error(err, errors.ErrNoSuchKey) && versionID != "" {
 			h.logAndSendError(w, "could not head source object version", reqInfo,
@@ -327,6 +335,7 @@ func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 	}
 
 	p := &layer.UploadCopyParams{
+		Versioned: headPrm.Versioned(),
 		Info: &layer.UploadInfoParams{
 			UploadID: uploadID,
 			Bkt:      bktInfo,
@@ -340,12 +349,12 @@ func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 
 	p.Info.Encryption, err = formEncryptionParams(r)
 	if err != nil {
-		h.logAndSendError(w, "invalid sse headers", reqInfo, err)
+		h.logAndSendError(w, "invalid sse headers", reqInfo, err, additional...)
 		return
 	}
 
 	if err = p.Info.Encryption.MatchObjectEncryption(layer.FormEncryptionInfo(srcInfo.Headers)); err != nil {
-		h.logAndSendError(w, "encryption doesn't match object", reqInfo, errors.GetAPIError(errors.ErrBadRequest), zap.Error(err))
+		h.logAndSendError(w, "encryption doesn't match object", reqInfo, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrBadRequest), err), additional...)
 		return
 	}
 
@@ -364,13 +373,13 @@ func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 		addSSECHeaders(w.Header(), r.Header)
 	}
 
-	if err = api.EncodeToResponse(w, response); err != nil {
-		h.logAndSendError(w, "something went wrong", reqInfo, err)
+	if err = middleware.EncodeToResponse(w, response); err != nil {
+		h.logAndSendError(w, "something went wrong", reqInfo, err, additional...)
 	}
 }
 
 func (h *handler) CompleteMultipartUploadHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -385,7 +394,7 @@ func (h *handler) CompleteMultipartUploadHandler(w http.ResponseWriter, r *http.
 			Bkt:      bktInfo,
 			Key:      reqInfo.ObjectName,
 		}
-		additional = []zap.Field{zap.String("uploadID", uploadID), zap.String("Key", reqInfo.ObjectName)}
+		additional = []zap.Field{zap.String("uploadID", uploadID)}
 	)
 
 	reqBody := new(CompleteMultipartUpload)
@@ -417,11 +426,11 @@ func (h *handler) CompleteMultipartUploadHandler(w http.ResponseWriter, r *http.
 	// successfully or not.
 	headerIsWritten := stopPeriodicResponseWriter()
 
-	responseWriter := api.EncodeToResponse
+	responseWriter := middleware.EncodeToResponse
 	errLogger := h.logAndSendError
 	// Do not send XML and HTTP headers if periodic writer was invoked at this point.
 	if headerIsWritten {
-		responseWriter = api.EncodeToResponseNoHeader
+		responseWriter = middleware.EncodeToResponseNoHeader
 		errLogger = h.logAndSendErrorNoHeader
 	}
 
@@ -441,11 +450,11 @@ func (h *handler) CompleteMultipartUploadHandler(w http.ResponseWriter, r *http.
 	// space XML writer to keep connection with the client.
 
 	if err = responseWriter(w, response); err != nil {
-		errLogger(w, "something went wrong", reqInfo, err)
+		errLogger(w, "something went wrong", reqInfo, err, additional...)
 	}
 }
 
-func (h *handler) completeMultipartUpload(r *http.Request, c *layer.CompleteMultipartParams, bktInfo *data.BucketInfo, reqInfo *api.ReqInfo) (*data.ObjectInfo, error) {
+func (h *handler) completeMultipartUpload(r *http.Request, c *layer.CompleteMultipartParams, bktInfo *data.BucketInfo, reqInfo *middleware.ReqInfo) (*data.ObjectInfo, error) {
 	ctx := r.Context()
 	uploadData, extendedObjInfo, err := h.obj.CompleteMultipartUpload(ctx, c)
 	if err != nil {
@@ -509,7 +518,7 @@ func (h *handler) completeMultipartUpload(r *http.Request, c *layer.CompleteMult
 }
 
 func (h *handler) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -551,13 +560,13 @@ func (h *handler) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Req
 		return
 	}
 
-	if err = api.EncodeToResponse(w, encodeListMultipartUploadsToResponse(list, p)); err != nil {
+	if err = middleware.EncodeToResponse(w, encodeListMultipartUploadsToResponse(list, p)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
 
 func (h *handler) ListPartsHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -614,13 +623,13 @@ func (h *handler) ListPartsHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err = api.EncodeToResponse(w, encodeListPartsToResponse(list, p)); err != nil {
+	if err = middleware.EncodeToResponse(w, encodeListPartsToResponse(list, p)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
 
 func (h *handler) AbortMultipartUploadHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {

api/handler/multipart_upload_test.go

@@ -3,9 +3,12 @@ package handler
 import (
 	"bytes"
 	"encoding/xml"
+	"net/http"
+	"net/url"
 	"testing"
 	"time"
 
+	s3Errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"github.com/stretchr/testify/require"
 )
 
@@ -46,3 +49,78 @@ func TestPeriodicWriter(t *testing.T) {
 		})
 	})
 }
+
+func TestMultipartUploadInvalidPart(t *testing.T) {
+	hc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-to-upload-part", "object-multipart"
+	createTestBucket(hc, bktName)
+	partSize := 8 // less than min part size
+
+	multipartUpload := createMultipartUpload(hc, bktName, objName, map[string]string{})
+	etag1, _ := uploadPart(hc, bktName, objName, multipartUpload.UploadID, 1, partSize)
+	etag2, _ := uploadPart(hc, bktName, objName, multipartUpload.UploadID, 2, partSize)
+	w := completeMultipartUploadBase(hc, bktName, objName, multipartUpload.UploadID, []string{etag1, etag2})
+	assertS3Error(hc.t, w, s3Errors.GetAPIError(s3Errors.ErrEntityTooSmall))
+}
+
+func TestMultipartReUploadPart(t *testing.T) {
+	hc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-to-upload-part", "object-multipart"
+	bktInfo := createTestBucket(hc, bktName)
+	partSizeLast := 8 // less than min part size
+	partSizeFirst := 5 * 1024 * 1024
+
+	uploadInfo := createMultipartUpload(hc, bktName, objName, map[string]string{})
+	etag1, _ := uploadPart(hc, bktName, objName, uploadInfo.UploadID, 1, partSizeLast)
+	etag2, _ := uploadPart(hc, bktName, objName, uploadInfo.UploadID, 2, partSizeFirst)
+
+	list := listParts(hc, bktName, objName, uploadInfo.UploadID)
+	require.Len(t, list.Parts, 2)
+	require.Equal(t, etag1, list.Parts[0].ETag)
+	require.Equal(t, etag2, list.Parts[1].ETag)
+
+	w := completeMultipartUploadBase(hc, bktName, objName, uploadInfo.UploadID, []string{etag1, etag2})
+	assertS3Error(hc.t, w, s3Errors.GetAPIError(s3Errors.ErrEntityTooSmall))
+
+	etag1, data1 := uploadPart(hc, bktName, objName, uploadInfo.UploadID, 1, partSizeFirst)
+	etag2, data2 := uploadPart(hc, bktName, objName, uploadInfo.UploadID, 2, partSizeLast)
+
+	list = listParts(hc, bktName, objName, uploadInfo.UploadID)
+	require.Len(t, list.Parts, 2)
+	require.Equal(t, etag1, list.Parts[0].ETag)
+	require.Equal(t, etag2, list.Parts[1].ETag)
+
+	innerUploadInfo, err := hc.tree.GetMultipartUpload(hc.context, bktInfo, objName, uploadInfo.UploadID)
+	require.NoError(t, err)
+	treeParts, err := hc.tree.GetParts(hc.Context(), bktInfo, innerUploadInfo.ID)
+	require.NoError(t, err)
+	require.Len(t, treeParts, len(list.Parts))
+
+	w = completeMultipartUploadBase(hc, bktName, objName, uploadInfo.UploadID, []string{etag1, etag2})
+	assertStatus(hc.t, w, http.StatusOK)
+
+	data, _ := getObject(hc, bktName, objName)
+	equalDataSlices(t, append(data1, data2...), data)
+}
+
+func listParts(hc *handlerContext, bktName, objName string, uploadID string) *ListPartsResponse {
+	return listPartsBase(hc, bktName, objName, false, uploadID)
+}
+
+func listPartsBase(hc *handlerContext, bktName, objName string, encrypted bool, uploadID string) *ListPartsResponse {
+	query := make(url.Values)
+	query.Set(uploadIDQuery, uploadID)
+
+	w, r := prepareTestRequestWithQuery(hc, bktName, objName, query, nil)
+	if encrypted {
+		setEncryptHeaders(r)
+	}
+
+	hc.Handler().ListPartsHandler(w, r)
+	listPartsResponse := &ListPartsResponse{}
+	readResponse(hc.t, w, http.StatusOK, listPartsResponse)
+
+	return listPartsResponse
+}

api/handler/not_support.go

@@ -3,18 +3,18 @@ package handler
 import (
 	"net/http"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 )
 
 func (h *handler) DeleteBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not supported", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
+	h.logAndSendError(w, "not supported", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
 }
 
 func (h *handler) DeleteBucketLifecycleHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not supported", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
+	h.logAndSendError(w, "not supported", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
 }
 
 func (h *handler) DeleteBucketEncryptionHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not supported", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
+	h.logAndSendError(w, "not supported", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
 }

api/handler/notifications.go

@@ -8,10 +8,10 @@ import (
 	"strings"
 	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"github.com/google/uuid"
 )
@@ -21,7 +21,7 @@ type (
 		Event            string
 		NotificationInfo *data.NotificationInfo
 		BktInfo          *data.BucketInfo
-		ReqInfo          *api.ReqInfo
+		ReqInfo          *middleware.ReqInfo
 		User             string
 		Time             time.Time
 	}
@@ -96,7 +96,7 @@ var validEvents = map[string]struct{}{
 }
 
 func (h *handler) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
 		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
@@ -133,7 +133,7 @@ func (h *handler) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Re
 }
 
 func (h *handler) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -147,7 +147,7 @@ func (h *handler) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Re
 		return
 	}
 
-	if err = api.EncodeToResponse(w, conf); err != nil {
+	if err = middleware.EncodeToResponse(w, conf); err != nil {
 		h.logAndSendError(w, "could not encode bucket notification configuration to response", reqInfo, err)
 		return
 	}
@@ -179,7 +179,7 @@ func (h *handler) sendNotifications(ctx context.Context, p *SendNotificationPara
 }
 
 // checkBucketConfiguration checks notification configuration and generates an ID for configurations with empty ids.
-func (h *handler) checkBucketConfiguration(ctx context.Context, conf *data.NotificationConfiguration, r *api.ReqInfo) (completed bool, err error) {
+func (h *handler) checkBucketConfiguration(ctx context.Context, conf *data.NotificationConfiguration, r *middleware.ReqInfo) (completed bool, err error) {
 	if conf == nil {
 		return
 	}

api/handler/object_list.go

@@ -6,16 +6,16 @@ import (
 	"strconv"
 	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 )
 
 // ListObjectsV1Handler handles objects listing requests for API version 1.
 func (h *handler) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	params, err := parseListObjectsArgsV1(reqInfo)
 	if err != nil {
 		h.logAndSendError(w, "failed to parse arguments", reqInfo, err)
@@ -33,7 +33,7 @@ func (h *handler) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err = api.EncodeToResponse(w, encodeV1(params, list)); err != nil {
+	if err = middleware.EncodeToResponse(w, encodeV1(params, list)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
@@ -59,7 +59,7 @@ func encodeV1(p *layer.ListObjectsParamsV1, list *layer.ListObjectsInfoV1) *List
 
 // ListObjectsV2Handler handles objects listing requests for API version 2.
 func (h *handler) ListObjectsV2Handler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	params, err := parseListObjectsArgsV2(reqInfo)
 	if err != nil {
 		h.logAndSendError(w, "failed to parse arguments", reqInfo, err)
@@ -77,7 +77,7 @@ func (h *handler) ListObjectsV2Handler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err = api.EncodeToResponse(w, encodeV2(params, list)); err != nil {
+	if err = middleware.EncodeToResponse(w, encodeV2(params, list)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
@@ -103,7 +103,7 @@ func encodeV2(p *layer.ListObjectsParamsV2, list *layer.ListObjectsInfoV2) *List
 	return res
 }
 
-func parseListObjectsArgsV1(reqInfo *api.ReqInfo) (*layer.ListObjectsParamsV1, error) {
+func parseListObjectsArgsV1(reqInfo *middleware.ReqInfo) (*layer.ListObjectsParamsV1, error) {
 	var (
 		res         layer.ListObjectsParamsV1
 		queryValues = reqInfo.URL.Query()
@@ -120,7 +120,7 @@ func parseListObjectsArgsV1(reqInfo *api.ReqInfo) (*layer.ListObjectsParamsV1, e
 	return &res, nil
 }
 
-func parseListObjectsArgsV2(reqInfo *api.ReqInfo) (*layer.ListObjectsParamsV2, error) {
+func parseListObjectsArgsV2(reqInfo *middleware.ReqInfo) (*layer.ListObjectsParamsV2, error) {
 	var (
 		res         layer.ListObjectsParamsV2
 		queryValues = reqInfo.URL.Query()
@@ -142,7 +142,7 @@ func parseListObjectsArgsV2(reqInfo *api.ReqInfo) (*layer.ListObjectsParamsV2, e
 	return &res, nil
 }
 
-func parseListObjectArgs(reqInfo *api.ReqInfo) (*layer.ListObjectsParamsCommon, error) {
+func parseListObjectArgs(reqInfo *middleware.ReqInfo) (*layer.ListObjectsParamsCommon, error) {
 	var (
 		err         error
 		res         layer.ListObjectsParamsCommon
@@ -211,7 +211,7 @@ func fillContents(src []*data.ObjectInfo, encode string, fetchOwner bool) []Obje
 }
 
 func (h *handler) ListBucketObjectVersionsHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 	p, err := parseListObjectVersionsRequest(reqInfo)
 	if err != nil {
 		h.logAndSendError(w, "failed to parse request", reqInfo, err)
@@ -230,12 +230,12 @@ func (h *handler) ListBucketObjectVersionsHandler(w http.ResponseWriter, r *http
 	}
 
 	response := encodeListObjectVersionsToResponse(info, p.BktInfo.Name)
-	if err = api.EncodeToResponse(w, response); err != nil {
+	if err = middleware.EncodeToResponse(w, response); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
 
-func parseListObjectVersionsRequest(reqInfo *api.ReqInfo) (*layer.ListObjectVersionsParams, error) {
+func parseListObjectVersionsRequest(reqInfo *middleware.ReqInfo) (*layer.ListObjectVersionsParams, error) {
 	var (
 		err         error
 		res         layer.ListObjectVersionsParams

api/handler/put.go

@@ -22,6 +22,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
@@ -180,7 +181,7 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		sessionTokenEACL *session.Container
 		containsACL      = containsACLHeaders(r)
 		ctx              = r.Context()
-		reqInfo          = api.GetReqInfo(ctx)
+		reqInfo          = middleware.GetReqInfo(ctx)
 	)
 
 	if containsACL {
@@ -219,6 +220,15 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	body, err := h.getBodyReader(r)
+	if err != nil {
+		h.logAndSendError(w, "failed to get body reader", reqInfo, err)
+		return
+	}
+	if encodings := r.Header.Get(api.ContentEncoding); len(encodings) > 0 {
+		metadata[api.ContentEncoding] = encodings
+	}
+
 	var size uint64
 	if r.ContentLength > 0 {
 		size = uint64(r.ContentLength)
@@ -227,7 +237,7 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 	params := &layer.PutObjectParams{
 		BktInfo:    bktInfo,
 		Object:     reqInfo.ObjectName,
-		Reader:     r.Body,
+		Reader:     body,
 		Size:       size,
 		Header:     metadata,
 		Encryption: encryptionParams,
@@ -253,8 +263,8 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 
 	extendedObjInfo, err := h.obj.PutObject(ctx, params)
 	if err != nil {
-		_, err2 := io.Copy(io.Discard, r.Body)
-		err3 := r.Body.Close()
+		_, err2 := io.Copy(io.Discard, body)
+		err3 := body.Close()
 		h.logAndSendError(w, "could not upload object", reqInfo, err, zap.Errors("body close errors", []error{err2, err3}))
 		return
 	}
@@ -314,7 +324,49 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set(api.ETag, objInfo.HashSum)
-	api.WriteSuccessResponseHeadersOnly(w)
+	middleware.WriteSuccessResponseHeadersOnly(w)
+}
+
+func (h *handler) getBodyReader(r *http.Request) (io.ReadCloser, error) {
+	if !api.IsSignedStreamingV4(r) {
+		return r.Body, nil
+	}
+
+	encodings := r.Header.Values(api.ContentEncoding)
+	var chunkedEncoding bool
+	resultContentEncoding := make([]string, 0, len(encodings))
+	for _, enc := range encodings {
+		for _, e := range strings.Split(enc, ",") {
+			e = strings.TrimSpace(e)
+			if e == api.AwsChunked { // probably we should also check position of this header value
+				chunkedEncoding = true
+			} else {
+				resultContentEncoding = append(resultContentEncoding, e)
+			}
+		}
+	}
+	r.Header.Set(api.ContentEncoding, strings.Join(resultContentEncoding, ","))
+
+	if !chunkedEncoding && !h.cfg.Kludge.BypassContentEncodingInChunks() {
+		return nil, fmt.Errorf("%w: request is not chunk encoded, encodings '%s'",
+			errors.GetAPIError(errors.ErrInvalidEncodingMethod), strings.Join(encodings, ","))
+	}
+
+	decodeContentSize := r.Header.Get(api.AmzDecodedContentLength)
+	if len(decodeContentSize) == 0 {
+		return nil, errors.GetAPIError(errors.ErrMissingContentLength)
+	}
+
+	if _, err := strconv.Atoi(decodeContentSize); err != nil {
+		return nil, fmt.Errorf("%w: parse decoded content length: %s", errors.GetAPIError(errors.ErrMissingContentLength), err.Error())
+	}
+
+	chunkReader, err := newSignV4ChunkedReader(r)
+	if err != nil {
+		return nil, fmt.Errorf("initialize chunk reader: %w", err)
+	}
+
+	return chunkReader, nil
 }
 
 func formEncryptionParams(r *http.Request) (enc encryption.Params, err error) {
@@ -367,7 +419,7 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 		tagSet           map[string]string
 		sessionTokenEACL *session.Container
 		ctx              = r.Context()
-		reqInfo          = api.GetReqInfo(ctx)
+		reqInfo          = middleware.GetReqInfo(ctx)
 		metadata         = make(map[string]string)
 		containsACL      = containsACLHeaders(r)
 	)
@@ -509,7 +561,7 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 				ETag:   objInfo.HashSum,
 			}
 			w.WriteHeader(status)
-			if _, err = w.Write(api.EncodeResponse(resp)); err != nil {
+			if _, err = w.Write(middleware.EncodeResponse(resp)); err != nil {
 				h.logAndSendError(w, "something went wrong", reqInfo, err)
 			}
 			return
@@ -520,7 +572,7 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(status)
 }
 
-func checkPostPolicy(r *http.Request, reqInfo *api.ReqInfo, metadata map[string]string) (*postPolicy, error) {
+func checkPostPolicy(r *http.Request, reqInfo *middleware.ReqInfo, metadata map[string]string) (*postPolicy, error) {
 	policy := &postPolicy{empty: true}
 	if policyStr := auth.MultipartFormValue(r, "policy"); policyStr != "" {
 		policyData, err := base64.StdEncoding.DecodeString(policyStr)
@@ -660,7 +712,7 @@ func parseMetadata(r *http.Request) map[string]string {
 
 func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 	p := &layer.CreateBucketParams{
 		Name: reqInfo.BucketName,
 	}
@@ -740,7 +792,7 @@ func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	api.WriteSuccessResponseHeadersOnly(w)
+	middleware.WriteSuccessResponseHeadersOnly(w)
 }
 
 func (h handler) setPolicy(prm *layer.CreateBucketParams, locationConstraint string, userPolicies []*accessbox.ContainerPolicy) error {

api/handler/put_test.go

@@ -2,16 +2,28 @@ package handler
 
 import (
 	"bytes"
+	"context"
+	"crypto/rand"
 	"encoding/json"
+	"errors"
+	"io"
 	"mime/multipart"
 	"net/http"
+	"net/http/httptest"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
+	v4 "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
+	"github.com/aws/aws-sdk-go/aws/credentials"
 	"github.com/stretchr/testify/require"
 )
 
@@ -102,7 +114,7 @@ func TestEmptyPostPolicy(t *testing.T) {
 			},
 		},
 	}
-	reqInfo := &api.ReqInfo{}
+	reqInfo := &middleware.ReqInfo{}
 	metadata := make(map[string]string)
 
 	_, err := checkPostPolicy(r, reqInfo, metadata)
@@ -146,3 +158,154 @@ func TestPutObjectWithNegativeContentLength(t *testing.T) {
 	assertStatus(t, w, http.StatusOK)
 	require.Equal(t, strconv.Itoa(len(content)), w.Header().Get(api.ContentLength))
 }
+
+func TestPutObjectWithStreamBodyError(t *testing.T) {
+	tc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-for-put", "object-for-put"
+	createTestBucket(tc, bktName)
+
+	content := []byte("content")
+	w, r := prepareTestPayloadRequest(tc, bktName, objName, bytes.NewReader(content))
+	r.Header.Set(api.AmzContentSha256, api.StreamingContentSHA256)
+	r.Header.Set(api.ContentEncoding, api.AwsChunked)
+	tc.Handler().PutObjectHandler(w, r)
+	assertS3Error(t, w, s3errors.GetAPIError(s3errors.ErrMissingContentLength))
+
+	checkNotFound(t, tc, bktName, objName, emptyVersion)
+}
+
+func TestPutObjectWithWrapReaderDiscardOnError(t *testing.T) {
+	tc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-for-put", "object-for-put"
+	createTestBucket(tc, bktName)
+
+	content := make([]byte, 128*1024)
+	_, err := rand.Read(content)
+	require.NoError(t, err)
+
+	w, r := prepareTestPayloadRequest(tc, bktName, objName, bytes.NewReader(content))
+	tc.tp.SetObjectPutError(objName, errors.New("some error"))
+	numGoroutineBefore := runtime.NumGoroutine()
+	tc.Handler().PutObjectHandler(w, r)
+	numGoroutineAfter := runtime.NumGoroutine()
+	require.Equal(t, numGoroutineBefore, numGoroutineAfter, "goroutines shouldn't leak during put object")
+}
+
+func TestPutObjectWithStreamBodyAWSExample(t *testing.T) {
+	hc := prepareHandlerContext(t)
+
+	bktName, objName := "examplebucket", "chunkObject.txt"
+	createTestBucket(hc, bktName)
+
+	w, req, chunk := getChunkedRequest(hc.context, t, bktName, objName)
+	hc.Handler().PutObjectHandler(w, req)
+	assertStatus(t, w, http.StatusOK)
+
+	data := getObjectRange(t, hc, bktName, objName, 0, 66824)
+	for i := range chunk {
+		require.Equal(t, chunk[i], data[i])
+	}
+}
+
+func TestPutChunkedTestContentEncoding(t *testing.T) {
+	hc := prepareHandlerContext(t)
+
+	bktName, objName := "examplebucket", "chunkObject.txt"
+	createTestBucket(hc, bktName)
+
+	w, req, _ := getChunkedRequest(hc.context, t, bktName, objName)
+	req.Header.Set(api.ContentEncoding, api.AwsChunked+",gzip")
+
+	hc.Handler().PutObjectHandler(w, req)
+	assertStatus(t, w, http.StatusOK)
+
+	resp := headObjectBase(hc, bktName, objName, emptyVersion)
+	require.Equal(t, "gzip", resp.Header().Get(api.ContentEncoding))
+
+	w, req, _ = getChunkedRequest(hc.context, t, bktName, objName)
+	req.Header.Set(api.ContentEncoding, "gzip")
+	hc.Handler().PutObjectHandler(w, req)
+	assertS3Error(t, w, s3errors.GetAPIError(s3errors.ErrInvalidEncodingMethod))
+
+	hc.kludge.bypassContentEncodingInChunks = true
+	w, req, _ = getChunkedRequest(hc.context, t, bktName, objName)
+	req.Header.Set(api.ContentEncoding, "gzip")
+	hc.Handler().PutObjectHandler(w, req)
+	assertStatus(t, w, http.StatusOK)
+
+	resp = headObjectBase(hc, bktName, objName, emptyVersion)
+	require.Equal(t, "gzip", resp.Header().Get(api.ContentEncoding))
+}
+
+func getChunkedRequest(ctx context.Context, t *testing.T, bktName, objName string) (*httptest.ResponseRecorder, *http.Request, []byte) {
+	chunk := make([]byte, 65*1024)
+	for i := range chunk {
+		chunk[i] = 'a'
+	}
+	chunk1 := chunk[:64*1024]
+	chunk2 := chunk[64*1024:]
+
+	AWSAccessKeyID := "AKIAIOSFODNN7EXAMPLE"
+	AWSSecretAccessKey := "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
+
+	awsCreds := credentials.NewStaticCredentials(AWSAccessKeyID, AWSSecretAccessKey, "")
+	signer := v4.NewSigner(awsCreds)
+
+	reqBody := bytes.NewBufferString("10000;chunk-signature=ad80c730a21e5b8d04586a2213dd63b9a0e99e0e2307b0ade35a65485a288648\r\n")
+	_, err := reqBody.Write(chunk1)
+	require.NoError(t, err)
+	_, err = reqBody.WriteString("\r\n400;chunk-signature=0055627c9e194cb4542bae2aa5492e3c1575bbb81b612b7d234b86a503ef5497\r\n")
+	require.NoError(t, err)
+	_, err = reqBody.Write(chunk2)
+	require.NoError(t, err)
+	_, err = reqBody.WriteString("\r\n0;chunk-signature=b6c6ea8a5354eaf15b3cb7646744f4275b71ea724fed81ceb9323e279d449df9\r\n\r\n")
+	require.NoError(t, err)
+
+	req, err := http.NewRequest("PUT", "https://s3.amazonaws.com/"+bktName+"/"+objName, nil)
+	require.NoError(t, err)
+	req.Header.Set("content-encoding", "aws-chunked")
+	req.Header.Set("content-length", "66824")
+	req.Header.Set("x-amz-content-sha256", "STREAMING-AWS4-HMAC-SHA256-PAYLOAD")
+	req.Header.Set("x-amz-decoded-content-length", "66560")
+	req.Header.Set("x-amz-storage-class", "REDUCED_REDUNDANCY")
+
+	signTime, err := time.Parse("20060102T150405Z", "20130524T000000Z")
+	require.NoError(t, err)
+
+	_, err = signer.Sign(req, nil, "s3", "us-east-1", signTime)
+	require.NoError(t, err)
+
+	req.Body = io.NopCloser(reqBody)
+
+	w := httptest.NewRecorder()
+	reqInfo := middleware.NewReqInfo(w, req, middleware.ObjectRequest{Bucket: bktName, Object: objName})
+	req = req.WithContext(middleware.SetReqInfo(ctx, reqInfo))
+	req = req.WithContext(context.WithValue(req.Context(), middleware.ClientTime, signTime))
+	req = req.WithContext(context.WithValue(req.Context(), middleware.AuthHeaders, &auth.AuthHeader{
+		AccessKeyID: AWSAccessKeyID,
+		SignatureV4: "4f232c4386841ef735655705268965c44a0e4690baa4adea153f7db9fa80a0a9",
+		Service:     "s3",
+		Region:      "us-east-1",
+	}))
+	req = req.WithContext(context.WithValue(req.Context(), middleware.BoxData, &accessbox.Box{
+		Gate: &accessbox.GateData{
+			AccessKey: AWSSecretAccessKey,
+		},
+	}))
+
+	return w, req, chunk
+}
+
+func TestCreateBucket(t *testing.T) {
+	hc := prepareHandlerContext(t)
+	bktName := "bkt-name"
+
+	box, _ := createAccessBox(t)
+	createBucket(t, hc, bktName, box)
+	createBucketAssertS3Error(hc, bktName, box, s3errors.ErrBucketAlreadyOwnedByYou)
+
+	box2, _ := createAccessBox(t)
+	createBucketAssertS3Error(hc, bktName, box2, s3errors.ErrBucketAlreadyExists)
+}

api/handler/s3reader.go

@@ -0,0 +1,224 @@
+package handler
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/hex"
+	"errors"
+	"io"
+	"net/http"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
+	v4 "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4"
+	errs "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+)
+
+const (
+	chunkSignatureHeader = "chunk-signature="
+	maxChunkSize         = 16 << 20
+)
+
+type (
+	s3ChunkReader struct {
+		reader       *bufio.Reader
+		streamSigner *v4.StreamSigner
+
+		requestTime time.Time
+		buffer      []byte
+		offset      int
+		err         error
+	}
+)
+
+var (
+	errGiantChunk               = errors.New("chunk too big: choose chunk size <= 16MiB")
+	errMalformedChunkedEncoding = errors.New("malformed chunked encoding")
+)
+
+func (c *s3ChunkReader) Close() (err error) {
+	return nil
+}
+
+func (c *s3ChunkReader) Read(buf []byte) (num int, err error) {
+	if c.offset > 0 {
+		num = copy(buf, c.buffer[c.offset:])
+		if num == len(buf) {
+			c.offset += num
+			return num, nil
+		}
+		c.offset = 0
+		buf = buf[num:]
+	}
+
+	var size int
+	for {
+		b, err := c.reader.ReadByte()
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		if err != nil {
+			c.err = err
+			return num, c.err
+		}
+		if b == ';' { // separating character
+			break
+		}
+
+		// Manually deserialize the size since AWS specified
+		// the chunk size to be of variable width. In particular,
+		// a size of 16 is encoded as `10` while a size of 64 KB
+		// is `10000`.
+		switch {
+		case b >= '0' && b <= '9':
+			size = size<<4 | int(b-'0')
+		case b >= 'a' && b <= 'f':
+			size = size<<4 | int(b-('a'-10))
+		case b >= 'A' && b <= 'F':
+			size = size<<4 | int(b-('A'-10))
+		default:
+			c.err = errMalformedChunkedEncoding
+			return num, c.err
+		}
+		if size > maxChunkSize {
+			c.err = errGiantChunk
+			return num, c.err
+		}
+	}
+
+	// Now, we read the signature of the following payload and expect:
+	//   chunk-signature=" + <signature-as-hex> + "\r\n"
+	//
+	// The signature is 64 bytes long (hex-encoded SHA256 hash) and
+	// starts with a 16 byte header: len("chunk-signature=") + 64 == 80.
+	var signature [80]byte
+	_, err = io.ReadFull(c.reader, signature[:])
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	if err != nil {
+		c.err = err
+		return num, c.err
+	}
+	if !bytes.HasPrefix(signature[:], []byte(chunkSignatureHeader)) {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+	b, err := c.reader.ReadByte()
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	if err != nil {
+		c.err = err
+		return num, c.err
+	}
+	if b != '\r' {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+	b, err = c.reader.ReadByte()
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	if err != nil {
+		c.err = err
+		return num, c.err
+	}
+	if b != '\n' {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+
+	if cap(c.buffer) < size {
+		c.buffer = make([]byte, size)
+	} else {
+		c.buffer = c.buffer[:size]
+	}
+
+	// Now, we read the payload and compute its SHA-256 hash.
+	_, err = io.ReadFull(c.reader, c.buffer)
+	if err == io.EOF && size != 0 {
+		err = io.ErrUnexpectedEOF
+	}
+	if err != nil && err != io.EOF {
+		c.err = err
+		return num, c.err
+	}
+	b, err = c.reader.ReadByte()
+	if b != '\r' || err != nil {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+	b, err = c.reader.ReadByte()
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	if err != nil {
+		c.err = err
+		return num, c.err
+	}
+	if b != '\n' {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+
+	// Once we have read the entire chunk successfully, we verify
+	// that the received signature matches our computed signature.
+
+	calculatedSignature, err := c.streamSigner.GetSignature(nil, c.buffer, c.requestTime)
+	if err != nil {
+		c.err = err
+		return num, c.err
+	}
+	if string(signature[16:]) != hex.EncodeToString(calculatedSignature) {
+		c.err = errs.GetAPIError(errs.ErrSignatureDoesNotMatch)
+		return num, c.err
+	}
+
+	// If the chunk size is zero we return io.EOF. As specified by AWS,
+	// only the last chunk is zero-sized.
+	if size == 0 {
+		c.err = io.EOF
+		return num, c.err
+	}
+
+	c.offset = copy(buf, c.buffer)
+	num += c.offset
+	return num, err
+}
+
+func newSignV4ChunkedReader(req *http.Request) (io.ReadCloser, error) {
+	// Expecting to refactor this in future:
+	// https://git.frostfs.info/TrueCloudLab/frostfs-s3-gw/issues/137
+	box, ok := req.Context().Value(middleware.BoxData).(*accessbox.Box)
+	if !ok {
+		return nil, errs.GetAPIError(errs.ErrAuthorizationHeaderMalformed)
+	}
+
+	authHeaders, ok := req.Context().Value(middleware.AuthHeaders).(*auth.AuthHeader)
+	if !ok {
+		return nil, errs.GetAPIError(errs.ErrAuthorizationHeaderMalformed)
+	}
+
+	currentCredentials := credentials.NewStaticCredentials(authHeaders.AccessKeyID, box.Gate.AccessKey, "")
+	seed, err := hex.DecodeString(authHeaders.SignatureV4)
+	if err != nil {
+		return nil, errs.GetAPIError(errs.ErrSignatureDoesNotMatch)
+	}
+
+	reqTime, ok := req.Context().Value(middleware.ClientTime).(time.Time)
+	if !ok {
+		return nil, errs.GetAPIError(errs.ErrMalformedDate)
+	}
+	newStreamSigner := v4.NewStreamSigner(authHeaders.Region, "s3", seed, currentCredentials)
+
+	return &s3ChunkReader{
+		reader:       bufio.NewReader(req.Body),
+		streamSigner: newStreamSigner,
+		requestTime:  reqTime,
+		buffer:       make([]byte, 64*1024),
+	}, nil
+}

api/handler/tagging.go

@@ -12,6 +12,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"go.uber.org/zap"
 )
 
@@ -25,7 +26,7 @@ const (
 
 func (h *handler) PutObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 
 	tagSet, err := readTagSet(r.Body)
 	if err != nil {
@@ -72,7 +73,7 @@ func (h *handler) PutObjectTaggingHandler(w http.ResponseWriter, r *http.Request
 }
 
 func (h *handler) GetObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -103,14 +104,14 @@ func (h *handler) GetObjectTaggingHandler(w http.ResponseWriter, r *http.Request
 	if settings.VersioningEnabled() {
 		w.Header().Set(api.AmzVersionID, versionID)
 	}
-	if err = api.EncodeToResponse(w, encodeTagging(tagSet)); err != nil {
+	if err = middleware.EncodeToResponse(w, encodeTagging(tagSet)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }
 
 func (h *handler) DeleteObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	reqInfo := api.GetReqInfo(ctx)
+	reqInfo := middleware.GetReqInfo(ctx)
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -149,7 +150,7 @@ func (h *handler) DeleteObjectTaggingHandler(w http.ResponseWriter, r *http.Requ
 }
 
 func (h *handler) PutBucketTaggingHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	tagSet, err := readTagSet(r.Body)
 	if err != nil {
@@ -170,7 +171,7 @@ func (h *handler) PutBucketTaggingHandler(w http.ResponseWriter, r *http.Request
 }
 
 func (h *handler) GetBucketTaggingHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -184,14 +185,14 @@ func (h *handler) GetBucketTaggingHandler(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	if err = api.EncodeToResponse(w, encodeTagging(tagSet)); err != nil {
+	if err = middleware.EncodeToResponse(w, encodeTagging(tagSet)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 		return
 	}
 }
 
 func (h *handler) DeleteBucketTaggingHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {

api/handler/unimplemented.go

@@ -3,58 +3,58 @@ package handler
 import (
 	"net/http"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 )
 
 func (h *handler) SelectObjectContentHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketLifecycleHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketEncryptionHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketWebsiteHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketAccelerateHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketRequestPaymentHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketLoggingHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) GetBucketReplicationHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) DeleteBucketWebsiteHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) ListenBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) ListObjectsV2MHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) PutBucketLifecycleHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
 func (h *handler) PutBucketEncryptionHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
+	h.logAndSendError(w, "not implemented", middleware.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }

api/handler/util.go

@@ -2,29 +2,31 @@ package handler
 
 import (
 	"context"
-	errorsStd "errors"
+	"errors"
 	"net/http"
 	"strconv"
 	"strings"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	frosterrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"go.uber.org/zap"
 )
 
 func (h *handler) reqLogger(ctx context.Context) *zap.Logger {
-	reqLogger := api.GetReqLog(ctx)
+	reqLogger := middleware.GetReqLog(ctx)
 	if reqLogger != nil {
 		return reqLogger
 	}
 	return h.log
 }
 
-func (h *handler) logAndSendError(w http.ResponseWriter, logText string, reqInfo *api.ReqInfo, err error, additional ...zap.Field) {
-	code := api.WriteErrorResponse(w, reqInfo, transformToS3Error(err))
+func (h *handler) logAndSendError(w http.ResponseWriter, logText string, reqInfo *middleware.ReqInfo, err error, additional ...zap.Field) {
+	code := middleware.WriteErrorResponse(w, reqInfo, transformToS3Error(err))
 	fields := []zap.Field{
 		zap.Int("status", code),
 		zap.String("request_id", reqInfo.RequestID),
@@ -34,11 +36,11 @@ func (h *handler) logAndSendError(w http.ResponseWriter, logText string, reqInfo
 		zap.String("description", logText),
 		zap.Error(err)}
 	fields = append(fields, additional...)
-	h.log.Error("reqeust failed", fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
+	h.log.Error("request failed", fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
 }
 
-func (h *handler) logAndSendErrorNoHeader(w http.ResponseWriter, logText string, reqInfo *api.ReqInfo, err error, additional ...zap.Field) {
-	api.WriteErrorResponseNoHeader(w, reqInfo, transformToS3Error(err))
+func (h *handler) logAndSendErrorNoHeader(w http.ResponseWriter, logText string, reqInfo *middleware.ReqInfo, err error, additional ...zap.Field) {
+	middleware.WriteErrorResponseNoHeader(w, reqInfo, transformToS3Error(err))
 	fields := []zap.Field{
 		zap.String("request_id", reqInfo.RequestID),
 		zap.String("method", reqInfo.API),
@@ -47,24 +49,25 @@ func (h *handler) logAndSendErrorNoHeader(w http.ResponseWriter, logText string,
 		zap.String("description", logText),
 		zap.Error(err)}
 	fields = append(fields, additional...)
-	h.log.Error("reqeust failed", fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
+	h.log.Error("request failed", fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
 }
 
 func transformToS3Error(err error) error {
-	if _, ok := err.(errors.Error); ok {
+	err = frosterrors.UnwrapErr(err) // this wouldn't work with errors.Join
+	if _, ok := err.(s3errors.Error); ok {
 		return err
 	}
 
-	if errorsStd.Is(err, layer.ErrAccessDenied) ||
-		errorsStd.Is(err, layer.ErrNodeAccessDenied) {
-		return errors.GetAPIError(errors.ErrAccessDenied)
+	if errors.Is(err, layer.ErrAccessDenied) ||
+		errors.Is(err, layer.ErrNodeAccessDenied) {
+		return s3errors.GetAPIError(s3errors.ErrAccessDenied)
 	}
 
-	if errorsStd.Is(err, layer.ErrGatewayTimeout) {
-		return errors.GetAPIError(errors.ErrGatewayTimeout)
+	if errors.Is(err, layer.ErrGatewayTimeout) {
+		return s3errors.GetAPIError(s3errors.ErrGatewayTimeout)
 	}
 
-	return errors.GetAPIError(errors.ErrInternalError)
+	return s3errors.GetAPIError(s3errors.ErrInternalError)
 }
 
 func (h *handler) ResolveBucket(ctx context.Context, bucket string) (*data.BucketInfo, error) {
@@ -99,26 +102,26 @@ func parseRange(s string) (*layer.RangeParams, error) {
 	prefix := "bytes="
 
 	if !strings.HasPrefix(s, prefix) {
-		return nil, errors.GetAPIError(errors.ErrInvalidRange)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidRange)
 	}
 
 	s = strings.TrimPrefix(s, prefix)
 
 	valuesStr := strings.Split(s, "-")
 	if len(valuesStr) != 2 {
-		return nil, errors.GetAPIError(errors.ErrInvalidRange)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidRange)
 	}
 
 	values := make([]uint64, 0, len(valuesStr))
 	for _, v := range valuesStr {
 		num, err := strconv.ParseUint(v, 10, 64)
 		if err != nil {
-			return nil, errors.GetAPIError(errors.ErrInvalidRange)
+			return nil, s3errors.GetAPIError(s3errors.ErrInvalidRange)
 		}
 		values = append(values, num)
 	}
 	if values[0] > values[1] {
-		return nil, errors.GetAPIError(errors.ErrInvalidRange)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidRange)
 	}
 
 	return &layer.RangeParams{
@@ -134,7 +137,7 @@ func getSessionTokenSetEACL(ctx context.Context) (*session.Container, error) {
 	}
 	sessionToken := boxData.Gate.SessionTokenForSetEACL()
 	if sessionToken == nil {
-		return nil, errors.GetAPIError(errors.ErrAccessDenied)
+		return nil, s3errors.GetAPIError(s3errors.ErrAccessDenied)
 	}
 
 	return sessionToken, nil

api/handler/util_test.go

@@ -0,0 +1,64 @@
+package handler
+
+import (
+	"errors"
+	"fmt"
+	"testing"
+
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"github.com/stretchr/testify/require"
+)
+
+func TestTransformS3Errors(t *testing.T) {
+	for _, tc := range []struct {
+		name     string
+		err      error
+		expected s3errors.ErrorCode
+	}{
+		{
+			name:     "simple std error to internal error",
+			err:      errors.New("some error"),
+			expected: s3errors.ErrInternalError,
+		},
+		{
+			name:     "layer access denied error to s3 access denied error",
+			err:      layer.ErrAccessDenied,
+			expected: s3errors.ErrAccessDenied,
+		},
+		{
+			name:     "wrapped layer access denied error to s3 access denied error",
+			err:      fmt.Errorf("wrap: %w", layer.ErrAccessDenied),
+			expected: s3errors.ErrAccessDenied,
+		},
+		{
+			name:     "layer node access denied error to s3 access denied error",
+			err:      layer.ErrNodeAccessDenied,
+			expected: s3errors.ErrAccessDenied,
+		},
+		{
+			name:     "layer gateway timeout error to s3 gateway timeout error",
+			err:      layer.ErrGatewayTimeout,
+			expected: s3errors.ErrGatewayTimeout,
+		},
+		{
+			name:     "s3 error to s3 error",
+			err:      s3errors.GetAPIError(s3errors.ErrInvalidPart),
+			expected: s3errors.ErrInvalidPart,
+		},
+		{
+			name:     "wrapped s3 error to s3 error",
+			err:      fmt.Errorf("wrap: %w", s3errors.GetAPIError(s3errors.ErrInvalidPart)),
+			expected: s3errors.ErrInvalidPart,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			err := transformToS3Error(tc.err)
+			s3err, ok := err.(s3errors.Error)
+			require.True(t, ok, "error must be s3 error")
+			require.Equalf(t, tc.expected, s3err.ErrCode,
+				"expected: '%s', got: '%s'",
+				s3errors.GetAPIError(tc.expected).Code, s3errors.GetAPIError(s3err.ErrCode).Code)
+		})
+	}
+}

api/handler/versioning.go

@@ -4,14 +4,14 @@ import (
 	"encoding/xml"
 	"net/http"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 )
 
 func (h *handler) PutBucketVersioningHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	configuration := new(VersioningConfiguration)
 	if err := xml.NewDecoder(r.Body).Decode(configuration); err != nil {
@@ -57,7 +57,7 @@ func (h *handler) PutBucketVersioningHandler(w http.ResponseWriter, r *http.Requ
 
 // GetBucketVersioningHandler implements bucket versioning getter handler.
 func (h *handler) GetBucketVersioningHandler(w http.ResponseWriter, r *http.Request) {
-	reqInfo := api.GetReqInfo(r.Context())
+	reqInfo := middleware.GetReqInfo(r.Context())
 
 	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
 	if err != nil {
@@ -71,7 +71,7 @@ func (h *handler) GetBucketVersioningHandler(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
-	if err = api.EncodeToResponse(w, formVersioningConfiguration(settings)); err != nil {
+	if err = middleware.EncodeToResponse(w, formVersioningConfiguration(settings)); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err)
 	}
 }

api/headers.go

@@ -1,5 +1,7 @@
 package api
 
+import "net/http"
+
 // Standard S3 HTTP request/response constants.
 const (
 	MetadataPrefix              = "X-Amz-Meta-"
@@ -39,11 +41,13 @@ const (
 	IfMatch            = "If-Match"
 	IfNoneMatch        = "If-None-Match"
 
+	AmzContentSha256             = "X-Amz-Content-Sha256"
 	AmzCopyIfModifiedSince       = "X-Amz-Copy-Source-If-Modified-Since"
 	AmzCopyIfUnmodifiedSince     = "X-Amz-Copy-Source-If-Unmodified-Since"
 	AmzCopyIfMatch               = "X-Amz-Copy-Source-If-Match"
 	AmzCopyIfNoneMatch           = "X-Amz-Copy-Source-If-None-Match"
 	AmzACL                       = "X-Amz-Acl"
+	AmzDecodedContentLength      = "X-Amz-Decoded-Content-Length"
 	AmzGrantFullControl          = "X-Amz-Grant-Full-Control"
 	AmzGrantRead                 = "X-Amz-Grant-Read"
 	AmzGrantWrite                = "X-Amz-Grant-Write"
@@ -78,9 +82,13 @@ const (
 	AccessControlRequestMethod  = "Access-Control-Request-Method"
 	AccessControlRequestHeaders = "Access-Control-Request-Headers"
 
+	AwsChunked = "aws-chunked"
+
 	Vary = "Vary"
 
 	DefaultLocationConstraint = "default"
+
+	StreamingContentSHA256 = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD"
 )
 
 // S3 request query params.
@@ -107,3 +115,8 @@ var SystemMetadata = map[string]struct{}{
 	LastModified:       {},
 	ETag:               {},
 }
+
+func IsSignedStreamingV4(r *http.Request) bool {
+	return r.Header.Get(AmzContentSha256) == StreamingContentSHA256 &&
+		r.Method == http.MethodPut
+}

api/host_bucket_router.go

@@ -0,0 +1,71 @@
+package api
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/go-chi/chi/v5"
+)
+
+type HostBucketRouter struct {
+	routes        map[string]chi.Router
+	bktParam      string
+	defaultRouter chi.Router
+}
+
+func NewHostBucketRouter(bktParam string) HostBucketRouter {
+	return HostBucketRouter{
+		routes:   make(map[string]chi.Router),
+		bktParam: bktParam,
+	}
+}
+
+func (hr *HostBucketRouter) Default(router chi.Router) {
+	hr.defaultRouter = router
+}
+
+func (hr HostBucketRouter) Map(host string, h chi.Router) {
+	hr.routes[strings.ToLower(host)] = h
+}
+
+func (hr HostBucketRouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	bucket, domain := getBucketDomain(getHost(r))
+	router, ok := hr.routes[strings.ToLower(domain)]
+	if !ok {
+		router = hr.defaultRouter
+		if router == nil {
+			http.Error(w, http.StatusText(404), 404)
+			return
+		}
+	}
+
+	if rctx := chi.RouteContext(r.Context()); rctx != nil && bucket != "" {
+		rctx.URLParams.Add(hr.bktParam, bucket)
+	}
+
+	router.ServeHTTP(w, r)
+}
+
+func getBucketDomain(host string) (bucket string, domain string) {
+	parts := strings.Split(host, ".")
+	if len(parts) > 1 {
+		return parts[0], strings.Join(parts[1:], ".")
+	}
+	return "", host
+}
+
+// getHost tries its best to return the request host.
+// According to section 14.23 of RFC 2616 the Host header
+// can include the port number if the default value of 80 is not used.
+func getHost(r *http.Request) string {
+	host := r.Host
+	if r.URL.IsAbs() {
+		host = r.URL.Host
+	}
+
+	if i := strings.Index(host, ":"); i != -1 {
+		host = host[:i]
+	}
+
+	return host
+}

api/layer/compound.go

@@ -2,15 +2,16 @@ package layer
 
 import (
 	"context"
-	errorsStd "errors"
+	"errors"
+	"fmt"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 )
 
 func (n *layer) GetObjectTaggingAndLock(ctx context.Context, objVersion *ObjectVersion, nodeVersion *data.NodeVersion) (map[string]string, *data.LockInfo, error) {
 	var err error
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 
 	tags := n.cache.GetTagging(owner, objectTaggingCacheKey(objVersion))
 	lockInfo := n.cache.GetLockInfo(owner, lockObjectKey(objVersion))
@@ -28,8 +29,8 @@ func (n *layer) GetObjectTaggingAndLock(ctx context.Context, objVersion *ObjectV
 
 	tags, lockInfo, err = n.treeService.GetObjectTaggingAndLock(ctx, objVersion.BktInfo, nodeVersion)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return nil, nil, err
 	}

api/layer/container.go

@@ -8,7 +8,7 @@ import (
 	v2container "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
@@ -43,10 +43,8 @@ func (n *layer) containerInfo(ctx context.Context, idCnr cid.ID) (*data.BucketIn
 	)
 	res, err = n.frostFS.Container(ctx, idCnr)
 	if err != nil {
-		log.Error("could not fetch container", zap.Error(err))
-
 		if client.IsErrContainerNotFound(err) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchBucket)
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchBucket), err.Error())
 		}
 		return nil, fmt.Errorf("get frostfs container: %w", err)
 	}
@@ -78,12 +76,7 @@ func (n *layer) containerInfo(ctx context.Context, idCnr cid.ID) (*data.BucketIn
 }
 
 func (n *layer) containerList(ctx context.Context) ([]*data.BucketInfo, error) {
-	var (
-		err error
-		own = n.Owner(ctx)
-		res []cid.ID
-	)
-	res, err = n.frostFS.UserContainers(ctx, own)
+	res, err := n.frostFS.UserContainers(ctx, n.BearerOwner(ctx))
 	if err != nil {
 		n.reqLogger(ctx).Error("could not list user containers", zap.Error(err))
 		return nil, err
@@ -104,14 +97,13 @@ func (n *layer) containerList(ctx context.Context) ([]*data.BucketInfo, error) {
 }
 
 func (n *layer) createContainer(ctx context.Context, p *CreateBucketParams) (*data.BucketInfo, error) {
-	ownerID := n.Owner(ctx)
 	if p.LocationConstraint == "" {
 		p.LocationConstraint = api.DefaultLocationConstraint // s3tests_boto3.functional.test_s3:test_bucket_get_location
 	}
 	bktInfo := &data.BucketInfo{
 		Name:               p.Name,
 		Zone:               v2container.SysAttributeZoneDefault,
-		Owner:              ownerID,
+		Owner:              n.BearerOwner(ctx),
 		Created:            TimeNow(ctx),
 		LocationConstraint: p.LocationConstraint,
 		ObjectLockEnabled:  p.ObjectLockEnabled,

api/layer/cors.go

@@ -38,7 +38,6 @@ func (n *layer) PutBucketCORS(ctx context.Context, p *PutCORSParams) error {
 
 	prm := PrmObjectCreate{
 		Container:    p.BktInfo.CID,
-		Creator:      p.BktInfo.Owner,
 		Payload:      &buf,
 		Filepath:     p.BktInfo.CORSObjectName(),
 		CreationTime: TimeNow(ctx),
@@ -64,7 +63,7 @@ func (n *layer) PutBucketCORS(ctx context.Context, p *PutCORSParams) error {
 		}
 	}
 
-	n.cache.PutCORS(n.Owner(ctx), p.BktInfo, cors)
+	n.cache.PutCORS(n.BearerOwner(ctx), p.BktInfo, cors)
 
 	return nil
 }
@@ -73,7 +72,7 @@ func (n *layer) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (*d
 	cors, err := n.getCORS(ctx, bktInfo)
 	if err != nil {
 		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchCORSConfiguration)
+			return nil, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchCORSConfiguration), err.Error())
 		}
 		return nil, err
 	}

api/layer/frostfs.go

@@ -91,9 +91,6 @@ type PrmObjectCreate struct {
 	// Container to store the object.
 	Container cid.ID
 
-	// FrostFS identifier of the object creator.
-	Creator user.ID
-
 	// Key-value object attributes.
 	Attributes [][2]string
 

api/layer/frostfs_mock.go

@@ -11,7 +11,7 @@ import (
 	"time"
 
 	objectv2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
@@ -23,6 +23,7 @@ import (
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 type TestFrostFS struct {
@@ -30,17 +31,21 @@ type TestFrostFS struct {
 
 	objects         map[string]*object.Object
 	objectErrors    map[string]error
+	objectPutErrors map[string]error
 	containers      map[string]*container.Container
 	eaclTables      map[string]*eacl.Table
 	currentEpoch    uint64
+	key             *keys.PrivateKey
 }
 
-func NewTestFrostFS() *TestFrostFS {
+func NewTestFrostFS(key *keys.PrivateKey) *TestFrostFS {
 	return &TestFrostFS{
 		objects:         make(map[string]*object.Object),
 		objectErrors:    make(map[string]error),
+		objectPutErrors: make(map[string]error),
 		containers:      make(map[string]*container.Container),
 		eaclTables:      make(map[string]*eacl.Table),
+		key:             key,
 	}
 }
 
@@ -56,6 +61,14 @@ func (t *TestFrostFS) SetObjectError(addr oid.Address, err error) {
 	}
 }
 
+func (t *TestFrostFS) SetObjectPutError(fileName string, err error) {
+	if err == nil {
+		delete(t.objectPutErrors, fileName)
+	} else {
+		t.objectPutErrors[fileName] = err
+	}
+}
+
 func (t *TestFrostFS) Objects() []*object.Object {
 	res := make([]*object.Object, 0, len(t.objects))
 
@@ -168,8 +181,8 @@ func (t *TestFrostFS) ReadObject(ctx context.Context, prm PrmObjectRead) (*Objec
 	}
 
 	if obj, ok := t.objects[sAddr]; ok {
-		owner := getOwner(ctx)
-		if !obj.OwnerID().Equals(owner) && !t.isPublicRead(prm.Container) {
+		owner := getBearerOwner(ctx)
+		if !t.checkAccess(prm.Container, owner, eacl.OperationGet) {
 			return nil, ErrAccessDenied
 		}
 
@@ -199,6 +212,10 @@ func (t *TestFrostFS) CreateObject(_ context.Context, prm PrmObjectCreate) (oid.
 
 	attrs := make([]object.Attribute, 0)
 
+	if err := t.objectPutErrors[prm.Filepath]; err != nil {
+		return oid.ID{}, err
+	}
+
 	if prm.Filepath != "" {
 		a := object.NewAttribute()
 		a.SetKey(object.AttributeFilePath)
@@ -213,13 +230,16 @@ func (t *TestFrostFS) CreateObject(_ context.Context, prm PrmObjectCreate) (oid.
 		attrs = append(attrs, *a)
 	}
 
+	var owner user.ID
+	user.IDFromKey(&owner, t.key.PrivateKey.PublicKey)
+
 	obj := object.New()
 	obj.SetContainerID(prm.Container)
 	obj.SetID(id)
 	obj.SetPayloadSize(prm.PayloadSize)
 	obj.SetAttributes(attrs...)
 	obj.SetCreationEpoch(t.currentEpoch)
-	obj.SetOwnerID(&prm.Creator)
+	obj.SetOwnerID(&owner)
 	t.currentEpoch++
 
 	if len(prm.Locks) > 0 {
@@ -257,9 +277,9 @@ func (t *TestFrostFS) DeleteObject(ctx context.Context, prm PrmObjectDelete) err
 		return err
 	}
 
-	if obj, ok := t.objects[addr.EncodeToString()]; ok {
-		owner := getOwner(ctx)
-		if !obj.OwnerID().Equals(owner) {
+	if _, ok := t.objects[addr.EncodeToString()]; ok {
+		owner := getBearerOwner(ctx)
+		if !t.checkAccess(prm.Container, owner, eacl.OperationDelete) {
 			return ErrAccessDenied
 		}
 
@@ -311,27 +331,43 @@ func (t *TestFrostFS) ContainerEACL(_ context.Context, cnrID cid.ID) (*eacl.Tabl
 	return table, nil
 }
 
-func (t *TestFrostFS) isPublicRead(cnrID cid.ID) bool {
-	table, ok := t.eaclTables[cnrID.EncodeToString()]
+func (t *TestFrostFS) checkAccess(cnrID cid.ID, owner user.ID, op eacl.Operation) bool {
+	cnr, ok := t.containers[cnrID.EncodeToString()]
 	if !ok {
 		return false
 	}
 
+	if !cnr.BasicACL().Extendable() {
+		return cnr.Owner().Equals(owner)
+	}
+
+	table, ok := t.eaclTables[cnrID.EncodeToString()]
+	if !ok {
+		return true
+	}
+
 	for _, rec := range table.Records() {
-		if rec.Operation() == eacl.OperationGet && len(rec.Filters()) == 0 {
+		if rec.Operation() == op && len(rec.Filters()) == 0 {
 			for _, trgt := range rec.Targets() {
 				if trgt.Role() == eacl.RoleOthers {
 					return rec.Action() == eacl.ActionAllow
 				}
+				var targetOwner user.ID
+				for _, pk := range eacl.TargetECDSAKeys(&trgt) {
+					user.IDFromKey(&targetOwner, *pk)
+					if targetOwner.Equals(owner) {
+						return rec.Action() == eacl.ActionAllow
+					}
+				}
 			}
 		}
 	}
 
-	return false
+	return true
 }
 
-func getOwner(ctx context.Context) user.ID {
-	if bd, ok := ctx.Value(api.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
+func getBearerOwner(ctx context.Context) user.ID {
+	if bd, ok := ctx.Value(middleware.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
 		return bearer.ResolveIssuer(*bd.Gate.BearerToken)
 	}
 

api/layer/layer.go

@@ -15,6 +15,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
@@ -47,6 +48,7 @@ type (
 
 	layer struct {
 		frostFS     FrostFS
+		gateOwner   user.ID
 		log         *zap.Logger
 		anonKey     AnonymousKey
 		resolver    BucketResolver
@@ -56,6 +58,7 @@ type (
 	}
 
 	Config struct {
+		GateOwner    user.ID
 		ChainAddress string
 		Caches       *CachesConfig
 		AnonKey      AnonymousKey
@@ -73,7 +76,7 @@ type (
 		Range      *RangeParams
 		ObjectInfo *data.ObjectInfo
 		BucketInfo *data.BucketInfo
-		Writer     io.Writer
+		Versioned  bool
 		Encryption encryption.Params
 	}
 
@@ -110,6 +113,15 @@ type (
 		CopiesNumbers []uint32
 	}
 
+	PutCombinedObjectParams struct {
+		BktInfo    *data.BucketInfo
+		Object     string
+		Size       uint64
+		Header     map[string]string
+		Lock       *data.ObjectLock
+		Encryption encryption.Params
+	}
+
 	DeleteObjectParams struct {
 		BktInfo  *data.BucketInfo
 		Objects  []*VersionedObject
@@ -131,6 +143,7 @@ type (
 
 	// CopyObjectParams stores object copy request parameters.
 	CopyObjectParams struct {
+		SrcVersioned  bool
 		SrcObject     *data.ObjectInfo
 		ScrBktInfo    *data.BucketInfo
 		DstBktInfo    *data.BucketInfo
@@ -184,6 +197,13 @@ type (
 		Error             error
 	}
 
+	ObjectPayload struct {
+		r            io.Reader
+		params       getParams
+		encrypted    bool
+		decryptedLen uint64
+	}
+
 	// Client provides S3 API client interface.
 	Client interface {
 		Initialize(ctx context.Context, c EventListener) error
@@ -203,7 +223,7 @@ type (
 		CreateBucket(ctx context.Context, p *CreateBucketParams) (*data.BucketInfo, error)
 		DeleteBucket(ctx context.Context, p *DeleteBucketParams) error
 
-		GetObject(ctx context.Context, p *GetObjectParams) error
+		GetObject(ctx context.Context, p *GetObjectParams) (*ObjectPayload, error)
 		GetObjectInfo(ctx context.Context, p *HeadObjectParams) (*data.ObjectInfo, error)
 		GetExtendedObjectInfo(ctx context.Context, p *HeadObjectParams) (*data.ExtendedObjectInfo, error)
 
@@ -267,12 +287,17 @@ func (f MsgHandlerFunc) HandleMessage(ctx context.Context, msg *nats.Msg) error
 	return f(ctx, msg)
 }
 
+func (p HeadObjectParams) Versioned() bool {
+	return len(p.VersionID) > 0
+}
+
 // NewLayer creates an instance of a layer. It checks credentials
 // and establishes gRPC connection with the node.
 func NewLayer(log *zap.Logger, frostFS FrostFS, config *Config) Client {
 	return &layer{
 		frostFS:     frostFS,
 		log:         log,
+		gateOwner:   config.GateOwner,
 		anonKey:     config.AnonKey,
 		resolver:    config.Resolver,
 		cache:       NewCache(config.Caches),
@@ -303,22 +328,22 @@ func (n *layer) IsNotificationEnabled() bool {
 
 // IsAuthenticatedRequest checks if access box exists in the current request.
 func IsAuthenticatedRequest(ctx context.Context) bool {
-	_, ok := ctx.Value(api.BoxData).(*accessbox.Box)
+	_, ok := ctx.Value(middleware.BoxData).(*accessbox.Box)
 	return ok
 }
 
 // TimeNow returns client time from request or time.Now().
 func TimeNow(ctx context.Context) time.Time {
-	if now, ok := ctx.Value(api.ClientTime).(time.Time); ok {
+	if now, ok := ctx.Value(middleware.ClientTime).(time.Time); ok {
 		return now
 	}
 
 	return time.Now()
 }
 
-// Owner returns owner id from BearerToken (context) or from client owner.
-func (n *layer) Owner(ctx context.Context) user.ID {
-	if bd, ok := ctx.Value(api.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
+// BearerOwner returns owner id from BearerToken (context) or from client owner.
+func (n *layer) BearerOwner(ctx context.Context) user.ID {
+	if bd, ok := ctx.Value(middleware.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
 		return bearer.ResolveIssuer(*bd.Gate.BearerToken)
 	}
 
@@ -329,7 +354,7 @@ func (n *layer) Owner(ctx context.Context) user.ID {
 }
 
 func (n *layer) reqLogger(ctx context.Context) *zap.Logger {
-	reqLogger := api.GetReqLog(ctx)
+	reqLogger := middleware.GetReqLog(ctx)
 	if reqLogger != nil {
 		return reqLogger
 	}
@@ -337,7 +362,7 @@ func (n *layer) reqLogger(ctx context.Context) *zap.Logger {
 }
 
 func (n *layer) prepareAuthParameters(ctx context.Context, prm *PrmAuth, bktOwner user.ID) {
-	if bd, ok := ctx.Value(api.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
+	if bd, ok := ctx.Value(middleware.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
 		if bd.Gate.BearerToken.Impersonate() || bktOwner.Equals(bearer.ResolveIssuer(*bd.Gate.BearerToken)) {
 			prm.BearerToken = bd.Gate.BearerToken
 			return
@@ -361,7 +386,7 @@ func (n *layer) GetBucketInfo(ctx context.Context, name string) (*data.BucketInf
 	containerID, err := n.ResolveBucket(ctx, name)
 	if err != nil {
 		if strings.Contains(err.Error(), "not found") {
-			return nil, errors.GetAPIError(errors.ErrNoSuchBucket)
+			return nil, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchBucket), err.Error())
 		}
 		return nil, err
 	}
@@ -394,10 +419,10 @@ func (n *layer) ListBuckets(ctx context.Context) ([]*data.BucketInfo, error) {
 }
 
 // GetObject from storage.
-func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) error {
+func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) (*ObjectPayload, error) {
 	var params getParams
 
-	params.oid = p.ObjectInfo.ID
+	params.objInfo = p.ObjectInfo
 	params.bktInfo = p.BucketInfo
 
 	var decReader *encryption.Decrypter
@@ -405,7 +430,7 @@ func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) error {
 		var err error
 		decReader, err = getDecrypter(p)
 		if err != nil {
-			return fmt.Errorf("creating decrypter: %w", err)
+			return nil, fmt.Errorf("creating decrypter: %w", err)
 		}
 		params.off = decReader.EncryptedOffset()
 		params.ln = decReader.EncryptedLength()
@@ -419,32 +444,58 @@ func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) error {
 		}
 	}
 
-	payload, err := n.initObjectPayloadReader(ctx, params)
+	r, err := n.initObjectPayloadReader(ctx, params)
 	if err != nil {
-		return fmt.Errorf("init object payload reader: %w", err)
+		if client.IsErrObjectNotFound(err) {
+			if p.Versioned {
+				err = fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchVersion), err.Error())
+			} else {
+				err = fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchKey), err.Error())
+			}
 		}
 
+		return nil, fmt.Errorf("init object payload reader: %w", err)
+	}
+
+	var decryptedLen uint64
+	if decReader != nil {
+		if err = decReader.SetReader(r); err != nil {
+			return nil, fmt.Errorf("set reader to decrypter: %w", err)
+		}
+		r = io.LimitReader(decReader, int64(decReader.DecryptedLength()))
+		decryptedLen = decReader.DecryptedLength()
+	}
+
+	return &ObjectPayload{
+		r:            r,
+		params:       params,
+		encrypted:    decReader != nil,
+		decryptedLen: decryptedLen,
+	}, nil
+}
+
+// Read implements io.Reader. If you want to use ObjectPayload as io.Reader
+// you must not use ObjectPayload.StreamTo method and vice versa.
+func (o *ObjectPayload) Read(p []byte) (int, error) {
+	return o.r.Read(p)
+}
+
+// StreamTo reads all payload to provided writer.
+// If you want to use this method you must not use ObjectPayload.Read and vice versa.
+func (o *ObjectPayload) StreamTo(w io.Writer) error {
 	bufSize := uint64(32 * 1024) // configure?
-	if params.ln != 0 && params.ln < bufSize {
-		bufSize = params.ln
+	if o.params.ln != 0 && o.params.ln < bufSize {
+		bufSize = o.params.ln
 	}
 
 	// alloc buffer for copying
 	buf := make([]byte, bufSize) // sync-pool it?
 
-	r := payload
-	if decReader != nil {
-		if err = decReader.SetReader(payload); err != nil {
-			return fmt.Errorf("set reader to decrypter: %w", err)
-		}
-		r = io.LimitReader(decReader, int64(decReader.DecryptedLength()))
-	}
-
 	// copy full payload
-	written, err := io.CopyBuffer(p.Writer, r, buf)
+	written, err := io.CopyBuffer(w, o.r, buf)
 	if err != nil {
-		if decReader != nil {
-			return fmt.Errorf("copy object payload written: '%d', decLength: '%d', params.ln: '%d' : %w", written, decReader.DecryptedLength(), params.ln, err)
+		if o.encrypted {
+			return fmt.Errorf("copy object payload written: '%d', decLength: '%d', params.ln: '%d' : %w", written, o.decryptedLen, o.params.ln, err)
 		}
 		return fmt.Errorf("copy object payload written: '%d': %w", written, err)
 	}
@@ -496,10 +547,10 @@ func (n *layer) GetExtendedObjectInfo(ctx context.Context, p *HeadObjectParams)
 	var objInfo *data.ExtendedObjectInfo
 	var err error
 
-	if len(p.VersionID) == 0 {
-		objInfo, err = n.headLastVersionIfNotDeleted(ctx, p.BktInfo, p.Object)
-	} else {
+	if p.Versioned() {
 		objInfo, err = n.headVersion(ctx, p.BktInfo, p)
+	} else {
+		objInfo, err = n.headLastVersionIfNotDeleted(ctx, p.BktInfo, p.Object)
 	}
 	if err != nil {
 		return nil, err
@@ -514,27 +565,22 @@ func (n *layer) GetExtendedObjectInfo(ctx context.Context, p *HeadObjectParams)
 
 // CopyObject from one bucket into another bucket.
 func (n *layer) CopyObject(ctx context.Context, p *CopyObjectParams) (*data.ExtendedObjectInfo, error) {
-	pr, pw := io.Pipe()
-
-	go func() {
-		err := n.GetObject(ctx, &GetObjectParams{
+	objPayload, err := n.GetObject(ctx, &GetObjectParams{
 		ObjectInfo: p.SrcObject,
-			Writer:     pw,
+		Versioned:  p.SrcVersioned,
 		Range:      p.Range,
 		BucketInfo: p.ScrBktInfo,
 		Encryption: p.Encryption,
 	})
-
-		if err = pw.CloseWithError(err); err != nil {
-			n.reqLogger(ctx).Error("could not get object", zap.Error(err))
+	if err != nil {
+		return nil, fmt.Errorf("get object to copy: %w", err)
 	}
-	}()
 
 	return n.PutObject(ctx, &PutObjectParams{
 		BktInfo:       p.DstBktInfo,
 		Object:        p.DstObject,
 		Size:          p.SrcSize,
-		Reader:        pr,
+		Reader:        objPayload,
 		Header:        p.Header,
 		Encryption:    p.Encryption,
 		CopiesNumbers: p.CopiesNumbers,
@@ -615,7 +661,7 @@ func (n *layer) deleteObject(ctx context.Context, bkt *data.BucketInfo, settings
 		},
 		DeleteMarker: &data.DeleteMarkerInfo{
 			Created: TimeNow(ctx),
-			Owner:   n.Owner(ctx),
+			Owner:   n.gateOwner,
 		},
 		IsUnversioned: settings.VersioningSuspended(),
 	}

api/layer/multi_object_reader.go

@@ -0,0 +1,149 @@
+package layer
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+)
+
+type partObj struct {
+	OID  oid.ID
+	Size uint64
+}
+
+type readerInitiator interface {
+	initFrostFSObjectPayloadReader(ctx context.Context, p getFrostFSParams) (io.Reader, error)
+}
+
+// implements io.Reader of payloads of the object list stored in the FrostFS network.
+type multiObjectReader struct {
+	ctx context.Context
+
+	layer readerInitiator
+
+	startPartOffset uint64
+	endPartLength   uint64
+
+	prm getFrostFSParams
+
+	curIndex  int
+	curReader io.Reader
+
+	parts []partObj
+}
+
+type multiObjectReaderConfig struct {
+	layer readerInitiator
+
+	// the offset of complete object and total size to read
+	off, ln uint64
+
+	bktInfo *data.BucketInfo
+	parts   []partObj
+}
+
+var (
+	errOffsetIsOutOfRange = errors.New("offset is out of payload range")
+	errLengthIsOutOfRange = errors.New("length is out of payload range")
+	errEmptyPartsList     = errors.New("empty parts list")
+	errorZeroRangeLength  = errors.New("zero range length")
+)
+
+func newMultiObjectReader(ctx context.Context, cfg multiObjectReaderConfig) (*multiObjectReader, error) {
+	if len(cfg.parts) == 0 {
+		return nil, errEmptyPartsList
+	}
+
+	r := &multiObjectReader{
+		ctx:   ctx,
+		layer: cfg.layer,
+		prm: getFrostFSParams{
+			bktInfo: cfg.bktInfo,
+		},
+		parts: cfg.parts,
+	}
+
+	if cfg.off+cfg.ln == 0 {
+		return r, nil
+	}
+
+	if cfg.off > 0 && cfg.ln == 0 {
+		return nil, errorZeroRangeLength
+	}
+
+	startPartIndex, startPartOffset := findStartPart(cfg)
+	if startPartIndex == -1 {
+		return nil, errOffsetIsOutOfRange
+	}
+	r.startPartOffset = startPartOffset
+
+	endPartIndex, endPartLength := findEndPart(cfg)
+	if endPartIndex == -1 {
+		return nil, errLengthIsOutOfRange
+	}
+	r.endPartLength = endPartLength
+
+	r.parts = cfg.parts[startPartIndex : endPartIndex+1]
+
+	return r, nil
+}
+
+func findStartPart(cfg multiObjectReaderConfig) (index int, offset uint64) {
+	return findPartByPosition(cfg.off, cfg.parts)
+}
+
+func findEndPart(cfg multiObjectReaderConfig) (index int, length uint64) {
+	return findPartByPosition(cfg.off+cfg.ln, cfg.parts)
+}
+
+func findPartByPosition(position uint64, parts []partObj) (index int, positionInPart uint64) {
+	for i, part := range parts {
+		if position <= part.Size {
+			return i, position
+		}
+		position -= part.Size
+	}
+
+	return -1, 0
+}
+
+func (x *multiObjectReader) Read(p []byte) (n int, err error) {
+	if x.curReader != nil {
+		n, err = x.curReader.Read(p)
+		if !errors.Is(err, io.EOF) {
+			return n, err
+		}
+		x.curIndex++
+	}
+
+	if x.curIndex == len(x.parts) {
+		return n, io.EOF
+	}
+
+	x.prm.oid = x.parts[x.curIndex].OID
+
+	if x.curIndex == 0 {
+		x.prm.off = x.startPartOffset
+		x.prm.ln = x.parts[x.curIndex].Size - x.startPartOffset
+	}
+
+	if x.curIndex == len(x.parts)-1 {
+		x.prm.ln = x.endPartLength - x.prm.off
+	}
+
+	x.curReader, err = x.layer.initFrostFSObjectPayloadReader(x.ctx, x.prm)
+	if err != nil {
+		return n, fmt.Errorf("init payload reader for the next part: %w", err)
+	}
+
+	x.prm.off = 0
+	x.prm.ln = 0
+
+	next, err := x.Read(p[n:])
+
+	return n + next, err
+}

api/layer/multi_object_reader_test.go

@@ -0,0 +1,127 @@
+package layer
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"testing"
+
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
+	"github.com/stretchr/testify/require"
+)
+
+type readerInitiatorMock struct {
+	parts map[oid.ID][]byte
+}
+
+func (r *readerInitiatorMock) initFrostFSObjectPayloadReader(_ context.Context, p getFrostFSParams) (io.Reader, error) {
+	partPayload, ok := r.parts[p.oid]
+	if !ok {
+		return nil, errors.New("part not found")
+	}
+
+	if p.off+p.ln == 0 {
+		return bytes.NewReader(partPayload), nil
+	}
+
+	if p.off > uint64(len(partPayload)-1) {
+		return nil, fmt.Errorf("invalid offset: %d/%d", p.off, len(partPayload))
+	}
+
+	if p.off+p.ln > uint64(len(partPayload)) {
+		return nil, fmt.Errorf("invalid range: %d-%d/%d", p.off, p.off+p.ln, len(partPayload))
+	}
+
+	return bytes.NewReader(partPayload[p.off : p.off+p.ln]), nil
+}
+
+func prepareDataReader() ([]byte, []partObj, *readerInitiatorMock) {
+	mockInitReader := &readerInitiatorMock{
+		parts: map[oid.ID][]byte{
+			oidtest.ID(): []byte("first part 1"),
+			oidtest.ID(): []byte("second part 2"),
+			oidtest.ID(): []byte("third part 3"),
+		},
+	}
+
+	var fullPayload []byte
+	parts := make([]partObj, 0, len(mockInitReader.parts))
+	for id, payload := range mockInitReader.parts {
+		parts = append(parts, partObj{OID: id, Size: uint64(len(payload))})
+		fullPayload = append(fullPayload, payload...)
+	}
+
+	return fullPayload, parts, mockInitReader
+}
+
+func TestMultiReader(t *testing.T) {
+	ctx := context.Background()
+
+	fullPayload, parts, mockInitReader := prepareDataReader()
+
+	for _, tc := range []struct {
+		name string
+		off  uint64
+		ln   uint64
+		err  error
+	}{
+		{
+			name: "simple read all",
+		},
+		{
+			name: "simple read with length",
+			ln:   uint64(len(fullPayload)),
+		},
+		{
+			name: "middle of parts",
+			off:  parts[0].Size + 2,
+			ln:   4,
+		},
+		{
+			name: "first and second",
+			off:  parts[0].Size - 4,
+			ln:   8,
+		},
+		{
+			name: "first and third",
+			off:  parts[0].Size - 4,
+			ln:   parts[1].Size + 8,
+		},
+		{
+			name: "offset out of range",
+			off:  uint64(len(fullPayload) + 1),
+			ln:   1,
+			err:  errOffsetIsOutOfRange,
+		},
+		{
+			name: "zero length",
+			off:  parts[1].Size + 1,
+			ln:   0,
+			err:  errorZeroRangeLength,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			multiReader, err := newMultiObjectReader(ctx, multiObjectReaderConfig{
+				layer: mockInitReader,
+				parts: parts,
+				off:   tc.off,
+				ln:    tc.ln,
+			})
+			require.ErrorIs(t, err, tc.err)
+
+			if tc.err == nil {
+				off := tc.off
+				ln := tc.ln
+				if off+ln == 0 {
+					ln = uint64(len(fullPayload))
+				}
+				data, err := io.ReadAll(multiReader)
+				require.NoError(t, err)
+				require.Equal(t, fullPayload[off:off+ln], data)
+			}
+		})
+	}
+}

api/layer/multipart_upload.go

@@ -1,9 +1,11 @@
 package layer
 
 import (
+	"bytes"
 	"context"
 	"encoding/hex"
-	stderrors "errors"
+	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"sort"
@@ -12,7 +14,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
@@ -25,6 +27,10 @@ const (
 	UploadPartNumberAttributeName = "S3-Upload-Part-Number"
 	UploadCompletedParts          = "S3-Completed-Parts"
 
+	// MultipartObjectSize contains the real object size if object is combined (payload contains list of parts).
+	// This header is used to determine if object is combined.
+	MultipartObjectSize = "S3-Multipart-Object-Size"
+
 	metaPrefix = "meta-"
 	aclPrefix  = "acl-"
 
@@ -32,8 +38,8 @@ const (
 	MaxSizePartsList    = 1000
 	UploadMinPartNumber = 1
 	UploadMaxPartNumber = 10000
-	uploadMinSize       = 5 * 1048576    // 5MB
-	uploadMaxSize       = 5 * 1073741824 // 5GB
+	UploadMinSize       = 5 * 1024 * 1024      // 5MB
+	UploadMaxSize       = 1024 * UploadMinSize // 5GB
 )
 
 type (
@@ -64,6 +70,7 @@ type (
 	}
 
 	UploadCopyParams struct {
+		Versioned  bool
 		Info       *UploadInfoParams
 		SrcObjInfo *data.ObjectInfo
 		SrcBktInfo *data.BucketInfo
@@ -142,7 +149,7 @@ func (n *layer) CreateMultipartUpload(ctx context.Context, p *CreateMultipartPar
 	info := &data.MultipartInfo{
 		Key:           p.Info.Key,
 		UploadID:      p.Info.UploadID,
-		Owner:         n.Owner(ctx),
+		Owner:         n.gateOwner,
 		Created:       TimeNow(ctx),
 		Meta:          make(map[string]string, metaSize),
 		CopiesNumbers: p.CopiesNumbers,
@@ -174,14 +181,14 @@ func (n *layer) CreateMultipartUpload(ctx context.Context, p *CreateMultipartPar
 func (n *layer) UploadPart(ctx context.Context, p *UploadPartParams) (string, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Info.Bkt, p.Info.Key, p.Info.UploadID)
 	if err != nil {
-		if stderrors.Is(err, ErrNodeNotFound) {
-			return "", errors.GetAPIError(errors.ErrNoSuchUpload)
+		if errors.Is(err, ErrNodeNotFound) {
+			return "", fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchUpload), err.Error())
 		}
 		return "", err
 	}
 
-	if p.Size > uploadMaxSize {
-		return "", errors.GetAPIError(errors.ErrEntityTooLarge)
+	if p.Size > UploadMaxSize {
+		return "", fmt.Errorf("%w: %d/%d", s3errors.GetAPIError(s3errors.ErrEntityTooLarge), p.Size, UploadMaxSize)
 	}
 
 	objInfo, err := n.uploadPart(ctx, multipartInfo, p)
@@ -196,13 +203,12 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 	if err := p.Info.Encryption.MatchObjectEncryption(encInfo); err != nil {
 		n.reqLogger(ctx).Warn("mismatched obj encryptionInfo", zap.Error(err))
-		return nil, errors.GetAPIError(errors.ErrInvalidEncryptionParameters)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidEncryptionParameters)
 	}
 
 	bktInfo := p.Info.Bkt
 	prm := PrmObjectCreate{
 		Container:    bktInfo.CID,
-		Creator:      bktInfo.Owner,
 		Attributes:   make([][2]string, 2),
 		Payload:      p.Reader,
 		CreationTime: TimeNow(ctx),
@@ -246,7 +252,7 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 	}
 
 	oldPartID, err := n.treeService.AddPart(ctx, bktInfo, multipartInfo.ID, partInfo)
-	oldPartIDNotFound := stderrors.Is(err, ErrNoNodeToRemove)
+	oldPartIDNotFound := errors.Is(err, ErrNoNodeToRemove)
 	if err != nil && !oldPartIDNotFound {
 		return nil, err
 	}
@@ -275,8 +281,8 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 func (n *layer) UploadPartCopy(ctx context.Context, p *UploadCopyParams) (*data.ObjectInfo, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Info.Bkt, p.Info.Key, p.Info.UploadID)
 	if err != nil {
-		if stderrors.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchUpload)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchUpload), err.Error())
 		}
 		return nil, err
 	}
@@ -285,81 +291,37 @@ func (n *layer) UploadPartCopy(ctx context.Context, p *UploadCopyParams) (*data.
 	if p.Range != nil {
 		size = p.Range.End - p.Range.Start + 1
 		if p.Range.End > p.SrcObjInfo.Size {
-			return nil, errors.GetAPIError(errors.ErrInvalidCopyPartRangeSource)
+			return nil, fmt.Errorf("%w: %d-%d/%d", s3errors.GetAPIError(s3errors.ErrInvalidCopyPartRangeSource), p.Range.Start, p.Range.End, p.SrcObjInfo.Size)
 		}
 	}
-	if size > uploadMaxSize {
-		return nil, errors.GetAPIError(errors.ErrEntityTooLarge)
+	if size > UploadMaxSize {
+		return nil, fmt.Errorf("%w: %d/%d", s3errors.GetAPIError(s3errors.ErrEntityTooLarge), size, UploadMaxSize)
 	}
 
-	pr, pw := io.Pipe()
-
-	go func() {
-		err = n.GetObject(ctx, &GetObjectParams{
+	objPayload, err := n.GetObject(ctx, &GetObjectParams{
 		ObjectInfo: p.SrcObjInfo,
-			Writer:     pw,
+		Versioned:  p.Versioned,
 		Range:      p.Range,
 		BucketInfo: p.SrcBktInfo,
 	})
-
-		if err = pw.CloseWithError(err); err != nil {
-			n.reqLogger(ctx).Error("could not get object", zap.Error(err))
+	if err != nil {
+		return nil, fmt.Errorf("get object to upload copy: %w", err)
 	}
-	}()
 
 	params := &UploadPartParams{
 		Info:       p.Info,
 		PartNumber: p.PartNumber,
 		Size:       size,
-		Reader:     pr,
+		Reader:     objPayload,
 	}
 
 	return n.uploadPart(ctx, multipartInfo, params)
 }
 
-// implements io.Reader of payloads of the object list stored in the FrostFS network.
-type multiObjectReader struct {
-	ctx context.Context
-
-	layer *layer
-
-	prm getParams
-
-	curReader io.Reader
-
-	parts []*data.PartInfo
-}
-
-func (x *multiObjectReader) Read(p []byte) (n int, err error) {
-	if x.curReader != nil {
-		n, err = x.curReader.Read(p)
-		if !stderrors.Is(err, io.EOF) {
-			return n, err
-		}
-	}
-
-	if len(x.parts) == 0 {
-		return n, io.EOF
-	}
-
-	x.prm.oid = x.parts[0].OID
-
-	x.curReader, err = x.layer.initObjectPayloadReader(x.ctx, x.prm)
-	if err != nil {
-		return n, fmt.Errorf("init payload reader for the next part: %w", err)
-	}
-
-	x.parts = x.parts[1:]
-
-	next, err := x.Read(p[n:])
-
-	return n + next, err
-}
-
 func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipartParams) (*UploadData, *data.ExtendedObjectInfo, error) {
 	for i := 1; i < len(p.Parts); i++ {
 		if p.Parts[i].PartNumber <= p.Parts[i-1].PartNumber {
-			return nil, nil, errors.GetAPIError(errors.ErrInvalidPartOrder)
+			return nil, nil, s3errors.GetAPIError(s3errors.ErrInvalidPartOrder)
 		}
 	}
 
@@ -370,7 +332,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 
 	if len(partsInfo) < len(p.Parts) {
-		return nil, nil, errors.GetAPIError(errors.ErrInvalidPart)
+		return nil, nil, fmt.Errorf("%w: found %d parts, need %d", s3errors.GetAPIError(s3errors.ErrInvalidPart), len(partsInfo), len(p.Parts))
 	}
 
 	var multipartObjetSize uint64
@@ -381,11 +343,13 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 	for i, part := range p.Parts {
 		partInfo := partsInfo[part.PartNumber]
 		if partInfo == nil || part.ETag != partInfo.ETag {
-			return nil, nil, errors.GetAPIError(errors.ErrInvalidPart)
+			return nil, nil, fmt.Errorf("%w: unknown part %d or etag mismatched", s3errors.GetAPIError(s3errors.ErrInvalidPart), part.PartNumber)
 		}
+		delete(partsInfo, part.PartNumber)
+
 		// for the last part we have no minimum size limit
-		if i != len(p.Parts)-1 && partInfo.Size < uploadMinSize {
-			return nil, nil, errors.GetAPIError(errors.ErrEntityTooSmall)
+		if i != len(p.Parts)-1 && partInfo.Size < UploadMinSize {
+			return nil, nil, fmt.Errorf("%w: %d/%d", s3errors.GetAPIError(s3errors.ErrEntityTooSmall), partInfo.Size, UploadMinSize)
 		}
 		parts = append(parts, partInfo)
 		multipartObjetSize += partInfo.Size // even if encryption is enabled size is actual (decrypted)
@@ -409,6 +373,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 
 	initMetadata := make(map[string]string, len(multipartInfo.Meta)+1)
 	initMetadata[UploadCompletedParts] = completedPartsHeader.String()
+	initMetadata[MultipartObjectSize] = strconv.FormatUint(multipartObjetSize, 10)
 
 	uploadData := &UploadData{
 		TagSet:     make(map[string]string),
@@ -432,18 +397,15 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 		multipartObjetSize = encMultipartObjectSize
 	}
 
-	r := &multiObjectReader{
-		ctx:   ctx,
-		layer: n,
-		parts: parts,
+	partsData, err := json.Marshal(parts)
+	if err != nil {
+		return nil, nil, fmt.Errorf("marshal parst for combined object: %w", err)
 	}
 
-	r.prm.bktInfo = p.Info.Bkt
-
 	extObjInfo, err := n.PutObject(ctx, &PutObjectParams{
 		BktInfo:       p.Info.Bkt,
 		Object:        p.Info.Key,
-		Reader:        r,
+		Reader:        bytes.NewReader(partsData),
 		Header:        initMetadata,
 		Size:          multipartObjetSize,
 		Encryption:    p.Info.Encryption,
@@ -455,7 +417,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 			zap.String("uploadKey", p.Info.Key),
 			zap.Error(err))
 
-		return nil, nil, errors.GetAPIError(errors.ErrInternalError)
+		return nil, nil, s3errors.GetAPIError(s3errors.ErrInternalError)
 	}
 
 	var addr oid.Address
@@ -559,7 +521,7 @@ func (n *layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 	if err = p.Info.Encryption.MatchObjectEncryption(encInfo); err != nil {
 		n.reqLogger(ctx).Warn("mismatched obj encryptionInfo", zap.Error(err))
-		return nil, errors.GetAPIError(errors.ErrInvalidEncryptionParameters)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidEncryptionParameters)
 	}
 
 	res.Owner = multipartInfo.Owner
@@ -602,8 +564,8 @@ func (n *layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 func (n *layer) getUploadParts(ctx context.Context, p *UploadInfoParams) (*data.MultipartInfo, map[int]*data.PartInfo, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Bkt, p.Key, p.UploadID)
 	if err != nil {
-		if stderrors.Is(err, ErrNodeNotFound) {
-			return nil, nil, errors.GetAPIError(errors.ErrNoSuchUpload)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchUpload), err.Error())
 		}
 		return nil, nil, err
 	}

api/layer/notifications.go

@@ -7,13 +7,13 @@ import (
 	errorsStd "errors"
 	"fmt"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"go.uber.org/zap"
 )
 
 type PutBucketNotificationConfigurationParams struct {
-	RequestInfo   *api.ReqInfo
+	RequestInfo   *middleware.ReqInfo
 	BktInfo       *data.BucketInfo
 	Configuration *data.NotificationConfiguration
 	CopiesNumbers []uint32
@@ -27,7 +27,6 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 
 	prm := PrmObjectCreate{
 		Container:    p.BktInfo.CID,
-		Creator:      p.BktInfo.Owner,
 		Payload:      bytes.NewReader(confXML),
 		Filepath:     p.BktInfo.NotificationConfigurationObjectName(),
 		CreationTime: TimeNow(ctx),
@@ -53,13 +52,13 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 		}
 	}
 
-	n.cache.PutNotificationConfiguration(n.Owner(ctx), p.BktInfo, p.Configuration)
+	n.cache.PutNotificationConfiguration(n.BearerOwner(ctx), p.BktInfo, p.Configuration)
 
 	return nil
 }
 
 func (n *layer) GetBucketNotificationConfiguration(ctx context.Context, bktInfo *data.BucketInfo) (*data.NotificationConfiguration, error) {
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if conf := n.cache.GetNotificationConfiguration(owner, bktInfo); conf != nil {
 		return conf, nil
 	}

api/layer/object.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -32,6 +33,14 @@ type (
 		// payload range
 		off, ln uint64
 
+		objInfo *data.ObjectInfo
+		bktInfo *data.BucketInfo
+	}
+
+	getFrostFSParams struct {
+		// payload range
+		off, ln uint64
+
 		oid     oid.ID
 		bktInfo *data.BucketInfo
 	}
@@ -98,9 +107,54 @@ func (n *layer) objectHead(ctx context.Context, bktInfo *data.BucketInfo, idObj
 	return res.Head, nil
 }
 
+func (n *layer) initObjectPayloadReader(ctx context.Context, p getParams) (io.Reader, error) {
+	if _, isCombined := p.objInfo.Headers[MultipartObjectSize]; !isCombined {
+		return n.initFrostFSObjectPayloadReader(ctx, getFrostFSParams{
+			off:     p.off,
+			ln:      p.ln,
+			oid:     p.objInfo.ID,
+			bktInfo: p.bktInfo,
+		})
+	}
+
+	combinedObj, err := n.objectGet(ctx, p.bktInfo, p.objInfo.ID)
+	if err != nil {
+		return nil, fmt.Errorf("get combined object '%s': %w", p.objInfo.ID.EncodeToString(), err)
+	}
+
+	var parts []*data.PartInfo
+	if err = json.Unmarshal(combinedObj.Payload(), &parts); err != nil {
+		return nil, fmt.Errorf("unmarshal combined object parts: %w", err)
+	}
+
+	isEncrypted := FormEncryptionInfo(p.objInfo.Headers).Enabled
+	objParts := make([]partObj, len(parts))
+	for i, part := range parts {
+		size := part.Size
+		if isEncrypted {
+			if size, err = sio.EncryptedSize(part.Size); err != nil {
+				return nil, fmt.Errorf("compute encrypted size: %w", err)
+			}
+		}
+
+		objParts[i] = partObj{
+			OID:  part.OID,
+			Size: size,
+		}
+	}
+
+	return newMultiObjectReader(ctx, multiObjectReaderConfig{
+		layer:   n,
+		off:     p.off,
+		ln:      p.ln,
+		parts:   objParts,
+		bktInfo: p.bktInfo,
+	})
+}
+
 // initializes payload reader of the FrostFS object.
 // Zero range corresponds to full payload (panics if only offset is set).
-func (n *layer) initObjectPayloadReader(ctx context.Context, p getParams) (io.Reader, error) {
+func (n *layer) initFrostFSObjectPayloadReader(ctx context.Context, p getFrostFSParams) (io.Reader, error) {
 	prm := PrmObjectRead{
 		Container:    p.bktInfo.CID,
 		Object:       p.oid,
@@ -184,8 +238,6 @@ func ParseCompletedPartHeader(hdr string) (*Part, error) {
 
 // PutObject stores object into FrostFS, took payload from io.Reader.
 func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.ExtendedObjectInfo, error) {
-	owner := n.Owner(ctx)
-
 	bktSettings, err := n.GetBucketSettings(ctx, p.BktInfo)
 	if err != nil {
 		return nil, fmt.Errorf("couldn't get versioning settings object: %w", err)
@@ -221,7 +273,6 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 
 	prm := PrmObjectCreate{
 		Container:    p.BktInfo.CID,
-		Creator:      owner,
 		PayloadSize:  p.Size,
 		Filepath:     p.Object,
 		Payload:      r,
@@ -250,6 +301,7 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 			Size:     size,
 		},
 		IsUnversioned: !bktSettings.VersioningEnabled(),
+		IsCombined:    p.Header[MultipartObjectSize] != "",
 	}
 
 	if newVersion.ID, err = n.treeService.AddVersion(ctx, p.BktInfo, newVersion); err != nil {
@@ -279,7 +331,7 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 		ID:  id,
 		CID: p.BktInfo.CID,
 
-		Owner:       owner,
+		Owner:       n.gateOwner,
 		Bucket:      p.BktInfo.Name,
 		Name:        p.Object,
 		Size:        size,
@@ -294,13 +346,13 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 		NodeVersion: newVersion,
 	}
 
-	n.cache.PutObjectWithName(owner, extendedObjInfo)
+	n.cache.PutObjectWithName(n.BearerOwner(ctx), extendedObjInfo)
 
 	return extendedObjInfo, nil
 }
 
 func (n *layer) headLastVersionIfNotDeleted(ctx context.Context, bkt *data.BucketInfo, objectName string) (*data.ExtendedObjectInfo, error) {
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if extObjInfo := n.cache.GetLastObject(owner, bkt.Name, objectName); extObjInfo != nil {
 		return extObjInfo, nil
 	}
@@ -308,17 +360,20 @@ func (n *layer) headLastVersionIfNotDeleted(ctx context.Context, bkt *data.Bucke
 	node, err := n.treeService.GetLatestVersion(ctx, bkt, objectName)
 	if err != nil {
 		if errors.Is(err, ErrNodeNotFound) {
-			return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchKey)
+			return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchKey), err.Error())
 		}
 		return nil, err
 	}
 
 	if node.IsDeleteMarker() {
-		return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchKey)
+		return nil, fmt.Errorf("%w: found version is delete marker", apiErrors.GetAPIError(apiErrors.ErrNoSuchKey))
 	}
 
 	meta, err := n.objectHead(ctx, bkt, node.OID)
 	if err != nil {
+		if client.IsErrObjectNotFound(err) {
+			return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchKey), err.Error())
+		}
 		return nil, err
 	}
 	objInfo := objectInfoFromMeta(bkt, meta)
@@ -340,7 +395,7 @@ func (n *layer) headVersion(ctx context.Context, bkt *data.BucketInfo, p *HeadOb
 		foundVersion, err = n.treeService.GetUnversioned(ctx, bkt, p.Object)
 		if err != nil {
 			if errors.Is(err, ErrNodeNotFound) {
-				return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion)
+				return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion), err.Error())
 			}
 			return nil, err
 		}
@@ -357,11 +412,11 @@ func (n *layer) headVersion(ctx context.Context, bkt *data.BucketInfo, p *HeadOb
 			}
 		}
 		if foundVersion == nil {
-			return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion)
+			return nil, fmt.Errorf("%w: there isn't tree node with requested version id", apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion))
 		}
 	}
 
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if extObjInfo := n.cache.GetObject(owner, newAddress(bkt.CID, foundVersion.OID)); extObjInfo != nil {
 		return extObjInfo, nil
 	}
@@ -369,7 +424,7 @@ func (n *layer) headVersion(ctx context.Context, bkt *data.BucketInfo, p *HeadOb
 	meta, err := n.objectHead(ctx, bkt, foundVersion.OID)
 	if err != nil {
 		if client.IsErrObjectNotFound(err) {
-			return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion)
+			return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion), err.Error())
 		}
 		return nil, err
 	}
@@ -411,6 +466,10 @@ func (n *layer) objectPutAndHash(ctx context.Context, prm PrmObjectCreate, bktIn
 	})
 	id, err := n.frostFS.CreateObject(ctx, prm)
 	if err != nil {
+		if _, errDiscard := io.Copy(io.Discard, prm.Payload); errDiscard != nil {
+			n.reqLogger(ctx).Warn("failed to discard put payload, probably goroutine leaks", zap.Error(errDiscard))
+		}
+
 		return 0, oid.ID{}, nil, err
 	}
 	return size, id, hash.Sum(nil), nil
@@ -484,7 +543,7 @@ func (n *layer) getLatestObjectsVersions(ctx context.Context, p allObjectParams)
 		return nil, nil, nil
 	}
 
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	cacheKey := cache.CreateObjectsListCacheKey(p.Bucket.CID, p.Prefix, true)
 	nodeVersions := n.cache.GetList(owner, cacheKey)
 
@@ -612,7 +671,7 @@ func (n *layer) initWorkerPool(ctx context.Context, size int, p allObjectParams,
 func (n *layer) bucketNodeVersions(ctx context.Context, bkt *data.BucketInfo, prefix string) ([]*data.NodeVersion, error) {
 	var err error
 
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	cacheKey := cache.CreateObjectsListCacheKey(bkt.CID, prefix, false)
 	nodeVersions := n.cache.GetList(owner, cacheKey)
 
@@ -732,7 +791,7 @@ func (n *layer) objectInfoFromObjectsCacheOrFrostFS(ctx context.Context, bktInfo
 		return oiDir
 	}
 
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if extInfo := n.cache.GetObject(owner, newAddress(bktInfo.CID, node.OID)); extInfo != nil {
 		return extInfo.ObjectInfo
 	}

api/layer/system_object.go

@@ -95,14 +95,14 @@ func (n *layer) PutLockInfo(ctx context.Context, p *PutLockInfoParams) (err erro
 		return fmt.Errorf("couldn't put lock into tree: %w", err)
 	}
 
-	n.cache.PutLockInfo(n.Owner(ctx), lockObjectKey(p.ObjVersion), lockInfo)
+	n.cache.PutLockInfo(n.BearerOwner(ctx), lockObjectKey(p.ObjVersion), lockInfo)
 
 	return nil
 }
 
 func (n *layer) getNodeVersionFromCacheOrFrostfs(ctx context.Context, objVersion *ObjectVersion) (nodeVersion *data.NodeVersion, err error) {
 	// check cache if node version is stored inside extendedObjectVersion
-	nodeVersion = n.getNodeVersionFromCache(n.Owner(ctx), objVersion)
+	nodeVersion = n.getNodeVersionFromCache(n.BearerOwner(ctx), objVersion)
 	if nodeVersion == nil {
 		// else get node version from tree service
 		return n.getNodeVersion(ctx, objVersion)
@@ -114,7 +114,6 @@ func (n *layer) getNodeVersionFromCacheOrFrostfs(ctx context.Context, objVersion
 func (n *layer) putLockObject(ctx context.Context, bktInfo *data.BucketInfo, objID oid.ID, lock *data.ObjectLock, copiesNumber []uint32) (oid.ID, error) {
 	prm := PrmObjectCreate{
 		Container:    bktInfo.CID,
-		Creator:      bktInfo.Owner,
 		Locks:        []oid.ID{objID},
 		CreationTime: TimeNow(ctx),
 		CopiesNumber: copiesNumber,
@@ -131,7 +130,7 @@ func (n *layer) putLockObject(ctx context.Context, bktInfo *data.BucketInfo, obj
 }
 
 func (n *layer) GetLockInfo(ctx context.Context, objVersion *ObjectVersion) (*data.LockInfo, error) {
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if lockInfo := n.cache.GetLockInfo(owner, lockObjectKey(objVersion)); lockInfo != nil {
 		return lockInfo, nil
 	}
@@ -155,7 +154,7 @@ func (n *layer) GetLockInfo(ctx context.Context, objVersion *ObjectVersion) (*da
 }
 
 func (n *layer) getCORS(ctx context.Context, bkt *data.BucketInfo) (*data.CORSConfiguration, error) {
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if cors := n.cache.GetCORS(owner, bkt); cors != nil {
 		return cors, nil
 	}
@@ -167,7 +166,7 @@ func (n *layer) getCORS(ctx context.Context, bkt *data.BucketInfo) (*data.CORSCo
 	}
 
 	if objIDNotFound {
-		return nil, errors.GetAPIError(errors.ErrNoSuchCORSConfiguration)
+		return nil, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchCORSConfiguration), err.Error())
 	}
 
 	obj, err := n.objectGet(ctx, bkt, objID)
@@ -192,7 +191,7 @@ func lockObjectKey(objVersion *ObjectVersion) string {
 }
 
 func (n *layer) GetBucketSettings(ctx context.Context, bktInfo *data.BucketInfo) (*data.BucketSettings, error) {
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 	if settings := n.cache.GetSettings(owner, bktInfo); settings != nil {
 		return settings, nil
 	}
@@ -215,7 +214,7 @@ func (n *layer) PutBucketSettings(ctx context.Context, p *PutSettingsParams) err
 		return fmt.Errorf("failed to get settings node: %w", err)
 	}
 
-	n.cache.PutSettings(n.Owner(ctx), p.BktInfo, p.Settings)
+	n.cache.PutSettings(n.BearerOwner(ctx), p.BktInfo, p.Settings)
 
 	return nil
 }

api/layer/tagging.go

@@ -2,10 +2,11 @@ package layer
 
 import (
 	"context"
-	errorsStd "errors"
+	"errors"
+	"fmt"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
@@ -29,7 +30,7 @@ type PutObjectTaggingParams struct {
 
 func (n *layer) GetObjectTagging(ctx context.Context, p *GetObjectTaggingParams) (string, map[string]string, error) {
 	var err error
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 
 	if len(p.ObjectVersion.VersionID) != 0 && p.ObjectVersion.VersionID != data.UnversionedObjectVersionID {
 		if tags := n.cache.GetTagging(owner, objectTaggingCacheKey(p.ObjectVersion)); tags != nil {
@@ -52,8 +53,8 @@ func (n *layer) GetObjectTagging(ctx context.Context, p *GetObjectTaggingParams)
 
 	tags, err := n.treeService.GetObjectTagging(ctx, p.ObjectVersion.BktInfo, nodeVersion)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return "", nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return "", nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return "", nil, err
 	}
@@ -75,13 +76,13 @@ func (n *layer) PutObjectTagging(ctx context.Context, p *PutObjectTaggingParams)
 
 	err = n.treeService.PutObjectTagging(ctx, p.ObjectVersion.BktInfo, nodeVersion, p.TagSet)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return nil, err
 	}
 
-	n.cache.PutTagging(n.Owner(ctx), objectTaggingCacheKey(p.ObjectVersion), p.TagSet)
+	n.cache.PutTagging(n.BearerOwner(ctx), objectTaggingCacheKey(p.ObjectVersion), p.TagSet)
 
 	return nodeVersion, nil
 }
@@ -94,8 +95,8 @@ func (n *layer) DeleteObjectTagging(ctx context.Context, p *ObjectVersion) (*dat
 
 	err = n.treeService.DeleteObjectTagging(ctx, p.BktInfo, version)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return nil, err
 	}
@@ -108,14 +109,14 @@ func (n *layer) DeleteObjectTagging(ctx context.Context, p *ObjectVersion) (*dat
 }
 
 func (n *layer) GetBucketTagging(ctx context.Context, bktInfo *data.BucketInfo) (map[string]string, error) {
-	owner := n.Owner(ctx)
+	owner := n.BearerOwner(ctx)
 
 	if tags := n.cache.GetTagging(owner, bucketTaggingCacheKey(bktInfo.CID)); tags != nil {
 		return tags, nil
 	}
 
 	tags, err := n.treeService.GetBucketTagging(ctx, bktInfo)
-	if err != nil && !errorsStd.Is(err, ErrNodeNotFound) {
+	if err != nil && !errors.Is(err, ErrNodeNotFound) {
 		return nil, err
 	}
 
@@ -129,7 +130,7 @@ func (n *layer) PutBucketTagging(ctx context.Context, bktInfo *data.BucketInfo,
 		return err
 	}
 
-	n.cache.PutTagging(n.Owner(ctx), bucketTaggingCacheKey(bktInfo.CID), tagSet)
+	n.cache.PutTagging(n.BearerOwner(ctx), bucketTaggingCacheKey(bktInfo.CID), tagSet)
 
 	return nil
 }
@@ -168,12 +169,14 @@ func (n *layer) getNodeVersion(ctx context.Context, objVersion *ObjectVersion) (
 			}
 		}
 		if version == nil {
-			err = errors.GetAPIError(errors.ErrNoSuchVersion)
+			err = fmt.Errorf("%w: there isn't tree node with requested version id", s3errors.GetAPIError(s3errors.ErrNoSuchVersion))
 		}
 	}
 
-	if err == nil && version.IsDeleteMarker() && !objVersion.NoErrorOnDeleteMarker || errorsStd.Is(err, ErrNodeNotFound) {
-		return nil, errors.GetAPIError(errors.ErrNoSuchKey)
+	if err == nil && version.IsDeleteMarker() && !objVersion.NoErrorOnDeleteMarker {
+		return nil, fmt.Errorf("%w: found version is delete marker", s3errors.GetAPIError(s3errors.ErrNoSuchKey))
+	} else if errors.Is(err, ErrNodeNotFound) {
+		return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 	}
 
 	if err == nil && version != nil && !version.IsDeleteMarker() {

api/layer/util.go

@@ -9,9 +9,9 @@ import (
 	"strings"
 	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 )
@@ -141,7 +141,7 @@ func NameFromString(name string) (string, string) {
 // GetBoxData  extracts accessbox.Box from context.
 func GetBoxData(ctx context.Context) (*accessbox.Box, error) {
 	var boxData *accessbox.Box
-	data, ok := ctx.Value(api.BoxData).(*accessbox.Box)
+	data, ok := ctx.Value(middleware.BoxData).(*accessbox.Box)
 	if !ok || data == nil {
 		return nil, fmt.Errorf("couldn't get box data from context")
 	}

api/layer/versioning_test.go

@@ -3,10 +3,11 @@ package layer
 import (
 	"bytes"
 	"context"
+	"io"
 	"testing"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	bearertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer/test"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -31,26 +32,29 @@ func (tc *testContext) putObject(content []byte) *data.ObjectInfo {
 }
 
 func (tc *testContext) getObject(objectName, versionID string, needError bool) (*data.ObjectInfo, []byte) {
-	objInfo, err := tc.layer.GetObjectInfo(tc.ctx, &HeadObjectParams{
+	headPrm := &HeadObjectParams{
 		BktInfo:   tc.bktInfo,
 		Object:    objectName,
 		VersionID: versionID,
-	})
+	}
+	objInfo, err := tc.layer.GetObjectInfo(tc.ctx, headPrm)
 	if needError {
 		require.Error(tc.t, err)
 		return nil, nil
 	}
 	require.NoError(tc.t, err)
 
-	content := bytes.NewBuffer(nil)
-	err = tc.layer.GetObject(tc.ctx, &GetObjectParams{
+	objPayload, err := tc.layer.GetObject(tc.ctx, &GetObjectParams{
 		ObjectInfo: objInfo,
-		Writer:     content,
+		Versioned:  headPrm.Versioned(),
 		BucketInfo: tc.bktInfo,
 	})
 	require.NoError(tc.t, err)
 
-	return objInfo, content.Bytes()
+	payload, err := io.ReadAll(objPayload)
+	require.NoError(tc.t, err)
+
+	return objInfo, payload
 }
 
 func (tc *testContext) deleteObject(objectName, versionID string, settings *data.BucketSettings) {
@@ -140,13 +144,13 @@ func prepareContext(t *testing.T, cachesConfig ...*CachesConfig) *testContext {
 	bearerToken := bearertest.Token()
 	require.NoError(t, bearerToken.Sign(key.PrivateKey))
 
-	ctx := context.WithValue(context.Background(), api.BoxData, &accessbox.Box{
+	ctx := context.WithValue(context.Background(), middleware.BoxData, &accessbox.Box{
 		Gate: &accessbox.GateData{
 			BearerToken: &bearerToken,
 			GateKey:     key.PublicKey(),
 		},
 	})
-	tp := NewTestFrostFS()
+	tp := NewTestFrostFS(key)
 
 	bktName := "testbucket1"
 	bktID, err := tp.CreateContainer(ctx, PrmContainerCreate{

api/max_clients.go

@@ -1,60 +0,0 @@
-package api
-
-import (
-	"net/http"
-	"time"
-
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
-)
-
-type (
-	// MaxClients provides HTTP handler wrapper with the client limit.
-	MaxClients interface {
-		Handle(http.HandlerFunc) http.HandlerFunc
-	}
-
-	maxClients struct {
-		pool    chan struct{}
-		timeout time.Duration
-	}
-)
-
-const defaultRequestDeadline = time.Second * 30
-
-// NewMaxClientsMiddleware returns MaxClients interface with handler wrapper based on
-// the provided count and the timeout limits.
-func NewMaxClientsMiddleware(count int, timeout time.Duration) MaxClients {
-	if timeout <= 0 {
-		timeout = defaultRequestDeadline
-	}
-
-	return &maxClients{
-		pool:    make(chan struct{}, count),
-		timeout: timeout,
-	}
-}
-
-// Handler wraps HTTP handler function with logic limiting access to it.
-func (m *maxClients) Handle(f http.HandlerFunc) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		if m.pool == nil {
-			f.ServeHTTP(w, r)
-			return
-		}
-
-		deadline := time.NewTimer(m.timeout)
-		defer deadline.Stop()
-
-		select {
-		case m.pool <- struct{}{}:
-			defer func() { <-m.pool }()
-			f.ServeHTTP(w, r)
-		case <-deadline.C:
-			// Send a http timeout message
-			WriteErrorResponse(w, GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrOperationTimedOut))
-			return
-		case <-r.Context().Done():
-			return
-		}
-	}
-}

api/middleware/auth.go

@@ -1,4 +1,4 @@
-package api
+package middleware
 
 import (
 	"context"
@@ -6,29 +6,29 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
-	"github.com/gorilla/mux"
 	"go.uber.org/zap"
 )
 
 // KeyWrapper is wrapper for context keys.
 type KeyWrapper string
 
+// AuthHeaders is a wrapper for authentication headers of a request.
+var AuthHeaders = KeyWrapper("__context_auth_headers_key")
+
 // BoxData is an ID used to store accessbox.Box in a context.
 var BoxData = KeyWrapper("__context_box_key")
 
 // ClientTime is an ID used to store client time.Time in a context.
 var ClientTime = KeyWrapper("__context_client_time")
 
-// AuthMiddleware adds user authentication via center to router using log for logging.
-func AuthMiddleware(log *zap.Logger, center auth.Center) mux.MiddlewareFunc {
+func Auth(center auth.Center, log *zap.Logger) Func {
 	return func(h http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			var ctx context.Context
+			ctx := r.Context()
 			box, err := center.Authenticate(r)
 			if err != nil {
 				if err == auth.ErrNoAuthorizationHeader {
 					reqLogOrDefault(ctx, log).Debug("couldn't receive access box for gate key, random key will be used")
-					ctx = r.Context()
 				} else {
 					reqLogOrDefault(ctx, log).Error("failed to pass authentication", zap.Error(err))
 					if _, ok := err.(errors.Error); !ok {
@@ -38,21 +38,14 @@ func AuthMiddleware(log *zap.Logger, center auth.Center) mux.MiddlewareFunc {
 					return
 				}
 			} else {
-				ctx = context.WithValue(r.Context(), BoxData, box.AccessBox)
+				ctx = context.WithValue(ctx, BoxData, box.AccessBox)
 				if !box.ClientTime.IsZero() {
 					ctx = context.WithValue(ctx, ClientTime, box.ClientTime)
 				}
+				ctx = context.WithValue(ctx, AuthHeaders, box.AuthHeaders)
 			}
 
 			h.ServeHTTP(w, r.WithContext(ctx))
 		})
 	}
 }
-
-func reqLogOrDefault(ctx context.Context, log *zap.Logger) *zap.Logger {
-	reqLog := GetReqLog(ctx)
-	if reqLog != nil {
-		return reqLog
-	}
-	return log
-}

api/middleware/metrics.go

@@ -1,4 +1,4 @@
-package api
+package middleware
 
 import (
 	"context"
@@ -9,12 +9,102 @@ import (
 	"sync/atomic"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
+	"go.uber.org/zap"
 )
 
-func RequestTypeFromAPI(api string) metrics.RequestType {
+type (
+	UsersStat interface {
+		Update(user, bucket, cnrID string, reqType int, in, out uint64)
+	}
+
+	readCounter struct {
+		io.ReadCloser
+		countBytes uint64
+	}
+
+	writeCounter struct {
+		http.ResponseWriter
+		countBytes uint64
+	}
+
+	responseWrapper struct {
+		sync.Once
+		http.ResponseWriter
+
+		statusCode int
+		startTime  time.Time
+	}
+
+	// BucketResolveFunc is a func to resolve bucket info by name.
+	BucketResolveFunc func(ctx context.Context, bucket string) (*data.BucketInfo, error)
+
+	// cidResolveFunc is a func to resolve CID in Stats handler.
+	cidResolveFunc func(ctx context.Context, reqInfo *ReqInfo) (cnrID string)
+)
+
+const systemPath = "/system"
+
+// Metrics wraps http handler for api with basic statistics collection.
+func Metrics(log *zap.Logger, resolveBucket BucketResolveFunc, appMetrics *metrics.AppMetrics) Func {
+	return func(h http.Handler) http.Handler {
+		return stats(h.ServeHTTP, resolveCID(log, resolveBucket), appMetrics)
+	}
+}
+
+// Stats is a handler that update metrics.
+func stats(f http.HandlerFunc, resolveCID cidResolveFunc, appMetrics *metrics.AppMetrics) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		reqInfo := GetReqInfo(r.Context())
+
+		appMetrics.Statistic().CurrentS3RequestsInc(reqInfo.API)
+		defer appMetrics.Statistic().CurrentS3RequestsDec(reqInfo.API)
+
+		in := &readCounter{ReadCloser: r.Body}
+		out := &writeCounter{ResponseWriter: w}
+
+		r.Body = in
+
+		statsWriter := &responseWrapper{
+			ResponseWriter: out,
+			startTime:      time.Now(),
+		}
+
+		f(statsWriter, r)
+
+		// Time duration in secs since the call started.
+		// We don't need to do nanosecond precision here
+		// simply for the fact that it is not human-readable.
+		durationSecs := time.Since(statsWriter.startTime).Seconds()
+
+		user := resolveUser(r.Context())
+		cnrID := resolveCID(r.Context(), reqInfo)
+		appMetrics.Update(user, reqInfo.BucketName, cnrID, requestTypeFromAPI(reqInfo.API), in.countBytes, out.countBytes)
+
+		code := statsWriter.statusCode
+		// A successful request has a 2xx response code
+		successReq := code >= http.StatusOK && code < http.StatusMultipleChoices
+		if !strings.HasSuffix(r.URL.Path, systemPath) {
+			appMetrics.Statistic().TotalS3RequestsInc(reqInfo.API)
+			if !successReq && code != 0 {
+				appMetrics.Statistic().TotalS3ErrorsInc(reqInfo.API)
+			}
+		}
+
+		if r.Method == http.MethodGet {
+			// Increment the prometheus http request response histogram with appropriate label
+			appMetrics.Statistic().RequestDurationsUpdate(reqInfo.API, durationSecs)
+		}
+
+		appMetrics.Statistic().TotalInputBytesAdd(in.countBytes)
+		appMetrics.Statistic().TotalOutputBytesAdd(out.countBytes)
+	}
+}
+
+func requestTypeFromAPI(api string) metrics.RequestType {
 	switch api {
 	case "Options", "HeadObject", "HeadBucket":
 		return metrics.HEADRequest
@@ -43,83 +133,20 @@ func RequestTypeFromAPI(api string) metrics.RequestType {
 	}
 }
 
-type (
-	UsersStat interface {
-		Update(user, bucket, cnrID string, reqType int, in, out uint64)
+// resolveCID forms CIDResolveFunc using BucketResolveFunc.
+func resolveCID(log *zap.Logger, resolveBucket BucketResolveFunc) cidResolveFunc {
+	return func(ctx context.Context, reqInfo *ReqInfo) (cnrID string) {
+		if reqInfo.BucketName == "" || reqInfo.API == "CreateBucket" || reqInfo.API == "" {
+			return ""
 		}
 
-	readCounter struct {
-		io.ReadCloser
-		countBytes uint64
+		bktInfo, err := resolveBucket(ctx, reqInfo.BucketName)
+		if err != nil {
+			reqLogOrDefault(ctx, log).Debug("failed to resolve CID", zap.Error(err))
+			return ""
 		}
 
-	writeCounter struct {
-		http.ResponseWriter
-		countBytes uint64
-	}
-
-	responseWrapper struct {
-		sync.Once
-		http.ResponseWriter
-
-		statusCode int
-		startTime  time.Time
-	}
-)
-
-const systemPath = "/system"
-
-//var apiStatMetrics = metrics.newApiStatMetrics()
-
-// CIDResolveFunc is a func to resolve CID in Stats handler.
-type CIDResolveFunc func(ctx context.Context, reqInfo *ReqInfo) (cnrID string)
-
-// Stats is a handler that update metrics.
-func Stats(f http.HandlerFunc, resolveCID CIDResolveFunc, appMetrics *metrics.AppMetrics) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		reqInfo := GetReqInfo(r.Context())
-
-		appMetrics.Statistic().CurrentS3RequestsInc(reqInfo.API)
-		defer appMetrics.Statistic().CurrentS3RequestsDec(reqInfo.API)
-
-		in := &readCounter{ReadCloser: r.Body}
-		out := &writeCounter{ResponseWriter: w}
-
-		r.Body = in
-
-		statsWriter := &responseWrapper{
-			ResponseWriter: out,
-			startTime:      time.Now(),
-		}
-
-		f(statsWriter, r)
-
-		// Time duration in secs since the call started.
-		// We don't need to do nanosecond precision here
-		// simply for the fact that it is not human-readable.
-		durationSecs := time.Since(statsWriter.startTime).Seconds()
-
-		user := resolveUser(r.Context())
-		cnrID := resolveCID(r.Context(), reqInfo)
-		appMetrics.Update(user, reqInfo.BucketName, cnrID, RequestTypeFromAPI(reqInfo.API), in.countBytes, out.countBytes)
-
-		code := statsWriter.statusCode
-		// A successful request has a 2xx response code
-		successReq := code >= http.StatusOK && code < http.StatusMultipleChoices
-		if !strings.HasSuffix(r.URL.Path, systemPath) {
-			appMetrics.Statistic().TotalS3RequestsInc(reqInfo.API)
-			if !successReq && code != 0 {
-				appMetrics.Statistic().TotalS3ErrorsInc(reqInfo.API)
-			}
-		}
-
-		if r.Method == http.MethodGet {
-			// Increment the prometheus http request response histogram with appropriate label
-			appMetrics.Statistic().RequestDurationsUpdate(reqInfo.API, durationSecs)
-		}
-
-		appMetrics.Statistic().TotalInputBytesAdd(in.countBytes)
-		appMetrics.Statistic().TotalOutputBytesAdd(out.countBytes)
+		return bktInfo.CID.EncodeToString()
 	}
 }
 

api/middleware/middleware.go

@@ -0,0 +1,27 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+
+	"go.uber.org/zap"
+)
+
+type Func func(h http.Handler) http.Handler
+
+func WrapHandler(handler http.HandlerFunc) Func {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			handler(w, r)
+			h.ServeHTTP(w, r)
+		})
+	}
+}
+
+func reqLogOrDefault(ctx context.Context, log *zap.Logger) *zap.Logger {
+	reqLog := GetReqLog(ctx)
+	if reqLog != nil {
+		return reqLog
+	}
+	return log
+}

api/middleware/reqinfo.go

@@ -1,4 +1,4 @@
-package api
+package middleware
 
 import (
 	"context"
@@ -9,8 +9,10 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/gorilla/mux"
+	"github.com/go-chi/chi/v5"
+	"github.com/google/uuid"
 	"go.uber.org/zap"
+	"google.golang.org/grpc/metadata"
 )
 
 type (
@@ -41,23 +43,29 @@ type (
 		Object string
 		Method string
 	}
-)
 
-// Key used for custom key/value in context.
-type contextKeyType string
+	// Key used for custom key/value in context.
+	contextKeyType string
+)
 
 const (
 	ctxRequestInfo   = contextKeyType("FrostFS-S3-GW")
 	ctxRequestLogger = contextKeyType("FrostFS-S3-GW-Logger")
 )
 
+const HdrAmzRequestID = "x-amz-request-id"
+
+const (
+	BucketURLPrm = "bucket"
+)
+
+var deploymentID = uuid.Must(uuid.NewRandom())
+
 var (
 	// De-facto standard header keys.
 	xForwardedFor = http.CanonicalHeaderKey("X-Forwarded-For")
 	xRealIP       = http.CanonicalHeaderKey("X-Real-IP")
-)
 
-var (
 	// RFC7239 defines a new "Forwarded: " header designed to replace the
 	// existing use of X-Forwarded-* headers.
 	// e.g. Forwarded: for=192.0.2.60;proto=https;by=203.0.113.43.
@@ -67,68 +75,6 @@ var (
 	forRegex = regexp.MustCompile(`(?i)(?:for=)([^(;|, )]+)(.*)`)
 )
 
-// GetSourceIP retrieves the IP from the X-Forwarded-For, X-Real-IP and RFC7239
-// Forwarded headers (in that order), falls back to r.RemoteAddr when everything
-// else fails.
-func GetSourceIP(r *http.Request) string {
-	var addr string
-
-	if fwd := r.Header.Get(xForwardedFor); fwd != "" {
-		// Only grabs the first (client) address. Note that '192.168.0.1,
-		// 10.1.1.1' is a valid key for X-Forwarded-For where addresses after
-		// the first one may represent forwarding proxies earlier in the chain.
-		s := strings.Index(fwd, ", ")
-		if s == -1 {
-			s = len(fwd)
-		}
-		addr = fwd[:s]
-	} else if fwd := r.Header.Get(xRealIP); fwd != "" {
-		// X-Real-IP should only contain one IP address (the client making the
-		// request).
-		addr = fwd
-	} else if fwd := r.Header.Get(forwarded); fwd != "" {
-		// match should contain at least two elements if the protocol was
-		// specified in the Forwarded header. The first element will always be
-		// the 'for=' capture, which we ignore. In the case of multiple IP
-		// addresses (for=8.8.8.8, 8.8.4.4, 172.16.1.20 is valid) we only
-		// extract the first, which should be the client IP.
-		if match := forRegex.FindStringSubmatch(fwd); len(match) > 1 {
-			// IPv6 addresses in Forwarded headers are quoted-strings. We strip
-			// these quotes.
-			addr = strings.Trim(match[1], `"`)
-		}
-	}
-
-	if addr != "" {
-		return addr
-	}
-
-	// Default to remote address if headers not set.
-	addr, _, _ = net.SplitHostPort(r.RemoteAddr)
-	return addr
-}
-
-func prepareReqInfo(w http.ResponseWriter, r *http.Request) *ReqInfo {
-	vars := mux.Vars(r)
-	bucket := vars["bucket"]
-	object, err := url.PathUnescape(vars["object"])
-	if err != nil {
-		object = vars["object"]
-	}
-	prefix, err := url.QueryUnescape(vars["prefix"])
-	if err != nil {
-		prefix = vars["prefix"]
-	}
-	if prefix != "" {
-		object = prefix
-	}
-	return NewReqInfo(w, r, ObjectRequest{
-		Bucket: bucket,
-		Object: object,
-		Method: mux.CurrentRoute(r).GetName(),
-	})
-}
-
 // NewReqInfo returns new ReqInfo based on parameters.
 func NewReqInfo(w http.ResponseWriter, r *http.Request, req ObjectRequest) *ReqInfo {
 	return &ReqInfo{
@@ -136,7 +82,7 @@ func NewReqInfo(w http.ResponseWriter, r *http.Request, req ObjectRequest) *ReqI
 		BucketName:   req.Bucket,
 		ObjectName:   req.Object,
 		UserAgent:    r.UserAgent(),
-		RemoteHost:   GetSourceIP(r),
+		RemoteHost:   getSourceIP(r),
 		RequestID:    GetRequestID(w),
 		DeploymentID: deploymentID.String(),
 		URL:          r.URL,
@@ -187,6 +133,18 @@ func (r *ReqInfo) GetTags() []KeyVal {
 	return append([]KeyVal(nil), r.tags...)
 }
 
+// GetRequestID returns the request ID from the response writer or the context.
+func GetRequestID(v interface{}) string {
+	switch t := v.(type) {
+	case context.Context:
+		return GetReqInfo(t).RequestID
+	case http.ResponseWriter:
+		return t.Header().Get(HdrAmzRequestID)
+	default:
+		panic("unknown type")
+	}
+}
+
 // SetReqInfo sets ReqInfo in the context.
 func SetReqInfo(ctx context.Context, req *ReqInfo) context.Context {
 	if ctx == nil {
@@ -224,3 +182,120 @@ func GetReqLog(ctx context.Context) *zap.Logger {
 	}
 	return nil
 }
+
+func Request(log *zap.Logger) Func {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			// generate random UUIDv4
+			id, _ := uuid.NewRandom()
+
+			// set request id into response header
+			// also we have to set request id here
+			// to be able to get it in NewReqInfo
+			w.Header().Set(HdrAmzRequestID, id.String())
+
+			// set request info into context
+			// bucket name and object will be set in reqInfo later (limitation of go-chi)
+			reqInfo := NewReqInfo(w, r, ObjectRequest{})
+			r = r.WithContext(SetReqInfo(r.Context(), reqInfo))
+
+			// set request id into gRPC meta header
+			r = r.WithContext(metadata.AppendToOutgoingContext(
+				r.Context(), HdrAmzRequestID, reqInfo.RequestID,
+			))
+
+			reqLogger := log.With(zap.String("request_id", reqInfo.RequestID))
+			r = r.WithContext(SetReqLogger(r.Context(), reqLogger))
+
+			reqLogger.Info("request start", zap.String("host", r.Host),
+				zap.String("remote_host", reqInfo.RemoteHost))
+
+			// continue execution
+			h.ServeHTTP(w, r)
+		})
+	}
+}
+
+// AddBucketName adds bucket name to ReqInfo from context.
+func AddBucketName(l *zap.Logger) Func {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			ctx := r.Context()
+
+			reqInfo := GetReqInfo(ctx)
+			reqInfo.BucketName = chi.URLParam(r, BucketURLPrm)
+
+			reqLogger := reqLogOrDefault(ctx, l)
+			r = r.WithContext(SetReqLogger(ctx, reqLogger.With(zap.String("bucket", reqInfo.BucketName))))
+
+			h.ServeHTTP(w, r)
+		})
+	}
+}
+
+// AddObjectName adds objects name to ReqInfo from context.
+func AddObjectName(l *zap.Logger) Func {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			ctx := r.Context()
+			reqInfo := GetReqInfo(ctx)
+
+			rctx := chi.RouteContext(ctx)
+			// trim leading slash (always present)
+			obj := rctx.RoutePath[1:]
+
+			object, err := url.PathUnescape(obj)
+			if err != nil {
+				object = obj
+			}
+
+			reqInfo.ObjectName = object
+
+			reqLogger := reqLogOrDefault(ctx, l)
+			r = r.WithContext(SetReqLogger(ctx, reqLogger.With(zap.String("object", reqInfo.ObjectName))))
+
+			h.ServeHTTP(w, r)
+		})
+	}
+}
+
+// getSourceIP retrieves the IP from the X-Forwarded-For, X-Real-IP and RFC7239
+// Forwarded headers (in that order), falls back to r.RemoteAddr when everything
+// else fails.
+func getSourceIP(r *http.Request) string {
+	var addr string
+
+	if fwd := r.Header.Get(xForwardedFor); fwd != "" {
+		// Only grabs the first (client) address. Note that '192.168.0.1,
+		// 10.1.1.1' is a valid key for X-Forwarded-For where addresses after
+		// the first one may represent forwarding proxies earlier in the chain.
+		s := strings.Index(fwd, ", ")
+		if s == -1 {
+			s = len(fwd)
+		}
+		addr = fwd[:s]
+	} else if fwd := r.Header.Get(xRealIP); fwd != "" {
+		// X-Real-IP should only contain one IP address (the client making the
+		// request).
+		addr = fwd
+	} else if fwd := r.Header.Get(forwarded); fwd != "" {
+		// match should contain at least two elements if the protocol was
+		// specified in the Forwarded header. The first element will always be
+		// the 'for=' capture, which we ignore. In the case of multiple IP
+		// addresses (for=8.8.8.8, 8.8.4.4, 172.16.1.20 is valid) we only
+		// extract the first, which should be the client IP.
+		if match := forRegex.FindStringSubmatch(fwd); len(match) > 1 {
+			// IPv6 addresses in Forwarded headers are quoted-strings. We strip
+			// these quotes.
+			addr = strings.Trim(match[1], `"`)
+		}
+	}
+
+	if addr != "" {
+		return addr
+	}
+
+	// Default to remote address if headers not set.
+	addr, _, _ = net.SplitHostPort(r.RemoteAddr)
+	return addr
+}

api/middleware/response.go

@@ -1,4 +1,4 @@
-package api
+package middleware
 
 import (
 	"bytes"
@@ -6,10 +6,11 @@ import (
 	"fmt"
 	"net/http"
 	"strconv"
+	"sync"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
-	"github.com/google/uuid"
+	"go.uber.org/zap"
 )
 
 type (
@@ -34,19 +35,26 @@ type (
 		// Underlying HTTP status code for the returned error.
 		StatusCode int `xml:"-" json:"-"`
 	}
+
+	// mimeType represents various MIME types used in API responses.
+	mimeType string
 )
 
 const (
+
+	// MimeNone means no response type.
+	MimeNone mimeType = ""
+
+	// MimeXML means response type is XML.
+	MimeXML mimeType = "application/xml"
+
 	hdrServerInfo    = "Server"
 	hdrAcceptRanges  = "Accept-Ranges"
 	hdrContentType   = "Content-Type"
 	hdrContentLength = "Content-Length"
 	hdrRetryAfter    = "Retry-After"
 
-	hdrAmzCopySource = "X-Amz-Copy-Source"
-
 	// Response request id.
-	hdrAmzRequestID = "x-amz-request-id"
 
 	// hdrSSE is the general AWS SSE HTTP header key.
 	hdrSSE = "X-Amz-Server-Side-Encryption"
@@ -61,8 +69,6 @@ const (
 )
 
 var (
-	deploymentID, _ = uuid.NewRandom()
-
 	xmlHeader = []byte(xml.Header)
 )
 
@@ -140,16 +146,6 @@ func WriteErrorResponseNoHeader(w http.ResponseWriter, reqInfo *ReqInfo, err err
 	WriteResponseBody(w, encodedErrorResponse)
 }
 
-// If none of the http routes match respond with appropriate errors.
-func errorResponseHandler(w http.ResponseWriter, r *http.Request) {
-	desc := fmt.Sprintf("Unknown API request at %s", r.URL.Path)
-	WriteErrorResponse(w, GetReqInfo(r.Context()), errors.Error{
-		Code:           "UnknownAPIRequest",
-		Description:    desc,
-		HTTPStatusCode: http.StatusBadRequest,
-	})
-}
-
 // Write http common headers.
 func setCommonHeaders(w http.ResponseWriter) {
 	w.Header().Set(hdrServerInfo, version.Server)
@@ -280,3 +276,56 @@ func getAPIErrorResponse(info *ReqInfo, err error) ErrorResponse {
 		HostID:     info.DeploymentID,
 	}
 }
+
+type logResponseWriter struct {
+	sync.Once
+	http.ResponseWriter
+
+	statusCode int
+}
+
+func (lrw *logResponseWriter) WriteHeader(code int) {
+	lrw.Do(func() {
+		lrw.statusCode = code
+		lrw.ResponseWriter.WriteHeader(code)
+	})
+}
+
+func (lrw *logResponseWriter) Flush() {
+	if f, ok := lrw.ResponseWriter.(http.Flusher); ok {
+		f.Flush()
+	}
+}
+
+func LogSuccessResponse(l *zap.Logger) Func {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			lw := &logResponseWriter{ResponseWriter: w}
+
+			// here reqInfo doesn't contain bucket name and object name
+
+			// pass execution:
+			h.ServeHTTP(lw, r)
+
+			// here reqInfo contains bucket name and object name because of
+			// addBucketName and addObjectName middlewares
+
+			// Ignore >400 status codes
+			if lw.statusCode >= http.StatusBadRequest {
+				return
+			}
+
+			ctx := r.Context()
+			reqLogger := reqLogOrDefault(ctx, l)
+			reqInfo := GetReqInfo(ctx)
+
+			reqLogger.Info("request end",
+				zap.String("method", reqInfo.API),
+				zap.String("bucket", reqInfo.BucketName),
+				zap.String("object", reqInfo.ObjectName),
+				zap.Int("status", lw.statusCode),
+				zap.String("description", http.StatusText(lw.statusCode)),
+			)
+		})
+	}
+}

api/middleware/tracing.go

@@ -1,4 +1,4 @@
-package api
+package middleware
 
 import (
 	"context"
@@ -6,15 +6,14 @@ import (
 	"sync"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
-	"github.com/gorilla/mux"
 	"go.opentelemetry.io/otel/attribute"
 	semconv "go.opentelemetry.io/otel/semconv/v1.18.0"
 	"go.opentelemetry.io/otel/trace"
 )
 
-// TracingMiddleware adds tracing support for requests.
+// Tracing adds tracing support for requests.
 // Must be placed after prepareRequest middleware.
-func TracingMiddleware() mux.MiddlewareFunc {
+func Tracing() Func {
 	return func(h http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			appCtx, span := StartHTTPServerSpan(r, "REQUEST S3")

api/router.go

@@ -2,16 +2,17 @@ package api
 
 import (
 	"context"
+	"fmt"
 	"net/http"
-	"sync"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3middleware "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
-	"github.com/google/uuid"
-	"github.com/gorilla/mux"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
 	"go.uber.org/zap"
-	"google.golang.org/grpc/metadata"
 )
 
 type (
@@ -86,554 +87,301 @@ type (
 
 		ResolveBucket(ctx context.Context, bucket string) (*data.BucketInfo, error)
 	}
-
-	// mimeType represents various MIME types used in API responses.
-	mimeType string
-
-	logResponseWriter struct {
-		sync.Once
-		http.ResponseWriter
-
-		statusCode int
-	}
 )
 
-const (
-	// SlashSeparator -- slash separator.
-	SlashSeparator = "/"
+func AttachChi(api *chi.Mux, domains []string, throttle middleware.ThrottleOpts, h Handler, center auth.Center, log *zap.Logger, appMetrics *metrics.AppMetrics) {
+	api.Use(
+		s3middleware.Request(log),
+		middleware.ThrottleWithOpts(throttle),
+		middleware.Recoverer,
+		s3middleware.Tracing(),
+		s3middleware.Metrics(log, h.ResolveBucket, appMetrics),
+		s3middleware.LogSuccessResponse(log),
+		s3middleware.Auth(center, log),
+	)
 
-	// MimeNone means no response type.
-	MimeNone mimeType = ""
+	defaultRouter := chi.NewRouter()
+	defaultRouter.Mount(fmt.Sprintf("/{%s}", s3middleware.BucketURLPrm), bucketRouter(h, log))
+	defaultRouter.Get("/", named("ListBuckets", h.ListBucketsHandler))
 
-	// MimeXML means response type is XML.
-	MimeXML mimeType = "application/xml"
-)
+	hr := NewHostBucketRouter("bucket")
+	hr.Default(defaultRouter)
+	for _, domain := range domains {
+		hr.Map(domain, bucketRouter(h, log))
+	}
+	api.Mount("/", hr)
 
-var _ = logSuccessResponse
+	attachErrorHandler(api)
+}
 
-func (lrw *logResponseWriter) WriteHeader(code int) {
-	lrw.Do(func() {
-		lrw.statusCode = code
-		lrw.ResponseWriter.WriteHeader(code)
+func named(name string, handlerFunc http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		reqInfo := s3middleware.GetReqInfo(r.Context())
+		reqInfo.API = name
+		handlerFunc.ServeHTTP(w, r)
+	}
+}
+
+// If none of the http routes match respond with appropriate errors.
+func errorResponseHandler(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	reqInfo := s3middleware.GetReqInfo(ctx)
+
+	desc := fmt.Sprintf("Unknown API request at %s", r.URL.Path)
+	s3middleware.WriteErrorResponse(w, reqInfo, errors.Error{
+		Code:           "UnknownAPIRequest",
+		Description:    desc,
+		HTTPStatusCode: http.StatusBadRequest,
 	})
-}
 
-func (lrw *logResponseWriter) Flush() {
-	if f, ok := lrw.ResponseWriter.(http.Flusher); ok {
-		f.Flush()
+	if log := s3middleware.GetReqLog(ctx); log != nil {
+		log.Error("request unmatched", zap.String("method", reqInfo.API))
 	}
 }
 
-func prepareRequest(log *zap.Logger) mux.MiddlewareFunc {
-	return func(h http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			// generate random UUIDv4
-			id, _ := uuid.NewRandom()
-
-			// set request id into response header
-			// also we have to set request id here
-			// to be able to get it in prepareReqInfo
-			w.Header().Set(hdrAmzRequestID, id.String())
-
-			// set request info into context
-			reqInfo := prepareReqInfo(w, r)
-			r = r.WithContext(SetReqInfo(r.Context(), reqInfo))
-
-			// set request id into gRPC meta header
-			r = r.WithContext(metadata.AppendToOutgoingContext(
-				r.Context(), hdrAmzRequestID, reqInfo.RequestID,
-			))
-
-			// set request scoped child logger into context
-			additionalFields := []zap.Field{zap.String("request_id", reqInfo.RequestID),
-				zap.String("method", reqInfo.API), zap.String("bucket", reqInfo.BucketName)}
-
-			if isObjectRequest(reqInfo) {
-				additionalFields = append(additionalFields, zap.String("object", reqInfo.ObjectName))
-			}
-			reqLogger := log.With(additionalFields...)
-
-			r = r.WithContext(SetReqLogger(r.Context(), reqLogger))
-
-			reqLogger.Info("request start", zap.String("host", r.Host),
-				zap.String("remote_host", reqInfo.RemoteHost))
-
-			// continue execution
-			h.ServeHTTP(w, r)
-		})
-	}
-}
-
-var objectMethods = []string{
-	"HeadObject", "GetObject", "DeleteObject", "PutObject", "PostObject", "CopyObject",
-	"CreateMultipartUpload", "UploadPartCopy", "UploadPart", "ListObjectParts",
-	"CompleteMultipartUpload", "AbortMultipartUpload",
-	"PutObjectACL", "GetObjectACL",
-	"PutObjectTagging", "GetObjectTagging", "DeleteObjectTagging",
-	"PutObjectRetention", "GetObjectRetention", "PutObjectLegalHold", "getobjectlegalhold",
-	"SelectObjectContent", "GetObjectAttributes",
-}
-
-func isObjectRequest(info *ReqInfo) bool {
-	for _, method := range objectMethods {
-		if info.API == method {
-			return true
-		}
-	}
-	return false
-}
-
-func appendCORS(handler Handler) mux.MiddlewareFunc {
-	return func(h http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			handler.AppendCORSHeaders(w, r)
-			h.ServeHTTP(w, r)
-		})
-	}
-}
-
-// BucketResolveFunc is a func to resolve bucket info by name.
-type BucketResolveFunc func(ctx context.Context, bucket string) (*data.BucketInfo, error)
-
-// metricsMiddleware wraps http handler for api with basic statistics collection.
-func metricsMiddleware(log *zap.Logger, resolveBucket BucketResolveFunc, appMetrics *metrics.AppMetrics) mux.MiddlewareFunc {
-	return func(h http.Handler) http.Handler {
-		return Stats(h.ServeHTTP, resolveCID(log, resolveBucket), appMetrics)
-	}
-}
-
-// resolveCID forms CIDResolveFunc using BucketResolveFunc.
-func resolveCID(log *zap.Logger, resolveBucket BucketResolveFunc) CIDResolveFunc {
-	return func(ctx context.Context, reqInfo *ReqInfo) (cnrID string) {
-		if reqInfo.BucketName == "" || reqInfo.API == "CreateBucket" || reqInfo.API == "" {
-			return ""
-		}
-
-		bktInfo, err := resolveBucket(ctx, reqInfo.BucketName)
-		if err != nil {
-			reqLogOrDefault(ctx, log).Debug("failed to resolve CID", zap.Error(err))
-			return ""
-		}
-
-		return bktInfo.CID.EncodeToString()
-	}
-}
-
-func logSuccessResponse(l *zap.Logger) mux.MiddlewareFunc {
-	return func(h http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			lw := &logResponseWriter{ResponseWriter: w}
-
-			reqLogger := reqLogOrDefault(r.Context(), l)
-
-			// pass execution:
-			h.ServeHTTP(lw, r)
-
-			// Ignore >400 status codes
-			if lw.statusCode >= http.StatusBadRequest {
-				return
-			}
-
-			reqLogger.Info("request end",
-				zap.Int("status", lw.statusCode),
-				zap.String("description", http.StatusText(lw.statusCode)))
-		})
-	}
-}
-
-// GetRequestID returns the request ID from the response writer or the context.
-func GetRequestID(v interface{}) string {
-	switch t := v.(type) {
-	case context.Context:
-		return GetReqInfo(t).RequestID
-	case http.ResponseWriter:
-		return t.Header().Get(hdrAmzRequestID)
-	default:
-		panic("unknown type")
-	}
-}
-
-func setErrorAPI(apiName string, h http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ctx := SetReqInfo(r.Context(), &ReqInfo{API: apiName})
-		h.ServeHTTP(w, r.WithContext(ctx))
-	})
-}
-
-// attachErrorHandler set NotFoundHandler and MethodNotAllowedHandler for mux.Router.
-func attachErrorHandler(api *mux.Router, log *zap.Logger, h Handler, center auth.Center, appMetrics *metrics.AppMetrics) {
-	middlewares := []mux.MiddlewareFunc{
-		AuthMiddleware(log, center),
-		metricsMiddleware(log, h.ResolveBucket, appMetrics),
-	}
-
-	var errorHandler http.Handler = http.HandlerFunc(errorResponseHandler)
-	for i := len(middlewares) - 1; i >= 0; i-- {
-		errorHandler = middlewares[i](errorHandler)
-	}
+// attachErrorHandler set NotFoundHandler and MethodNotAllowedHandler for chi.Router.
+func attachErrorHandler(api *chi.Mux) {
+	errorHandler := http.HandlerFunc(errorResponseHandler)
 
 	// If none of the routes match, add default error handler routes
-	api.NotFoundHandler = setErrorAPI("NotFound", errorHandler)
-	api.MethodNotAllowedHandler = setErrorAPI("MethodNotAllowed", errorHandler)
+	api.NotFound(named("NotFound", errorHandler))
+	api.MethodNotAllowed(named("MethodNotAllowed", errorHandler))
 }
 
-// Attach adds S3 API handlers from h to r for domains with m client limit using
-// center authentication and log logger.
-func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center auth.Center, log *zap.Logger, appMetrics *metrics.AppMetrics) {
-	api := r.PathPrefix(SlashSeparator).Subrouter()
-
-	api.Use(
-		// -- prepare request
-		prepareRequest(log),
-
-		// Attach user authentication for all S3 routes.
-		AuthMiddleware(log, center),
-
-		TracingMiddleware(),
-
-		metricsMiddleware(log, h.ResolveBucket, appMetrics),
-
-		// -- logging error requests
-		logSuccessResponse(log),
+func bucketRouter(h Handler, log *zap.Logger) chi.Router {
+	bktRouter := chi.NewRouter()
+	bktRouter.Use(
+		s3middleware.AddBucketName(log),
+		s3middleware.WrapHandler(h.AppendCORSHeaders),
 	)
 
-	attachErrorHandler(api, log, h, center, appMetrics)
+	bktRouter.Mount("/", objectRouter(h, log))
 
-	buckets := make([]*mux.Router, 0, len(domains)+1)
-	buckets = append(buckets, api.PathPrefix("/{bucket}").Subrouter())
+	bktRouter.Options("/", h.Preflight)
 
-	for _, domain := range domains {
-		buckets = append(buckets, api.Host("{bucket:.+}."+domain).Subrouter())
-	}
+	bktRouter.Head("/", named("HeadBucket", h.HeadBucketHandler))
 
-	for _, bucket := range buckets {
-		// Object operations
-		// HeadObject
-		bucket.Use(
-			// -- append CORS headers to a response for
-			appendCORS(h),
-		)
-		bucket.Methods(http.MethodOptions).HandlerFunc(
-			m.Handle(h.Preflight)).
-			Name("Options")
-		bucket.Methods(http.MethodHead).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.HeadObjectHandler)).
-			Name("HeadObject")
-		// CopyObjectPart
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").Headers(hdrAmzCopySource, "").HandlerFunc(
-			m.Handle(h.UploadPartCopy)).
-			Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").
-			Name("UploadPartCopy")
-		// PutObjectPart
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.UploadPartHandler)).
-			Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").
-			Name("UploadPart")
-		// ListParts
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.ListPartsHandler)).
-			Queries("uploadId", "{uploadId:.*}").
-			Name("ListObjectParts")
-		// CompleteMultipartUpload
-		bucket.Methods(http.MethodPost).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.CompleteMultipartUploadHandler)).
-			Queries("uploadId", "{uploadId:.*}").
-			Name("CompleteMultipartUpload")
-		// CreateMultipartUpload
-		bucket.Methods(http.MethodPost).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.CreateMultipartUploadHandler)).
-			Queries("uploads", "").
-			Name("CreateMultipartUpload")
-		// AbortMultipartUpload
-		bucket.Methods(http.MethodDelete).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.AbortMultipartUploadHandler)).
-			Queries("uploadId", "{uploadId:.*}").
-			Name("AbortMultipartUpload")
-		// ListMultipartUploads
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.ListMultipartUploadsHandler)).
-			Queries("uploads", "").
-			Name("ListMultipartUploads")
-		// GetObjectACL -- this is a dummy call.
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.GetObjectACLHandler)).
-			Queries("acl", "").
-			Name("GetObjectACL")
-		// PutObjectACL -- this is a dummy call.
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.PutObjectACLHandler)).
-			Queries("acl", "").
-			Name("PutObjectACL")
-		// GetObjectTagging
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.GetObjectTaggingHandler)).
-			Queries("tagging", "").
-			Name("GetObjectTagging")
-		// PutObjectTagging
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.PutObjectTaggingHandler)).
-			Queries("tagging", "").
-			Name("PutObjectTagging")
-		// DeleteObjectTagging
-		bucket.Methods(http.MethodDelete).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.DeleteObjectTaggingHandler)).
-			Queries("tagging", "").
-			Name("DeleteObjectTagging")
-		// SelectObjectContent
-		bucket.Methods(http.MethodPost).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.SelectObjectContentHandler)).
-			Queries("select", "").Queries("select-type", "2").
-			Name("SelectObjectContent")
-		// GetObjectRetention
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.GetObjectRetentionHandler)).
-			Queries("retention", "").
-			Name("GetObjectRetention")
-		// GetObjectLegalHold
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.GetObjectLegalHoldHandler)).
-			Queries("legal-hold", "").
-			Name("GetObjectLegalHold")
-		// GetObjectAttributes
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.GetObjectAttributesHandler)).
-			Queries("attributes", "").
-			Name("GetObjectAttributes")
-		// GetObject
-		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.GetObjectHandler)).
-			Name("GetObject")
-		// CopyObject
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").Headers(hdrAmzCopySource, "").HandlerFunc(
-			m.Handle(h.CopyObjectHandler)).
-			Name("CopyObject")
-		// PutObjectRetention
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.PutObjectRetentionHandler)).
-			Queries("retention", "").
-			Name("PutObjectRetention")
-		// PutObjectLegalHold
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.PutObjectLegalHoldHandler)).
-			Queries("legal-hold", "").
-			Name("PutObjectLegalHold")
+	// GET method handlers
+	bktRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodGet, "/", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("uploads").
+				Handler(named("ListMultipartUploads", h.ListMultipartUploadsHandler))).
+			Add(NewFilter().
+				Queries("location").
+				Handler(named("GetBucketLocation", h.GetBucketLocationHandler))).
+			Add(NewFilter().
+				Queries("policy").
+				Handler(named("GetBucketPolicy", h.GetBucketPolicyHandler))).
+			Add(NewFilter().
+				Queries("lifecycle").
+				Handler(named("GetBucketLifecycle", h.GetBucketLifecycleHandler))).
+			Add(NewFilter().
+				Queries("encryption").
+				Handler(named("GetBucketEncryption", h.GetBucketEncryptionHandler))).
+			Add(NewFilter().
+				Queries("cors").
+				Handler(named("GetBucketCors", h.GetBucketCorsHandler))).
+			Add(NewFilter().
+				Queries("acl").
+				Handler(named("GetBucketACL", h.GetBucketACLHandler))).
+			Add(NewFilter().
+				Queries("website").
+				Handler(named("GetBucketWebsite", h.GetBucketWebsiteHandler))).
+			Add(NewFilter().
+				Queries("accelerate").
+				Handler(named("GetBucketAccelerate", h.GetBucketAccelerateHandler))).
+			Add(NewFilter().
+				Queries("requestPayment").
+				Handler(named("GetBucketRequestPayment", h.GetBucketRequestPaymentHandler))).
+			Add(NewFilter().
+				Queries("logging").
+				Handler(named("GetBucketLogging", h.GetBucketLoggingHandler))).
+			Add(NewFilter().
+				Queries("replication").
+				Handler(named("GetBucketReplication", h.GetBucketReplicationHandler))).
+			Add(NewFilter().
+				Queries("tagging").
+				Handler(named("GetBucketTagging", h.GetBucketTaggingHandler))).
+			Add(NewFilter().
+				Queries("object-lock").
+				Handler(named("GetBucketObjectLockConfig", h.GetBucketObjectLockConfigHandler))).
+			Add(NewFilter().
+				Queries("versioning").
+				Handler(named("GetBucketVersioning", h.GetBucketVersioningHandler))).
+			Add(NewFilter().
+				Queries("notification").
+				Handler(named("GetBucketNotification", h.GetBucketNotificationHandler))).
+			Add(NewFilter().
+				Queries("events").
+				Handler(named("ListenBucketNotification", h.ListenBucketNotificationHandler))).
+			Add(NewFilter().
+				QueriesMatch("list-type", "2", "metadata", "true").
+				Handler(named("ListObjectsV2M", h.ListObjectsV2MHandler))).
+			Add(NewFilter().
+				QueriesMatch("list-type", "2").
+				Handler(named("ListObjectsV2", h.ListObjectsV2Handler))).
+			Add(NewFilter().
+				Queries("versions").
+				Handler(named("ListBucketObjectVersions", h.ListBucketObjectVersionsHandler))).
+			DefaultHandler(named("ListObjectsV1", h.ListObjectsV1Handler)))
+	})
 
-		// PutObject
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.PutObjectHandler)).
-			Name("PutObject")
-		// DeleteObject
-		bucket.Methods(http.MethodDelete).Path("/{object:.+}").HandlerFunc(
-			m.Handle(h.DeleteObjectHandler)).
-			Name("DeleteObject")
+	// PUT method handlers
+	bktRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodPut, "/", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("cors").
+				Handler(named("PutBucketCors", h.PutBucketCorsHandler))).
+			Add(NewFilter().
+				Queries("acl").
+				Handler(named("PutBucketACL", h.PutBucketACLHandler))).
+			Add(NewFilter().
+				Queries("lifecycle").
+				Handler(named("PutBucketLifecycle", h.PutBucketLifecycleHandler))).
+			Add(NewFilter().
+				Queries("encryption").
+				Handler(named("PutBucketEncryption", h.PutBucketEncryptionHandler))).
+			Add(NewFilter().
+				Queries("policy").
+				Handler(named("PutBucketPolicy", h.PutBucketPolicyHandler))).
+			Add(NewFilter().
+				Queries("object-lock").
+				Handler(named("PutBucketObjectLockConfig", h.PutBucketObjectLockConfigHandler))).
+			Add(NewFilter().
+				Queries("tagging").
+				Handler(named("PutBucketTagging", h.PutBucketTaggingHandler))).
+			Add(NewFilter().
+				Queries("versioning").
+				Handler(named("PutBucketVersioning", h.PutBucketVersioningHandler))).
+			Add(NewFilter().
+				Queries("notification").
+				Handler(named("PutBucketNotification", h.PutBucketNotificationHandler))).
+			DefaultHandler(named("CreateBucket", h.CreateBucketHandler)))
+	})
 
-		// Bucket operations
-		// GetBucketLocation
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketLocationHandler)).
-			Queries("location", "").
-			Name("GetBucketLocation")
-		// GetBucketPolicy
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketPolicyHandler)).
-			Queries("policy", "").
-			Name("GetBucketPolicy")
-		// GetBucketLifecycle
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketLifecycleHandler)).
-			Queries("lifecycle", "").
-			Name("GetBucketLifecycle")
-		// GetBucketEncryption
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketEncryptionHandler)).
-			Queries("encryption", "").
-			Name("GetBucketEncryption")
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketCorsHandler)).
-			Queries("cors", "").
-			Name("GetBucketCors")
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketCorsHandler)).
-			Queries("cors", "").
-			Name("PutBucketCors")
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketCorsHandler)).
-			Queries("cors", "").
-			Name("DeleteBucketCors")
-		// Dummy Bucket Calls
-		// GetBucketACL -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketACLHandler)).
-			Queries("acl", "").
-			Name("GetBucketACL")
-		// PutBucketACL -- this is a dummy call.
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketACLHandler)).
-			Queries("acl", "").
-			Name("PutBucketACL")
-		// GetBucketWebsiteHandler -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketWebsiteHandler)).
-			Queries("website", "").
-			Name("GetBucketWebsite")
-		// GetBucketAccelerateHandler -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketAccelerateHandler)).
-			Queries("accelerate", "").
-			Name("GetBucketAccelerate")
-		// GetBucketRequestPaymentHandler -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketRequestPaymentHandler)).
-			Queries("requestPayment", "").
-			Name("GetBucketRequestPayment")
-		// GetBucketLoggingHandler -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketLoggingHandler)).
-			Queries("logging", "").
-			Name("GetBucketLogging")
-		// GetBucketReplicationHandler -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketReplicationHandler)).
-			Queries("replication", "").
-			Name("GetBucketReplication")
-		// GetBucketTaggingHandler
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketTaggingHandler)).
-			Queries("tagging", "").
-			Name("GetBucketTagging")
-		// DeleteBucketWebsiteHandler
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketWebsiteHandler)).
-			Queries("website", "").
-			Name("DeleteBucketWebsite")
-		// DeleteBucketTaggingHandler
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketTaggingHandler)).
-			Queries("tagging", "").
-			Name("DeleteBucketTagging")
+	// POST method handlers
+	bktRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodPost, "/", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("delete").
+				Handler(named("DeleteMultipleObjects", h.DeleteMultipleObjectsHandler))).
+			// todo consider add filter to match header for defaultHandler:  hdrContentType, "multipart/form-data*"
+			DefaultHandler(named("PostObject", h.PostObject)))
+	})
 
-		// GetBucketObjectLockConfig
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketObjectLockConfigHandler)).
-			Queries("object-lock", "").
-			Name("GetBucketObjectLockConfig")
-		// GetBucketVersioning
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketVersioningHandler)).
-			Queries("versioning", "").
-			Name("GetBucketVersioning")
-		// GetBucketNotification
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.GetBucketNotificationHandler)).
-			Queries("notification", "").
-			Name("GetBucketNotification")
-		// ListenBucketNotification
-		bucket.Methods(http.MethodGet).HandlerFunc(h.ListenBucketNotificationHandler).
-			Queries("events", "{events:.*}").
-			Name("ListenBucketNotification")
-		// ListObjectsV2M
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.ListObjectsV2MHandler)).
-			Queries("list-type", "2", "metadata", "true").
-			Name("ListObjectsV2M")
-		// ListObjectsV2
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.ListObjectsV2Handler)).
-			Queries("list-type", "2").
-			Name("ListObjectsV2")
-		// ListBucketVersions
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.ListBucketObjectVersionsHandler)).
-			Queries("versions", "").
-			Name("ListBucketVersions")
-		// ListObjectsV1 (Legacy)
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(h.ListObjectsV1Handler)).
-			Name("ListObjectsV1")
-		// PutBucketLifecycle
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketLifecycleHandler)).
-			Queries("lifecycle", "").
-			Name("PutBucketLifecycle")
-		// PutBucketEncryption
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketEncryptionHandler)).
-			Queries("encryption", "").
-			Name("PutBucketEncryption")
+	// DELETE method handlers
+	bktRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodDelete, "/", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("cors").
+				Handler(named("DeleteBucketCors", h.DeleteBucketCorsHandler))).
+			Add(NewFilter().
+				Queries("website").
+				Handler(named("DeleteBucketWebsite", h.DeleteBucketWebsiteHandler))).
+			Add(NewFilter().
+				Queries("tagging").
+				Handler(named("DeleteBucketTagging", h.DeleteBucketTaggingHandler))).
+			Add(NewFilter().
+				Queries("policy").
+				Handler(named("PutBucketPolicy", h.PutBucketPolicyHandler))).
+			Add(NewFilter().
+				Queries("lifecycle").
+				Handler(named("PutBucketLifecycle", h.PutBucketLifecycleHandler))).
+			Add(NewFilter().
+				Queries("encryption").
+				Handler(named("DeleteBucketEncryption", h.DeleteBucketEncryptionHandler))).
+			DefaultHandler(named("DeleteBucket", h.DeleteBucketHandler)))
+	})
 
-		// PutBucketPolicy
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketPolicyHandler)).
-			Queries("policy", "").
-			Name("PutBucketPolicy")
+	attachErrorHandler(bktRouter)
 
-		// PutBucketObjectLockConfig
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketObjectLockConfigHandler)).
-			Queries("object-lock", "").
-			Name("PutBucketObjectLockConfig")
-		// PutBucketTaggingHandler
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketTaggingHandler)).
-			Queries("tagging", "").
-			Name("PutBucketTagging")
-		// PutBucketVersioning
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketVersioningHandler)).
-			Queries("versioning", "").
-			Name("PutBucketVersioning")
-		// PutBucketNotification
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.PutBucketNotificationHandler)).
-			Queries("notification", "").
-			Name("PutBucketNotification")
-		// CreateBucket
-		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(h.CreateBucketHandler)).
-			Name("CreateBucket")
-		// HeadBucket
-		bucket.Methods(http.MethodHead).HandlerFunc(
-			m.Handle(h.HeadBucketHandler)).
-			Name("HeadBucket")
-		// PostPolicy
-		bucket.Methods(http.MethodPost).HeadersRegexp(hdrContentType, "multipart/form-data*").HandlerFunc(
-			m.Handle(h.PostObject)).
-			Name("PostObject")
-		// DeleteMultipleObjects
-		bucket.Methods(http.MethodPost).HandlerFunc(
-			m.Handle(h.DeleteMultipleObjectsHandler)).
-			Queries("delete", "").
-			Name("DeleteMultipleObjects")
-		// DeleteBucketPolicy
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketPolicyHandler)).
-			Queries("policy", "").
-			Name("DeleteBucketPolicy")
-		// DeleteBucketLifecycle
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketLifecycleHandler)).
-			Queries("lifecycle", "").
-			Name("DeleteBucketLifecycle")
-		// DeleteBucketEncryption
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketEncryptionHandler)).
-			Queries("encryption", "").
-			Name("DeleteBucketEncryption")
-		// DeleteBucket
-		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(h.DeleteBucketHandler)).
-			Name("DeleteBucket")
-	}
-	// Root operation
-
-	// ListBuckets
-	api.Methods(http.MethodGet).Path(SlashSeparator).HandlerFunc(
-		m.Handle(h.ListBucketsHandler)).
-		Name("ListBuckets")
-
-	// S3 browser with signature v4 adds '//' for ListBuckets request, so rather
-	// than failing with UnknownAPIRequest we simply handle it for now.
-	api.Methods(http.MethodGet).Path(SlashSeparator + SlashSeparator).HandlerFunc(
-		m.Handle(h.ListBucketsHandler)).
-		Name("ListBuckets")
+	return bktRouter
+}
+
+func objectRouter(h Handler, l *zap.Logger) chi.Router {
+	objRouter := chi.NewRouter()
+	objRouter.Use(s3middleware.AddObjectName(l))
+
+	objRouter.Head("/*", named("HeadObject", h.HeadObjectHandler))
+
+	// GET method handlers
+	objRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodGet, "/*", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("uploadId").
+				Handler(named("ListParts", h.ListPartsHandler))).
+			Add(NewFilter().
+				Queries("acl").
+				Handler(named("GetObjectACL", h.GetObjectACLHandler))).
+			Add(NewFilter().
+				Queries("tagging").
+				Handler(named("GetObjectTagging", h.GetObjectTaggingHandler))).
+			Add(NewFilter().
+				Queries("retention").
+				Handler(named("GetObjectRetention", h.GetObjectRetentionHandler))).
+			Add(NewFilter().
+				Queries("legal-hold").
+				Handler(named("GetObjectLegalHold", h.GetObjectLegalHoldHandler))).
+			Add(NewFilter().
+				Queries("attributes").
+				Handler(named("GetObjectAttributes", h.GetObjectAttributesHandler))).
+			DefaultHandler(named("GetObject", h.GetObjectHandler)))
+	})
+
+	// PUT method handlers
+	objRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodPut, "/*", NewHandlerFilter().
+			Add(NewFilter().
+				Headers(AmzCopySource).
+				Queries("partNumber", "uploadId").
+				Handler(named("UploadPartCopy", h.UploadPartCopy))).
+			Add(NewFilter().
+				Queries("partNumber", "uploadId").
+				Handler(named("UploadPart", h.UploadPartHandler))).
+			Add(NewFilter().
+				Queries("acl").
+				Handler(named("PutObjectACL", h.PutObjectACLHandler))).
+			Add(NewFilter().
+				Queries("tagging").
+				Handler(named("PutObjectTagging", h.PutObjectTaggingHandler))).
+			Add(NewFilter().
+				Headers(AmzCopySource).
+				Handler(named("CopyObject", h.CopyObjectHandler))).
+			Add(NewFilter().
+				Queries("retention").
+				Handler(named("PutObjectRetention", h.PutObjectRetentionHandler))).
+			Add(NewFilter().
+				Queries("legal-hold").
+				Handler(named("PutObjectLegalHold", h.PutObjectLegalHoldHandler))).
+			DefaultHandler(named("PutObject", h.PutObjectHandler)))
+	})
+
+	// POST method handlers
+	objRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodPost, "/*", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("uploadId").
+				Handler(named("CompleteMultipartUpload", h.CompleteMultipartUploadHandler))).
+			Add(NewFilter().
+				Queries("uploads").
+				Handler(named("CreateMultipartUpload", h.CreateMultipartUploadHandler))).
+			DefaultHandler(named("SelectObjectContent", h.SelectObjectContentHandler)))
+	})
+
+	// DELETE method handlers
+	objRouter.Group(func(r chi.Router) {
+		r.Method(http.MethodDelete, "/*", NewHandlerFilter().
+			Add(NewFilter().
+				Queries("uploadId").
+				Handler(named("AbortMultipartUpload", h.AbortMultipartUploadHandler))).
+			Add(NewFilter().
+				Queries("tagging").
+				Handler(named("DeleteObjectTagging", h.DeleteObjectTaggingHandler))).
+			DefaultHandler(named("DeleteObject", h.DeleteObjectHandler)))
+	})
+
+	attachErrorHandler(objRouter)
+
+	return objRouter
 }

api/router_filter.go

@@ -0,0 +1,141 @@
+package api
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type HandlerFilters struct {
+	filters        []Filter
+	defaultHandler http.Handler
+}
+
+type Filter struct {
+	queries []Pair
+	headers []Pair
+	h       http.Handler
+}
+
+type Pair struct {
+	Key   string
+	Value string
+}
+
+func NewHandlerFilter() *HandlerFilters {
+	return &HandlerFilters{}
+}
+
+func NewFilter() *Filter {
+	return &Filter{}
+}
+
+func (hf *HandlerFilters) Add(filter *Filter) *HandlerFilters {
+	hf.filters = append(hf.filters, *filter)
+	return hf
+}
+
+// HeadersMatch adds a matcher for header values.
+// It accepts a sequence of key/value pairs. Values may define variables.
+// Panics if number of parameters is not even.
+// Supports only exact matching.
+// If the value is an empty string, it will match any value if the key is set.
+func (f *Filter) HeadersMatch(pairs ...string) *Filter {
+	length := len(pairs)
+	if length%2 != 0 {
+		panic(fmt.Errorf("filter headers: number of parameters must be multiple of 2, got %v", pairs))
+	}
+
+	for i := 0; i < length; i += 2 {
+		f.headers = append(f.headers, Pair{
+			Key:   pairs[i],
+			Value: pairs[i+1],
+		})
+	}
+
+	return f
+}
+
+// Headers is similar to HeadersMatch but accept only header keys, set value to empty string internally.
+func (f *Filter) Headers(headers ...string) *Filter {
+	for _, header := range headers {
+		f.headers = append(f.headers, Pair{
+			Key:   header,
+			Value: "",
+		})
+	}
+
+	return f
+}
+
+func (f *Filter) Handler(handler http.HandlerFunc) *Filter {
+	f.h = handler
+	return f
+}
+
+// QueriesMatch adds a matcher for URL query values.
+// It accepts a sequence of key/value pairs. Values may define variables.
+// Panics if number of parameters is not even.
+// Supports only exact matching.
+// If the value is an empty string, it will match any value if the key is set.
+func (f *Filter) QueriesMatch(pairs ...string) *Filter {
+	length := len(pairs)
+	if length%2 != 0 {
+		panic(fmt.Errorf("filter headers: number of parameters must be multiple of 2, got %v", pairs))
+	}
+
+	for i := 0; i < length; i += 2 {
+		f.queries = append(f.queries, Pair{
+			Key:   pairs[i],
+			Value: pairs[i+1],
+		})
+	}
+
+	return f
+}
+
+// Queries is similar to QueriesMatch but accept only query keys, set value to empty string internally.
+func (f *Filter) Queries(queries ...string) *Filter {
+	for _, query := range queries {
+		f.queries = append(f.queries, Pair{
+			Key:   query,
+			Value: "",
+		})
+	}
+
+	return f
+}
+
+func (hf *HandlerFilters) DefaultHandler(handler http.HandlerFunc) *HandlerFilters {
+	hf.defaultHandler = handler
+	return hf
+}
+
+func (hf *HandlerFilters) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if handler := hf.match(r); handler != nil {
+		handler.ServeHTTP(w, r)
+		return
+	}
+
+	hf.defaultHandler.ServeHTTP(w, r)
+}
+
+func (hf *HandlerFilters) match(r *http.Request) http.Handler {
+LOOP:
+	for _, filter := range hf.filters {
+		for _, header := range filter.headers {
+			hdrVals := r.Header.Values(header.Key)
+			if len(hdrVals) == 0 || header.Value != "" && header.Value != hdrVals[0] {
+				continue LOOP
+			}
+		}
+		for _, query := range filter.queries {
+			queryVal := r.URL.Query().Get(query.Key)
+			if !r.URL.Query().Has(query.Key) || query.Value != "" && query.Value != queryVal {
+				continue LOOP
+			}
+		}
+		return filter.h
+	}
+
+	return nil
+}

api/router_filter_test.go

@@ -0,0 +1,68 @@
+package api
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFilter(t *testing.T) {
+	key1, val1 := "key1", "val1"
+	key2, val2 := "key2", "val2"
+	key3, val3 := "key3", "val3"
+
+	anyVal := ""
+
+	notNilHandler := http.HandlerFunc(func(http.ResponseWriter, *http.Request) {})
+
+	t.Run("queries", func(t *testing.T) {
+		f := NewHandlerFilter().
+			Add(NewFilter().
+				QueriesMatch(key1, val1, key2, anyVal).
+				Queries(key3).
+				Handler(notNilHandler))
+
+		r, err := http.NewRequest(http.MethodGet, "https://localhost:8084", nil)
+		require.NoError(t, err)
+
+		query := make(url.Values)
+		query.Set(key1, val1)
+		query.Set(key2, val2)
+		query.Set(key3, val3)
+		r.URL.RawQuery = query.Encode()
+
+		h := f.match(r)
+		require.NotNil(t, h)
+
+		query.Set(key1, val2)
+		r.URL.RawQuery = query.Encode()
+
+		h = f.match(r)
+		require.Nil(t, h)
+	})
+
+	t.Run("headers", func(t *testing.T) {
+		f := NewHandlerFilter().
+			Add(NewFilter().
+				HeadersMatch(key1, val1, key2, anyVal).
+				Headers(key3).
+				Handler(notNilHandler))
+
+		r, err := http.NewRequest(http.MethodGet, "https://localhost:8084", nil)
+		require.NoError(t, err)
+
+		r.Header.Set(key1, val1)
+		r.Header.Set(key2, val2)
+		r.Header.Set(key3, val3)
+
+		h := f.match(r)
+		require.NotNil(t, h)
+
+		r.Header.Set(key1, val2)
+
+		h = f.match(r)
+		require.Nil(t, h)
+	})
+}

api/router_mock_test.go

@@ -0,0 +1,389 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"github.com/stretchr/testify/require"
+)
+
+type centerMock struct {
+}
+
+func (c *centerMock) Authenticate(*http.Request) (*auth.Box, error) {
+	return &auth.Box{}, nil
+}
+
+type handlerMock struct {
+	t *testing.T
+}
+
+type handlerResult struct {
+	Method  string
+	ReqInfo *middleware.ReqInfo
+}
+
+func (h *handlerMock) HeadObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteObjectTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) SelectObjectContentHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectRetentionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectLegalHoldHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectAttributesHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) CopyObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectRetentionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectLegalHoldHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "PutObject",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) DeleteObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketLocationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketPolicyHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketLifecycleHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketEncryptionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketCorsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketCorsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketCorsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketWebsiteHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketAccelerateHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketRequestPaymentHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketLoggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketReplicationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketWebsiteHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketObjectLockConfigHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketVersioningHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketNotificationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListenBucketNotificationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListObjectsV2MHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListObjectsV2Handler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "ListObjectsV2",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) ListBucketObjectVersionsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "ListObjectsV1",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) PutBucketLifecycleHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketEncryptionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketPolicyHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketObjectLockConfigHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketVersioningHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketNotificationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) CreateBucketHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) HeadBucketHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PostObject(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteMultipleObjectsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketPolicyHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketLifecycleHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketEncryptionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListBucketsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) Preflight(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) AppendCORSHeaders(http.ResponseWriter, *http.Request) {
+}
+
+func (h *handlerMock) CreateMultipartUploadHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) UploadPartHandler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "UploadPart",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) UploadPartCopy(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) CompleteMultipartUploadHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) AbortMultipartUploadHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListPartsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "ListMultipartUploads",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) ResolveBucket(context.Context, string) (*data.BucketInfo, error) {
+	return &data.BucketInfo{}, nil
+}
+
+func (h *handlerMock) writeResponse(w http.ResponseWriter, resp *handlerResult) {
+	respData, err := json.Marshal(resp)
+	require.NoError(h.t, err)
+
+	_, err = w.Write(respData)
+	require.NoError(h.t, err)
+}

api/router_test.go

@@ -0,0 +1,89 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
+)
+
+func TestRouterUploadPart(t *testing.T) {
+	chiRouter := prepareRouter(t)
+
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest(http.MethodPut, "/dkirillov/fix-object", nil)
+	query := make(url.Values)
+	query.Set("uploadId", "some-id")
+	query.Set("partNumber", "1")
+	r.URL.RawQuery = query.Encode()
+
+	chiRouter.ServeHTTP(w, r)
+	resp := readResponse(t, w)
+	require.Equal(t, "UploadPart", resp.Method)
+}
+
+func TestRouterListMultipartUploads(t *testing.T) {
+	chiRouter := prepareRouter(t)
+
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest(http.MethodGet, "/test-bucket", nil)
+	query := make(url.Values)
+	query.Set("uploads", "")
+	r.URL.RawQuery = query.Encode()
+
+	chiRouter.ServeHTTP(w, r)
+	resp := readResponse(t, w)
+	require.Equal(t, "ListMultipartUploads", resp.Method)
+}
+
+func TestRouterObjectWithSlashes(t *testing.T) {
+	chiRouter := prepareRouter(t)
+
+	bktName, objName := "dkirillov", "/fix/object"
+	target := fmt.Sprintf("/%s/%s", bktName, objName)
+
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest(http.MethodPut, target, nil)
+
+	chiRouter.ServeHTTP(w, r)
+	resp := readResponse(t, w)
+	require.Equal(t, "PutObject", resp.Method)
+	require.Equal(t, objName, resp.ReqInfo.ObjectName)
+}
+
+func prepareRouter(t *testing.T) *chi.Mux {
+	throttleOps := middleware.ThrottleOpts{
+		Limit:          10,
+		BacklogTimeout: 30 * time.Second,
+	}
+
+	handleMock := &handlerMock{t: t}
+	cntrMock := &centerMock{}
+	log := zaptest.NewLogger(t)
+	metric := &metrics.AppMetrics{}
+
+	chiRouter := chi.NewRouter()
+	AttachChi(chiRouter, nil, throttleOps, handleMock, cntrMock, log, metric)
+	return chiRouter
+}
+
+func readResponse(t *testing.T, w *httptest.ResponseRecorder) handlerResult {
+	var res handlerResult
+
+	resData, err := io.ReadAll(w.Result().Body)
+	require.NoError(t, err)
+
+	err = json.Unmarshal(resData, &res)
+	require.NoErrorf(t, err, "actual body: '%s'", string(resData))
+	return res
+}

authmate/authmate.go

@@ -11,6 +11,8 @@ import (
 	"os"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/acl"
+	sessionv2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/tokens"
@@ -105,7 +107,21 @@ type (
 		Lifetime              time.Duration
 		AwsCliCredentialsFile string
 		ContainerPolicies     ContainerPolicies
-		UpdateCreds           *UpdateOptions
+	}
+
+	// UpdateSecretOptions contains options for passing to Agent.UpdateSecret method.
+	UpdateSecretOptions struct {
+		FrostFSKey      *keys.PrivateKey
+		GatesPublicKeys []*keys.PublicKey
+		Address         oid.Address
+		GatePrivateKey  *keys.PrivateKey
+	}
+
+	tokenUpdateOptions struct {
+		frostFSKey      *keys.PrivateKey
+		gatesPublicKeys []*keys.PublicKey
+		lifetime        lifetimeOptions
+		box             *accessbox.Box
 	}
 
 	// ContainerOptions groups parameters of auth container to put the secret into.
@@ -136,8 +152,8 @@ type lifetimeOptions struct {
 
 type (
 	issuingResult struct {
-		AccessKeyID        string `json:"access_key_id"`
 		InitialAccessKeyID string `json:"initial_access_key_id"`
+		AccessKeyID        string `json:"access_key_id"`
 		SecretAccessKey    string `json:"secret_access_key"`
 		OwnerPrivateKey    string `json:"owner_private_key"`
 		WalletPublicKey    string `json:"wallet_public_key"`
@@ -237,12 +253,7 @@ func (a *Agent) IssueSecret(ctx context.Context, w io.Writer, options *IssueSecr
 		return fmt.Errorf("create tokens: %w", err)
 	}
 
-	var secret []byte
-	if options.UpdateCreds != nil {
-		secret = options.UpdateCreds.SecretAccessKey
-	}
-
-	box, secrets, err := accessbox.PackTokens(gatesData, secret)
+	box, secrets, err := accessbox.PackTokens(gatesData, nil)
 	if err != nil {
 		return fmt.Errorf("pack tokens: %w", err)
 	}
@@ -261,24 +272,15 @@ func (a *Agent) IssueSecret(ctx context.Context, w io.Writer, options *IssueSecr
 
 	creds := tokens.New(a.frostFS, secrets.EphemeralKey, cache.DefaultAccessBoxConfig(a.log))
 
-	var addr oid.Address
-	var oldAddr oid.Address
-	if options.UpdateCreds != nil {
-		oldAddr = options.UpdateCreds.Address
-		addr, err = creds.Update(ctx, oldAddr, idOwner, box, lifetime.Exp, options.GatesPublicKeys...)
-	} else {
-		addr, err = creds.Put(ctx, id, idOwner, box, lifetime.Exp, options.GatesPublicKeys...)
-		oldAddr = addr
-	}
+	addr, err := creds.Put(ctx, id, idOwner, box, lifetime.Exp, options.GatesPublicKeys...)
 	if err != nil {
 		return fmt.Errorf("failed to put creds: %w", err)
 	}
 
-	accessKeyID := addr.Container().EncodeToString() + "0" + addr.Object().EncodeToString()
-
+	accessKeyID := accessKeyIDFromAddr(addr)
 	ir := &issuingResult{
+		InitialAccessKeyID: accessKeyID,
 		AccessKeyID:        accessKeyID,
-		InitialAccessKeyID: oldAddr.Container().EncodeToString() + "0" + oldAddr.Object().EncodeToString(),
 		SecretAccessKey:    secrets.AccessKey,
 		OwnerPrivateKey:    hex.EncodeToString(secrets.EphemeralKey.Bytes()),
 		WalletPublicKey:    hex.EncodeToString(options.FrostFSKey.PublicKey().Bytes()),
@@ -309,6 +311,73 @@ func (a *Agent) IssueSecret(ctx context.Context, w io.Writer, options *IssueSecr
 	return nil
 }
 
+// UpdateSecret updates an auth token (change list of gates that can use credential), puts new cred version to the FrostFS network and writes to io.Writer a result.
+func (a *Agent) UpdateSecret(ctx context.Context, w io.Writer, options *UpdateSecretOptions) error {
+	creds := tokens.New(a.frostFS, options.GatePrivateKey, cache.DefaultAccessBoxConfig(a.log))
+
+	box, err := creds.GetBox(ctx, options.Address)
+	if err != nil {
+		return fmt.Errorf("get accessbox: %w", err)
+	}
+
+	secret, err := hex.DecodeString(box.Gate.AccessKey)
+	if err != nil {
+		return fmt.Errorf("failed to decode secret key access box: %w", err)
+	}
+
+	lifetime := getLifetimeFromGateData(box.Gate)
+	tokenOptions := tokenUpdateOptions{
+		frostFSKey:      options.FrostFSKey,
+		gatesPublicKeys: options.GatesPublicKeys,
+		lifetime:        lifetime,
+		box:             box,
+	}
+
+	gatesData, err := formTokensToUpdate(tokenOptions)
+	if err != nil {
+		return fmt.Errorf("create tokens: %w", err)
+	}
+
+	updatedBox, secrets, err := accessbox.PackTokens(gatesData, secret)
+	if err != nil {
+		return fmt.Errorf("pack tokens: %w", err)
+	}
+
+	var idOwner user.ID
+	user.IDFromKey(&idOwner, options.FrostFSKey.PrivateKey.PublicKey)
+	a.log.Info("update access cred object into FrostFS",
+		zap.Stringer("owner_tkn", idOwner))
+
+	oldAddr := options.Address
+	addr, err := creds.Update(ctx, oldAddr, idOwner, updatedBox, lifetime.Exp, options.GatesPublicKeys...)
+	if err != nil {
+		return fmt.Errorf("failed to update creds: %w", err)
+	}
+
+	ir := &issuingResult{
+		AccessKeyID:        accessKeyIDFromAddr(addr),
+		InitialAccessKeyID: accessKeyIDFromAddr(oldAddr),
+		SecretAccessKey:    secrets.AccessKey,
+		OwnerPrivateKey:    hex.EncodeToString(secrets.EphemeralKey.Bytes()),
+		WalletPublicKey:    hex.EncodeToString(options.FrostFSKey.PublicKey().Bytes()),
+		ContainerID:        addr.Container().EncodeToString(),
+	}
+
+	enc := json.NewEncoder(w)
+	enc.SetIndent("", "  ")
+	return enc.Encode(ir)
+}
+
+func getLifetimeFromGateData(gateData *accessbox.GateData) lifetimeOptions {
+	var btokenv2 acl.BearerToken
+	gateData.BearerToken.WriteToV2(&btokenv2)
+
+	return lifetimeOptions{
+		Iat: btokenv2.GetBody().GetLifetime().GetIat(),
+		Exp: btokenv2.GetBody().GetLifetime().GetExp(),
+	}
+}
+
 // ObtainSecret receives an existing secret access key from FrostFS and
 // writes to io.Writer the secret access key.
 func (a *Agent) ObtainSecret(ctx context.Context, w io.Writer, options *ObtainSecretOptions) error {
@@ -404,7 +473,9 @@ func buildBearerTokens(key *keys.PrivateKey, impersonate bool, table *eacl.Table
 func buildSessionToken(key *keys.PrivateKey, lifetime lifetimeOptions, ctx sessionTokenContext, gateKey *keys.PublicKey) (*session.Container, error) {
 	tok := new(session.Container)
 	tok.ForVerb(ctx.verb)
-	tok.AppliedTo(ctx.containerID)
+	if !ctx.containerID.Equals(cid.ID{}) {
+		tok.ApplyOnlyTo(ctx.containerID)
+	}
 
 	tok.SetID(uuid.New())
 	tok.SetAuthKey((*frostfsecdsa.PublicKey)(gateKey))
@@ -465,3 +536,55 @@ func createTokens(options *IssueSecretOptions, lifetime lifetimeOptions) ([]*acc
 
 	return gates, nil
 }
+
+func formTokensToUpdate(options tokenUpdateOptions) ([]*accessbox.GateData, error) {
+	btoken := options.box.Gate.BearerToken
+	table := btoken.EACLTable()
+
+	bearerTokens, err := buildBearerTokens(options.frostFSKey, btoken.Impersonate(), &table, options.lifetime, options.gatesPublicKeys)
+	if err != nil {
+		return nil, fmt.Errorf("failed to build bearer tokens: %w", err)
+	}
+
+	gates := make([]*accessbox.GateData, len(options.gatesPublicKeys))
+	for i, gateKey := range options.gatesPublicKeys {
+		gates[i] = accessbox.NewGateData(gateKey, bearerTokens[i])
+	}
+
+	sessionRules := make([]sessionTokenContext, len(options.box.Gate.SessionTokens))
+	for i, token := range options.box.Gate.SessionTokens {
+		var stoken sessionv2.Token
+		token.WriteToV2(&stoken)
+
+		sessionCtx, ok := stoken.GetBody().GetContext().(*sessionv2.ContainerSessionContext)
+		if !ok {
+			return nil, fmt.Errorf("get context from session token: %w", err)
+		}
+
+		var cnrID cid.ID
+		if cnrIDv2 := sessionCtx.ContainerID(); cnrIDv2 != nil {
+			if err = cnrID.ReadFromV2(*cnrIDv2); err != nil {
+				return nil, fmt.Errorf("read from v2 container id: %w", err)
+			}
+		}
+
+		sessionRules[i] = sessionTokenContext{
+			verb:        session.ContainerVerb(sessionCtx.Verb()),
+			containerID: cnrID,
+		}
+	}
+
+	sessionTokens, err := buildSessionTokens(options.frostFSKey, options.lifetime, sessionRules, options.gatesPublicKeys)
+	if err != nil {
+		return nil, fmt.Errorf("failed to biuild session token: %w", err)
+	}
+	for i, sessionTkns := range sessionTokens {
+		gates[i].SessionTokens = sessionTkns
+	}
+
+	return gates, nil
+}
+
+func accessKeyIDFromAddr(addr oid.Address) string {
+	return addr.Container().EncodeToString() + "0" + addr.Object().EncodeToString()
+}

cmd/s3-authmate/main.go

@@ -2,758 +2,19 @@ package main
 
 import (
 	"context"
-	"crypto/ecdsa"
-	"encoding/hex"
-	"encoding/json"
-	"fmt"
 	"os"
 	"os/signal"
-	"runtime"
-	"strings"
 	"syscall"
-	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/wallet"
-	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
-	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
-	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
-	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/credentials"
-	"github.com/aws/aws-sdk-go/aws/session"
-	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
-	"github.com/spf13/viper"
-	"github.com/urfave/cli/v2"
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/cmd/s3-authmate/modules"
 )
 
-const (
-	poolDialTimeout        = 5 * time.Second
-	poolHealthcheckTimeout = 5 * time.Second
-	poolRebalanceInterval  = 30 * time.Second
-	poolStreamTimeout      = 10 * time.Second
-
-	// a month.
-	defaultLifetime          = 30 * 24 * time.Hour
-	defaultPresignedLifetime = 12 * time.Hour
-)
-
-type PoolConfig struct {
-	Key                *ecdsa.PrivateKey
-	Address            string
-	DialTimeout        time.Duration
-	HealthcheckTimeout time.Duration
-	StreamTimeout      time.Duration
-	RebalanceInterval  time.Duration
-}
-
-var (
-	walletPathFlag           string
-	accountAddressFlag       string
-	peerAddressFlag          string
-	eaclRulesFlag            string
-	disableImpersonateFlag   bool
-	gateWalletPathFlag       string
-	gateAccountAddressFlag   string
-	accessKeyIDFlag          string
-	containerIDFlag          string
-	containerFriendlyName    string
-	containerPlacementPolicy string
-	gatesPublicKeysFlag      cli.StringSlice
-	logEnabledFlag           bool
-	logDebugEnabledFlag      bool
-	sessionTokenFlag         string
-	lifetimeFlag             time.Duration
-	endpointFlag             string
-	bucketFlag               string
-	objectFlag               string
-	methodFlag               string
-	profileFlag              string
-	regionFlag               string
-	secretAccessKeyFlag      string
-	containerPolicies        string
-	awcCliCredFile           string
-	timeoutFlag              time.Duration
-
-	// pool timeouts flag.
-	poolDialTimeoutFlag        time.Duration
-	poolHealthcheckTimeoutFlag time.Duration
-	poolRebalanceIntervalFlag  time.Duration
-	poolStreamTimeoutFlag      time.Duration
-)
-
-const (
-	envWalletPassphrase     = "wallet.passphrase"
-	envWalletGatePassphrase = "wallet.gate.passphrase"
-	envSecretAccessKey      = "secret.access.key"
-)
-
-var zapConfig = zap.Config{
-	Development: true,
-	Encoding:    "console",
-	Level:       zap.NewAtomicLevelAt(zapcore.FatalLevel),
-	OutputPaths: []string{"stdout"},
-	EncoderConfig: zapcore.EncoderConfig{
-		MessageKey:   "message",
-		LevelKey:     "level",
-		EncodeLevel:  zapcore.CapitalLevelEncoder,
-		TimeKey:      "time",
-		EncodeTime:   zapcore.ISO8601TimeEncoder,
-		CallerKey:    "caller",
-		EncodeCaller: zapcore.ShortCallerEncoder,
-	},
-}
-
-func prepare() (context.Context, *zap.Logger) {
-	var (
-		err    error
-		log    = zap.NewNop()
-		ctx, _ = signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
-	)
-
-	if !logEnabledFlag {
-		return ctx, log
-	} else if logDebugEnabledFlag {
-		zapConfig.Level = zap.NewAtomicLevelAt(zapcore.DebugLevel)
-	}
-
-	if log, err = zapConfig.Build(); err != nil {
-		panic(fmt.Errorf("create logger: %w", err))
-	}
-
-	return ctx, log
-}
-
 func main() {
-	app := &cli.App{
-		Name:     "FrostFS S3 Authmate",
-		Usage:    "Helps manage delegated access via gates to data stored in FrostFS network",
-		Version:  version.Version,
-		Flags:    appFlags(),
-		Commands: appCommands(),
-	}
-	cli.VersionPrinter = func(c *cli.Context) {
-		fmt.Printf("%s\nVersion: %s\nGoVersion: %s\n", c.App.Name, c.App.Version, runtime.Version())
-	}
+	ctx, _ := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
 
-	viper.AutomaticEnv()
-	viper.SetEnvPrefix("AUTHMATE")
-	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
-	viper.AllowEmptyEnv(true)
-
-	if err := app.Run(os.Args); err != nil {
-		_, _ = fmt.Fprintf(os.Stderr, "error: %s\n", err)
-		os.Exit(100)
+	if cmd, err := modules.Execute(ctx); err != nil {
+		cmd.PrintErrln("Error:", err.Error())
+		cmd.PrintErrf("Run '%v --help' for usage.\n", cmd.CommandPath())
+		os.Exit(1)
 	}
 }
-
-func appFlags() []cli.Flag {
-	return []cli.Flag{
-		&cli.BoolFlag{
-			Name:        "with-log",
-			Usage:       "Enable logger",
-			Destination: &logEnabledFlag,
-		},
-		&cli.BoolFlag{
-			Name:        "debug",
-			Usage:       "Enable debug logger level",
-			Destination: &logDebugEnabledFlag,
-		},
-		&cli.DurationFlag{
-			Name: "timeout",
-			Usage: "timeout of processing of the command, for example 2m " +
-				"(note: max time unit is an hour so to set a day you should use 24h)",
-			Destination: &timeoutFlag,
-			Value:       1 * time.Minute,
-		},
-	}
-}
-
-func appCommands() []*cli.Command {
-	return []*cli.Command{
-		issueSecret(),
-		obtainSecret(),
-		generatePresignedURL(),
-	}
-}
-
-func issueSecret() *cli.Command {
-	return &cli.Command{
-		Name:  "issue-secret",
-		Usage: "Issue a secret in FrostFS network",
-		Flags: []cli.Flag{
-			&cli.StringFlag{
-				Name:        "wallet",
-				Value:       "",
-				Usage:       "path to the wallet",
-				Required:    true,
-				Destination: &walletPathFlag,
-			},
-			&cli.StringFlag{
-				Name:        "address",
-				Value:       "",
-				Usage:       "address of wallet account",
-				Required:    false,
-				Destination: &accountAddressFlag,
-			},
-			&cli.StringFlag{
-				Name:        "peer",
-				Value:       "",
-				Usage:       "address of a frostfs peer to connect to",
-				Required:    true,
-				Destination: &peerAddressFlag,
-			},
-			&cli.StringFlag{
-				Name:        "bearer-rules",
-				Usage:       "rules for bearer token (filepath or a plain json string are allowed, can be used only with --disable-impersonate)",
-				Required:    false,
-				Destination: &eaclRulesFlag,
-			},
-			&cli.BoolFlag{
-				Name:        "disable-impersonate",
-				Usage:       "mark token as not impersonate to don't consider token signer as request owner (must be provided to use --bearer-rules flag)",
-				Required:    false,
-				Destination: &disableImpersonateFlag,
-			},
-			&cli.StringSliceFlag{
-				Name:        "gate-public-key",
-				Usage:       "public 256r1 key of a gate (use flags repeatedly for multiple gates)",
-				Required:    true,
-				Destination: &gatesPublicKeysFlag,
-			},
-			&cli.StringFlag{
-				Name:        "container-id",
-				Usage:       "auth container id to put the secret into",
-				Required:    false,
-				Destination: &containerIDFlag,
-			},
-			&cli.StringFlag{
-				Name:        "access-key-id",
-				Usage:       "access key id for s3 (use this flag to update existing creds, if this flag is provided '--container-id', '--container-friendly-name' and '--container-placement-policy' are ineffective)",
-				Required:    false,
-				Destination: &accessKeyIDFlag,
-			},
-			&cli.StringFlag{
-				Name:        "container-friendly-name",
-				Usage:       "friendly name of auth container to put the secret into",
-				Required:    false,
-				Destination: &containerFriendlyName,
-			},
-			&cli.StringFlag{
-				Name:        "container-placement-policy",
-				Usage:       "placement policy of auth container to put the secret into",
-				Required:    false,
-				Destination: &containerPlacementPolicy,
-				Value:       "REP 2 IN X CBF 3 SELECT 2 FROM * AS X",
-			},
-			&cli.StringFlag{
-				Name:        "session-tokens",
-				Usage:       "create session tokens with rules, if the rules are set as 'none', no session tokens will be created",
-				Required:    false,
-				Destination: &sessionTokenFlag,
-				Value:       "",
-			},
-			&cli.DurationFlag{
-				Name: "lifetime",
-				Usage: `Lifetime of tokens. For example 50h30m (note: max time unit is an hour so to set a day you should use 24h).
-It will be ceil rounded to the nearest amount of epoch.`,
-				Required:    false,
-				Destination: &lifetimeFlag,
-				Value:       defaultLifetime,
-			},
-			&cli.StringFlag{
-				Name:        "container-policy",
-				Usage:       "mapping AWS storage class to FrostFS storage policy as plain json string or path to json file",
-				Required:    false,
-				Destination: &containerPolicies,
-			},
-			&cli.StringFlag{
-				Name:        "aws-cli-credentials",
-				Usage:       "path to the aws cli credential file",
-				Required:    false,
-				Destination: &awcCliCredFile,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-dial-timeout",
-				Usage:       `Timeout for connection to the node in pool to be established`,
-				Required:    false,
-				Destination: &poolDialTimeoutFlag,
-				Value:       poolDialTimeout,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-healthcheck-timeout",
-				Usage:       `Timeout for request to node to decide if it is alive`,
-				Required:    false,
-				Destination: &poolHealthcheckTimeoutFlag,
-				Value:       poolHealthcheckTimeout,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-rebalance-interval",
-				Usage:       `Interval for updating nodes health status`,
-				Required:    false,
-				Destination: &poolRebalanceIntervalFlag,
-				Value:       poolRebalanceInterval,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-stream-timeout",
-				Usage:       `Timeout for individual operation in streaming RPC`,
-				Required:    false,
-				Destination: &poolStreamTimeoutFlag,
-				Value:       poolStreamTimeout,
-			},
-		},
-		Action: func(c *cli.Context) error {
-			ctx, log := prepare()
-
-			password := wallet.GetPassword(viper.GetViper(), envWalletPassphrase)
-			key, err := wallet.GetKeyFromPath(walletPathFlag, accountAddressFlag, password)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("failed to load frostfs private key: %s", err), 1)
-			}
-
-			ctx, cancel := context.WithCancel(ctx)
-			defer cancel()
-
-			poolCfg := PoolConfig{
-				Key:                &key.PrivateKey,
-				Address:            peerAddressFlag,
-				DialTimeout:        poolDialTimeoutFlag,
-				HealthcheckTimeout: poolHealthcheckTimeoutFlag,
-				StreamTimeout:      poolStreamTimeoutFlag,
-				RebalanceInterval:  poolRebalanceIntervalFlag,
-			}
-
-			frostFS, err := createFrostFS(ctx, log, poolCfg)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("failed to create FrostFS component: %s", err), 2)
-			}
-
-			agent := authmate.New(log, frostFS)
-
-			var containerID cid.ID
-			if len(containerIDFlag) > 0 {
-				if err = containerID.DecodeString(containerIDFlag); err != nil {
-					return cli.Exit(fmt.Sprintf("failed to parse auth container id: %s", err), 3)
-				}
-			}
-
-			var credsToUpdate *authmate.UpdateOptions
-			if len(accessKeyIDFlag) > 0 {
-				secretAccessKeyStr := wallet.GetPassword(viper.GetViper(), envSecretAccessKey)
-				if secretAccessKeyStr == nil {
-					return fmt.Errorf("you must provide AUTHMATE_SECRET_ACCESS_KEY env to update existing creds")
-				}
-
-				secretAccessKey, err := hex.DecodeString(*secretAccessKeyStr)
-				if err != nil {
-					return fmt.Errorf("access key must be hex encoded")
-				}
-
-				var addr oid.Address
-				credAddr := strings.Replace(accessKeyIDFlag, "0", "/", 1)
-				if err = addr.DecodeString(credAddr); err != nil {
-					return fmt.Errorf("failed to parse creds address: %w", err)
-				}
-				// we can create new creds version only in the same container
-				containerID = addr.Container()
-
-				credsToUpdate = &authmate.UpdateOptions{
-					Address:         addr,
-					SecretAccessKey: secretAccessKey,
-				}
-			}
-
-			var gatesPublicKeys []*keys.PublicKey
-			for _, key := range gatesPublicKeysFlag.Value() {
-				gpk, err := keys.NewPublicKeyFromString(key)
-				if err != nil {
-					return cli.Exit(fmt.Sprintf("failed to load gate's public key: %s", err), 4)
-				}
-				gatesPublicKeys = append(gatesPublicKeys, gpk)
-			}
-
-			if lifetimeFlag <= 0 {
-				return cli.Exit(fmt.Sprintf("lifetime must be greater 0, current value: %d", lifetimeFlag), 5)
-			}
-
-			policies, err := parsePolicies(containerPolicies)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("couldn't parse container policy: %s", err.Error()), 6)
-			}
-
-			if !disableImpersonateFlag && eaclRulesFlag != "" {
-				return cli.Exit("--bearer-rules flag can be used only with --disable-impersonate", 6)
-			}
-
-			bearerRules, err := getJSONRules(eaclRulesFlag)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("couldn't parse 'bearer-rules' flag: %s", err.Error()), 7)
-			}
-
-			sessionRules, skipSessionRules, err := getSessionRules(sessionTokenFlag)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("couldn't parse 'session-tokens' flag: %s", err.Error()), 8)
-			}
-
-			issueSecretOptions := &authmate.IssueSecretOptions{
-				Container: authmate.ContainerOptions{
-					ID:              containerID,
-					FriendlyName:    containerFriendlyName,
-					PlacementPolicy: containerPlacementPolicy,
-				},
-				FrostFSKey:            key,
-				GatesPublicKeys:       gatesPublicKeys,
-				EACLRules:             bearerRules,
-				Impersonate:           !disableImpersonateFlag,
-				SessionTokenRules:     sessionRules,
-				SkipSessionRules:      skipSessionRules,
-				ContainerPolicies:     policies,
-				Lifetime:              lifetimeFlag,
-				AwsCliCredentialsFile: awcCliCredFile,
-				UpdateCreds:           credsToUpdate,
-			}
-
-			var tcancel context.CancelFunc
-			ctx, tcancel = context.WithTimeout(ctx, timeoutFlag)
-			defer tcancel()
-
-			if err = agent.IssueSecret(ctx, os.Stdout, issueSecretOptions); err != nil {
-				return cli.Exit(fmt.Sprintf("failed to issue secret: %s", err), 7)
-			}
-			return nil
-		},
-	}
-}
-
-func generatePresignedURL() *cli.Command {
-	return &cli.Command{
-		Name: "generate-presigned-url",
-		Description: `Generate presigned url using AWS credentials. Credentials must be placed in ~/.aws/credentials.
-You provide profile to load using --profile flag or explicitly provide credentials and region using
---aws-access-key-id, --aws-secret-access-key, --region.
-Note to override credentials you must provide both access key and secret key.`,
-		Usage: "generate-presigned-url --endpoint http://s3.frostfs.devenv:8080 --bucket bucket-name --object object-name --method get --profile aws-profile",
-		Flags: []cli.Flag{
-			&cli.DurationFlag{
-				Name: "lifetime",
-				Usage: `Lifetime of presigned URL. For example 50h30m (note: max time unit is an hour so to set a day you should use 24h).
-It will be ceil rounded to the nearest amount of epoch.`,
-				Required:    false,
-				Destination: &lifetimeFlag,
-				Value:       defaultPresignedLifetime,
-			},
-			&cli.StringFlag{
-				Name:        "endpoint",
-				Usage:       `Endpoint of s3-gw`,
-				Required:    true,
-				Destination: &endpointFlag,
-			},
-			&cli.StringFlag{
-				Name:        "bucket",
-				Usage:       `Bucket name to perform action`,
-				Required:    true,
-				Destination: &bucketFlag,
-			},
-			&cli.StringFlag{
-				Name:        "object",
-				Usage:       `Object name to perform action`,
-				Required:    true,
-				Destination: &objectFlag,
-			},
-			&cli.StringFlag{
-				Name:        "method",
-				Usage:       `HTTP method to perform action`,
-				Required:    true,
-				Destination: &methodFlag,
-			},
-			&cli.StringFlag{
-				Name:        "profile",
-				Usage:       `AWS profile to load`,
-				Required:    false,
-				Destination: &profileFlag,
-			},
-			&cli.StringFlag{
-				Name:        "region",
-				Usage:       `AWS region to use in signature (default is taken from ~/.aws/config)`,
-				Required:    false,
-				Destination: &regionFlag,
-			},
-			&cli.StringFlag{
-				Name:        "aws-access-key-id",
-				Usage:       `AWS access key id to sign the URL (default is taken from ~/.aws/credentials)`,
-				Required:    false,
-				Destination: &accessKeyIDFlag,
-			},
-			&cli.StringFlag{
-				Name:        "aws-secret-access-key",
-				Usage:       `AWS access secret access key to sign the URL (default is taken from ~/.aws/credentials)`,
-				Required:    false,
-				Destination: &secretAccessKeyFlag,
-			},
-		},
-		Action: func(c *cli.Context) error {
-			var cfg aws.Config
-			if regionFlag != "" {
-				cfg.Region = &regionFlag
-			}
-			if accessKeyIDFlag != "" && secretAccessKeyFlag != "" {
-				cfg.Credentials = credentials.NewStaticCredentialsFromCreds(credentials.Value{
-					AccessKeyID:     accessKeyIDFlag,
-					SecretAccessKey: secretAccessKeyFlag,
-				})
-			}
-
-			sess, err := session.NewSessionWithOptions(session.Options{
-				Config:            cfg,
-				Profile:           profileFlag,
-				SharedConfigState: session.SharedConfigEnable,
-			})
-			if err != nil {
-				return fmt.Errorf("couldn't get credentials: %w", err)
-			}
-
-			reqData := auth.RequestData{
-				Method:   methodFlag,
-				Endpoint: endpointFlag,
-				Bucket:   bucketFlag,
-				Object:   objectFlag,
-			}
-			presignData := auth.PresignData{
-				Service:  "s3",
-				Region:   *sess.Config.Region,
-				Lifetime: lifetimeFlag,
-				SignTime: time.Now().UTC(),
-			}
-
-			req, err := auth.PresignRequest(sess.Config.Credentials, reqData, presignData)
-			if err != nil {
-				return err
-			}
-
-			res := &struct{ URL string }{
-				URL: req.URL.String(),
-			}
-
-			enc := json.NewEncoder(os.Stdout)
-			enc.SetIndent("", "  ")
-			enc.SetEscapeHTML(false)
-			return enc.Encode(res)
-		},
-	}
-}
-
-func parsePolicies(val string) (authmate.ContainerPolicies, error) {
-	if val == "" {
-		return nil, nil
-	}
-
-	var (
-		data = []byte(val)
-		err  error
-	)
-
-	if !json.Valid(data) {
-		if data, err = os.ReadFile(val); err != nil {
-			return nil, fmt.Errorf("coudln't read json file or provided json is invalid")
-		}
-	}
-
-	var policies authmate.ContainerPolicies
-	if err = json.Unmarshal(data, &policies); err != nil {
-		return nil, fmt.Errorf("unmarshal policies: %w", err)
-	}
-	if _, ok := policies[api.DefaultLocationConstraint]; ok {
-		return nil, fmt.Errorf("config overrides %s location constraint", api.DefaultLocationConstraint)
-	}
-
-	return policies, nil
-}
-
-func getJSONRules(val string) ([]byte, error) {
-	if val == "" {
-		return nil, nil
-	}
-	data := []byte(val)
-	if json.Valid(data) {
-		return data, nil
-	}
-
-	if data, err := os.ReadFile(val); err == nil {
-		if json.Valid(data) {
-			return data, nil
-		}
-	}
-
-	return nil, fmt.Errorf("coudln't read json file or provided json is invalid")
-}
-
-// getSessionRules reads json session rules.
-// It returns true if rules must be skipped.
-func getSessionRules(r string) ([]byte, bool, error) {
-	if r == "none" {
-		return nil, true, nil
-	}
-
-	data, err := getJSONRules(r)
-	return data, false, err
-}
-
-func obtainSecret() *cli.Command {
-	command := &cli.Command{
-		Name:  "obtain-secret",
-		Usage: "Obtain a secret from FrostFS network",
-		Flags: []cli.Flag{
-			&cli.StringFlag{
-				Name:        "wallet",
-				Value:       "",
-				Usage:       "path to the wallet",
-				Required:    true,
-				Destination: &walletPathFlag,
-			},
-			&cli.StringFlag{
-				Name:        "address",
-				Value:       "",
-				Usage:       "address of wallet account",
-				Required:    false,
-				Destination: &accountAddressFlag,
-			},
-			&cli.StringFlag{
-				Name:        "peer",
-				Value:       "",
-				Usage:       "address of frostfs peer to connect to",
-				Required:    true,
-				Destination: &peerAddressFlag,
-			},
-			&cli.StringFlag{
-				Name:        "gate-wallet",
-				Value:       "",
-				Usage:       "path to the wallet",
-				Required:    true,
-				Destination: &gateWalletPathFlag,
-			},
-			&cli.StringFlag{
-				Name:        "gate-address",
-				Value:       "",
-				Usage:       "address of wallet account",
-				Required:    false,
-				Destination: &gateAccountAddressFlag,
-			},
-			&cli.StringFlag{
-				Name:        "access-key-id",
-				Usage:       "access key id for s3",
-				Required:    true,
-				Destination: &accessKeyIDFlag,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-dial-timeout",
-				Usage:       `Timeout for connection to the node in pool to be established`,
-				Required:    false,
-				Destination: &poolDialTimeoutFlag,
-				Value:       poolDialTimeout,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-healthcheck-timeout",
-				Usage:       `Timeout for request to node to decide if it is alive`,
-				Required:    false,
-				Destination: &poolHealthcheckTimeoutFlag,
-				Value:       poolHealthcheckTimeout,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-rebalance-interval",
-				Usage:       `Interval for updating nodes health status`,
-				Required:    false,
-				Destination: &poolRebalanceIntervalFlag,
-				Value:       poolRebalanceInterval,
-			},
-			&cli.DurationFlag{
-				Name:        "pool-stream-timeout",
-				Usage:       `Timeout for individual operation in streaming RPC`,
-				Required:    false,
-				Destination: &poolStreamTimeoutFlag,
-				Value:       poolStreamTimeout,
-			},
-		},
-		Action: func(c *cli.Context) error {
-			ctx, log := prepare()
-
-			password := wallet.GetPassword(viper.GetViper(), envWalletPassphrase)
-			key, err := wallet.GetKeyFromPath(walletPathFlag, accountAddressFlag, password)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("failed to load frostfs private key: %s", err), 1)
-			}
-
-			ctx, cancel := context.WithCancel(ctx)
-			defer cancel()
-
-			poolCfg := PoolConfig{
-				Key:                &key.PrivateKey,
-				Address:            peerAddressFlag,
-				DialTimeout:        poolDialTimeoutFlag,
-				HealthcheckTimeout: poolHealthcheckTimeoutFlag,
-				StreamTimeout:      poolStreamTimeoutFlag,
-				RebalanceInterval:  poolRebalanceIntervalFlag,
-			}
-
-			frostFS, err := createFrostFS(ctx, log, poolCfg)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("failed to create FrostFS component: %s", err), 2)
-			}
-
-			agent := authmate.New(log, frostFS)
-
-			var _ = agent
-
-			password = wallet.GetPassword(viper.GetViper(), envWalletGatePassphrase)
-			gateCreds, err := wallet.GetKeyFromPath(gateWalletPathFlag, gateAccountAddressFlag, password)
-			if err != nil {
-				return cli.Exit(fmt.Sprintf("failed to create owner's private key: %s", err), 4)
-			}
-
-			secretAddress := strings.Replace(accessKeyIDFlag, "0", "/", 1)
-
-			obtainSecretOptions := &authmate.ObtainSecretOptions{
-				SecretAddress:  secretAddress,
-				GatePrivateKey: gateCreds,
-			}
-
-			var tcancel context.CancelFunc
-			ctx, tcancel = context.WithTimeout(ctx, timeoutFlag)
-			defer tcancel()
-
-			if err = agent.ObtainSecret(ctx, os.Stdout, obtainSecretOptions); err != nil {
-				return cli.Exit(fmt.Sprintf("failed to obtain secret: %s", err), 5)
-			}
-
-			return nil
-		},
-	}
-	return command
-}
-
-func createFrostFS(ctx context.Context, log *zap.Logger, cfg PoolConfig) (authmate.FrostFS, error) {
-	log.Debug("prepare connection pool")
-
-	var prm pool.InitParameters
-	prm.SetKey(cfg.Key)
-	prm.SetNodeDialTimeout(cfg.DialTimeout)
-	prm.SetHealthcheckTimeout(cfg.HealthcheckTimeout)
-	prm.SetNodeStreamTimeout(cfg.StreamTimeout)
-	prm.SetClientRebalanceInterval(cfg.RebalanceInterval)
-	prm.AddNode(pool.NewNodeParam(1, cfg.Address, 1))
-
-	p, err := pool.NewPool(prm)
-	if err != nil {
-		return nil, fmt.Errorf("create pool: %w", err)
-	}
-
-	if err = p.Dial(ctx); err != nil {
-		return nil, fmt.Errorf("dial pool: %w", err)
-	}
-
-	return frostfs.NewAuthmateFrostFS(p), nil
-}

cmd/s3-authmate/modules/generate-presigned-url.go

@@ -0,0 +1,108 @@
+package modules
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var generatePresignedURLCmd = &cobra.Command{
+	Use:   "generate-presigned-url",
+	Short: "Generate presigned url using AWS credentials",
+	Long: `Generate presigned url using AWS credentials.Credentials must be placed in ~/.aws/credentials.
+You provide profile to load using --profile flag or explicitly provide credentials and region using
+--aws-access-key-id, --aws-secret-access-key, --region.
+Note to override credentials you must provide both access key and secret key.`,
+	Example: `frostfs-s3-authmate generate-presigned-url --method put --bucket my-bucket --object my-object --endpoint http://localhost:8084 --lifetime 12h --region ru --aws-access-key-id ETaA2CadPcA7bAkLsML2PbTudXY8uRt2PDjCCwkvRv9s0FDCxWDXYc1SA1vKv8KbyCNsLY2AmAjJ92Vz5rgvsFCy --aws-secret-access-key c2d65ef2980f03f4f495bdebedeeae760496697880d61d106bb9a4e5cd2e0607`,
+	RunE:    runGeneratePresignedURLCmd,
+}
+
+const defaultPresignedLifetime = 12 * time.Hour
+
+const (
+	endpointFlag           = "endpoint"
+	bucketFlag             = "bucket"
+	objectFlag             = "object"
+	methodFlag             = "method"
+	profileFlag            = "profile"
+	regionFlag             = "region"
+	awsAccessKeyIDFlag     = "aws-access-key-id"
+	awsSecretAccessKeyFlag = "aws-secret-access-key"
+)
+
+func initGeneratePresignedURLCmd() {
+	generatePresignedURLCmd.Flags().Duration(lifetimeFlag, defaultPresignedLifetime, "Lifetime of presigned URL. For example 50h30m (note: max time unit is an hour so to set a day you should use 24h).\nIt will be ceil rounded to the nearest amount of epoch.")
+	generatePresignedURLCmd.Flags().String(endpointFlag, "", "S3 gateway endpoint")
+	generatePresignedURLCmd.Flags().String(bucketFlag, "", "Bucket name to perform action")
+	generatePresignedURLCmd.Flags().String(objectFlag, "", "Object name to perform action")
+	generatePresignedURLCmd.Flags().String(methodFlag, "", "HTTP method to perform action")
+	generatePresignedURLCmd.Flags().String(profileFlag, "", "AWS profile to load")
+	generatePresignedURLCmd.Flags().String(regionFlag, "", "AWS region to use in signature (default is taken from ~/.aws/config)")
+	generatePresignedURLCmd.Flags().String(awsAccessKeyIDFlag, "", "AWS access key id to sign the URL (default is taken from ~/.aws/credentials)")
+	generatePresignedURLCmd.Flags().String(awsSecretAccessKeyFlag, "", "AWS secret access key to sign the URL (default is taken from ~/.aws/credentials)")
+
+	_ = generatePresignedURLCmd.MarkFlagRequired(endpointFlag)
+	_ = generatePresignedURLCmd.MarkFlagRequired(bucketFlag)
+	_ = generatePresignedURLCmd.MarkFlagRequired(objectFlag)
+}
+
+func runGeneratePresignedURLCmd(*cobra.Command, []string) error {
+	var cfg aws.Config
+
+	if region := viper.GetString(regionFlag); region != "" {
+		cfg.Region = &region
+	}
+	accessKeyID := viper.GetString(awsAccessKeyIDFlag)
+	secretAccessKey := viper.GetString(awsSecretAccessKeyFlag)
+
+	if accessKeyID != "" && secretAccessKey != "" {
+		cfg.Credentials = credentials.NewStaticCredentialsFromCreds(credentials.Value{
+			AccessKeyID:     accessKeyID,
+			SecretAccessKey: secretAccessKey,
+		})
+	}
+
+	sess, err := session.NewSessionWithOptions(session.Options{
+		Config:            cfg,
+		Profile:           viper.GetString(profileFlag),
+		SharedConfigState: session.SharedConfigEnable,
+	})
+	if err != nil {
+		return fmt.Errorf("couldn't get aws credentials: %w", err)
+	}
+
+	reqData := auth.RequestData{
+		Method:   viper.GetString(methodFlag),
+		Endpoint: viper.GetString(endpointFlag),
+		Bucket:   viper.GetString(bucketFlag),
+		Object:   viper.GetString(objectFlag),
+	}
+	presignData := auth.PresignData{
+		Service:  "s3",
+		Region:   *sess.Config.Region,
+		Lifetime: viper.GetDuration(lifetimeFlag),
+		SignTime: time.Now().UTC(),
+	}
+
+	req, err := auth.PresignRequest(sess.Config.Credentials, reqData, presignData)
+	if err != nil {
+		return err
+	}
+
+	res := &struct{ URL string }{
+		URL: req.URL.String(),
+	}
+
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+	enc.SetEscapeHTML(false)
+	return enc.Encode(res)
+}

cmd/s3-authmate/modules/issue-secret.go

@@ -0,0 +1,176 @@
+package modules
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/wallet"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var issueSecretCmd = &cobra.Command{
+	Use:     "issue-secret",
+	Short:   "Issue a secret in FrostFS network",
+	Long:    "Creates new s3 credentials to use with frostfs-s3-gw",
+	Example: `frostfs-s3-authmate issue-secret --wallet wallet.json --peer s01.frostfs.devenv:8080 --gate-public-key 031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a`,
+	RunE:    runIssueSecretCmd,
+}
+
+const (
+	walletFlag                   = "wallet"
+	addressFlag                  = "address"
+	peerFlag                     = "peer"
+	bearerRulesFlag              = "bearer-rules"
+	disableImpersonateFlag       = "disable-impersonate"
+	gatePublicKeyFlag            = "gate-public-key"
+	containerIDFlag              = "container-id"
+	containerFriendlyNameFlag    = "container-friendly-name"
+	containerPlacementPolicyFlag = "container-placement-policy"
+	sessionTokensFlag            = "session-tokens"
+	lifetimeFlag                 = "lifetime"
+	containerPolicyFlag          = "container-policy"
+	awsCLICredentialFlag         = "aws-cli-credentials"
+)
+
+const (
+	walletPassphraseCfg = "wallet.passphrase"
+)
+
+const (
+	defaultAccessBoxLifetime = 30 * 24 * time.Hour
+
+	defaultPoolDialTimeout        = 5 * time.Second
+	defaultPoolHealthcheckTimeout = 5 * time.Second
+	defaultPoolRebalanceInterval  = 30 * time.Second
+	defaultPoolStreamTimeout      = 10 * time.Second
+)
+
+const (
+	poolDialTimeoutFlag        = "pool-dial-timeout"
+	poolHealthcheckTimeoutFlag = "pool-healthcheck-timeout"
+	poolRebalanceIntervalFlag  = "pool-rebalance-interval"
+	poolStreamTimeoutFlag      = "pool-stream-timeout"
+)
+
+func initIssueSecretCmd() {
+	issueSecretCmd.Flags().String(walletFlag, "", "Path to the wallet that will be owner of the credentials")
+	issueSecretCmd.Flags().String(addressFlag, "", "Address of the wallet account")
+	issueSecretCmd.Flags().String(peerFlag, "", "Address of a frostfs peer to connect to")
+	issueSecretCmd.Flags().String(bearerRulesFlag, "", "Rules for bearer token (filepath or a plain json string are allowed, can be used only with --disable-impersonate)")
+	issueSecretCmd.Flags().Bool(disableImpersonateFlag, false, "Mark token as not impersonate to don't consider token signer as request owner (must be provided to use --bearer-rules flag)")
+	issueSecretCmd.Flags().StringSlice(gatePublicKeyFlag, nil, "Public 256r1 key of a gate (use flags repeatedly for multiple gates or separate them by comma)")
+	issueSecretCmd.Flags().String(containerIDFlag, "", "Auth container id to put the secret into (if not provided new container will be created)")
+	issueSecretCmd.Flags().String(containerFriendlyNameFlag, "", "Friendly name of auth container to put the secret into (flag value will be used only if --container-id is missed)")
+	issueSecretCmd.Flags().String(containerPlacementPolicyFlag, "REP 2 IN X CBF 3 SELECT 2 FROM * AS X", "Placement policy of auth container to put the secret into (flag value will be used only if --container-id is missed)")
+	issueSecretCmd.Flags().String(sessionTokensFlag, "", "create session tokens with rules, if the rules are set as 'none', no session tokens will be created")
+	issueSecretCmd.Flags().Duration(lifetimeFlag, defaultAccessBoxLifetime, "Lifetime of tokens. For example 50h30m (note: max time unit is an hour so to set a day you should use 24h).\nIt will be ceil rounded to the nearest amount of epoch.")
+	issueSecretCmd.Flags().String(containerPolicyFlag, "", "Mapping AWS storage class to FrostFS storage policy as plain json string or path to json file")
+	issueSecretCmd.Flags().String(awsCLICredentialFlag, "", "Path to the aws cli credential file")
+	issueSecretCmd.Flags().Duration(poolDialTimeoutFlag, defaultPoolDialTimeout, "Timeout for connection to the node in pool to be established")
+	issueSecretCmd.Flags().Duration(poolHealthcheckTimeoutFlag, defaultPoolHealthcheckTimeout, "Timeout for request to node to decide if it is alive")
+	issueSecretCmd.Flags().Duration(poolRebalanceIntervalFlag, defaultPoolRebalanceInterval, "Interval for updating nodes health status")
+	issueSecretCmd.Flags().Duration(poolStreamTimeoutFlag, defaultPoolStreamTimeout, "Timeout for individual operation in streaming RPC")
+
+	_ = issueSecretCmd.MarkFlagRequired(walletFlag)
+	_ = issueSecretCmd.MarkFlagRequired(peerFlag)
+	_ = issueSecretCmd.MarkFlagRequired(gatePublicKeyFlag)
+}
+
+func runIssueSecretCmd(cmd *cobra.Command, _ []string) error {
+	ctx, cancel := context.WithTimeout(cmd.Context(), viper.GetDuration(timeoutFlag))
+	defer cancel()
+
+	log := getLogger()
+
+	password := wallet.GetPassword(viper.GetViper(), walletPassphraseCfg)
+	key, err := wallet.GetKeyFromPath(viper.GetString(walletFlag), viper.GetString(addressFlag), password)
+	if err != nil {
+		return fmt.Errorf("failed to load frostfs private key: %s", err)
+	}
+
+	var cnrID cid.ID
+	containerID := viper.GetString(containerIDFlag)
+	if len(containerID) > 0 {
+		if err = cnrID.DecodeString(containerID); err != nil {
+			return fmt.Errorf("failed to parse auth container id: %s", err)
+		}
+	}
+
+	var gatesPublicKeys []*keys.PublicKey
+	for _, keyStr := range viper.GetStringSlice(gatePublicKeyFlag) {
+		gpk, err := keys.NewPublicKeyFromString(keyStr)
+		if err != nil {
+			return fmt.Errorf("failed to load gate's public key: %s", err)
+		}
+		gatesPublicKeys = append(gatesPublicKeys, gpk)
+	}
+
+	lifetime := viper.GetDuration(lifetimeFlag)
+	if lifetime <= 0 {
+		return fmt.Errorf("lifetime must be greater 0, current value: %d", lifetime)
+	}
+
+	policies, err := parsePolicies(viper.GetString(containerPolicyFlag))
+	if err != nil {
+		return fmt.Errorf("couldn't parse container policy: %s", err.Error())
+	}
+
+	disableImpersonate := viper.GetBool(disableImpersonateFlag)
+	eaclRules := viper.GetString(bearerRulesFlag)
+	if !disableImpersonate && eaclRules != "" {
+		return errors.New("--bearer-rules flag can be used only with --disable-impersonate")
+	}
+
+	bearerRules, err := getJSONRules(eaclRules)
+	if err != nil {
+		return fmt.Errorf("couldn't parse 'bearer-rules' flag: %s", err.Error())
+	}
+
+	sessionRules, skipSessionRules, err := getSessionRules(viper.GetString(sessionTokensFlag))
+	if err != nil {
+		return fmt.Errorf("couldn't parse 'session-tokens' flag: %s", err.Error())
+	}
+
+	poolCfg := PoolConfig{
+		Key:                key,
+		Address:            viper.GetString(peerFlag),
+		DialTimeout:        viper.GetDuration(poolDialTimeoutFlag),
+		HealthcheckTimeout: viper.GetDuration(poolHealthcheckTimeoutFlag),
+		StreamTimeout:      viper.GetDuration(poolStreamTimeoutFlag),
+		RebalanceInterval:  viper.GetDuration(poolRebalanceIntervalFlag),
+	}
+
+	frostFS, err := createFrostFS(ctx, log, poolCfg)
+	if err != nil {
+		return fmt.Errorf("failed to create FrostFS component: %s", err)
+	}
+
+	issueSecretOptions := &authmate.IssueSecretOptions{
+		Container: authmate.ContainerOptions{
+			ID:              cnrID,
+			FriendlyName:    viper.GetString(containerFriendlyNameFlag),
+			PlacementPolicy: viper.GetString(containerPlacementPolicyFlag),
+		},
+		FrostFSKey:            key,
+		GatesPublicKeys:       gatesPublicKeys,
+		EACLRules:             bearerRules,
+		Impersonate:           !disableImpersonate,
+		SessionTokenRules:     sessionRules,
+		SkipSessionRules:      skipSessionRules,
+		ContainerPolicies:     policies,
+		Lifetime:              lifetime,
+		AwsCliCredentialsFile: viper.GetString(awsCLICredentialFlag),
+	}
+
+	if err = authmate.New(log, frostFS).IssueSecret(ctx, os.Stdout, issueSecretOptions); err != nil {
+		return fmt.Errorf("failed to issue secret: %s", err)
+	}
+	return nil
+}

cmd/s3-authmate/modules/obtain-secret.go

@@ -0,0 +1,94 @@
+package modules
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/wallet"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"github.com/urfave/cli/v2"
+)
+
+var obtainSecretCmd = &cobra.Command{
+	Use:     "obtain-secret",
+	Short:   "Obtain a secret from FrostFS network",
+	Long:    "Gets generated secret from credential object (accessbox)",
+	Example: `frostfs-s3-authmate obtain-secret --wallet wallet.json --peer s01.neofs.devenv:8080 --gate-wallet s3-wallet.json --access-key-id EC3tyWpTEKfGNS888PFBpwQzZTrnwDXReGjgAxa8Em1h037VoWktUZCAk1LVA5SvVbVd2NHHb2NQm9jhcd5WFU5VD`,
+	RunE:    runObtainSecretCmd,
+}
+
+const (
+	gateWalletFlag  = "gate-wallet"
+	gateAddressFlag = "gate-address"
+	accessKeyIDFlag = "access-key-id"
+)
+
+const (
+	walletGatePassphraseCfg = "wallet.gate.passphrase"
+)
+
+func initObtainSecretCmd() {
+	obtainSecretCmd.Flags().String(walletFlag, "", "Path to the wallet that will be owner of the credentials")
+	obtainSecretCmd.Flags().String(addressFlag, "", "Address of the wallet account")
+	obtainSecretCmd.Flags().String(peerFlag, "", "Address of a frostfs peer to connect to")
+	obtainSecretCmd.Flags().String(gateWalletFlag, "", "Path to the s3 gateway wallet to decrypt accessbox")
+	obtainSecretCmd.Flags().String(gateAddressFlag, "", "Address of the s3 gateway wallet account")
+	obtainSecretCmd.Flags().String(accessKeyIDFlag, "", "Access key id of s3 credential for which secret must be obtained")
+	obtainSecretCmd.Flags().Duration(poolDialTimeoutFlag, defaultPoolDialTimeout, "Timeout for connection to the node in pool to be established")
+	obtainSecretCmd.Flags().Duration(poolHealthcheckTimeoutFlag, defaultPoolHealthcheckTimeout, "Timeout for request to node to decide if it is alive")
+	obtainSecretCmd.Flags().Duration(poolRebalanceIntervalFlag, defaultPoolRebalanceInterval, "Interval for updating nodes health status")
+	obtainSecretCmd.Flags().Duration(poolStreamTimeoutFlag, defaultPoolStreamTimeout, "Timeout for individual operation in streaming RPC")
+
+	_ = obtainSecretCmd.MarkFlagRequired(walletFlag)
+	_ = obtainSecretCmd.MarkFlagRequired(peerFlag)
+	_ = obtainSecretCmd.MarkFlagRequired(gateWalletFlag)
+	_ = obtainSecretCmd.MarkFlagRequired(accessKeyIDFlag)
+}
+
+func runObtainSecretCmd(cmd *cobra.Command, _ []string) error {
+	ctx, cancel := context.WithTimeout(cmd.Context(), viper.GetDuration(timeoutFlag))
+	defer cancel()
+
+	log := getLogger()
+
+	password := wallet.GetPassword(viper.GetViper(), walletPassphraseCfg)
+	key, err := wallet.GetKeyFromPath(viper.GetString(walletFlag), viper.GetString(addressFlag), password)
+	if err != nil {
+		return fmt.Errorf("failed to load frostfs private key: %s", err)
+	}
+
+	gatePassword := wallet.GetPassword(viper.GetViper(), walletGatePassphraseCfg)
+	gateKey, err := wallet.GetKeyFromPath(viper.GetString(gateWalletFlag), viper.GetString(gateAddressFlag), gatePassword)
+	if err != nil {
+		return fmt.Errorf("failed to load s3 gate private key: %s", err)
+	}
+
+	poolCfg := PoolConfig{
+		Key:                key,
+		Address:            viper.GetString(peerFlag),
+		DialTimeout:        viper.GetDuration(poolDialTimeoutFlag),
+		HealthcheckTimeout: viper.GetDuration(poolHealthcheckTimeoutFlag),
+		StreamTimeout:      viper.GetDuration(poolStreamTimeoutFlag),
+		RebalanceInterval:  viper.GetDuration(poolRebalanceIntervalFlag),
+	}
+
+	frostFS, err := createFrostFS(ctx, log, poolCfg)
+	if err != nil {
+		return cli.Exit(fmt.Sprintf("failed to create FrostFS component: %s", err), 2)
+	}
+
+	obtainSecretOptions := &authmate.ObtainSecretOptions{
+		SecretAddress:  strings.Replace(viper.GetString(accessKeyIDFlag), "0", "/", 1),
+		GatePrivateKey: gateKey,
+	}
+
+	if err = authmate.New(log, frostFS).ObtainSecret(ctx, os.Stdout, obtainSecretOptions); err != nil {
+		return fmt.Errorf("failed to obtain secret: %s", err)
+	}
+
+	return nil
+}

cmd/s3-authmate/modules/root.go

@@ -0,0 +1,68 @@
+package modules
+
+import (
+	"context"
+	"runtime"
+	"strings"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+// rootCmd represents the base command when called without any subcommands.
+var rootCmd = &cobra.Command{
+	Use:           "frostfs-s3-authmate",
+	Version:       version.Version,
+	Short:         "FrostFS S3 Authmate",
+	Long:          "Helps manage delegated access via gates to data stored in FrostFS network",
+	Example:       "frostfs-s3-authmate --version",
+	SilenceErrors: true,
+	SilenceUsage:  true,
+	PersistentPreRunE: func(cmd *cobra.Command, _ []string) error {
+		viper.AutomaticEnv()
+		viper.SetEnvPrefix("AUTHMATE")
+		viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+		viper.AllowEmptyEnv(true)
+
+		return viper.BindPFlags(cmd.Flags())
+	},
+	RunE: func(cmd *cobra.Command, _ []string) error {
+		return cmd.Help()
+	},
+}
+
+const (
+	withLogFlag = "with-log"
+	debugFlag   = "debug"
+	timeoutFlag = "timeout"
+)
+
+func Execute(ctx context.Context) (*cobra.Command, error) {
+	return rootCmd.ExecuteContextC(ctx)
+}
+
+func init() {
+	rootCmd.PersistentFlags().Bool(withLogFlag, false, "Enable logger")
+	rootCmd.PersistentFlags().Bool(debugFlag, false, "Enable debug logger level")
+	rootCmd.PersistentFlags().Duration(timeoutFlag, time.Minute, "Timeout of processing of the command, for example 2m (note: max time unit is an hour so to set a day you should use 24h)")
+
+	cobra.AddTemplateFunc("runtimeVersion", runtime.Version)
+	rootCmd.SetVersionTemplate(`Frostfs S3 Authmate
+{{printf "Version: %s" .Version }}
+GoVersion: {{ runtimeVersion }}
+`)
+
+	rootCmd.AddCommand(issueSecretCmd)
+	initIssueSecretCmd()
+
+	rootCmd.AddCommand(obtainSecretCmd)
+	initObtainSecretCmd()
+
+	rootCmd.AddCommand(generatePresignedURLCmd)
+	initGeneratePresignedURLCmd()
+
+	rootCmd.AddCommand(updateSecretCmd)
+	initUpdateSecretCmd()
+}

cmd/s3-authmate/modules/update-secret.go

@@ -0,0 +1,108 @@
+package modules
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/wallet"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var updateSecretCmd = &cobra.Command{
+	Use:   "update-secret",
+	Short: "Update a secret in FrostFS network",
+	Long: `Creates new access box that will be available for extend list of s3 gates, preserve all timeout from initial credentials.
+After using this command you can use initial access-key-id to interact with newly added gates`,
+	Example: `To extend list of s3 gates that can use existing credentials run:
+frostfs-s3-authmate update-secret --wallet wallet.json --peer s01.neofs.devenv:8080 --gate-wallet s3-wallet.json \
+	--gate-public-key 031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a \
+	--gate-public-key 021dc56fc6d81d581ae7605a8e00e0e0bab6cbad566a924a527339475a97a8e38e \
+	--acces-key-id EC3tyWpTEKfGNS888PFBpwQzZTrnwDXReGjgAxa8Em1h037VoWktUZCAk1LVA5SvVbVd2NHHb2NQm9jhcd5WFU5VD`,
+	RunE: runUpdateSecretCmd,
+}
+
+func initUpdateSecretCmd() {
+	updateSecretCmd.Flags().String(walletFlag, "", "Path to the wallet that will be owner of the credentials")
+	updateSecretCmd.Flags().String(addressFlag, "", "Address of the wallet account")
+	updateSecretCmd.Flags().String(peerFlag, "", "Address of a frostfs peer to connect to")
+	updateSecretCmd.Flags().String(gateWalletFlag, "", "Path to the s3 gateway wallet to decrypt accessbox")
+	updateSecretCmd.Flags().String(gateAddressFlag, "", "Address of the s3 gateway wallet account")
+	updateSecretCmd.Flags().String(accessKeyIDFlag, "", "Access key id of s3 credential for which secret must be obtained")
+	updateSecretCmd.Flags().StringSlice(gatePublicKeyFlag, nil, "Public 256r1 key of a gate (use flags repeatedly for multiple gates or separate them by comma)")
+	updateSecretCmd.Flags().Duration(poolDialTimeoutFlag, defaultPoolDialTimeout, "Timeout for connection to the node in pool to be established")
+	updateSecretCmd.Flags().Duration(poolHealthcheckTimeoutFlag, defaultPoolHealthcheckTimeout, "Timeout for request to node to decide if it is alive")
+	updateSecretCmd.Flags().Duration(poolRebalanceIntervalFlag, defaultPoolRebalanceInterval, "Interval for updating nodes health status")
+	updateSecretCmd.Flags().Duration(poolStreamTimeoutFlag, defaultPoolStreamTimeout, "Timeout for individual operation in streaming RPC")
+
+	_ = updateSecretCmd.MarkFlagRequired(walletFlag)
+	_ = updateSecretCmd.MarkFlagRequired(peerFlag)
+	_ = updateSecretCmd.MarkFlagRequired(gateWalletFlag)
+	_ = updateSecretCmd.MarkFlagRequired(accessKeyIDFlag)
+	_ = updateSecretCmd.MarkFlagRequired(gatePublicKeyFlag)
+}
+
+func runUpdateSecretCmd(cmd *cobra.Command, _ []string) error {
+	ctx, cancel := context.WithTimeout(cmd.Context(), viper.GetDuration(timeoutFlag))
+	defer cancel()
+
+	log := getLogger()
+
+	password := wallet.GetPassword(viper.GetViper(), walletPassphraseCfg)
+	key, err := wallet.GetKeyFromPath(viper.GetString(walletFlag), viper.GetString(addressFlag), password)
+	if err != nil {
+		return fmt.Errorf("failed to load frostfs private key: %s", err)
+	}
+
+	gatePassword := wallet.GetPassword(viper.GetViper(), walletGatePassphraseCfg)
+	gateKey, err := wallet.GetKeyFromPath(viper.GetString(gateWalletFlag), viper.GetString(gateAddressFlag), gatePassword)
+	if err != nil {
+		return fmt.Errorf("failed to load s3 gate private key: %s", err)
+	}
+
+	var accessBoxAddress oid.Address
+	credAddr := strings.Replace(viper.GetString(accessKeyIDFlag), "0", "/", 1)
+	if err = accessBoxAddress.DecodeString(credAddr); err != nil {
+		return fmt.Errorf("failed to parse creds address: %w", err)
+	}
+
+	var gatesPublicKeys []*keys.PublicKey
+	for _, keyStr := range viper.GetStringSlice(gatePublicKeyFlag) {
+		gpk, err := keys.NewPublicKeyFromString(keyStr)
+		if err != nil {
+			return fmt.Errorf("failed to load gate's public key: %s", err)
+		}
+		gatesPublicKeys = append(gatesPublicKeys, gpk)
+	}
+
+	poolCfg := PoolConfig{
+		Key:                key,
+		Address:            viper.GetString(peerFlag),
+		DialTimeout:        viper.GetDuration(poolDialTimeoutFlag),
+		HealthcheckTimeout: viper.GetDuration(poolHealthcheckTimeoutFlag),
+		StreamTimeout:      viper.GetDuration(poolStreamTimeoutFlag),
+		RebalanceInterval:  viper.GetDuration(poolRebalanceIntervalFlag),
+	}
+
+	frostFS, err := createFrostFS(ctx, log, poolCfg)
+	if err != nil {
+		return fmt.Errorf("failed to create FrostFS component: %s", err)
+	}
+
+	updateSecretOptions := &authmate.UpdateSecretOptions{
+		Address:         accessBoxAddress,
+		FrostFSKey:      key,
+		GatesPublicKeys: gatesPublicKeys,
+		GatePrivateKey:  gateKey,
+	}
+
+	if err = authmate.New(log, frostFS).UpdateSecret(ctx, os.Stdout, updateSecretOptions); err != nil {
+		return fmt.Errorf("failed to update secret: %s", err)
+	}
+	return nil
+}

cmd/s3-authmate/modules/utils.go

@@ -0,0 +1,142 @@
+package modules
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+type PoolConfig struct {
+	Key                *keys.PrivateKey
+	Address            string
+	DialTimeout        time.Duration
+	HealthcheckTimeout time.Duration
+	StreamTimeout      time.Duration
+	RebalanceInterval  time.Duration
+}
+
+func createFrostFS(ctx context.Context, log *zap.Logger, cfg PoolConfig) (authmate.FrostFS, error) {
+	log.Debug("prepare connection pool")
+
+	var prm pool.InitParameters
+	prm.SetKey(&cfg.Key.PrivateKey)
+	prm.SetNodeDialTimeout(cfg.DialTimeout)
+	prm.SetHealthcheckTimeout(cfg.HealthcheckTimeout)
+	prm.SetNodeStreamTimeout(cfg.StreamTimeout)
+	prm.SetClientRebalanceInterval(cfg.RebalanceInterval)
+	prm.SetLogger(log)
+	prm.AddNode(pool.NewNodeParam(1, cfg.Address, 1))
+
+	p, err := pool.NewPool(prm)
+	if err != nil {
+		return nil, fmt.Errorf("create pool: %w", err)
+	}
+
+	if err = p.Dial(ctx); err != nil {
+		return nil, fmt.Errorf("dial pool: %w", err)
+	}
+
+	return frostfs.NewAuthmateFrostFS(p, cfg.Key), nil
+}
+
+func parsePolicies(val string) (authmate.ContainerPolicies, error) {
+	if val == "" {
+		return nil, nil
+	}
+
+	var (
+		data = []byte(val)
+		err  error
+	)
+
+	if !json.Valid(data) {
+		if data, err = os.ReadFile(val); err != nil {
+			return nil, fmt.Errorf("coudln't read json file or provided json is invalid")
+		}
+	}
+
+	var policies authmate.ContainerPolicies
+	if err = json.Unmarshal(data, &policies); err != nil {
+		return nil, fmt.Errorf("unmarshal policies: %w", err)
+	}
+	if _, ok := policies[api.DefaultLocationConstraint]; ok {
+		return nil, fmt.Errorf("config overrides %s location constraint", api.DefaultLocationConstraint)
+	}
+
+	return policies, nil
+}
+
+func getJSONRules(val string) ([]byte, error) {
+	if val == "" {
+		return nil, nil
+	}
+	data := []byte(val)
+	if json.Valid(data) {
+		return data, nil
+	}
+
+	if data, err := os.ReadFile(val); err == nil {
+		if json.Valid(data) {
+			return data, nil
+		}
+	}
+
+	return nil, fmt.Errorf("coudln't read json file or provided json is invalid")
+}
+
+// getSessionRules reads json session rules.
+// It returns true if rules must be skipped.
+func getSessionRules(r string) ([]byte, bool, error) {
+	if r == "none" {
+		return nil, true, nil
+	}
+
+	data, err := getJSONRules(r)
+	return data, false, err
+}
+
+// getLogger returns new logger depending on appropriate values in viper.Viper
+// if logger cannot be built it panics.
+func getLogger() *zap.Logger {
+	if !viper.GetBool(withLogFlag) {
+		return zap.NewNop()
+	}
+
+	var zapConfig = zap.Config{
+		Development: true,
+		Encoding:    "console",
+		Level:       zap.NewAtomicLevelAt(zapcore.FatalLevel),
+		OutputPaths: []string{"stdout"},
+		EncoderConfig: zapcore.EncoderConfig{
+			MessageKey:   "message",
+			LevelKey:     "level",
+			EncodeLevel:  zapcore.CapitalLevelEncoder,
+			TimeKey:      "time",
+			EncodeTime:   zapcore.ISO8601TimeEncoder,
+			CallerKey:    "caller",
+			EncodeCaller: zapcore.ShortCallerEncoder,
+		},
+	}
+
+	if viper.GetBool(debugFlag) {
+		zapConfig.Level = zap.NewAtomicLevelAt(zapcore.DebugLevel)
+	}
+
+	log, err := zapConfig.Build()
+	if err != nil {
+		panic(fmt.Errorf("create logger: %w", err))
+	}
+
+	return log
+}

cmd/s3-gw/app.go

@@ -10,6 +10,7 @@ import (
 	"os/signal"
 	"strconv"
 	"sync"
+	"sync/atomic"
 	"syscall"
 	"time"
 
@@ -32,12 +33,13 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
 	treepool "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree"
-	"github.com/gorilla/mux"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/credentials/insecure"
 )
 
 type (
@@ -59,7 +61,6 @@ type (
 		bucketResolver *resolver.BucketResolver
 		services       []*Service
 		settings       *appSettings
-		maxClients     api.MaxClients
 
 		webDone chan struct{}
 		wrkDone chan struct{}
@@ -69,6 +70,13 @@ type (
 		logLevel                      zap.AtomicLevel
 		policies                      *placementPolicy
 		xmlDecoder                    *xml.DecoderProvider
+		maxClient                     maxClientsConfig
+		bypassContentEncodingInChunks atomic.Bool
+	}
+
+	maxClientsConfig struct {
+		deadline time.Duration
+		count    int
 	}
 
 	Logger struct {
@@ -89,7 +97,7 @@ func newApp(ctx context.Context, log *Logger, v *viper.Viper) *App {
 	objPool, treePool, key := getPools(ctx, log.logger, v)
 
 	// prepare auth center
-	ctr := auth.New(frostfs.NewAuthmateFrostFS(objPool), key, v.GetStringSlice(cfgAllowedAccessKeyIDPrefixes), getAccessBoxCacheConfig(v, log.logger))
+	ctr := auth.New(frostfs.NewAuthmateFrostFS(objPool, key), key, v.GetStringSlice(cfgAllowedAccessKeyIDPrefixes), getAccessBoxCacheConfig(v, log.logger))
 
 	app := &App{
 		ctr:      ctr,
@@ -102,7 +110,6 @@ func newApp(ctx context.Context, log *Logger, v *viper.Viper) *App {
 		webDone: make(chan struct{}, 1),
 		wrkDone: make(chan struct{}, 1),
 
-		maxClients: newMaxClients(v),
 		settings: newAppSettings(log, v),
 	}
 
@@ -127,17 +134,21 @@ func (a *App) initLayer(ctx context.Context) {
 		a.log.Fatal("couldn't generate random key", zap.Error(err))
 	}
 
+	var gateOwner user.ID
+	user.IDFromKey(&gateOwner, a.key.PrivateKey.PublicKey)
+
 	layerCfg := &layer.Config{
 		Caches: getCacheOptions(a.cfg, a.log),
 		AnonKey: layer.AnonymousKey{
 			Key: randomKey,
 		},
+		GateOwner:   gateOwner,
 		Resolver:    a.bucketResolver,
 		TreeService: tree.NewTree(services.NewPoolWrapper(a.treePool), a.log),
 	}
 
 	// prepare object layer
-	a.obj = layer.NewLayer(a.log, frostfs.NewFrostFS(a.pool), layerCfg)
+	a.obj = layer.NewLayer(a.log, frostfs.NewFrostFS(a.pool, a.key), layerCfg)
 
 	if a.cfg.GetBool(cfgEnableNATS) {
 		nopts := getNotificationsOptions(a.cfg, a.log)
@@ -158,11 +169,24 @@ func newAppSettings(log *Logger, v *viper.Viper) *appSettings {
 		log.logger.Fatal("failed to create new policy mapping", zap.Error(err))
 	}
 
-	return &appSettings{
+	settings := &appSettings{
 		logLevel:   log.lvl,
 		policies:   policies,
 		xmlDecoder: xml.NewDecoderProvider(v.GetBool(cfgKludgeUseDefaultXMLNSForCompleteMultipartUpload)),
+		maxClient:  newMaxClients(v),
 	}
+
+	settings.setBypassContentEncodingInChunks(v.GetBool(cfgKludgeBypassContentEncodingCheckInChunks))
+
+	return settings
+}
+
+func (s *appSettings) BypassContentEncodingInChunks() bool {
+	return s.bypassContentEncodingInChunks.Load()
+}
+
+func (s *appSettings) setBypassContentEncodingInChunks(bypass bool) {
+	s.bypassContentEncodingInChunks.Store(bypass)
 }
 
 func getDefaultPolicyValue(v *viper.Viper) string {
@@ -243,18 +267,20 @@ func (a *App) shutdownTracing() {
 	}
 }
 
-func newMaxClients(cfg *viper.Viper) api.MaxClients {
-	maxClientsCount := cfg.GetInt(cfgMaxClientsCount)
-	if maxClientsCount <= 0 {
-		maxClientsCount = defaultMaxClientsCount
+func newMaxClients(cfg *viper.Viper) maxClientsConfig {
+	config := maxClientsConfig{}
+
+	config.count = cfg.GetInt(cfgMaxClientsCount)
+	if config.count <= 0 {
+		config.count = defaultMaxClientsCount
 	}
 
-	maxClientsDeadline := cfg.GetDuration(cfgMaxClientsDeadline)
-	if maxClientsDeadline <= 0 {
-		maxClientsDeadline = defaultMaxClientsDeadline
+	config.deadline = cfg.GetDuration(cfgMaxClientsDeadline)
+	if config.deadline <= 0 {
+		config.deadline = defaultMaxClientsDeadline
 	}
 
-	return api.NewMaxClientsMiddleware(maxClientsCount, maxClientsDeadline)
+	return config
 }
 
 func getPools(ctx context.Context, logger *zap.Logger, cfg *viper.Viper) (*pool.Pool, *treepool.Pool, *keys.PrivateKey) {
@@ -313,7 +339,7 @@ func getPools(ctx context.Context, logger *zap.Logger, cfg *viper.Viper) (*pool.
 	prmTree.SetLogger(logger)
 
 	var apiGRPCDialOpts []grpc.DialOption
-	var treeGRPCDialOpts = []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
+	var treeGRPCDialOpts []grpc.DialOption
 	if cfg.GetBool(cfgTracingEnabled) {
 		interceptors := []grpc.DialOption{
 			grpc.WithUnaryInterceptor(grpctracing.NewUnaryClientInteceptor()),
@@ -491,12 +517,18 @@ func (a *App) Serve(ctx context.Context) {
 	// Attach S3 API:
 	domains := a.cfg.GetStringSlice(cfgListenDomains)
 	a.log.Info("fetch domains, prepare to use API", zap.Strings("domains", domains))
-	router := mux.NewRouter().SkipClean(true).UseEncodedPath()
-	api.Attach(router, domains, a.maxClients, a.api, a.ctr, a.log, a.metrics)
+
+	throttleOps := middleware.ThrottleOpts{
+		Limit:          a.settings.maxClient.count,
+		BacklogTimeout: a.settings.maxClient.deadline,
+	}
+
+	chiRouter := chi.NewRouter()
+	api.AttachChi(chiRouter, domains, throttleOps, a.api, a.ctr, a.log, a.metrics)
 
 	// Use mux.Router as http.Handler
 	srv := new(http.Server)
-	srv.Handler = router
+	srv.Handler = chiRouter
 	srv.ErrorLog = zap.NewStdLog(a.log)
 
 	a.startServices()
@@ -582,6 +614,7 @@ func (a *App) updateSettings() {
 	a.settings.policies.update(a.log, a.cfg)
 
 	a.settings.xmlDecoder.UseDefaultNamespaceForCompleteMultipart(a.cfg.GetBool(cfgKludgeUseDefaultXMLNSForCompleteMultipartUpload))
+	a.settings.setBypassContentEncodingInChunks(a.cfg.GetBool(cfgKludgeBypassContentEncodingCheckInChunks))
 }
 
 func (a *App) startServices() {
@@ -770,6 +803,7 @@ func (a *App) initHandler() {
 	}
 
 	cfg.CompleteMultipartKeepalive = a.cfg.GetDuration(cfgKludgeCompleteMultipartUploadKeepalive)
+	cfg.Kludge = a.settings
 
 	var err error
 	a.api, err = handler.New(a.log, a.obj, a.nc, cfg)

cmd/s3-gw/app_settings.go

@@ -120,6 +120,7 @@ const ( // Settings.
 	// Kludge.
 	cfgKludgeUseDefaultXMLNSForCompleteMultipartUpload = "kludge.use_default_xmlns_for_complete_multipart"
 	cfgKludgeCompleteMultipartUploadKeepalive          = "kludge.complete_multipart_keepalive"
+	cfgKludgeBypassContentEncodingCheckInChunks        = "kludge.bypass_content_encoding_check_in_chunks"
 
 	// Command line args.
 	cmdHelp      = "help"
@@ -306,6 +307,7 @@ func newSettings() *viper.Viper {
 	// kludge
 	v.SetDefault(cfgKludgeUseDefaultXMLNSForCompleteMultipartUpload, false)
 	v.SetDefault(cfgKludgeCompleteMultipartUploadKeepalive, 10*time.Second)
+	v.SetDefault(cfgKludgeBypassContentEncodingCheckInChunks, false)
 
 	// Bind flags
 	if err := bindFlags(v, flags); err != nil {

config/config.env

@@ -138,6 +138,8 @@ S3_GW_RESOLVE_BUCKET_ALLOW=container
 S3_GW_KLUDGE_USE_DEFAULT_XMLNS_FOR_COMPLETE_MULTIPART=false
 # Set timeout between whitespace transmissions during CompleteMultipartUpload processing.
 S3_GW_KLUDGE_COMPLETE_MULTIPART_KEEPALIVE=10s
+# Use this flag to be able to use chunked upload approach without having `aws-chunked` value in `Content-Encoding` header.
+S3_GW_BYPASS_CONTENT_ENCODING_CHECK_IN_CHUNKS=false
 
 S3_GW_TRACING_ENABLED=false
 S3_GW_TRACING_ENDPOINT="localhost:4318"

config/config.yaml

@@ -167,3 +167,5 @@ kludge:
   use_default_xmlns_for_complete_multipart: false
   # Set timeout between whitespace transmissions during CompleteMultipartUpload processing.
   complete_multipart_keepalive: 10s
+  # Use this flag to be able to use chunked upload approach without having `aws-chunked` value in `Content-Encoding` header.
+  bypass_content_encoding_check_in_chunks: false

docs/authmate.md

@@ -26,6 +26,7 @@ potentially).
    4. [Containers policy](#containers-policy)
 3. [Obtainment of a secret](#obtaining-credential-secrets)
 4. [Generate presigned url](#generate-presigned-url)
+5. [Update secrets](#update-secret)
 
 ## Generation of wallet
 
@@ -334,3 +335,39 @@ $ aws s3 --endpoint http://localhost:8084 presign s3://pregigned/obj
 
 http://localhost:8084/pregigned/obj?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=6UpmiuYspPLMWfyhEKYmZQSsTGkFLS5MhQVdsda3fhz908Hw9eo9urTmaJtfvHMHUpY8SWAptk61bns2Js8f1M5tZ%2F20220615%2Fus-east-2%2Fs3%2Faws4_request&X-Amz-Date=20220615T072348Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=b82c13952534b1bba699a718f2d42d135c2833a1e64030d4ce0e198af46551d4
 ```
+
+## Update secret
+You can extend list of s3 gates that can accept already issued credentials.
+To do this use `frostfs-s3-authmate update-secret` command:
+
+**Required parameters:**
+* `--wallet` is a path to a user wallet `.json` file. You can provide a passphrase to decrypt
+  a wallet via environment variable `AUTHMATE_WALLET_PASSPHRASE`, or you will be asked to enter a passphrase
+  interactively. You can also specify an account address to use from a wallet using the `--address` parameter.
+* `--gate-wallet` is a path to a gate wallet `.json` file (need to decrypt current access box version). You can provide a passphrase to decrypt
+  a wallet via environment variable `AUTHMATE_WALLET_GATE_PASSPHRASE`, or you will be asked to enter a passphrase
+  interactively. You can also specify an account address to use from a wallet using the `--gate-address` parameter.
+* `--peer` is an address of a FrostFS peer to connect to
+* `--gate-public-key` is a  public `secp256r1` 33-byte short key of a gate (use flags repeatedly for multiple gates).
+* `--access-key-id` is a credential id to update.  
+
+```shell
+$ frostfs-s3-authmate update-secret --wallet wallet.json --gate-wallet s3-wallet.json \
+ --peer 192.168.130.71:8080 \
+ --gate-public-key 0313b1ac3a8076e155a7e797b24f0b650cccad5941ea59d7cfd51a024a8b2a06bf \
+ --gate-public-key 0317585fa8274f7afdf1fc5f2a2e7bece549d5175c4e5182e37924f30229aef967 \
+ --gate-public-key 0223450b9db6d0c083e9c6de1f7d8fd22858d70829e09afa39828bb2416bf190fc \
+ --access-key-id HwrdXgetdGcEWAQwi68r1PMvw4iSm1Y5Z1fsFNSD6sQP04QomYDfYsspMhENEDhzTGwGxm86Q6R2Weugf3PG4sJ3M
+
+Enter password for wallet.json >
+Enter password for s3-wallet.json >
+
+{
+  "initial_access_key_id": "HwrdXgetdGcEWAQwi68r1PMvw4iSm1Y5Z1fsFNSD6sQP04QomYDfYsspMhENEDhzTGwGxm86Q6R2Weugf3PG4sJ3M",
+  "access_key_id": "HwrdXgetdGcEWAQwi68r1PMvw4iSm1Y5Z1fsFNSD6sQP0xXf1ahGndNkydG9MrL9WmCebrPwdSHTAysQa9w6yCNJ",
+  "secret_access_key": "f6a65481fd2752e69e4aa80a6fdcad70cfbf8304d2b3b8c2f9c15212aeee3ae7",
+  "owner_private_key": "7f40233893e4f4a54e4f2f52455a0e6d563f7eb0233a985094937ed69faef681",
+  "wallet_public_key": "031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a",
+  "container_id": "HwrdXgetdGcEWAQwi68r1PMvw4iSm1Y5Z1fsFNSD6sQP"
+}
+```

docs/configuration.md

@@ -536,9 +536,11 @@ Workarounds for non-standard use cases.
 kludge:
   use_default_xmlns_for_complete_multipart: false
   complete_multipart_keepalive: 10s
+  bypass_content_encoding_check_in_chunks: false
 ```
 
 | Parameter                                  | Type       | SIGHUP reload | Default value | Description                                                                                                                                                                                      |
-|--------------------------------------------|------------|---------------|---------------|-----------------------------------------------------------------------------------------------------------------------------|
+|--------------------------------------------|------------|---------------|---------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `use_default_xmlns_for_complete_multipart` | `bool`     | yes           | false         | Enable using default xml namespace `http://s3.amazonaws.com/doc/2006-03-01/` when parse `CompleteMultipartUpload` xml body.                                                                      |
 | `complete_multipart_keepalive`             | `duration` | no            | 10s           | Set timeout between whitespace transmissions during CompleteMultipartUpload processing.                                                                                                          |
+| `bypass_content_encoding_check_in_chunks`  | `bool`     | yes           | false         | Use this flag to be able to use [chunked upload approach](https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-streaming.html) without having `aws-chunked` value in `Content-Encoding` header. |

go.mod

@@ -3,19 +3,20 @@ module git.frostfs.info/TrueCloudLab/frostfs-s3-gw
 go 1.19
 
 require (
-	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230531114046-62edd68f47ac
+	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230802075510-964c3edb3f44
 	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6
-	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230608140155-9d40228cecbe
+	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230802103237-363f153eafa6
 	github.com/aws/aws-sdk-go v1.44.6
 	github.com/bluele/gcache v0.0.2
+	github.com/go-chi/chi/v5 v5.0.8
 	github.com/google/uuid v1.3.0
-	github.com/gorilla/mux v1.8.0
 	github.com/minio/sio v0.3.0
 	github.com/nats-io/nats.go v1.13.1-0.20220121202836-972a071d373d
-	github.com/nspcc-dev/neo-go v0.101.1
+	github.com/nspcc-dev/neo-go v0.101.2-0.20230601131642-a0117042e8fc
 	github.com/panjf2000/ants/v2 v2.5.0
 	github.com/prometheus/client_golang v1.15.1
 	github.com/prometheus/client_model v0.3.0
+	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.15.0
 	github.com/stretchr/testify v1.8.3
@@ -52,6 +53,7 @@ require (
 	github.com/hashicorp/golang-lru v0.6.0 // indirect
 	github.com/hashicorp/golang-lru/v2 v2.0.2 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
@@ -61,7 +63,7 @@ require (
 	github.com/nats-io/nkeys v0.3.0 // indirect
 	github.com/nats-io/nuid v1.0.1 // indirect
 	github.com/nspcc-dev/go-ordered-json v0.0.0-20220111165707-25110be27d22 // indirect
-	github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20221202075445-cb5c18dc73eb // indirect
+	github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20230615193820-9185820289ce // indirect
 	github.com/nspcc-dev/rfc6979 v0.2.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.6 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect

go.sum

@@ -36,16 +36,16 @@ cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RX
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3fOKtUw0Xmo=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230531114046-62edd68f47ac h1:a6/Zc5BejflmguShwbllgJdEehnM9gshkLrLbKQHCU0=
-git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230531114046-62edd68f47ac/go.mod h1:pKJJRLOChW4zDQsAt1e8k/snWKljJtpkiPfxV53ngjI=
+git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230802075510-964c3edb3f44 h1:v6JqBD/VzZx3QSxbaXnUwnnJ1KEYheU4LzLGr3IhsAE=
+git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230802075510-964c3edb3f44/go.mod h1:pKJJRLOChW4zDQsAt1e8k/snWKljJtpkiPfxV53ngjI=
 git.frostfs.info/TrueCloudLab/frostfs-contract v0.0.0-20230307110621-19a8ef2d02fb h1:S/TrbOOu9qEXZRZ9/Ddw7crnxbBUQLo68PSzQWYrc9M=
 git.frostfs.info/TrueCloudLab/frostfs-contract v0.0.0-20230307110621-19a8ef2d02fb/go.mod h1:nkR5gaGeez3Zv2SE7aceP0YwxG2FzIB5cGKpQO2vV2o=
 git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0 h1:FxqFDhQYYgpe41qsIHVOcdzSVCB8JNSfPG7Uk4r2oSk=
 git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0/go.mod h1:RUIKZATQLJ+TaYQa60X2fTDwfuhMfm8Ar60bQ5fr+vU=
 git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6 h1:aGQ6QaAnTerQ5Dq5b2/f9DUQtSqPkZZ/bkMx/HKuLCo=
 git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6/go.mod h1:W8Nn08/l6aQ7UlIbpF7FsQou7TVpcRD1ZT1KG4TrFhE=
-git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230608140155-9d40228cecbe h1:47lrWXcl36ayN7AJ9IW7sDDnTj//RUyHoIZOsjbYAYA=
-git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230608140155-9d40228cecbe/go.mod h1:w+s3ozlbFfTDFHhjX0A3Iif3BRtnTkwiACxFZD+Q0cQ=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230802103237-363f153eafa6 h1:u6lzNotV6MEMNEG/XeS7g+FjPrrf+j4gnOHtvun2KJc=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230802103237-363f153eafa6/go.mod h1:LI2GOj0pEx0jYTjB3QHja2PNhQFYL2pCm71RAFwDv0M=
 git.frostfs.info/TrueCloudLab/hrw v1.2.1 h1:ccBRK21rFvY5R1WotI6LNoPlizk7qSvdfD8lNIRudVc=
 git.frostfs.info/TrueCloudLab/hrw v1.2.1/go.mod h1:C1Ygde2n843yTZEQ0FP69jYiuaYV0kriLvP4zm8JuvM=
 git.frostfs.info/TrueCloudLab/rfc6979 v0.4.0 h1:M2KR3iBj7WpY3hP10IevfIB9MURr4O9mwVfJ+SjT3HA=
@@ -143,12 +143,14 @@ github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5Kwzbycv
 github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:rZfgFAXFS/z/lEd6LJmf9HVZ1LkgYiHx5pHhV5DR16M=
 github.com/frankban/quicktest v1.14.0/go.mod h1:NeW+ay9A/U67EYXNFA1nPE8e/tnQv/09mUdL/ijj8og=
-github.com/frankban/quicktest v1.14.3 h1:FJKSZTDHjyhriyC81FLQ0LY93eSai0ZyR/ZIkd3ZUKE=
+github.com/frankban/quicktest v1.14.5 h1:dfYrrRyLtiqT9GyKXgdh+k4inNeTvmGbuSgZ3lx3GhA=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
 github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0=
+github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
@@ -243,8 +245,6 @@ github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8/go.mod h1:dvDLG8qkwmyD9a/MJJN3XJcT3xFxOKAvTZGvuZmac9g=
-github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
-github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
@@ -264,6 +264,8 @@ github.com/holiman/uint256 v1.2.0/go.mod h1:y4ga/t+u+Xwd7CpDgZESaRcWy0I7XMlTMA25
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/jessevdk/go-flags v0.0.0-20141203071132-1679536dcc89/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
@@ -345,11 +347,11 @@ github.com/nspcc-dev/hrw v1.0.9/go.mod h1:l/W2vx83vMQo6aStyx2AuZrJ+07lGv2JQGlVkP
 github.com/nspcc-dev/neo-go v0.73.1-pre.0.20200303142215-f5a1b928ce09/go.mod h1:pPYwPZ2ks+uMnlRLUyXOpLieaDQSEaf4NM3zHVbRjmg=
 github.com/nspcc-dev/neo-go v0.98.0/go.mod h1:E3cc1x6RXSXrJb2nDWXTXjnXk3rIqVN8YdFyWv+FrqM=
 github.com/nspcc-dev/neo-go v0.99.4/go.mod h1:mKTolfRUfKjFso5HPvGSQtUZc70n0VKBMs16eGuC5gA=
-github.com/nspcc-dev/neo-go v0.101.1 h1:TVdcIpH/+bxQBTLRwWE3+Pw3j6j/JwguENbBSGAGid0=
-github.com/nspcc-dev/neo-go v0.101.1/go.mod h1:J4tspxWw7jknX06F+VSMsKvIiNpYGfVTb2IxVC005YU=
+github.com/nspcc-dev/neo-go v0.101.2-0.20230601131642-a0117042e8fc h1:fySIWvUQsitK5e5qYIHnTDCXuPpwzz89SEUEIyY11sg=
+github.com/nspcc-dev/neo-go v0.101.2-0.20230601131642-a0117042e8fc/go.mod h1:s9QhjMC784MWqTURovMbyYduIJc86mnCruxcMiAebpc=
 github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20220927123257-24c107e3a262/go.mod h1:23bBw0v6pBYcrWs8CBEEDIEDJNbcFoIh8pGGcf2Vv8s=
-github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20221202075445-cb5c18dc73eb h1:GFxfkpXEYAbMIr69JpKOsQWeLOaGrd49HNAor8uDW+A=
-github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20221202075445-cb5c18dc73eb/go.mod h1:23bBw0v6pBYcrWs8CBEEDIEDJNbcFoIh8pGGcf2Vv8s=
+github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20230615193820-9185820289ce h1:vLGuUNDkmQrWMa4rr4vTd1u8ULqejWxVmNz1L7ocTEI=
+github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20230615193820-9185820289ce/go.mod h1:ZUuXOkdtHZgaC13za/zMgXfQFncZ0jLzfQTe+OsDOtg=
 github.com/nspcc-dev/neofs-api-go/v2 v2.11.0-pre.0.20211201134523-3604d96f3fe1/go.mod h1:oS8dycEh8PPf2Jjp6+8dlwWyEv2Dy77h/XhhcdxYEFs=
 github.com/nspcc-dev/neofs-api-go/v2 v2.11.1/go.mod h1:oS8dycEh8PPf2Jjp6+8dlwWyEv2Dy77h/XhhcdxYEFs=
 github.com/nspcc-dev/neofs-crypto v0.2.0/go.mod h1:F/96fUzPM3wR+UGsPi3faVNmFlA9KAEAUQR7dMxZmNA=
@@ -433,6 +435,8 @@ github.com/spf13/afero v1.9.3 h1:41FoI0fD7OR7mGcKE/aOiLkGreyf8ifIOQmJANWogMk=
 github.com/spf13/afero v1.9.3/go.mod h1:iUV7ddyEEZPO5gA3zD4fJt6iStLlL+Lg4m2cihcDf8Y=
 github.com/spf13/cast v1.5.0 h1:rj3WzYc11XZaIZMPKmwP96zkFEnnAmV8s6XbB2aY32w=
 github.com/spf13/cast v1.5.0/go.mod h1:SpXXQ5YoyJw6s3/6cMTQuxvgRl3PCJiyaX9p6b155UU=
+github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
+github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
 github.com/spf13/jwalterweatherman v1.1.0 h1:ue6voC5bR5F8YxI5S67j9i582FU4Qvo2bmqnqMYADFk=
 github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=

internal/frostfs/authmate.go

@@ -17,6 +17,7 @@ import (
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 const (
@@ -29,8 +30,8 @@ type AuthmateFrostFS struct {
 }
 
 // NewAuthmateFrostFS creates new AuthmateFrostFS using provided pool.Pool.
-func NewAuthmateFrostFS(p *pool.Pool) *AuthmateFrostFS {
-	return &AuthmateFrostFS{frostFS: NewFrostFS(p)}
+func NewAuthmateFrostFS(p *pool.Pool, key *keys.PrivateKey) *AuthmateFrostFS {
+	return &AuthmateFrostFS{frostFS: NewFrostFS(p, key)}
 }
 
 // ContainerExists implements authmate.FrostFS interface method.
@@ -116,7 +117,6 @@ func (x *AuthmateFrostFS) CreateObject(ctx context.Context, prm tokens.PrmObject
 	}
 
 	return x.frostFS.CreateObject(ctx, layer.PrmObjectCreate{
-		Creator:    prm.Creator,
 		Container:  prm.Container,
 		Filepath:   prm.Filepath,
 		Attributes: attributes,

internal/frostfs/frostfs.go

@@ -12,6 +12,7 @@ import (
 	objectv2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	errorsFrost "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/acl"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
@@ -21,6 +22,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 // FrostFS represents virtual connection to the FrostFS network.
@@ -29,6 +31,7 @@ import (
 type FrostFS struct {
 	pool  *pool.Pool
 	await pool.WaitParams
+	owner user.ID
 }
 
 const (
@@ -37,14 +40,18 @@ const (
 )
 
 // NewFrostFS creates new FrostFS using provided pool.Pool.
-func NewFrostFS(p *pool.Pool) *FrostFS {
+func NewFrostFS(p *pool.Pool, key *keys.PrivateKey) *FrostFS {
 	var await pool.WaitParams
 	await.SetPollInterval(defaultPollInterval)
 	await.SetTimeout(defaultPollTimeout)
 
+	var owner user.ID
+	user.IDFromKey(&owner, key.PrivateKey.PublicKey)
+
 	return &FrostFS{
 		pool:  p,
 		await: await,
+		owner: owner,
 	}
 }
 
@@ -136,12 +143,12 @@ func (x *FrostFS) CreateContainer(ctx context.Context, prm layer.PrmContainerCre
 		return cid.ID{}, handleObjectError("sync container with the network state", err)
 	}
 
-	var prmPut pool.PrmContainerPut
-	prmPut.SetContainer(cnr)
-	prmPut.SetWaitParams(x.await)
-
-	if prm.SessionToken != nil {
-		prmPut.WithinSession(*prm.SessionToken)
+	prmPut := pool.PrmContainerPut{
+		ClientParams: client.PrmContainerPut{
+			Container: &cnr,
+			Session:   prm.SessionToken,
+		},
+		WaitParams: &x.await,
 	}
 
 	// send request to save the container
@@ -237,7 +244,7 @@ func (x *FrostFS) CreateObject(ctx context.Context, prm layer.PrmObjectCreate) (
 
 	obj := object.New()
 	obj.SetContainerID(prm.Container)
-	obj.SetOwnerID(&prm.Creator)
+	obj.SetOwnerID(&x.owner)
 	obj.SetAttributes(attrs...)
 	obj.SetPayloadSize(prm.PayloadSize)
 

internal/frostfs/services/pool_wrapper.go

@@ -6,8 +6,8 @@ import (
 	"fmt"
 	"io"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	errorsFrost "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/pkg/service/tree"
@@ -169,7 +169,7 @@ func (w *PoolWrapper) RemoveNode(ctx context.Context, bktInfo *data.BucketInfo,
 }
 
 func getBearer(ctx context.Context, bktInfo *data.BucketInfo) []byte {
-	if bd, ok := ctx.Value(api.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil {
+	if bd, ok := ctx.Value(middleware.BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil {
 		if bd.Gate.BearerToken != nil {
 			if bd.Gate.BearerToken.Impersonate() || bktInfo.Owner.Equals(bearer.ResolveIssuer(*bd.Gate.BearerToken)) {
 				return bd.Gate.BearerToken.Marshal()

metrics/desc.go

@@ -117,19 +117,13 @@ var appMetricsDesc = map[string]map[string]Description{
 			Help:           "Total number of s3 errors in current FrostFS S3 Gate instance",
 			VariableLabels: []string{"api"},
 		},
-		txBytesTotalMetric: Description{
+		bytesTotalMetric: Description{
 			Type:           dto.MetricType_GAUGE,
 			Namespace:      namespace,
 			Subsystem:      statisticSubsystem,
-			Name:      txBytesTotalMetric,
-			Help:      "Total number of bytes sent by current FrostFS S3 Gate instance",
-		},
-		rxBytesTotalMetric: Description{
-			Type:      dto.MetricType_GAUGE,
-			Namespace: namespace,
-			Subsystem: statisticSubsystem,
-			Name:      rxBytesTotalMetric,
-			Help:      "Total number of bytes received by current FrostFS S3 Gate instance",
+			Name:           bytesTotalMetric,
+			Help:           "Total number of bytes sent/received by current FrostFS S3 Gate instance",
+			VariableLabels: []string{"direction"},
 		},
 	},
 }

metrics/gate.go

@@ -16,7 +16,7 @@ type StatisticScraper interface {
 }
 
 type GateMetrics struct {
-	registry *prometheus.Registry
+	registry prometheus.Registerer
 	State    *StateMetrics
 	Pool     *poolMetricsCollector
 	Billing  *billingMetrics
@@ -24,7 +24,7 @@ type GateMetrics struct {
 }
 
 func NewGateMetrics(scraper StatisticScraper) *GateMetrics {
-	registry := prometheus.NewRegistry()
+	registry := prometheus.DefaultRegisterer
 
 	stateMetric := newStateMetrics()
 	registry.MustRegister(stateMetric)

metrics/stats.go

@@ -28,8 +28,7 @@ type (
 		currentS3RequestsDesc *prometheus.Desc
 		totalS3RequestsDesc   *prometheus.Desc
 		totalS3ErrorsDesc     *prometheus.Desc
-		txBytesTotalDesc      *prometheus.Desc
-		rxBytesTotalDesc      *prometheus.Desc
+		bytesTotalDesc        *prometheus.Desc
 	}
 
 	APIStatMetrics struct {
@@ -47,8 +46,12 @@ const (
 	requestsCurrentMetric = "requests_current"
 	requestsTotalMetric   = "requests_total"
 	errorsTotalMetric     = "errors_total"
-	txBytesTotalMetric    = "tx_bytes_total"
-	rxBytesTotalMetric    = "rx_bytes_total"
+	bytesTotalMetric      = "bytes_total"
+)
+
+const (
+	INDirection  = "IN"
+	OUTDirection = "OUT"
 )
 
 func newAPIStatMetrics() *APIStatMetrics {
@@ -132,8 +135,7 @@ func newHTTPStats() *httpStats {
 		currentS3RequestsDesc: newDesc(appMetricsDesc[statisticSubsystem][requestsCurrentMetric]),
 		totalS3RequestsDesc:   newDesc(appMetricsDesc[statisticSubsystem][requestsTotalMetric]),
 		totalS3ErrorsDesc:     newDesc(appMetricsDesc[statisticSubsystem][errorsTotalMetric]),
-		txBytesTotalDesc:      newDesc(appMetricsDesc[statisticSubsystem][txBytesTotalMetric]),
-		rxBytesTotalDesc:      newDesc(appMetricsDesc[statisticSubsystem][rxBytesTotalMetric]),
+		bytesTotalDesc:        newDesc(appMetricsDesc[statisticSubsystem][bytesTotalMetric]),
 	}
 }
 
@@ -141,8 +143,7 @@ func (s *httpStats) Describe(desc chan<- *prometheus.Desc) {
 	desc <- s.currentS3RequestsDesc
 	desc <- s.totalS3RequestsDesc
 	desc <- s.totalS3ErrorsDesc
-	desc <- s.txBytesTotalDesc
-	desc <- s.rxBytesTotalDesc
+	desc <- s.bytesTotalDesc
 }
 
 func (s *httpStats) Collect(ch chan<- prometheus.Metric) {
@@ -159,8 +160,8 @@ func (s *httpStats) Collect(ch chan<- prometheus.Metric) {
 	}
 
 	// Network Sent/Received Bytes (Outbound)
-	ch <- prometheus.MustNewConstMetric(s.txBytesTotalDesc, prometheus.CounterValue, float64(s.getInputBytes()))
-	ch <- prometheus.MustNewConstMetric(s.rxBytesTotalDesc, prometheus.CounterValue, float64(s.getOutputBytes()))
+	ch <- prometheus.MustNewConstMetric(s.bytesTotalDesc, prometheus.CounterValue, float64(s.getInputBytes()), INDirection)
+	ch <- prometheus.MustNewConstMetric(s.bytesTotalDesc, prometheus.CounterValue, float64(s.getOutputBytes()), OUTDirection)
 }
 
 // Inc increments the api stats counter.

pkg/service/tree/tree.go

@@ -9,9 +9,9 @@ import (
 	"strings"
 	"time"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
 	"go.uber.org/zap"
@@ -73,6 +73,7 @@ const (
 	lockConfigurationKV = "LockConfiguration"
 	oidKV               = "OID"
 
+	isCombinedKV    = "IsCombined"
 	isUnversionedKV = "IsUnversioned"
 	isTagKV         = "IsTag"
 	uploadIDKV      = "UploadId"
@@ -181,6 +182,7 @@ func newNodeVersion(filePath string, node NodeResponse) (*data.NodeVersion, erro
 func newNodeVersionFromTreeNode(filePath string, treeNode *treeNode) *data.NodeVersion {
 	_, isUnversioned := treeNode.Get(isUnversionedKV)
 	_, isDeleteMarker := treeNode.Get(isDeleteMarkerKV)
+	_, isCombined := treeNode.Get(isCombinedKV)
 	eTag, _ := treeNode.Get(etagKV)
 
 	version := &data.NodeVersion{
@@ -194,6 +196,7 @@ func newNodeVersionFromTreeNode(filePath string, treeNode *treeNode) *data.NodeV
 			FilePath:  filePath,
 		},
 		IsUnversioned: isUnversioned,
+		IsCombined:    isCombined,
 	}
 
 	if isDeleteMarker {
@@ -930,7 +933,6 @@ func (c *Tree) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartN
 		etagKV:       info.ETag,
 	}
 
-	var foundPartID uint64
 	for _, part := range parts {
 		if part.GetNodeID() == multipartNodeID {
 			continue
@@ -940,20 +942,15 @@ func (c *Tree) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartN
 			continue
 		}
 		if partInfo.Number == info.Number {
-			foundPartID = part.GetNodeID()
-			oldObjIDToDelete = partInfo.OID
-			break
+			return partInfo.OID, c.service.MoveNode(ctx, bktInfo, systemTree, part.GetNodeID(), multipartNodeID, meta)
 		}
 	}
 
-	if foundPartID != multipartNodeID {
 	if _, err = c.service.AddNode(ctx, bktInfo, systemTree, multipartNodeID, meta); err != nil {
 		return oid.ID{}, err
 	}
-		return oid.ID{}, layer.ErrNoNodeToRemove
-	}
 
-	return oldObjIDToDelete, c.service.MoveNode(ctx, bktInfo, systemTree, foundPartID, multipartNodeID, meta)
+	return oid.ID{}, layer.ErrNoNodeToRemove
 }
 
 func (c *Tree) GetParts(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfo, error) {
@@ -1073,6 +1070,10 @@ func (c *Tree) addVersion(ctx context.Context, bktInfo *data.BucketInfo, treeID
 		meta[createdKV] = strconv.FormatInt(version.DeleteMarker.Created.UTC().UnixMilli(), 10)
 	}
 
+	if version.IsCombined {
+		meta[isCombinedKV] = "true"
+	}
+
 	if version.IsUnversioned {
 		meta[isUnversionedKV] = "true"
 
@@ -1192,7 +1193,7 @@ func (c *Tree) getNode(ctx context.Context, bktInfo *data.BucketInfo, treeID str
 }
 
 func (c *Tree) reqLogger(ctx context.Context) *zap.Logger {
-	reqLogger := api.GetReqLog(ctx)
+	reqLogger := middleware.GetReqLog(ctx)
 	if reqLogger != nil {
 		return reqLogger
 	}