api/errors/errors.go

@@ -187,6 +187,9 @@ const (
 	ErrInvalidRequestLargeCopy
 	ErrInvalidStorageClass
 	VersionIDMarkerWithoutKeyMarker
+	ErrInvalidRangeLength
+	ErrRangeOutOfBounds
+	ErrMissingContentRange
 
 	ErrMalformedJSON
 	ErrInsecureClientRequest
@@ -1739,6 +1742,24 @@ var errorCodes = errorCodeMap{
 		Description:    "Part number must be an integer between 1 and 10000, inclusive",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrInvalidRangeLength: {
+		ErrCode:        ErrInvalidRangeLength,
+		Code:           "InvalidRange",
+		Description:    "Provided range length must be equal to content length",
+		HTTPStatusCode: http.StatusRequestedRangeNotSatisfiable,
+	},
+	ErrRangeOutOfBounds: {
+		ErrCode:        ErrRangeOutOfBounds,
+		Code:           "InvalidRange",
+		Description:    "Provided range is outside of object bounds",
+		HTTPStatusCode: http.StatusRequestedRangeNotSatisfiable,
+	},
+	ErrMissingContentRange: {
+		ErrCode:        ErrMissingContentRange,
+		Code:           "MissingContentRange",
+		Description:    "Content-Range header is mandatory for this type of request",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	// Add your error structure here.
 }
 

api/handler/get_test.go

@@ -228,6 +228,14 @@ func getObjectRange(t *testing.T, tc *handlerContext, bktName, objName string, s
 	return content
 }
 
+func getObjectVersion(tc *handlerContext, bktName, objName, version string) []byte {
+	w := getObjectBaseResponse(tc, bktName, objName, version)
+	assertStatus(tc.t, w, http.StatusOK)
+	content, err := io.ReadAll(w.Result().Body)
+	require.NoError(tc.t, err)
+	return content
+}
+
 func getObjectAssertS3Error(hc *handlerContext, bktName, objName, version string, code errors.ErrorCode) {
 	w := getObjectBaseResponse(hc, bktName, objName, version)
 	assertS3Error(hc.t, w, errors.GetAPIError(code))

api/handler/patch.go

@@ -0,0 +1,186 @@
+package handler
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+	"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"
+	"go.uber.org/zap"
+)
+
+const maxPatchSize = 5 * 1024 * 1024 * 1024
+
+func (h *handler) PatchObjectHandler(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	reqInfo := middleware.GetReqInfo(ctx)
+
+	if _, ok := r.Header[api.ContentRange]; !ok {
+		h.logAndSendError(w, "missing Content-Range", reqInfo, errors.GetAPIError(errors.ErrMissingContentRange))
+		return
+	}
+
+	if _, ok := r.Header[api.ContentLength]; !ok {
+		h.logAndSendError(w, "missing Content-Length", reqInfo, errors.GetAPIError(errors.ErrMissingContentLength))
+		return
+	}
+
+	conditional, err := parsePatchConditionalHeaders(r.Header)
+	if err != nil {
+		h.logAndSendError(w, "could not parse conditional headers", reqInfo, err)
+		return
+	}
+
+	bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
+		return
+	}
+
+	settings, err := h.obj.GetBucketSettings(ctx, bktInfo)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket settings", reqInfo, err)
+		return
+	}
+
+	srcObjPrm := &layer.HeadObjectParams{
+		Object:    reqInfo.ObjectName,
+		BktInfo:   bktInfo,
+		VersionID: reqInfo.URL.Query().Get(api.QueryVersionID),
+	}
+
+	extendedSrcObjInfo, err := h.obj.GetExtendedObjectInfo(ctx, srcObjPrm)
+	if err != nil {
+		h.logAndSendError(w, "could not find object", reqInfo, err)
+		return
+	}
+	srcObjInfo := extendedSrcObjInfo.ObjectInfo
+
+	if err = checkPreconditions(srcObjInfo, conditional, h.cfg.MD5Enabled()); err != nil {
+		h.logAndSendError(w, "precondition failed", reqInfo, err)
+		return
+	}
+
+	srcSize, err := layer.GetObjectSize(srcObjInfo)
+	if err != nil {
+		h.logAndSendError(w, "failed to get source object size", reqInfo, err)
+		return
+	}
+
+	byteRange, err := parsePatchByteRange(r.Header.Get(api.ContentRange), srcSize)
+	if err != nil {
+		h.logAndSendError(w, "could not parse byte range", reqInfo, errors.GetAPIError(errors.ErrInvalidRange), zap.Error(err))
+		return
+	}
+
+	if maxPatchSize < byteRange.End-byteRange.Start+1 {
+		h.logAndSendError(w, "byte range length is longer than allowed", reqInfo, errors.GetAPIError(errors.ErrInvalidRange), zap.Error(err))
+		return
+	}
+
+	if uint64(r.ContentLength) != (byteRange.End - byteRange.Start + 1) {
+		h.logAndSendError(w, "content-length must be equal to byte range length", reqInfo, errors.GetAPIError(errors.ErrInvalidRangeLength))
+		return
+	}
+
+	if byteRange.Start > srcSize {
+		h.logAndSendError(w, "start byte is greater than object size", reqInfo, errors.GetAPIError(errors.ErrRangeOutOfBounds))
+		return
+	}
+
+	params := &layer.PatchObjectParams{
+		Object:            srcObjInfo,
+		BktInfo:           bktInfo,
+		NewBytes:          r.Body,
+		Range:             byteRange,
+		VersioningEnabled: settings.VersioningEnabled(),
+	}
+
+	extendedObjInfo, err := h.obj.PatchObject(ctx, params)
+	if err != nil {
+		if isErrObjectLocked(err) {
+			h.logAndSendError(w, "object is locked", reqInfo, errors.GetAPIError(errors.ErrAccessDenied))
+		} else {
+			h.logAndSendError(w, "could not patch object", reqInfo, err)
+		}
+		return
+	}
+
+	w.Header().Set(api.AmzVersionID, extendedObjInfo.ObjectInfo.VersionID())
+	w.Header().Set(api.ETag, data.Quote(extendedObjInfo.ObjectInfo.ETag(h.cfg.MD5Enabled())))
+
+	resp := PatchObjectResult{
+		Object: PatchObject{
+			LastModified: extendedObjInfo.ObjectInfo.Created.UTC().Format(time.RFC3339),
+			ETag:         data.Quote(extendedObjInfo.ObjectInfo.ETag(h.cfg.MD5Enabled())),
+		},
+	}
+
+	if err = middleware.EncodeToResponse(w, resp); err != nil {
+		h.logAndSendError(w, "could not encode PatchObjectResult to response", reqInfo, err)
+		return
+	}
+}
+
+func parsePatchConditionalHeaders(headers http.Header) (*conditionalArgs, error) {
+	var err error
+	args := &conditionalArgs{
+		IfMatch: data.UnQuote(headers.Get(api.IfMatch)),
+	}
+
+	if args.IfUnmodifiedSince, err = parseHTTPTime(headers.Get(api.IfUnmodifiedSince)); err != nil {
+		return nil, err
+	}
+
+	return args, nil
+}
+
+func parsePatchByteRange(rangeStr string, objSize uint64) (*layer.RangeParams, error) {
+	const prefix = "bytes "
+
+	if rangeStr == "" {
+		return nil, fmt.Errorf("empty range")
+	}
+
+	if !strings.HasPrefix(rangeStr, prefix) {
+		return nil, fmt.Errorf("unknown unit in range header")
+	}
+
+	rangeStr, _, found := strings.Cut(strings.TrimPrefix(rangeStr, prefix), "/") // value after / is ignored
+	if !found {
+		return nil, fmt.Errorf("invalid range: %s", rangeStr)
+	}
+
+	startStr, endStr, found := strings.Cut(rangeStr, "-")
+	if !found {
+		return nil, fmt.Errorf("invalid range: %s", rangeStr)
+	}
+
+	start, err := strconv.ParseUint(startStr, 10, 64)
+	if err != nil {
+		return nil, fmt.Errorf("invalid start byte: %s", startStr)
+	}
+
+	end := objSize - 1
+	if len(endStr) > 0 {
+		end, err = strconv.ParseUint(endStr, 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("invalid end byte: %s", endStr)
+		}
+	}
+
+	if start > end {
+		return nil, fmt.Errorf("start byte is greater than end byte")
+	}
+
+	return &layer.RangeParams{
+		Start: start,
+		End:   end,
+	}, nil
+}

api/handler/patch_test.go

@@ -0,0 +1,292 @@
+package handler
+
+import (
+	"bytes"
+	"crypto/md5"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/xml"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"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/layer"
+	"github.com/stretchr/testify/require"
+)
+
+func TestPatch(t *testing.T) {
+	tc := prepareHandlerContext(t)
+	tc.config.md5Enabled = true
+
+	bktName, objName := "bucket-for-patch", "object-for-patch"
+	createTestBucket(tc, bktName)
+
+	content := []byte("old object content")
+	md5Hash := md5.New()
+	md5Hash.Write(content)
+	etag := data.Quote(hex.EncodeToString(md5Hash.Sum(nil)))
+
+	w, r := prepareTestPayloadRequest(tc, bktName, objName, bytes.NewReader(content))
+	created := time.Now()
+	tc.Handler().PutObjectHandler(w, r)
+	require.Equal(t, etag, w.Header().Get(api.ETag))
+
+	patchPayload := []byte("new")
+	sha256Hash := sha256.New()
+	sha256Hash.Write(patchPayload)
+	sha256Hash.Write(content[len(patchPayload):])
+	hash := hex.EncodeToString(sha256Hash.Sum(nil))
+
+	for _, tt := range []struct {
+		name    string
+		rng     string
+		headers map[string]string
+		code    s3errors.ErrorCode
+	}{
+		{
+			name: "success",
+			rng:  "bytes 0-2/*",
+			headers: map[string]string{
+				api.IfUnmodifiedSince: created.Format(http.TimeFormat),
+				api.IfMatch:           etag,
+			},
+		},
+		{
+			name: "invalid range syntax",
+			rng:  "bytes 0-2",
+			code: s3errors.ErrInvalidRange,
+		},
+		{
+			name: "invalid range length",
+			rng:  "bytes 0-5/*",
+			code: s3errors.ErrInvalidRangeLength,
+		},
+		{
+			name: "invalid range start",
+			rng:  "bytes 20-22/*",
+			code: s3errors.ErrRangeOutOfBounds,
+		},
+		{
+			name: "range is too long",
+			rng:  "bytes 0-5368709120/*",
+			code: s3errors.ErrInvalidRange,
+		},
+		{
+			name: "If-Unmodified-Since precondition are not satisfied",
+			rng:  "bytes 0-2/*",
+			headers: map[string]string{
+				api.IfUnmodifiedSince: created.Add(-24 * time.Hour).Format(http.TimeFormat),
+			},
+			code: s3errors.ErrPreconditionFailed,
+		},
+		{
+			name: "If-Match precondition are not satisfied",
+			rng:  "bytes 0-2/*",
+			headers: map[string]string{
+				api.IfMatch: "etag",
+			},
+			code: s3errors.ErrPreconditionFailed,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.code == 0 {
+				res := patchObject(t, tc, bktName, objName, tt.rng, patchPayload, tt.headers)
+				require.Equal(t, data.Quote(hash), res.Object.ETag)
+			} else {
+				patchObjectErr(t, tc, bktName, objName, tt.rng, patchPayload, tt.headers, tt.code)
+			}
+		})
+	}
+}
+
+func TestPatchWithVersion(t *testing.T) {
+	hc := prepareHandlerContextWithMinCache(t)
+	bktName, objName := "bucket", "obj"
+	createVersionedBucket(hc, bktName)
+	objHeader := putObjectContent(hc, bktName, objName, "content")
+
+	putObjectContent(hc, bktName, objName, "some content")
+
+	patchObjectVersion(t, hc, bktName, objName, objHeader.Get(api.AmzVersionID), "bytes 7-14/*", []byte(" updated"))
+
+	res := listObjectsVersions(hc, bktName, "", "", "", "", 3)
+	require.False(t, res.IsTruncated)
+	require.Len(t, res.Version, 3)
+
+	for _, version := range res.Version {
+		content := getObjectVersion(hc, bktName, objName, version.VersionID)
+		if version.IsLatest {
+			require.Equal(t, []byte("content updated"), content)
+			continue
+		}
+		if version.VersionID == objHeader.Get(api.AmzVersionID) {
+			require.Equal(t, []byte("content"), content)
+			continue
+		}
+		require.Equal(t, []byte("some content"), content)
+	}
+}
+
+func TestPatchEncryptedObject(t *testing.T) {
+	tc := prepareHandlerContext(t)
+	bktName, objName := "bucket-for-patch-encrypted", "object-for-patch-encrypted"
+	createTestBucket(tc, bktName)
+
+	w, r := prepareTestPayloadRequest(tc, bktName, objName, strings.NewReader("object content"))
+	setEncryptHeaders(r)
+	tc.Handler().PutObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	patchObjectErr(t, tc, bktName, objName, "bytes 2-4/*", []byte("new"), nil, s3errors.ErrInternalError)
+}
+
+func TestPatchMissingHeaders(t *testing.T) {
+	tc := prepareHandlerContext(t)
+	bktName, objName := "bucket-for-patch-missing-headers", "object-for-patch-missing-headers"
+	createTestBucket(tc, bktName)
+
+	w, r := prepareTestPayloadRequest(tc, bktName, objName, strings.NewReader("object content"))
+	setEncryptHeaders(r)
+	tc.Handler().PutObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	w = httptest.NewRecorder()
+	r = httptest.NewRequest(http.MethodPatch, defaultURL, strings.NewReader("new"))
+	tc.Handler().PatchObjectHandler(w, r)
+	assertS3Error(t, w, s3errors.GetAPIError(s3errors.ErrMissingContentRange))
+
+	w = httptest.NewRecorder()
+	r = httptest.NewRequest(http.MethodPatch, defaultURL, strings.NewReader("new"))
+	r.Header.Set(api.ContentRange, "bytes 0-2/*")
+	tc.Handler().PatchObjectHandler(w, r)
+	assertS3Error(t, w, s3errors.GetAPIError(s3errors.ErrMissingContentLength))
+}
+
+func TestParsePatchByteRange(t *testing.T) {
+	for _, tt := range []struct {
+		rng      string
+		size     uint64
+		expected *layer.RangeParams
+		err      bool
+	}{
+		{
+			rng: "bytes 2-7/*",
+			expected: &layer.RangeParams{
+				Start: 2,
+				End:   7,
+			},
+		},
+		{
+			rng: "bytes 2-7/3",
+			expected: &layer.RangeParams{
+				Start: 2,
+				End:   7,
+			},
+		},
+		{
+			rng:  "bytes 2-/*",
+			size: 9,
+			expected: &layer.RangeParams{
+				Start: 2,
+				End:   8,
+			},
+		},
+		{
+			rng:  "bytes 2-/3",
+			size: 9,
+			expected: &layer.RangeParams{
+				Start: 2,
+				End:   8,
+			},
+		},
+		{
+			rng: "",
+			err: true,
+		},
+		{
+			rng: "2-7/*",
+			err: true,
+		},
+		{
+			rng: "bytes 7-2/*",
+			err: true,
+		},
+		{
+			rng: "bytes 2-7",
+			err: true,
+		},
+		{
+			rng: "bytes 2/*",
+			err: true,
+		},
+		{
+			rng: "bytes a-7/*",
+			err: true,
+		},
+		{
+			rng: "bytes 2-a/*",
+			err: true,
+		},
+	} {
+		t.Run(fmt.Sprintf("case: %s", tt.rng), func(t *testing.T) {
+			rng, err := parsePatchByteRange(tt.rng, tt.size)
+			if tt.err {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.expected.Start, rng.Start)
+				require.Equal(t, tt.expected.End, rng.End)
+			}
+		})
+	}
+}
+
+func patchObject(t *testing.T, tc *handlerContext, bktName, objName, rng string, payload []byte, headers map[string]string) *PatchObjectResult {
+	w := patchObjectBase(tc, bktName, objName, "", rng, payload, headers)
+	assertStatus(t, w, http.StatusOK)
+
+	result := &PatchObjectResult{}
+	err := xml.NewDecoder(w.Result().Body).Decode(result)
+	require.NoError(t, err)
+	return result
+}
+
+func patchObjectVersion(t *testing.T, tc *handlerContext, bktName, objName, version, rng string, payload []byte) *PatchObjectResult {
+	w := patchObjectBase(tc, bktName, objName, version, rng, payload, nil)
+	assertStatus(t, w, http.StatusOK)
+
+	result := &PatchObjectResult{}
+	err := xml.NewDecoder(w.Result().Body).Decode(result)
+	require.NoError(t, err)
+	return result
+}
+
+func patchObjectErr(t *testing.T, tc *handlerContext, bktName, objName, rng string, payload []byte, headers map[string]string, code s3errors.ErrorCode) {
+	w := patchObjectBase(tc, bktName, objName, "", rng, payload, headers)
+	assertS3Error(t, w, s3errors.GetAPIError(code))
+}
+
+func patchObjectBase(tc *handlerContext, bktName, objName, version, rng string, payload []byte, headers map[string]string) *httptest.ResponseRecorder {
+	query := make(url.Values)
+	if len(version) > 0 {
+		query.Add(api.QueryVersionID, version)
+	}
+
+	w, r := prepareTestRequestWithQuery(tc, bktName, objName, query, payload)
+	r.Header.Set(api.ContentRange, rng)
+	r.Header.Set(api.ContentLength, strconv.Itoa(len(payload)))
+	for k, v := range headers {
+		r.Header.Set(k, v)
+	}
+
+	tc.Handler().PatchObjectHandler(w, r)
+	return w
+}

api/handler/response.go

@@ -195,6 +195,15 @@ type PostResponse struct {
 	ETag   string `xml:"Etag"`
 }
 
+type PatchObjectResult struct {
+	Object PatchObject `xml:"Object"`
+}
+
+type PatchObject struct {
+	LastModified string `xml:"LastModified"`
+	ETag         string `xml:"ETag"`
+}
+
 // MarshalXML -- StringMap marshals into XML.
 func (s StringMap) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
 	tokens := []xml.Token{start}

api/layer/frostfs.go

@@ -194,6 +194,27 @@ type PrmObjectSearch struct {
 	FilePrefix string
 }
 
+// PrmObjectPatch groups parameters of FrostFS.PatchObject operation.
+type PrmObjectPatch struct {
+	// Authentication parameters.
+	PrmAuth
+
+	// Container of the patched object.
+	Container cid.ID
+
+	// Identifier of the patched object.
+	Object oid.ID
+
+	// Object patch payload encapsulated in io.Reader primitive.
+	Payload io.Reader
+
+	// Object range to patch.
+	Range *RangeParams
+
+	// Size of original object payload.
+	ObjectSize uint64
+}
+
 var (
 	// ErrAccessDenied is returned from FrostFS in case of access violation.
 	ErrAccessDenied = errors.New("access denied")
@@ -288,6 +309,15 @@ type FrostFS interface {
 	// prevented the objects from being selected.
 	SearchObjects(context.Context, PrmObjectSearch) ([]oid.ID, error)
 
+	// PatchObject performs object patch in the FrostFS container.
+	// It returns the ID of the patched object.
+	//
+	// It returns ErrAccessDenied on selection access violation.
+	//
+	// It returns exactly one non-nil value. It returns any error encountered which
+	// prevented the objects from being patched.
+	PatchObject(context.Context, PrmObjectPatch) (oid.ID, error)
+
 	// TimeToEpoch computes current epoch and the epoch that corresponds to the provided now and future time.
 	// Note:
 	// * future time must be after the now

api/layer/frostfs_mock.go

@@ -20,6 +20,7 @@ import (
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"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"
@@ -404,6 +405,42 @@ func (t *TestFrostFS) SearchObjects(_ context.Context, prm PrmObjectSearch) ([]o
 	return res, nil
 }
 
+func (t *TestFrostFS) PatchObject(ctx context.Context, prm PrmObjectPatch) (oid.ID, error) {
+	obj, err := t.retrieveObject(ctx, prm.Container, prm.Object)
+	if err != nil {
+		return oid.ID{}, err
+	}
+
+	newObj := *obj
+
+	patchBytes, err := io.ReadAll(prm.Payload)
+	if err != nil {
+		return oid.ID{}, err
+	}
+
+	var newPayload []byte
+	if prm.Range.Start > 0 {
+		newPayload = append(newPayload, obj.Payload()[:prm.Range.Start]...)
+	}
+	newPayload = append(newPayload, patchBytes...)
+	if prm.Range.End < obj.PayloadSize()-1 {
+		newPayload = append(newPayload, obj.Payload()[prm.Range.End+1:]...)
+	}
+	newObj.SetPayload(newPayload)
+	newObj.SetPayloadSize(uint64(len(newPayload)))
+
+	var hash checksum.Checksum
+	checksum.Calculate(&hash, checksum.SHA256, newPayload)
+	newObj.SetPayloadChecksum(hash)
+
+	newID := oidtest.ID()
+	newObj.SetID(newID)
+
+	t.objects[newAddress(prm.Container, newID).EncodeToString()] = &newObj
+
+	return newID, nil
+}
+
 func (t *TestFrostFS) checkAccess(cnrID cid.ID, owner user.ID) bool {
 	cnr, ok := t.containers[cnrID.EncodeToString()]
 	if !ok {

api/layer/layer.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/ecdsa"
 	"crypto/rand"
+	"encoding/hex"
 	"encoding/json"
 	"encoding/xml"
 	stderrors "errors"
@@ -157,6 +158,15 @@ type (
 		DstEncryption encryption.Params
 		CopiesNumbers []uint32
 	}
+
+	PatchObjectParams struct {
+		Object            *data.ObjectInfo
+		BktInfo           *data.BucketInfo
+		NewBytes          io.Reader
+		Range             *RangeParams
+		VersioningEnabled bool
+	}
+
 	// CreateBucketParams stores bucket create request parameters.
 	CreateBucketParams struct {
 		Name                     string
@@ -531,6 +541,66 @@ func (n *Layer) CopyObject(ctx context.Context, p *CopyObjectParams) (*data.Exte
 	})
 }
 
+func (n *Layer) PatchObject(ctx context.Context, p *PatchObjectParams) (*data.ExtendedObjectInfo, error) {
+	if p.Object.Headers[AttributeDecryptedSize] != "" {
+		return nil, fmt.Errorf("patch encrypted object")
+	}
+
+	if p.Object.Headers[MultipartObjectSize] != "" {
+		// TODO: support multipart object patch
+		return nil, fmt.Errorf("patch multipart object")
+	}
+
+	prmPatch := PrmObjectPatch{
+		Container:  p.BktInfo.CID,
+		Object:     p.Object.ID,
+		Payload:    p.NewBytes,
+		Range:      p.Range,
+		ObjectSize: p.Object.Size,
+	}
+	n.prepareAuthParameters(ctx, &prmPatch.PrmAuth, p.BktInfo.Owner)
+
+	objID, err := n.frostFS.PatchObject(ctx, prmPatch)
+	if err != nil {
+		return nil, fmt.Errorf("patch object: %w", err)
+	}
+
+	obj, err := n.objectHead(ctx, p.BktInfo, objID)
+	if err != nil {
+		return nil, fmt.Errorf("head object: %w", err)
+	}
+
+	payloadChecksum, _ := obj.PayloadChecksum()
+	hashSum := hex.EncodeToString(payloadChecksum.Value())
+	newVersion := &data.NodeVersion{
+		BaseNodeVersion: data.BaseNodeVersion{
+			OID:      objID,
+			ETag:     hashSum,
+			FilePath: p.Object.Name,
+			Size:     obj.PayloadSize(),
+			Created:  &p.Object.Created,
+			Owner:    &n.gateOwner,
+			// TODO: Add creation epoch
+		},
+		IsUnversioned: !p.VersioningEnabled,
+		IsCombined:    p.Object.Headers[MultipartObjectSize] != "",
+	}
+
+	if newVersion.ID, err = n.treeService.AddVersion(ctx, p.BktInfo, newVersion); err != nil {
+		return nil, fmt.Errorf("couldn't add new verion to tree service: %w", err)
+	}
+
+	p.Object.ID = objID
+	p.Object.Size = obj.PayloadSize()
+	p.Object.MD5Sum = ""
+	p.Object.HashSum = hashSum
+
+	return &data.ExtendedObjectInfo{
+		ObjectInfo:  p.Object,
+		NodeVersion: newVersion,
+	}, nil
+}
+
 func getRandomOID() (oid.ID, error) {
 	b := [32]byte{}
 	if _, err := rand.Read(b[:]); err != nil {

api/middleware/constants.go

@@ -74,6 +74,7 @@ const (
 	AbortMultipartUploadOperation    = "AbortMultipartUpload"
 	DeleteObjectTaggingOperation     = "DeleteObjectTagging"
 	DeleteObjectOperation            = "DeleteObject"
+	PatchObjectOperation             = "PatchObject"
 )
 
 const (

api/middleware/policy.go

@@ -357,6 +357,8 @@ func determineObjectOperation(r *http.Request) string {
 	switch r.Method {
 	case http.MethodOptions:
 		return OptionsObjectOperation
+	case http.MethodPatch:
+		return PatchObjectOperation
 	case http.MethodHead:
 		return HeadObjectOperation
 	case http.MethodGet:

api/router.go

@@ -87,6 +87,7 @@ type (
 		AbortMultipartUploadHandler(http.ResponseWriter, *http.Request)
 		ListPartsHandler(w http.ResponseWriter, r *http.Request)
 		ListMultipartUploadsHandler(http.ResponseWriter, *http.Request)
+		PatchObjectHandler(http.ResponseWriter, *http.Request)
 
 		ResolveBucket(ctx context.Context, bucket string) (*data.BucketInfo, error)
 		ResolveCID(ctx context.Context, bucket string) (cid.ID, error)
@@ -376,6 +377,8 @@ func objectRouter(h Handler, l *zap.Logger) chi.Router {
 
 	objRouter.Head("/*", named(s3middleware.HeadObjectOperation, h.HeadObjectHandler))
 
+	objRouter.Patch("/*", named(s3middleware.PatchObjectOperation, h.PatchObjectHandler))
+
 	// GET method handlers
 	objRouter.Group(func(r chi.Router) {
 		r.Method(http.MethodGet, "/*", NewHandlerFilter().

api/router_mock_test.go

@@ -534,6 +534,10 @@ func (h *handlerMock) ListMultipartUploadsHandler(w http.ResponseWriter, r *http
 	h.writeResponse(w, res)
 }
 
+func (h *handlerMock) PatchObjectHandler(http.ResponseWriter, *http.Request) {
+	panic("implement me")
+}
+
 func (h *handlerMock) ResolveBucket(ctx context.Context, name string) (*data.BucketInfo, error) {
 	reqInfo := middleware.GetReqInfo(ctx)
 	bktInfo, ok := h.buckets[reqInfo.Namespace+name]

go.mod

@@ -3,10 +3,10 @@ module git.frostfs.info/TrueCloudLab/frostfs-s3-gw
 go 1.21
 
 require (
-	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240716113920-f517e3949164
+	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240809081817-47a48969b067
 	git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.3-0.20240621131249-49e5270f673e
 	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6
-	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240722121227-fa89999d919c
+	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240813155821-98aabc45a720
 	git.frostfs.info/TrueCloudLab/policy-engine v0.0.0-20240611102930-ac965e8d176a
 	git.frostfs.info/TrueCloudLab/zapjournald v0.0.0-20240124114243-cb2e66427d02
 	github.com/aws/aws-sdk-go v1.44.6
@@ -32,7 +32,7 @@ require (
 	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225
 	golang.org/x/net v0.23.0
 	golang.org/x/text v0.14.0
-	google.golang.org/grpc v1.62.0
+	google.golang.org/grpc v1.63.2
 	google.golang.org/protobuf v1.33.0
 )
 
@@ -52,7 +52,6 @@ require (
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.1 // indirect
 	github.com/gorilla/websocket v1.5.1 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.11.3 // indirect
@@ -92,9 +91,9 @@ require (
 	golang.org/x/sync v0.6.0 // indirect
 	golang.org/x/sys v0.18.0 // indirect
 	golang.org/x/term v0.18.0 // indirect
-	google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20240205150955-31a09d347014 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240221002015-b0ce06bbee7c // indirect
+	google.golang.org/genproto v0.0.0-20240227224415-6ceb2ff114de // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240227224415-6ceb2ff114de // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // 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 v2.16.1-0.20240716113920-f517e3949164 h1:XxvwQKJT/f16qS3df5PBQPRYKkhy0/A7zH6644QpKD0=
-git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240716113920-f517e3949164/go.mod h1:OBDSr+DqV1z4VDouoX3YMleNc4DPBVBWTG3WDT2PK1o=
+git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240809081817-47a48969b067 h1:/da6lloTPujJgEYF/dgqbxY9h6TMaRHclOV9yvCcE8s=
+git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240809081817-47a48969b067/go.mod h1:mc7j6Cc1GU1tJZNmDwEYiJJ339biNnU1Bz3wZGogMe0=
 git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.3-0.20240621131249-49e5270f673e h1:kcBqZBiFIUBATUqEuvVigtkJJWQ2Gug/eYXn967o3M4=
 git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.3-0.20240621131249-49e5270f673e/go.mod h1:F/fe1OoIDKr5Bz99q4sriuHDuf3aZefZy9ZsCqEtgxc=
 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 v0.0.0-20240722121227-fa89999d919c h1:8ZS6eUFnOhzUo9stFqwq1Zyq+Y5YNcYAidCGICcZVL4=
-git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240722121227-fa89999d919c/go.mod h1:vluJ/+yQMcq8ZIZZSA7Te+JKClr0lgtRErjICvb8wto=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240813155821-98aabc45a720 h1:15UXpW42bfshIv/X5kww92jG2o0drHgsdFd+UJ6zD7g=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240813155821-98aabc45a720/go.mod h1:XRX/bBQsDJKr040N/a0YnDhxJqaUv1XyMVj3qxnb5K0=
 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/policy-engine v0.0.0-20240611102930-ac965e8d176a h1:Bk1fB4cQASPKgAVGCdlBOEp5ohZfDxqK6fZM8eP+Emo=
@@ -160,8 +160,6 @@ github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
-github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
-github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
@@ -654,12 +652,12 @@ google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20210108203827-ffc7fda8c3d7/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210226172003-ab064af71705/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20211118181313-81c1377c94b1/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9 h1:9+tzLLstTlPTRyJTh+ah5wIMsBW5c4tQwGTN3thOW9Y=
-google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9/go.mod h1:mqHbVIp48Muh7Ywss/AD6I5kNVKZMmAa/QEW58Gxp2s=
-google.golang.org/genproto/googleapis/api v0.0.0-20240205150955-31a09d347014 h1:x9PwdEgd11LgK+orcck69WVRo7DezSO4VUMPI4xpc8A=
-google.golang.org/genproto/googleapis/api v0.0.0-20240205150955-31a09d347014/go.mod h1:rbHMSEDyoYX62nRVLOCc4Qt1HbsdytAYoVwgjiOhF3I=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240221002015-b0ce06bbee7c h1:NUsgEN92SQQqzfA+YtqYNqYmB3DMMYLlIwUZAQFVFbo=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240221002015-b0ce06bbee7c/go.mod h1:H4O17MA/PE9BsGx3w+a+W2VOLLD1Qf7oJneAoU6WktY=
+google.golang.org/genproto v0.0.0-20240227224415-6ceb2ff114de h1:F6qOa9AZTYJXOUEr4jDysRDLrm4PHePlge4v4TGAlxY=
+google.golang.org/genproto v0.0.0-20240227224415-6ceb2ff114de/go.mod h1:VUhTRKeHn9wwcdrk73nvdC9gF178Tzhmt/qyaFcPLSo=
+google.golang.org/genproto/googleapis/api v0.0.0-20240227224415-6ceb2ff114de h1:jFNzHPIeuzhdRwVhbZdiym9q0ory/xY3sA+v2wPg8I0=
+google.golang.org/genproto/googleapis/api v0.0.0-20240227224415-6ceb2ff114de/go.mod h1:5iCWqnniDlqZHrd3neWVTOwvh/v6s3232omMecelax8=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de h1:cZGRis4/ot9uVm639a+rHCUaG0JJHEsdyzSQTMX+suY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de/go.mod h1:H4O17MA/PE9BsGx3w+a+W2VOLLD1Qf7oJneAoU6WktY=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
@@ -680,8 +678,8 @@ google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAG
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
 google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
-google.golang.org/grpc v1.62.0 h1:HQKZ/fa1bXkX1oFOvSjmZEUL8wLSaZTjCcLAlmZRtdk=
-google.golang.org/grpc v1.62.0/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
+google.golang.org/grpc v1.63.2 h1:MUeiw1B2maTVZthpU5xvASfTh3LDbxHd6IJ6QQVU+xM=
+google.golang.org/grpc v1.63.2/go.mod h1:WAX/8DgncnokcFUldAxq7GeB5DXHDbMF+lLvDomNkRA=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=

internal/frostfs/frostfs.go

@@ -389,6 +389,38 @@ func (x *FrostFS) SearchObjects(ctx context.Context, prm layer.PrmObjectSearch)
 	return buf, handleObjectError("read object list", err)
 }
 
+func (x *FrostFS) PatchObject(ctx context.Context, prm layer.PrmObjectPatch) (oid.ID, error) {
+	var addr oid.Address
+	addr.SetContainer(prm.Container)
+	addr.SetObject(prm.Object)
+
+	var prmPatch pool.PrmObjectPatch
+	prmPatch.SetAddress(addr)
+
+	var rng object.Range
+	rng.SetOffset(prm.Range.Start)
+	rng.SetLength(prm.Range.End - prm.Range.Start + 1)
+	if prm.Range.End >= prm.ObjectSize {
+		rng.SetLength(prm.ObjectSize - prm.Range.Start)
+	}
+
+	prmPatch.SetRange(&rng)
+	prmPatch.SetPayloadReader(prm.Payload)
+
+	if prm.BearerToken != nil {
+		prmPatch.UseBearer(*prm.BearerToken)
+	} else {
+		prmPatch.UseKey(prm.PrivateKey)
+	}
+
+	res, err := x.pool.PatchObject(ctx, prmPatch)
+	if err != nil {
+		return oid.ID{}, handleObjectError("patch object via connection pool", err)
+	}
+
+	return res.ObjectID, nil
+}
+
 // ResolverFrostFS represents virtual connection to the FrostFS network.
 // It implements resolver.FrostFS.
 type ResolverFrostFS struct {