[#2028] node: Do not wrap malformed request errors

After presenting request statuses on the API level, all the errors are
unwrapped before sending to the caller side. It led to a losing invalid
request's context.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

CHANGELOG.md

@@ -21,7 +21,8 @@ Changelog for NeoFS Node
 - `neofs-cli lock object`'s `lifetime` flag handling (#1972)
 - Do not move write-cache in read-only mode for flushing (#1906)
 - Child object collection on CLI side with a bearer token (#2000)
-- Fix concurrent map writes in `Object.Put` service
+- Fix concurrent map writes in `Object.Put` service (#2037)
+- Malformed request errors' reasons in the responses (#2028)
 
 ### Removed
 ### Updated

pkg/services/object/acl/v2/errors.go

@@ -1,18 +1,24 @@
 package v2
 
 import (
-	"errors"
 	"fmt"
 
 	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
 )
 
+const invalidRequestMessage = "malformed request"
+
+func malformedRequestError(reason string) error {
+	return fmt.Errorf("%s: %s", invalidRequestMessage, reason)
+}
+
 var (
-	// ErrMalformedRequest is returned when request contains
-	// invalid data.
-	ErrMalformedRequest = errors.New("malformed request")
-	// ErrInvalidVerb is returned when session token verb doesn't include necessary operation.
-	ErrInvalidVerb = errors.New("session token verb is invalid")
+	errEmptyBody               = malformedRequestError("empty body")
+	errEmptyVerificationHeader = malformedRequestError("empty verification header")
+	errEmptyBodySig            = malformedRequestError("empty at body signature")
+	errInvalidSessionSig       = malformedRequestError("invalid session token signature")
+	errInvalidSessionOwner     = malformedRequestError("invalid session token owner")
+	errInvalidVerb             = malformedRequestError("session token verb is invalid")
 )
 
 const accessDeniedACLReasonFmt = "access to operation %s is denied by basic ACL check"

pkg/services/object/acl/v2/request.go

@@ -110,7 +110,7 @@ type MetaWithToken struct {
 // according to internal meta information.
 func (r MetaWithToken) RequestOwner() (*user.ID, *keys.PublicKey, error) {
 	if r.vheader == nil {
-		return nil, nil, fmt.Errorf("%w: nil verification header", ErrMalformedRequest)
+		return nil, nil, errEmptyVerificationHeader
 	}
 
 	// if session token is presented, use it as truth source
@@ -122,7 +122,7 @@ func (r MetaWithToken) RequestOwner() (*user.ID, *keys.PublicKey, error) {
 	// otherwise get original body signature
 	bodySignature := originalBodySignature(r.vheader)
 	if bodySignature == nil {
-		return nil, nil, fmt.Errorf("%w: nil at body signature", ErrMalformedRequest)
+		return nil, nil, errEmptyBodySig
 	}
 
 	key, err := unmarshalPublicKey(bodySignature.GetKey())

pkg/services/object/acl/v2/service.go

@@ -445,7 +445,7 @@ func (b Service) GetRangeHash(
 func (p putStreamBasicChecker) Send(request *objectV2.PutRequest) error {
 	body := request.GetBody()
 	if body == nil {
-		return ErrMalformedRequest
+		return errEmptyBody
 	}
 
 	part := body.GetObjectPart()
@@ -574,12 +574,12 @@ func (b Service) findRequestInfo(req MetaWithToken, idCnr cid.ID, op acl.Op) (in
 			return info, errors.New("can't fetch current epoch")
 		}
 		if req.token.ExpiredAt(currentEpoch) {
-			return info, fmt.Errorf("%w: token has expired (current epoch: %d)",
-				ErrMalformedRequest, currentEpoch)
+			return info, fmt.Errorf("%s: token has expired (current epoch: %d)",
+				invalidRequestMessage, currentEpoch)
 		}
 
 		if !assertVerb(*req.token, op) {
-			return info, ErrInvalidVerb
+			return info, errInvalidVerb
 		}
 	}
 

pkg/services/object/acl/v2/util.go

@@ -114,7 +114,7 @@ func getObjectIDFromRequestBody(body interface{ GetAddress() *refsV2.Address })
 func ownerFromToken(token *sessionSDK.Object) (*user.ID, *keys.PublicKey, error) {
 	// 1. First check signature of session token.
 	if !token.VerifySignature() {
-		return nil, nil, fmt.Errorf("%w: invalid session token signature", ErrMalformedRequest)
+		return nil, nil, errInvalidSessionSig
 	}
 
 	// 2. Then check if session token owner issued the session token
@@ -131,7 +131,7 @@ func ownerFromToken(token *sessionSDK.Object) (*user.ID, *keys.PublicKey, error)
 
 	if !isOwnerFromKey(tokenIssuer, tokenIssuerKey) {
 		// TODO: #767 in this case we can issue all owner keys from neofs.id and check once again
-		return nil, nil, fmt.Errorf("%w: invalid session token owner", ErrMalformedRequest)
+		return nil, nil, errInvalidSessionOwner
 	}
 
 	return &tokenIssuer, tokenIssuerKey, nil