implement `GetObjectAclHandler`

weed/s3api/s3api_acp.go

@@ -1,9 +1,14 @@
 package s3api
 
 import (
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3account"
+	"github.com/seaweedfs/seaweedfs/weed/s3api/s3acl"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
+	"github.com/seaweedfs/seaweedfs/weed/util"
 	"net/http"
 )
 
@@ -27,3 +32,74 @@ func (s3a *S3ApiServer) checkAccessByOwnership(r *http.Request, bucket string) s
 	}
 	return s3err.ErrAccessDenied
 }
+
+//Check ObjectAcl-Read related access
+// includes:
+// - GetObjectAclHandler
+func (s3a *S3ApiServer) checkAccessForReadObjectAcl(r *http.Request, bucket, object string) (acp *s3.AccessControlPolicy, errCode s3err.ErrorCode) {
+	bucketMetadata, errCode := s3a.bucketRegistry.GetBucketMetadata(bucket)
+	if errCode != s3err.ErrNone {
+		return nil, errCode
+	}
+
+	getAcpFunc := func() (*s3.AccessControlPolicy, s3err.ErrorCode) {
+		entry, err := getObjectEntry(s3a, bucket, object)
+		if err != nil {
+			if err == filer_pb.ErrNotFound {
+				return nil, s3err.ErrNoSuchKey
+			} else {
+				return nil, s3err.ErrInternalError
+			}
+		}
+
+		if entry.IsDirectory {
+			return nil, s3err.ErrExistingObjectIsDirectory
+		}
+
+		acpOwnerId := s3acl.GetAcpOwner(entry.Extended, *bucketMetadata.Owner.ID)
+		acpOwnerName := s3a.accountManager.IdNameMapping[acpOwnerId]
+		acpGrants := s3acl.GetAcpGrants(entry.Extended)
+		acp = &s3.AccessControlPolicy{
+			Owner: &s3.Owner{
+				ID:          &acpOwnerId,
+				DisplayName: &acpOwnerName,
+			},
+			Grants: acpGrants,
+		}
+		return acp, s3err.ErrNone
+	}
+
+	if bucketMetadata.ObjectOwnership == s3_constants.OwnershipBucketOwnerEnforced {
+		return getAcpFunc()
+	} else {
+		accountId := s3acl.GetAccountId(r)
+
+		acp, errCode := getAcpFunc()
+		if errCode != s3err.ErrNone {
+			return nil, errCode
+		}
+
+		if accountId == *acp.Owner.ID {
+			return acp, s3err.ErrNone
+		}
+
+		//find in Grants
+		if acp.Grants != nil {
+			reqGrants := s3acl.DetermineReqGrants(accountId, s3_constants.PermissionReadAcp)
+			for _, requiredGrant := range reqGrants {
+				for _, grant := range acp.Grants {
+					if s3acl.GrantEquals(requiredGrant, grant) {
+						return acp, s3err.ErrNone
+					}
+				}
+			}
+		}
+
+		glog.V(3).Infof("acl denied! request account id: %s", accountId)
+		return nil, s3err.ErrAccessDenied
+	}
+}
+
+func getObjectEntry(s3a *S3ApiServer, bucket, object string) (*filer_pb.Entry, error) {
+	return s3a.getEntry(util.Join(s3a.option.BucketsPath, bucket), object)
+}

weed/s3api/s3api_object_handlers.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
+	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
 	"github.com/seaweedfs/seaweedfs/weed/security"
 	"github.com/seaweedfs/seaweedfs/weed/util/mem"
@@ -174,6 +175,21 @@ func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request)
 	s3a.proxyToFiler(w, r, destUrl, false, passThroughResponse)
 }
 
+// GetObjectAclHandler Put object ACL
+// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjecthtml
+func (s3a *S3ApiServer) GetObjectAclHandler(w http.ResponseWriter, r *http.Request) {
+	bucket, object := s3_constants.GetBucketAndObject(r)
+	acp, errCode := s3a.checkAccessForReadObjectAcl(r, bucket, object)
+	if errCode != s3err.ErrNone {
+		s3err.WriteErrorResponse(w, r, errCode)
+		return
+	}
+	result := &s3.PutBucketAclInput{
+		AccessControlPolicy: acp,
+	}
+	s3err.WriteAwsXMLResponse(w, r, http.StatusOK, &result)
+}
+
 func (s3a *S3ApiServer) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
 
 	bucket, object := s3_constants.GetBucketAndObject(r)

weed/s3api/s3api_object_skip_handlers.go

@@ -4,14 +4,6 @@ import (
 	"net/http"
 )
 
-// GetObjectAclHandler Put object ACL
-// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAcl.html
-func (s3a *S3ApiServer) GetObjectAclHandler(w http.ResponseWriter, r *http.Request) {
-
-	w.WriteHeader(http.StatusNoContent)
-
-}
-
 // PutObjectAclHandler Put object ACL
 // https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectAcl.html
 func (s3a *S3ApiServer) PutObjectAclHandler(w http.ResponseWriter, r *http.Request) {