add bucket tagging support (#9389)

This patch also simplifies object tagging support

cmd/api-errors.go

@@ -28,13 +28,13 @@ import (
 	"google.golang.org/api/googleapi"
 
 	minio "github.com/minio/minio-go/v6"
+	"github.com/minio/minio-go/v6/pkg/tags"
 	"github.com/minio/minio/cmd/config/etcd/dns"
 	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/auth"
 	"github.com/minio/minio/pkg/bucket/lifecycle"
 	objectlock "github.com/minio/minio/pkg/bucket/object/lock"
-	"github.com/minio/minio/pkg/bucket/object/tagging"
 	"github.com/minio/minio/pkg/bucket/policy"
 	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/hash"
@@ -157,6 +157,7 @@ const (
 	ErrInvalidRetentionDate
 	ErrPastObjectLockRetainDate
 	ErrUnknownWORMModeDirective
+	ErrBucketTaggingNotFound
 	ErrObjectLockInvalidHeaders
 	ErrInvalidTagDirective
 	// Add new error codes here.
@@ -777,6 +778,11 @@ var errorCodes = errorCodeMap{
 		Description:    "Bucket is missing ObjectLockConfiguration",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrBucketTaggingNotFound: {
+		Code:           "NoSuchTagSet",
+		Description:    "The TagSet does not exist",
+		HTTPStatusCode: http.StatusNotFound,
+	},
 	ErrObjectLockConfigurationNotFound: {
 		Code:           "ObjectLockConfigurationNotFoundError",
 		Description:    "Object Lock configuration does not exist for this bucket",
@@ -1896,7 +1902,7 @@ func toAPIError(ctx context.Context, err error) APIError {
 				Description:    e.Error(),
 				HTTPStatusCode: http.StatusBadRequest,
 			}
-		case tagging.Error:
+		case tags.Error:
 			apiErr = APIError{
 				Code:           e.Code(),
 				Description:    e.Error(),