fix: Adds a check to ensure that the CompleteMultipartUpload parts are not empty.

s3err/s3err.go

@@ -72,6 +72,7 @@ const (
 	ErrInvalidPartNumberMarker
 	ErrInvalidObjectAttributes
 	ErrInvalidPart
+	ErrEmptyParts
 	ErrInvalidPartNumber
 	ErrInternalError
 	ErrInvalidCopyDest
@@ -253,6 +254,11 @@ var errorCodeResponse = map[ErrorCode]APIError{
 		Description:    "One or more of the specified parts could not be found.  The part may not have been uploaded, or the specified entity tag may not match the part's entity tag.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrEmptyParts: {
+		Code:           "InvalidRequest",
+		Description:    "You must specify at least one part",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrInvalidPartNumber: {
 		Code:           "InvalidArgument",
 		Description:    "Part number must be an integer between 1 and 10000, inclusive.",