For missing parts reply back as InvalidPart{}

pkg/donut/errors.go

@@ -335,6 +335,13 @@ func (e MissingDateHeader) Error() string {
 	return "Missing date header"
 }
 
+// InvalidPart One or more of the specified parts could not be found
+type InvalidPart struct{}
+
+func (e InvalidPart) Error() string {
+	return "One or more of the specified parts could not be found"
+}
+
 // InvalidPartOrder parts are not ordered as Requested
 type InvalidPartOrder struct {
 	UploadID string

pkg/donut/multipart.go

@@ -286,7 +286,7 @@ func (donut API) CompleteMultipartUpload(bucket, key, uploadID string, data io.R
 		object, ok := donut.multiPartObjects[uploadID].Get(parts.Part[i].PartNumber)
 		if ok == false {
 			donut.lock.Unlock()
-			return ObjectMetadata{}, iodine.New(errors.New("missing part: "+strconv.Itoa(parts.Part[i].PartNumber)), nil)
+			return ObjectMetadata{}, iodine.New(InvalidPart{}, nil)
 		}
 		size += int64(len(object))
 		calcMD5Bytes := md5.Sum(object)

pkg/server/api/object-handlers.go

@@ -558,6 +558,8 @@ func (api Minio) CompleteMultipartUploadHandler(w http.ResponseWriter, req *http
 		}
 	case donut.InvalidUploadID:
 		writeErrorResponse(w, req, NoSuchUpload, acceptsContentType, req.URL.Path)
+	case donut.InvalidPart:
+		writeErrorResponse(w, req, InvalidPart, acceptsContentType, req.URL.Path)
 	case donut.InvalidPartOrder:
 		writeErrorResponse(w, req, InvalidPartOrder, acceptsContentType, req.URL.Path)
 	case donut.MissingDateHeader: