refactoring

some previous chunk etag was using md5, which should be wrong.

weed/server/webdav_server.go

@@ -418,17 +418,7 @@ func (f *WebDavFile) Write(buf []byte) (int, error) {
 		return 0, fmt.Errorf("upload result: %v", uploadResult.Error)
 	}
 
-	chunk := &filer_pb.FileChunk{
-		FileId:    fileId,
-		Offset:    f.off,
-		Size:      uint64(len(buf)),
-		Mtime:     time.Now().UnixNano(),
-		ETag:      uploadResult.ETag,
-		CipherKey: uploadResult.CipherKey,
-		IsGzipped: uploadResult.Gzip > 0,
-	}
-
-	f.entry.Chunks = append(f.entry.Chunks, chunk)
+	f.entry.Chunks = append(f.entry.Chunks, uploadResult.ToPbFileChunk(fileId, f.off))
 
 	err = f.fs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 		f.entry.Attributes.Mtime = time.Now().Unix()