support swift (#4480)

weed/remote_storage/s3/s3_storage_client.go

@@ -160,13 +160,16 @@ func (s *s3RemoteStorageClient) WriteFile(loc *remote_pb.RemoteStorageLocation,
 
 	// process tagging
 	tags := ""
-	if s.supportTagging {
+	var awsTags *string
+	// openstack swift doesn't support s3 object tagging
+	if s.conf.S3SupportTagging {
 		for k, v := range entry.Extended {
 			if len(tags) > 0 {
 				tags = tags + "&"
 			}
 			tags = tags + k + "=" + string(v)
 		}
+		awsTags = aws.String(tags)
 	}
 
 	// Upload the file to S3.
@@ -174,7 +177,7 @@ func (s *s3RemoteStorageClient) WriteFile(loc *remote_pb.RemoteStorageLocation,
 		Bucket:       aws.String(loc.Bucket),
 		Key:          aws.String(loc.Path[1:]),
 		Body:         reader,
-		Tagging:      aws.String(tags),
+		Tagging:      awsTags,
 		StorageClass: aws.String(s.conf.S3StorageClass),
 	})