Content-Disposition HTTP header in mediaapi's responses added (#685)

This should fix #628
I also Noticed that GET /_matrix/media/r0/download/{serverName}/{mediaId}/{fileName} is not yet implemented, but it should work for both.

Signed-off-by: Kouamé Behouba Manassé behouba@gmail.com

mediaapi/routing/download.go

@@ -305,6 +305,10 @@ func (r *downloadRequest) respondFromLocalFile(
 		}).Info("Responding with file")
 		responseFile = file
 		responseMetadata = r.MediaMetadata
+
+		if len(responseMetadata.UploadName) > 0 {
+			w.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename*=utf-8"%s"`, responseMetadata.UploadName))
+		}
 	}
 
 	w.Header().Set("Content-Type", string(responseMetadata.ContentType))