public static function getInternalRemoteUrl(FileSync $file_sync)
{
KalturaLog::log("File Sync [{$file_sync->getId()}]");
// LOG retrieval
$dc = self::getDcById($file_sync->getDc());
$file_sync_id = $file_sync->getId();
$file_hash = md5($dc["secret"] . $file_sync_id);
// will be verified on the other side to make sure not some attack or external invalid request
$filename = 'f.' . $file_sync->getFileExt();
$build_remote_url = $dc["url"] . "/index.php/extwidget/servefile/id/{$file_sync_id}/hash/{$file_hash}/f/{$filename}";
// or something similar
return $build_remote_url;
}