/**
  * @param Application $app
  * @param $file
  * @return \Symfony\Component\HttpFoundation\BinaryFileResponse|void
  */
 public function getUserFile(Application $app, $file)
 {
     try {
         $file = $app['chamilo.filesystem']->get('upload/users/' . $file);
         return $app->sendFile($file->getPathname());
     } catch (\InvalidArgumentException $e) {
         return $app->abort(404, 'File not found');
     }
 }