public function sort_links()
 {
     if (!$this->is_allowed_to_edit()) {
         $this->forbidden();
         return;
     }
     $c_id = Request::get_c_id();
     $ids = Request::get_ids();
     if (empty($ids)) {
         return;
     }
     $repo = LinkRepository::instance();
     $success = $repo->order($c_id, $ids);
     $this->response($success);
 }