public function go()
 {
     $id = Request::get_id();
     $c_id = Request::get_c_id();
     $repo = LinkRepository::instance();
     $link = $repo->find_one_by_id($c_id, $id);
     $url = $link->url;
     event_link($id);
     Header::cache_control('no-store, no-cache, must-revalidate');
     Header::pragma('no-cache');
     Redirect::go($url);
 }
 public function validate_link()
 {
     $c_id = Request::get_c_id();
     $id = Request::get_id();
     $repo = LinkRepository::instance();
     $link = $repo->find_one_by_id($c_id, $id);
     $success = $link ? $link->validate() : false;
     $this->response($success);
 }