/**
* Throw a 403 and redirect to this controller. Replaces Security::permissionFailure()
* @param RequestHandler $c
* @return SS_HTTPResponse
*/
public static function permission_failure(RequestHandler $c)
{
return $c->redirect(HTTP::setGetVar('BackURL', $_SERVER['REQUEST_URI'], Controller::join_links(Director::baseURL(), 'summit-login', 'login')), 403);
}