response from controller event

SudoListener.php

class SudoListener {
    public function onKernelController(FilterControllerEvent $event) {
	$controller = $event->getController();

	$token = $this->tokenStorage->getToken();

	if ($token === null || ($user = $token->getUser()) === null) {
		return;
	}
	if (!is_array($controller)) {
		return;
	}

	if ($controller[0] instanceof SudoControllerInterface) {
		$key = UserCacheHelper::getSudoKey($user);

		$value = $this->client->get($key);

		if (!$value || $value === null) {
			$redirect = $this->router->generate('user_sudo');

			$event->setController(function() use ($redirect) {
				return new RedirectResponse($redirect);
			});
		}
	}
    }
}