Eccube\Controller\ShoppingController::login PHP Method

    public function login(Application $app, Request $request)
    {
        if (!$app['eccube.service.cart']->isLocked()) {
            return $app->redirect($app->url('cart'));
        }
        if ($app->isGranted('IS_AUTHENTICATED_FULLY')) {
            return $app->redirect($app->url('shopping'));
        }
        /* @var $form \Symfony\Component\Form\FormInterface */
        $builder = $app['form.factory']->createNamedBuilder('', 'customer_login');
        if ($app->isGranted('IS_AUTHENTICATED_REMEMBERED')) {
            $Customer = $app->user();
            if ($Customer) {
                $builder->get('login_email')->setData($Customer->getEmail());
            }
        }
        $event = new EventArgs(array('builder' => $builder), $request);
        $app['eccube.event.dispatcher']->dispatch(EccubeEvents::FRONT_SHOPPING_LOGIN_INITIALIZE, $event);
        $form = $builder->getForm();
        return $app->render('Shopping/login.twig', array('error' => $app['security.last_error']($request), 'form' => $form->createView()));
    }