Ojs\UserBundle\Controller\SecurityController::loginAction PHP Méthode

    public function loginAction(Request $request)
    {
        if ($this->getUser()) {
            return $this->redirect($this->generateUrl('ojs_public_index'));
        }
        /** @var $session \Symfony\Component\HttpFoundation\Session\Session */
        $session = $request->getSession();
        if (class_exists('\\Symfony\\Component\\Security\\Core\\Security')) {
            $authErrorKey = Security::AUTHENTICATION_ERROR;
            $lastUsernameKey = Security::LAST_USERNAME;
        } else {
            // BC for SF < 2.6
            $authErrorKey = Security::AUTHENTICATION_ERROR;
            $lastUsernameKey = Security::LAST_USERNAME;
        }
        // get the error if any (works with forward and redirect -- see below)
        if ($request->attributes->has($authErrorKey)) {
            $error = $request->attributes->get($authErrorKey);
        } elseif (null !== $session && $session->has($authErrorKey)) {
            $error = $session->get($authErrorKey);
            $session->remove($authErrorKey);
        } else {
            $error = null;
        }
        if (!$error instanceof AuthenticationException) {
            $error = null;
            // The value does not come from the security component.
        }
        // last username entered by the user
        $lastUsername = null === $session ? '' : $session->get($lastUsernameKey);
        if ($this->has('security.csrf.token_manager')) {
            $csrfToken = $this->get('security.csrf.token_manager')->getToken('authenticate')->getValue();
        } else {
            // BC for SF < 2.4
            $csrfToken = $this->has('form.csrf_provider') ? $this->get('form.csrf_provider')->generateCsrfToken('authenticate') : null;
        }
        return $this->render('OjsUserBundle:Security:login.html.twig', array('last_username' => $lastUsername, 'error' => $error, 'csrf_token' => $csrfToken));
    }