/**
  * Default action, displays the login screen
  *
  * @param string $username Optional: A username to pre-fill into the username field
  * @param boolean $unauthorized
  * @return void
  */
 public function indexAction($username = null, $unauthorized = false)
 {
     if ($this->securityContext->getInterceptedRequest() || $unauthorized) {
         $this->response->setStatus(401);
     }
     if ($this->authenticationManager->isAuthenticated()) {
         $this->redirect('index', 'Backend\\Backend');
     }
     $currentDomain = $this->domainRepository->findOneByActiveRequest();
     $currentSite = $currentDomain !== null ? $currentDomain->getSite() : $this->siteRepository->findDefault();
     $this->view->assignMultiple(['styles' => array_filter($this->settings['userInterface']['backendLoginForm']['stylesheets']), 'username' => $username, 'site' => $currentSite]);
 }