/**
  * @PublicPage
  * @UseSession
  *
  * @param string $user
  * @param string $password
  * @param string $redirect_url
  * @return RedirectResponse
  */
 public function tryLogin($user, $password, $redirect_url)
 {
     $originalUser = $user;
     // TODO: Add all the insane error handling
     /* @var $loginResult IUser */
     $loginResult = $this->userManager->checkPassword($user, $password);
     if ($loginResult === false) {
         $users = $this->userManager->getByEmail($user);
         // we only allow login by email if unique
         if (count($users) === 1) {
             $user = $users[0]->getUID();
             $loginResult = $this->userManager->checkPassword($user, $password);
         }
     }
     if ($loginResult === false) {
         $this->session->set('loginMessages', [['invalidpassword']]);
         // Read current user and append if possible - we need to return the unmodified user otherwise we will leak the login name
         $args = !is_null($user) ? ['user' => $originalUser] : [];
         return new RedirectResponse($this->urlGenerator->linkToRoute('core.login.showLoginForm', $args));
     }
     // TODO: remove password checks from above and let the user session handle failures
     // requires https://github.com/owncloud/core/pull/24616
     $this->userSession->login($user, $password);
     $this->userSession->createSessionToken($this->request, $loginResult->getUID(), $user, $password);
     if ($this->twoFactorManager->isTwoFactorAuthenticated($loginResult)) {
         $this->twoFactorManager->prepareTwoFactorLogin($loginResult);
         if (!is_null($redirect_url)) {
             return new RedirectResponse($this->urlGenerator->linkToRoute('core.TwoFactorChallenge.selectChallenge', ['redirect_url' => $redirect_url]));
         }
         return new RedirectResponse($this->urlGenerator->linkToRoute('core.TwoFactorChallenge.selectChallenge'));
     }
     if (!is_null($redirect_url) && $this->userSession->isLoggedIn()) {
         $location = $this->urlGenerator->getAbsoluteURL(urldecode($redirect_url));
         // Deny the redirect if the URL contains a @
         // This prevents unvalidated redirects like ?redirect_url=:user@domain.com
         if (strpos($location, '@') === false) {
             return new RedirectResponse($location);
         }
     }
     return new RedirectResponse($this->urlGenerator->linkToRoute('files.view.index'));
 }