/**
  * Action to generate a new Google Authenticator secret for the current user
  *
  * @return string
  * @throws \Exception
  * @throws \Piwik\NoAccessException
  */
 public function regenerate()
 {
     Piwik::checkUserIsNotAnonymous();
     $view = new View('@GoogleAuthenticator/regenerate');
     $this->setGeneralVariablesView($view);
     $googleAuth = new PHPGangsta\GoogleAuthenticator();
     $storage = new Storage(Piwik::getCurrentUserLogin());
     $secret = Common::getRequestVar('gasecret', '', 'string');
     $authCode = Common::getRequestVar('gaauthcode', '', 'string');
     $authCodeNonce = Common::getRequestVar('authCodeNonce', '', 'string');
     $title = Common::getRequestVar('gatitle', $storage->getTitle(), 'string');
     $description = Common::getRequestVar('gadescription', $storage->getDescription(), 'string');
     if (!empty($secret) && !empty($authCode) && Nonce::verifyNonce(self::AUTH_CODE_NONCE, $authCodeNonce) && $googleAuth->verifyCode($secret, $authCode, 2)) {
         $storage->setSecret($secret);
         $storage->setDescription($description);
         $storage->setTitle($title);
         $this->auth->setAuthCode($authCode);
         $this->auth->validateAuthCode();
         Url::redirectToUrl(Url::getCurrentUrlWithoutQueryString() . Url::getCurrentQueryStringWithParametersModified(array('action' => 'settings', 'activate' => '1')));
     }
     if (empty($secret)) {
         $secret = $googleAuth->createSecret(32);
     }
     $view->title = $title;
     $view->description = $description;
     $view->authCodeNonce = Nonce::getNonce(self::AUTH_CODE_NONCE);
     $view->newSecret = $secret;
     $view->googleAuthImage = $googleAuth->getQRCodeGoogleUrl($description, $secret, $title);
     return $view->render();
 }