function MaintenanceModeSubscriber::onKernelRequestMaintenance

Returns the site maintenance page if the site is offline.

Parameters

\Symfony\Component\HttpKernel\Event\RequestEvent $event: The event to process.

File

core/lib/Drupal/Core/EventSubscriber/MaintenanceModeSubscriber.php, line 114

Class

MaintenanceModeSubscriber

Maintenance mode subscriber for controller requests.

Namespace

Code

public function onKernelRequestMaintenance(RequestEvent $event) {
  $request = $event->getRequest();
  $route_match = RouteMatch::createFromRequest($request);
  if ($this->maintenanceMode
    ->applies($route_match)) {
    // Don't cache maintenance mode pages.
    \Drupal::service('page_cache_kill_switch')->trigger();
    if (!$this->maintenanceMode
      ->exempt($this->account)) {
      // When the account is not exempt, other subscribers handle request.
      $this->eventDispatcher
        ->dispatch($event, MaintenanceModeEvents::MAINTENANCE_MODE_REQUEST);
    }
    else {
      // Display a message if the logged-in user has access to the site in
      // maintenance mode. Don't show maintenance message:
      // - on AJAX requests.
      // - on Iframe uploads.
      // - on the maintenance mode settings page.
      if ($route_match->getRouteName() != 'system.site_maintenance_mode') {
        $show_message = $route_match->getRouteName() != 'system.site_maintenance_mode' && !$event->getRequest()
          ->isXmlHttpRequest() && $event->getRequest()
          ->get('ajax_iframe_upload', FALSE) === FALSE;
        if ($show_message) {
          if ($this->account
            ->hasPermission('administer site configuration')) {
            $this->messenger
              ->addMessage($this->t('Operating in maintenance mode. <a href=":url">Go online.</a>', [
              ':url' => $this->urlGenerator
                ->generate('system.site_maintenance_mode'),
            ]), 'status', FALSE);
          }
          else {
            $this->messenger
              ->addMessage($this->t('Operating in maintenance mode.'), 'status', FALSE);
          }
        }
      }
    }
  }
}