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 118

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. However, suppress it on the maintenance mode
      // settings page.
      if ($route_match->getRouteName() != 'system.site_maintenance_mode') {
        if ($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);
        }
      }
    }
  }
}