function MaintenanceModeSubscriber::onKernelRequestMaintenance

Returns the site maintenance page if the site is offline.

Parameters

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

File

core/lib/Drupal/Core/EventSubscriber/MaintenanceModeSubscriber.php, line 103

Class

MaintenanceModeSubscriber

Maintenance mode subscriber for controller requests.

Namespace

Code

public function onKernelRequestMaintenance(GetResponseEvent $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)) {
            // Deliver the 503 page if the site is in maintenance mode and the
            // logged in user is not allowed to bypass it.
            // If the request format is not 'html' then show default maintenance
            // mode page else show a text/plain page with maintenance message.
            if ($request->getRequestFormat() !== 'html') {
                $response = new Response($this->getSiteMaintenanceMessage(), 503, [
                    'Content-Type' => 'text/plain',
                ]);
                $event->setResponse($response);
                return;
            }
            drupal_maintenance_theme();
            $response = $this->bareHtmlPageRenderer
                ->renderBarePage([
                '#markup' => $this->getSiteMaintenanceMessage(),
            ], $this->t('Site under maintenance'), 'maintenance_page');
            $response->setStatusCode(503);
            $event->setResponse($response);
        }
        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);
                }
            }
        }
    }
}