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);
                    }
                }
            }
        }
    }
}