class JsonapiMaintenanceModeSubscriber in Drupal 10

Maintenance mode subscriber for JSON:API requests.

@internal JSON:API maintains no PHP API. The API is the HTTP API. This class may change at any time and could break any dependencies on it.

Hierarchy

• class \Drupal\jsonapi\EventSubscriber\JsonapiMaintenanceModeSubscriber implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

1 string reference to 'JsonapiMaintenanceModeSubscriber'

jsonapi.services.yml in core/modules/jsonapi/jsonapi.services.yml

core/modules/jsonapi/jsonapi.services.yml

1 service uses JsonapiMaintenanceModeSubscriber

jsonapi.maintenance_mode_subscriber in core/modules/jsonapi/jsonapi.services.yml

Drupal\jsonapi\EventSubscriber\JsonapiMaintenanceModeSubscriber

File

core/modules/jsonapi/src/EventSubscriber/JsonapiMaintenanceModeSubscriber.php, line 23

Namespace

Drupal\jsonapi\EventSubscriber

class JsonapiMaintenanceModeSubscriber implements EventSubscriberInterface {

  /**
   * The maintenance mode.
   *
   * @var \Drupal\Core\Site\MaintenanceMode
   */
  protected $maintenanceMode;

  /**
   * The configuration factory.
   *
   * @var \Drupal\Core\Config\ConfigFactoryInterface
   */
  protected $config;

  /**
   * Constructs a new JsonapiMaintenanceModeSubscriber.
   *
   * @param \Drupal\Core\Site\MaintenanceModeInterface $maintenance_mode
   *   The maintenance mode.
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The config factory.
   */
  public function __construct(MaintenanceModeInterface $maintenance_mode, ConfigFactoryInterface $config_factory) {
    $this->maintenanceMode = $maintenance_mode;
    $this->config = $config_factory;
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events = [];
    $events[MaintenanceModeEvents::MAINTENANCE_MODE_REQUEST][] = [
      'onMaintenanceModeRequest',
      -800,
    ];
    return $events;
  }

  /**
   * Returns response when site is in maintenance mode and user is not exempt.
   *
   * @param \Symfony\Component\HttpKernel\Event\RequestEvent $event
   *   The event to process.
   */
  public function onMaintenanceModeRequest(RequestEvent $event) {
    $request = $event
      ->getRequest();
    if ($request
      ->getRequestFormat() !== 'api_json') {
      return;
    }

    // Retry-After will be random within a range defined in jsonapi settings.
    // The goals are to keep it short and to reduce the thundering herd problem.
    $header_settings = $this->config
      ->get('jsonapi.settings')
      ->get('maintenance_header_retry_seconds');
    $retry_after_time = rand($header_settings['min'], $header_settings['max']);
    $http_exception = new HttpException(503, $this->maintenanceMode
      ->getSiteMaintenanceMessage());
    $document = new JsonApiDocumentTopLevel(new ErrorCollection([
      $http_exception,
    ]), new NullIncludedData(), new LinkCollection([]));
    $response = new ResourceResponse($document, $http_exception
      ->getStatusCode(), [
      'Content-Type' => 'application/vnd.api+json',
      'Retry-After' => $retry_after_time,
    ]);

    // Calling RequestEvent::setResponse() also stops propagation of event.
    $event
      ->setResponse($response);
  }

}