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<?php
namespace Drupal\jsonapi\EventSubscriber;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Site\MaintenanceModeEvents;
use Drupal\Core\Site\MaintenanceModeInterface;
use Drupal\jsonapi\JsonApiResource\ErrorCollection;
use Drupal\jsonapi\JsonApiResource\JsonApiDocumentTopLevel;
use Drupal\jsonapi\JsonApiResource\LinkCollection;
use Drupal\jsonapi\JsonApiResource\NullIncludedData;
use Drupal\jsonapi\ResourceResponse;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\Exception\HttpException;
/**
* 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.
*/
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(): array {
$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);
}
}
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