Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\system\EventSubscriber;
Chris@0: 
Chris@0: use Drupal\Core\Routing\RouteSubscriberBase;
Chris@0: use Drupal\Core\Routing\RoutingEvents;
Chris@14: use Symfony\Component\Routing\Route;
Chris@0: use Symfony\Component\Routing\RouteCollection;
Chris@0: 
Chris@0: /**
Chris@14:  * Adds the _admin_route option to each admin HTML route.
Chris@0:  */
Chris@0: class AdminRouteSubscriber extends RouteSubscriberBase {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function alterRoutes(RouteCollection $collection) {
Chris@0:     foreach ($collection->all() as $route) {
Chris@14:       if (strpos($route->getPath(), '/admin') === 0 && !$route->hasOption('_admin_route') && static::isHtmlRoute($route)) {
Chris@0:         $route->setOption('_admin_route', TRUE);
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     $events = parent::getSubscribedEvents();
Chris@0: 
Chris@0:     // Use a lower priority than \Drupal\field_ui\Routing\RouteSubscriber or
Chris@0:     // \Drupal\views\EventSubscriber\RouteSubscriber to ensure we add the option
Chris@0:     // to their routes.
Chris@0:     $events[RoutingEvents::ALTER] = ['onAlterRoutes', -200];
Chris@0: 
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@14:   /**
Chris@14:    * Determines whether the given route is a HTML route.
Chris@14:    *
Chris@14:    * @param \Symfony\Component\Routing\Route $route
Chris@14:    *   The route to analyze.
Chris@14:    *
Chris@14:    * @return bool
Chris@14:    *   TRUE if HTML is a valid format for this route.
Chris@14:    */
Chris@14:   protected static function isHtmlRoute(Route $route) {
Chris@14:     // If a route has no explicit format, then HTML is valid.
Chris@14:     $format = $route->hasRequirement('_format') ? explode('|', $route->getRequirement('_format')) : ['html'];
Chris@14:     return in_array('html', $format, TRUE);
Chris@14:   }
Chris@14: 
Chris@0: }