EntityRouteAlterSubscriber.php

<?php

namespace Drupal\Core\EventSubscriber;

use Drupal\Core\Entity\EntityResolverManager;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Drupal\Core\Routing\RoutingEvents;
use Drupal\Core\Routing\RouteBuildEvent;

/**
 * Registers the 'type' of route parameter names that match an entity type.
 *
 * @todo Matching on parameter *name* is not ideal, because it breaks
 *   encapsulation: parameter names are local to the controller and route, and
 *   controllers and routes can't be expected to know what all possible entity
 *   types might exist across all modules in order to pick names that don't
 *   conflict. Instead, the 'type' should be determined from introspecting what
 *   kind of PHP variable (e.g., a type hinted interface) the controller
 *   requires: https://www.drupal.org/node/2041907.
 */
class EntityRouteAlterSubscriber implements EventSubscriberInterface {
    
    /**
     * The entity resolver manager.
     *
     * @var \Drupal\Core\Entity\EntityResolverManager
     */
    protected $resolverManager;
    
    /**
     * Constructs an EntityRouteAlterSubscriber instance.
     *
     * @param \Drupal\Core\Entity\EntityResolverManager $entity_resolver_manager
     *   The entity resolver manager.
     */
    public function __construct(EntityResolverManager $entity_resolver_manager) {
        $this->resolverManager = $entity_resolver_manager;
    }
    
    /**
     * Applies parameter converters to route parameters.
     *
     * @param \Drupal\Core\Routing\RouteBuildEvent $event
     *   The event to process.
     */
    public function onRoutingRouteAlterSetType(RouteBuildEvent $event) {
        foreach ($event->getRouteCollection() as $route) {
            $this->resolverManager
                ->setRouteOptions($route);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() {
        $events[RoutingEvents::ALTER][] = [
            'onRoutingRouteAlterSetType',
            -150,
        ];
        return $events;
    }

}