class ContentTranslationRouteSubscriber

class ContentTranslationRouteSubscriber extends RouteSubscriberBase {
    
    /**
     * The content translation manager.
     *
     * @var \Drupal\content_translation\ContentTranslationManagerInterface
     */
    protected $contentTranslationManager;
    
    /**
     * Constructs a ContentTranslationRouteSubscriber object.
     *
     * @param \Drupal\content_translation\ContentTranslationManagerInterface $content_translation_manager
     *   The content translation manager.
     */
    public function __construct(ContentTranslationManagerInterface $content_translation_manager) {
        $this->contentTranslationManager = $content_translation_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function alterRoutes(RouteCollection $collection) {
        foreach ($this->contentTranslationManager
            ->getSupportedEntityTypes() as $entity_type_id => $entity_type) {
            // Inherit admin route status from edit route, if exists.
            $is_admin = FALSE;
            $route_name = "entity.{$entity_type_id}.edit_form";
            if ($edit_route = $collection->get($route_name)) {
                $is_admin = (bool) $edit_route->getOption('_admin_route');
            }
            $load_latest_revision = ContentTranslationManager::isPendingRevisionSupportEnabled($entity_type_id);
            if ($entity_type->hasLinkTemplate('drupal:content-translation-overview')) {
                $route = new Route($entity_type->getLinkTemplate('drupal:content-translation-overview'), [
                    '_controller' => '\\Drupal\\content_translation\\Controller\\ContentTranslationController::overview',
                    'entity_type_id' => $entity_type_id,
                ], [
                    '_entity_access' => $entity_type_id . '.view',
                    '_access_content_translation_overview' => $entity_type_id,
                ], [
                    'parameters' => [
                        $entity_type_id => [
                            'type' => 'entity:' . $entity_type_id,
                            'load_latest_revision' => $load_latest_revision,
                        ],
                    ],
                    '_admin_route' => $is_admin,
                ]);
                $route_name = "entity.{$entity_type_id}.content_translation_overview";
                $collection->add($route_name, $route);
            }
            if ($entity_type->hasLinkTemplate('drupal:content-translation-add')) {
                $route = new Route($entity_type->getLinkTemplate('drupal:content-translation-add'), [
                    '_controller' => '\\Drupal\\content_translation\\Controller\\ContentTranslationController::add',
                    'source' => NULL,
                    'target' => NULL,
                    '_title' => 'Add',
                    'entity_type_id' => $entity_type_id,
                ], [
                    '_entity_access' => $entity_type_id . '.view',
                    '_access_content_translation_manage' => 'create',
                ], [
                    'parameters' => [
                        'source' => [
                            'type' => 'language',
                        ],
                        'target' => [
                            'type' => 'language',
                        ],
                        $entity_type_id => [
                            'type' => 'entity:' . $entity_type_id,
                            'load_latest_revision' => $load_latest_revision,
                        ],
                    ],
                    '_admin_route' => $is_admin,
                ]);
                $collection->add("entity.{$entity_type_id}.content_translation_add", $route);
            }
            if ($entity_type->hasLinkTemplate('drupal:content-translation-edit')) {
                $route = new Route($entity_type->getLinkTemplate('drupal:content-translation-edit'), [
                    '_controller' => '\\Drupal\\content_translation\\Controller\\ContentTranslationController::edit',
                    'language' => NULL,
                    '_title' => 'Edit',
                    'entity_type_id' => $entity_type_id,
                ], [
                    '_access_content_translation_manage' => 'update',
                ], [
                    'parameters' => [
                        'language' => [
                            'type' => 'language',
                        ],
                        $entity_type_id => [
                            'type' => 'entity:' . $entity_type_id,
                            'load_latest_revision' => $load_latest_revision,
                        ],
                    ],
                    '_admin_route' => $is_admin,
                ]);
                $collection->add("entity.{$entity_type_id}.content_translation_edit", $route);
            }
            if ($entity_type->hasLinkTemplate('drupal:content-translation-delete')) {
                $route = new Route($entity_type->getLinkTemplate('drupal:content-translation-delete'), [
                    '_entity_form' => $entity_type_id . '.content_translation_deletion',
                    'language' => NULL,
                    '_title' => 'Delete',
                    'entity_type_id' => $entity_type_id,
                ], [
                    '_access_content_translation_manage' => 'delete',
                ], [
                    'parameters' => [
                        'language' => [
                            'type' => 'language',
                        ],
                        $entity_type_id => [
                            'type' => 'entity:' . $entity_type_id,
                            'load_latest_revision' => $load_latest_revision,
                        ],
                    ],
                    '_admin_route' => $is_admin,
                ]);
                $collection->add("entity.{$entity_type_id}.content_translation_delete", $route);
            }
            // Add our custom translation deletion access checker.
            if ($load_latest_revision) {
                $entity_delete_route = $collection->get("entity.{$entity_type_id}.delete_form");
                if ($entity_delete_route) {
                    $entity_delete_route->addRequirements([
                        '_access_content_translation_delete' => "{$entity_type_id}.delete",
                    ]);
                }
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() {
        $events = parent::getSubscribedEvents();
        // Should run after AdminRouteSubscriber so the routes can inherit admin
        // status of the edit routes on entities. Therefore priority -210.
        $events[RoutingEvents::ALTER] = [
            'onAlterRoutes',
            -210,
        ];
        return $events;
    }

}