subentity-1.x-dev/src/EntityHtmlRouteProvider.php

<?php

namespace Drupal\subentity;

use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
use Symfony\Component\Routing\Route;

/**
 * Provides routes for Sub entities.
 *
 * @see Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
 * @see Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
 */
class EntityHtmlRouteProvider extends AdminHtmlRouteProvider {

  /**
   * {@inheritdoc}
   */
  public function getRoutes(EntityTypeInterface $entity_type) {
    $collection = parent::getRoutes($entity_type);

    $entity_type_id = $entity_type->id();

    $add_form_route = $this->getAddFormRoute($entity_type);
    if ($add_form_route) {
      $collection->add("entity.{$entity_type_id}.add_form", $add_form_route);
    }

    $settings_form_route = $this->getSettingsFormRoute($entity_type);
    if ($settings_form_route) {
      $collection->add("$entity_type_id.settings", $settings_form_route);
    }

    return $collection;
  }

  /**
   * Gets the add-form route.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The entity type.
   *
   * @return \Symfony\Component\Routing\Route|null
   *   The generated route, if available.
   */
  protected function getAddFormRoute(EntityTypeInterface $entity_type) {
    $addFormPath = $entity_type->getLinkTemplate('add-form');
    if (is_string($addFormPath)) {
      $entity_type_id = $entity_type->id();
      $parameters = [
        $entity_type_id => ['type' => 'entity:' . $entity_type_id],
      ];

      $route = new Route($addFormPath);
      // Use the add form handler, if available, otherwise default.
      $operation = 'default';
      if ($entity_type->getFormClass('add')) {
        $operation = 'add';
      }
      $route
        ->setDefaults([
          '_entity_form' => "{$entity_type_id}.{$operation}",
          '_title' => "Add {$entity_type->getLabel()}",
        ])
        ->setRequirement('_entity_create_access', $entity_type_id);

      $route
        ->setOption('parameters', $parameters)
        ->setOption('_admin_route', TRUE);

      return $route;
    }

    return NULL;
  }

  /**
   * Gets the settings form route.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The entity type.
   *
   * @return \Symfony\Component\Routing\Route|null
   *   The generated route, if available.
   */
  protected function getSettingsFormRoute(EntityTypeInterface $entity_type) {
    if (!$entity_type->getBundleEntityType()) {
      $route = new Route("/admin/structure/subentities/{$entity_type->id()}");
      $route
        ->setDefaults([
          '_form' => $entity_type->getFormClass('settings'),
          '_title' => "{$entity_type->getLabel()} settings",
        ])
        ->setOption('_admin_route', TRUE);

      $adminPermission = $entity_type->getAdminPermission();
      if (is_string($adminPermission)) {
        $route->setRequirement('_permission', $adminPermission);
      }

      return $route;
    }

    return NULL;
  }

}