Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/field_ui/src/Routing/FieldUiRouteEnhancer.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\field_ui\Routing\FieldUiRouteEnhancer.
+ */
+
+namespace Drupal\field_ui\Routing;
+
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Routing\Enhancer\RouteEnhancerInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Enhances Field UI routes by adding proper information about the bundle name.
+ */
+class FieldUiRouteEnhancer implements RouteEnhancerInterface {
+
+  /**
+   * The entity manager.
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * Constructs a FieldUiRouteEnhancer object.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   */
+  public function __construct(EntityManagerInterface $entity_manager) {
+    $this->entityManager = $entity_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function enhance(array $defaults, Request $request) {
+    if (($bundle = $this->entityManager->getDefinition($defaults['entity_type_id'])->getBundleEntityType()) && isset($defaults[$bundle])) {
+      // Field UI forms only need the actual name of the bundle they're dealing
+      // with, not an upcasted entity object, so provide a simple way for them
+      // to get it.
+      $defaults['bundle'] = $defaults['_raw_variables']->get($bundle);
+    }
+
+    return $defaults;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(Route $route) {
+    return ($route->hasOption('_field_ui'));
+  }
+
+}

core/modules/field_ui/src/Routing/RouteSubscriber.php

@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\field_ui\Routing\RouteSubscriber.
+ */
+
+namespace Drupal\field_ui\Routing;
+
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Routing\RouteSubscriberBase;
+use Drupal\Core\Routing\RoutingEvents;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * Subscriber for Field UI routes.
+ */
+class RouteSubscriber extends RouteSubscriberBase {
+
+  /**
+   * The entity type manager
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $manager;
+
+  /**
+   * Constructs a RouteSubscriber object.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $manager
+   *   The entity type manager.
+   */
+  public function __construct(EntityManagerInterface $manager) {
+    $this->manager = $manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function alterRoutes(RouteCollection $collection) {
+    foreach ($this->manager->getDefinitions() as $entity_type_id => $entity_type) {
+      if ($route_name = $entity_type->get('field_ui_base_route')) {
+        // Try to get the route from the current collection.
+        if (!$entity_route = $collection->get($route_name)) {
+          continue;
+        }
+        $path = $entity_route->getPath();
+
+        $options = array();
+        if (($bundle_entity_type = $entity_type->getBundleEntityType()) && $bundle_entity_type !== 'bundle') {
+          $options['parameters'][$bundle_entity_type] = array(
+            'type' => 'entity:' . $bundle_entity_type,
+          );
+
+          // Special parameter used to easily recognize all Field UI routes.
+          $options['_field_ui'] = TRUE;
+        }
+
+        $defaults = array(
+          'entity_type_id' => $entity_type_id,
+        );
+        // If the entity type has no bundles and it doesn't use {bundle} in its
+        // admin path, use the entity type.
+        if (strpos($path, '{bundle}') === FALSE) {
+          $defaults['bundle'] = !$entity_type->hasKey('bundle') ? $entity_type_id : '';
+        }
+
+        $route = new Route(
+          "$path/fields/{field_config}",
+          array(
+            '_entity_form' => 'field_config.edit',
+            '_title_callback' => '\Drupal\field_ui\Form\FieldConfigEditForm::getTitle',
+          ) + $defaults,
+          array('_entity_access' => 'field_config.update'),
+          $options
+        );
+        $collection->add("entity.field_config.{$entity_type_id}_field_edit_form", $route);
+
+        $route = new Route(
+          "$path/fields/{field_config}/storage",
+          array('_entity_form' => 'field_storage_config.edit') + $defaults,
+          array('_permission' => 'administer ' . $entity_type_id . ' fields'),
+          $options
+        );
+        $collection->add("entity.field_config.{$entity_type_id}_storage_edit_form", $route);
+
+        $route = new Route(
+          "$path/fields/{field_config}/delete",
+          array('_entity_form' => 'field_config.delete') + $defaults,
+          array('_entity_access' => 'field_config.delete'),
+          $options
+        );
+        $collection->add("entity.field_config.{$entity_type_id}_field_delete_form", $route);
+
+        $route = new Route(
+          "$path/fields",
+          array(
+            '_controller' => '\Drupal\field_ui\Controller\FieldConfigListController::listing',
+            '_title' => 'Manage fields',
+          ) + $defaults,
+          array('_permission' => 'administer ' . $entity_type_id . ' fields'),
+          $options
+        );
+        $collection->add("entity.{$entity_type_id}.field_ui_fields", $route);
+
+        $route = new Route(
+          "$path/fields/add-field",
+          array(
+            '_form' => '\Drupal\field_ui\Form\FieldStorageAddForm',
+            '_title' => 'Add field',
+          ) + $defaults,
+          array('_permission' => 'administer ' . $entity_type_id . ' fields'),
+          $options
+        );
+        $collection->add("field_ui.field_storage_config_add_$entity_type_id", $route);
+
+        $route = new Route(
+          "$path/form-display",
+          array(
+            '_entity_form' => 'entity_form_display.edit',
+            '_title' => 'Manage form display',
+            'form_mode_name' => 'default',
+          ) + $defaults,
+          array('_field_ui_form_mode_access' => 'administer ' . $entity_type_id . ' form display'),
+          $options
+        );
+        $collection->add("entity.entity_form_display.{$entity_type_id}.default", $route);
+
+        $route = new Route(
+          "$path/form-display/{form_mode_name}",
+          array(
+            '_entity_form' => 'entity_form_display.edit',
+            '_title' => 'Manage form display',
+          ) + $defaults,
+          array('_field_ui_form_mode_access' => 'administer ' . $entity_type_id . ' form display'),
+          $options
+        );
+        $collection->add("entity.entity_form_display.{$entity_type_id}.form_mode", $route);
+
+        $route = new Route(
+          "$path/display",
+          array(
+            '_entity_form' => 'entity_view_display.edit',
+            '_title' => 'Manage display',
+            'view_mode_name' => 'default',
+          ) + $defaults,
+          array('_field_ui_view_mode_access' => 'administer ' . $entity_type_id . ' display'),
+          $options
+        );
+        $collection->add("entity.entity_view_display.{$entity_type_id}.default", $route);
+
+        $route = new Route(
+          "$path/display/{view_mode_name}",
+          array(
+            '_entity_form' => 'entity_view_display.edit',
+            '_title' => 'Manage display',
+          ) + $defaults,
+          array('_field_ui_view_mode_access' => 'administer ' . $entity_type_id . ' display'),
+          $options
+        );
+        $collection->add("entity.entity_view_display.{$entity_type_id}.view_mode", $route);
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events = parent::getSubscribedEvents();
+    $events[RoutingEvents::ALTER] = array('onAlterRoutes', -100);
+    return $events;
+  }
+
+}