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

core/modules/rest/src/RestPermissions.php

@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\rest\RestPermissions.
+ */
+
+namespace Drupal\rest;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\rest\Plugin\Type\ResourcePluginManager;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides rest module permissions.
+ */
+class RestPermissions implements ContainerInjectionInterface {
+
+  /**
+   * The rest resource plugin manager.
+   *
+   * @var \Drupal\rest\Plugin\Type\ResourcePluginManager
+   */
+  protected $restPluginManager;
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs a new RestPermissions instance.
+   *
+   * @param \Drupal\rest\Plugin\Type\ResourcePluginManager $rest_plugin_manager
+   *   The rest resource plugin manager.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory.
+   */
+  public function __construct(ResourcePluginManager $rest_plugin_manager, ConfigFactoryInterface $config_factory) {
+    $this->restPluginManager = $rest_plugin_manager;
+    $this->configFactory = $config_factory;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static($container->get('plugin.manager.rest'), $container->get('config.factory'));
+  }
+
+  /**
+   * Returns an array of REST permissions.
+   *
+   * @return array
+   */
+  public function permissions() {
+    $permissions = [];
+    $resources = $this->configFactory->get('rest.settings')->get('resources');
+    if ($resources && $enabled = array_intersect_key($this->restPluginManager->getDefinitions(), $resources)) {
+      foreach ($enabled as $key => $resource) {
+        $plugin = $this->restPluginManager->getInstance(['id' => $key]);
+        $permissions = array_merge($permissions, $plugin->permissions());
+      }
+    }
+    return $permissions;
+  }
+
+}