diff core/modules/rest/src/Plugin/ResourceBase.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/rest/src/Plugin/ResourceBase.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,240 @@
+<?php
+
+namespace Drupal\rest\Plugin;
+
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Plugin\PluginBase;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * Common base class for resource plugins.
+ *
+ * Note that this base class' implementation of the permissions() method
+ * generates a permission for every method for a resource. If your resource
+ * already has its own access control mechanism, you should opt out from this
+ * default permissions() method by overriding it.
+ *
+ * @see \Drupal\rest\Annotation\RestResource
+ * @see \Drupal\rest\Plugin\Type\ResourcePluginManager
+ * @see \Drupal\rest\Plugin\ResourceInterface
+ * @see plugin_api
+ *
+ * @ingroup third_party
+ */
+abstract class ResourceBase extends PluginBase implements ContainerFactoryPluginInterface, ResourceInterface {
+
+  /**
+   * The available serialization formats.
+   *
+   * @var array
+   */
+  protected $serializerFormats = [];
+
+  /**
+   * A logger instance.
+   *
+   * @var \Psr\Log\LoggerInterface
+   */
+  protected $logger;
+
+  /**
+   * Constructs a Drupal\rest\Plugin\ResourceBase object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param array $serializer_formats
+   *   The available serialization formats.
+   * @param \Psr\Log\LoggerInterface $logger
+   *   A logger instance.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, array $serializer_formats, LoggerInterface $logger) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->serializerFormats = $serializer_formats;
+    $this->logger = $logger;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->getParameter('serializer.formats'),
+      $container->get('logger.factory')->get('rest')
+    );
+  }
+
+  /**
+   * Implements ResourceInterface::permissions().
+   *
+   * Every plugin operation method gets its own user permission. Example:
+   * "restful delete entity:node" with the title "Access DELETE on Node
+   * resource".
+   */
+  public function permissions() {
+    $permissions = [];
+    $definition = $this->getPluginDefinition();
+    foreach ($this->availableMethods() as $method) {
+      $lowered_method = strtolower($method);
+      $permissions["restful $lowered_method $this->pluginId"] = [
+        'title' => $this->t('Access @method on %label resource', ['@method' => $method, '%label' => $definition['label']]),
+      ];
+    }
+    return $permissions;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function routes() {
+    $collection = new RouteCollection();
+
+    $definition = $this->getPluginDefinition();
+    $canonical_path = isset($definition['uri_paths']['canonical']) ? $definition['uri_paths']['canonical'] : '/' . strtr($this->pluginId, ':', '/') . '/{id}';
+    $create_path = isset($definition['uri_paths']['create']) ? $definition['uri_paths']['create'] : '/' . strtr($this->pluginId, ':', '/');
+    // BC: the REST module originally created the POST URL for a resource by
+    // reading the 'https://www.drupal.org/link-relations/create' URI path from
+    // the plugin annotation. For consistency with entity type definitions, that
+    // then changed to reading the 'create' URI path. For any REST Resource
+    // plugins that were using the old mechanism, we continue to support that.
+    if (!isset($definition['uri_paths']['create']) && isset($definition['uri_paths']['https://www.drupal.org/link-relations/create'])) {
+      $create_path = $definition['uri_paths']['https://www.drupal.org/link-relations/create'];
+    }
+
+    $route_name = strtr($this->pluginId, ':', '.');
+
+    $methods = $this->availableMethods();
+    foreach ($methods as $method) {
+      $route = $this->getBaseRoute($canonical_path, $method);
+
+      switch ($method) {
+        case 'POST':
+          $route->setPath($create_path);
+          $collection->add("$route_name.$method", $route);
+          break;
+
+        case 'GET':
+        case 'HEAD':
+          // Restrict GET and HEAD requests to the media type specified in the
+          // HTTP Accept headers.
+          foreach ($this->serializerFormats as $format_name) {
+            // Expose one route per available format.
+            $format_route = clone $route;
+            $format_route->addRequirements(['_format' => $format_name]);
+            $collection->add("$route_name.$method.$format_name", $format_route);
+          }
+          break;
+
+        default:
+          $collection->add("$route_name.$method", $route);
+          break;
+      }
+    }
+
+    return $collection;
+  }
+
+  /**
+   * Provides predefined HTTP request methods.
+   *
+   * Plugins can override this method to provide additional custom request
+   * methods.
+   *
+   * @return array
+   *   The list of allowed HTTP request method strings.
+   */
+  protected function requestMethods() {
+    return [
+      'HEAD',
+      'GET',
+      'POST',
+      'PUT',
+      'DELETE',
+      'TRACE',
+      'OPTIONS',
+      'CONNECT',
+      'PATCH',
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function availableMethods() {
+    $methods = $this->requestMethods();
+    $available = [];
+    foreach ($methods as $method) {
+      // Only expose methods where the HTTP request method exists on the plugin.
+      if (method_exists($this, strtolower($method))) {
+        $available[] = $method;
+      }
+    }
+    return $available;
+  }
+
+  /**
+   * Gets the base route for a particular method.
+   *
+   * @param string $canonical_path
+   *   The canonical path for the resource.
+   * @param string $method
+   *   The HTTP method to be used for the route.
+   *
+   * @return \Symfony\Component\Routing\Route
+   *   The created base route.
+   */
+  protected function getBaseRoute($canonical_path, $method) {
+    return new Route($canonical_path, [
+      '_controller' => 'Drupal\rest\RequestHandler::handle',
+    ],
+      $this->getBaseRouteRequirements($method),
+      [],
+      '',
+      [],
+      // The HTTP method is a requirement for this route.
+      [$method]
+    );
+  }
+
+  /**
+   * Gets the base route requirements for a particular method.
+   *
+   * @param $method
+   *   The HTTP method to be used for the route.
+   *
+   * @return array
+   *   An array of requirements for parameters.
+   */
+  protected function getBaseRouteRequirements($method) {
+    $lower_method = strtolower($method);
+    // Every route MUST have requirements that result in the access manager
+    // having access checks to check. If it does not, the route is made
+    // inaccessible. So, we default to granting access to everyone. If a
+    // permission exists, then we add that below. The access manager requires
+    // that ALL access checks must grant access, so this still results in
+    // correct behavior.
+    $requirements = [
+      '_access' => 'TRUE',
+    ];
+
+    // Only specify route requirements if the default permission exists. For any
+    // more advanced route definition, resource plugins extending this base
+    // class must override this method.
+    $permission = "restful $lower_method $this->pluginId";
+    if (isset($this->permissions()[$permission])) {
+      $requirements['_permission'] = $permission;
+    }
+
+    return $requirements;
+  }
+
+}