Current user data producer. (#912)

Author: rthideaway

src/Plugin/GraphQL/DataProducer/User/CurrentUser.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\graphql\Plugin\GraphQL\DataProducer\User;
+
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\graphql\GraphQL\Execution\FieldContext;
+use Drupal\graphql\Plugin\GraphQL\DataProducer\DataProducerPluginBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Gets the current user.
+ *
+ * @DataProducer(
+ *   id = "current_user",
+ *   name = @Translation("Current user"),
+ *   description = @Translation("Current logged in user."),
+ *   produces = @ContextDefinition("any",
+ *     label = @Translation("Current user")
+ *   )
+ * )
+ */
+class CurrentUser extends DataProducerPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $currentUser;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('current_user')
+    );
+  }
+
+  /**
+   * CurrentUser constructor.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param array $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Session\AccountInterface $current_user
+   *   The current user.
+   */
+  public function __construct(array $configuration, string $plugin_id, array $plugin_definition, AccountInterface $current_user) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->currentUser = $current_user;
+  }
+
+  /**
+   * Returns current user.
+   *
+   * @param \Drupal\graphql\GraphQL\Execution\FieldContext $field_context
+   *   Field context.
+   *
+   * @return \Drupal\Core\Session\AccountInterface
+   *   The current user.
+   */
+  public function resolve(FieldContext $field_context): AccountInterface {
+    // Response must be cached based on current user as a cache context,
+    // otherwise a new user would became a previous user.
+    $field_context->addCacheableDependency($this->currentUser);
+    return $this->currentUser;
+  }
+
+}