Metatag controller

Author: Bertrand KHE

Diff for: itc_jsonapi.routing.yml

@@ -69,3 +69,10 @@ itc_jsonapi.auth_controller.token:
     _access: 'TRUE'
   options:
     _no_cache: TRUE
+itc_jsonapi.metatag_controller.metatag:
+  path: '/jsonapi/metatag'
+  defaults:
+    _controller: '\Drupal\itc_jsonapi\Controller\MetatagController:metatag'
+    _title: 'Get metatag'
+  requirements:
+    _access: 'TRUE'

Diff for: src/Controller/MetatagController.php

@@ -0,0 +1,68 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: bertrand
+ * Date: 03/12/18
+ * Time: 10:10
+ */
+
+namespace Drupal\itc_jsonapi\Controller;
+
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\itc_jsonapi\CacheableJsonApiResponse;
+use Drupal\itc_jsonapi\JsonApiResponse;
+use Symfony\Component\HttpFoundation\Request;
+
+class MetatagController {
+
+  const ALLOWED_ENTITY_TYPES = ['node', 'taxonomy_term'];
+
+  /**
+   * @var \Drupal\Core\Entity\EntityRepositoryInterface
+   */
+  protected $entityRepository;
+
+  /**
+   * @var \Drupal\metatag\MetatagManagerInterface
+   */
+  protected $metatagManager;
+
+  public function __construct() {
+    $this->entityRepository = \Drupal::service('entity.repository');
+    $this->languageManager = \Drupal::languageManager();
+    $this->metatagManager = \Drupal::service('metatag.manager');
+  }
+
+  public function metatag(Request $request) {
+    $entity_type = $request->query->get('entity_type');
+    $uuid = $request->query->get('id');
+    if (!in_array($entity_type, self::ALLOWED_ENTITY_TYPES)) {
+      return new JsonApiResponse();
+    }
+    if (!is_string($uuid)) {
+      return new JsonApiResponse();
+    }
+    /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
+    $entity = $this->entityRepository->loadEntityByUuid($entity_type, $uuid);
+    if (empty($entity)) {
+      return new JsonApiResponse();
+    }
+    $language = $this->languageManager->getCurrentLanguage(LanguageInterface::TYPE_CONTENT);
+    $langcode = $language->getId();
+    if ($entity->hasTranslation($langcode)) {
+      $entity = $entity->getTranslation($langcode);
+    }
+    $tags = $this->metatagManager->tagsFromEntityWithDefaults($entity);
+    $metatags = $this->metatagManager->generateElements($tags, $entity)['#attached']['html_head'];
+    $data = [
+      'data' => [],
+    ];
+    foreach ($metatags as $tag) {
+      $data['data'][] = $tag[0];
+    }
+    $response = new JsonApiResponse(json_encode($data));
+    return $response;
+  }
+}