From b00d179928d08ee3ae04b68140985568826504cb Mon Sep 17 00:00:00 2001
From: florenttorregrosa <florenttorregrosa@2388214.no-reply.drupal.org>
Date: Fri, 2 Jun 2017 15:58:16 +0200
Subject: [PATCH] Issue #2883437 by Grimreaper: Transform link field value to
 use UUID

---
 src/Plugin/ResourceFieldEnhancerBase.php           | 28 ++++++++
 .../jsonapi/FieldEnhancer/LinkFieldEnhancer.php    | 75 ++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 src/Plugin/jsonapi/FieldEnhancer/LinkFieldEnhancer.php

diff --git a/src/Plugin/ResourceFieldEnhancerBase.php b/src/Plugin/ResourceFieldEnhancerBase.php
index 1fa7683..3034e07 100644
--- a/src/Plugin/ResourceFieldEnhancerBase.php
+++ b/src/Plugin/ResourceFieldEnhancerBase.php
@@ -26,6 +26,13 @@ abstract class ResourceFieldEnhancerBase extends PluginBase implements ResourceF
   /**
    * {@inheritdoc}
    */
+  public function defaultConfiguration() {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function calculateDependencies() {
     // TODO: This should have a dependency on the resource_config entity.
     return [];
@@ -43,9 +50,30 @@ abstract class ResourceFieldEnhancerBase extends PluginBase implements ResourceF
   /**
    * {@inheritdoc}
    */
+  public function postProcess($value) {
+    return $value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function prepareForInput($value) {
+    return $value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function setConfiguration(array $configuration) {
     $this->configuration = $configuration + $this->defaultConfiguration();
     return $this->configuration;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getSettingsForm(array $resource_field_info) {
+    return [];
+  }
+
 }
diff --git a/src/Plugin/jsonapi/FieldEnhancer/LinkFieldEnhancer.php b/src/Plugin/jsonapi/FieldEnhancer/LinkFieldEnhancer.php
new file mode 100644
index 0000000..72c476d
--- /dev/null
+++ b/src/Plugin/jsonapi/FieldEnhancer/LinkFieldEnhancer.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\jsonapi_extras\Plugin\jsonapi\FieldEnhancer;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\jsonapi_extras\Plugin\ResourceFieldEnhancerBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Perform additional manipulations to link fields.
+ *
+ * @ResourceFieldEnhancer(
+ *   id = "link_field",
+ *   label = @Translation("Link field"),
+ *   description = @Translation("Use UUID for internal link field.")
+ * )
+ */
+class LinkFieldEnhancer extends ResourceFieldEnhancerBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, array $plugin_definition, EntityTypeManagerInterface $entity_type_manager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function postProcess($value) {
+    if (isset($value['uri'])) {
+      // Check if it is a link to an entity.
+      preg_match("/entity:(.*)\/(.*)/", $value['uri'], $parsed_uri);
+      if (!empty($parsed_uri)) {
+        $entity_type = $parsed_uri[1];
+        $entity_id = $parsed_uri[2];
+        $entity = $this->entityTypeManager->getStorage($entity_type)->load($entity_id);
+        $value['uri'] = 'entity:' . $entity_type . '/' . $entity->uuid();
+      }
+    }
+
+    return $value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getJsonSchema() {
+    return [
+      'type' => 'array',
+    ];
+  }
+
+}
-- 
1.9.1