LinkFieldSerializer.php in Acquia Content Hub 8.2

Namespace

Drupal\acquia_contenthub\EventSubscriber\SerializeContentField

File

src/EventSubscriber/SerializeContentField/LinkFieldSerializer.php

<?php

namespace Drupal\acquia_contenthub\EventSubscriber\SerializeContentField;

use Drupal\acquia_contenthub\AcquiaContentHubEvents;
use Drupal\acquia_contenthub\Event\SerializeCdfEntityFieldEvent;
use Drupal\Core\Entity\ContentEntityInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Link Field Serializer.
 *
 * This class handles the serialization of menu_link entities.
 *
 * @package Drupal\acquia_contenthub\EventSubscriber\SerializeContentField
 */
class LinkFieldSerializer implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events[AcquiaContentHubEvents::SERIALIZE_CONTENT_ENTITY_FIELD][] = [
      'onSerializeContentField',
      15,
    ];
    return $events;
  }

  /**
   * On serialize content field event function.
   *
   * Extracts entity uuids from link fields and serializes them.
   *
   * @param \Drupal\acquia_contenthub\Event\SerializeCdfEntityFieldEvent $event
   *   The content entity field serialization event.
   *
   * @throws \Exception
   */
  public function onSerializeContentField(SerializeCdfEntityFieldEvent $event) {

    // Return if the type of field is not a link.
    if ($event
      ->getField()
      ->getFieldDefinition()
      ->getType() !== 'link') {
      return;
    }

    // Get main entity.
    $entity = $event
      ->getEntity();

    // Confirm the entity is an instance of ContentEntityInterface.
    if (!$entity instanceof ContentEntityInterface) {
      return;
    }
    $field_translations = $this
      ->getFieldTranslations($entity, $event);
    if (!$field_translations) {
      return;
    }
    $cdf = $event
      ->getCdf();
    $metadata = $cdf
      ->getMetadata();

    // Init data arr.
    $data = [];

    // Loop through field translations.
    foreach ($field_translations as $field) {
      $langcode = $field
        ->getLangcode();

      // Set type in meta data.
      $metadata['field'][$event
        ->getFieldName()] = [
        'type' => $event
          ->getField()
          ->getFieldDefinition()
          ->getType(),
      ];

      // Set the translation value to represent null field data.
      if (empty(count($field))) {
        $data['value'][$langcode][] = NULL;
        continue;
      }

      // Loop through fields to get link values to serialize.

      /** @var \Drupal\link\Plugin\Field\FieldType\LinkItem $item */
      foreach ($field as $item) {

        // Get values.
        $values = $item
          ->getValue();

        // If values are empty, continue to next menu_link item.
        if (empty($values['uri'])) {
          continue;
        }

        // Explode the uri first by a colon to retrieve the link type.
        list($uri_type, $uri_reference) = explode(':', $values['uri'], 2);

        // Set uri type in meta data.
        $values['uri_type'] = $item
          ->isExternal() ? 'external' : $uri_type;
        if ($uri_type === 'entity') {

          // Explode entity to get the type and id.
          list($entity_type, $entity_id) = explode('/', $uri_reference, 2);

          // Load the entity to be added as a dependency.
          $uri_entity = \Drupal::entityTypeManager()
            ->getStorage($entity_type)
            ->load($entity_id);

          // If the entity is missing, skip this field.
          if (is_null($uri_entity)) {
            continue;
          }

          // Place the entity's uuid into the value position.
          $values['uri'] = $uri_entity
            ->uuid();
        }
        elseif ($uri_type === 'internal') {
          $url = $item
            ->getUrl();
          if ($url && $url
            ->isRouted()) {
            $route_params = $url
              ->getRouteParameters();
            if (!empty($route_params)) {
              try {
                $uri_storage = \Drupal::entityTypeManager()
                  ->getStorage(key($route_params));
              } catch (\Exception $e) {
                $uri_storage = NULL;
              }
              $uri_entity = !is_null($uri_storage) ? $uri_storage
                ->load(current($route_params)) : NULL;
              if (is_null($uri_entity)) {
                continue;
              }
              $internal_path = $url
                ->getInternalPath();

              // This only needs to be done in case internal link is
              // internal:/<ENT_TYPE>/<ENT_ID>. Not required for path aliases
              // and internal routes.
              if ($internal_path === ltrim($uri_reference, '/')) {
                $values['internal_type'] = 'internal_entity';
                $values['uri'] = $uri_entity
                  ->uuid();
              }
            }
          }
        }
        $data['value'][$langcode][] = $values;
      }
    }

    // Set data before continuing.
    $event
      ->setFieldData($data);

    // Set the meta data.
    $cdf
      ->setMetadata($metadata);

    // Stop event propagation.
    $event
      ->stopPropagation();
  }

  /**
   * Extracts all translations of field.
   *
   * @param \Drupal\Core\Entity\ContentEntityInterface $entity
   *   Entity.
   * @param \Drupal\acquia_contenthub\Event\SerializeCdfEntityFieldEvent $event
   *   The content entity field serialization event.
   *
   * @return \Drupal\Core\Field\FieldItemListInterface[]
   *   List of fields.
   */
  protected function getFieldTranslations(ContentEntityInterface $entity, SerializeCdfEntityFieldEvent $event) {
    $fields = [];
    $languages = $entity
      ->getTranslationLanguages();
    $field = $event
      ->getField();
    if ($field
      ->getFieldDefinition()
      ->isTranslatable()) {
      foreach ($languages as $language) {
        $translated = $entity
          ->getTranslation($language
          ->getId());
        $fields[] = $translated
          ->get($event
          ->getFieldName());
      }
    }
    else {
      $fields[] = $field;
    }
    return $fields;
  }

}

Classes

Name	Description
LinkFieldSerializer	Link Field Serializer.