Facebook.php in Media entity facebook 8

Namespace

Drupal\media_entity_facebook\Plugin\MediaEntity\Type

File

src/Plugin/MediaEntity/Type/Facebook.php

<?php

namespace Drupal\media_entity_facebook\Plugin\MediaEntity\Type;

use Drupal\Core\Form\FormStateInterface;
use Drupal\media_entity\MediaInterface;
use Drupal\media_entity\MediaTypeBase;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Entity\EntityFieldManagerInterface;
use Drupal\Core\Config\Config;
use Drupal\media_entity_facebook\FacebookFetcher;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides media type plugin for Facebook.
 *
 * @MediaType(
 *   id = "facebook",
 *   label = @Translation("Facebook"),
 *   description = @Translation("Provides business logic and metadata for Facebook.")
 * )
 *
 * @todo On the long run we could switch to the facebook API which provides WAY
 *   more fields.
 */
class Facebook extends MediaTypeBase {

  /**
   * Facebook Fetcher.
   *
   * @var \Drupal\media_entity_facebook\FacebookFetcher
   */
  protected $facebookFetcher;

  /**
   * Facebook 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 mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   Entity type manager service.
   * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
   *   Entity field manager service.
   * @param \Drupal\Core\Config\Config $config
   *   Media entity config object.
   * @param \Drupal\media_entity_facebook\FacebookFetcher $facebook_fetcher
   *   The Facebook Fetcher.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, EntityFieldManagerInterface $entity_field_manager, Config $config, FacebookFetcher $facebook_fetcher) {
    parent::__construct($configuration, $plugin_id, $plugin_definition, $entity_type_manager, $entity_field_manager, $config);
    $this->facebookFetcher = $facebook_fetcher;
  }

  /**
   * {@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'), $container
      ->get('entity_field.manager'), $container
      ->get('config.factory')
      ->get('media_entity.settings'), $container
      ->get('media_entity_facebook.facebook_fetcher'));
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'source_field' => '',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form = [];
    $options = [];
    $bundle = $form_state
      ->getFormObject()
      ->getEntity();
    $allowed_field_types = [
      'string',
      'string_long',
      'link',
    ];
    foreach ($this->entityFieldManager
      ->getFieldDefinitions('media', $bundle
      ->id()) as $field_name => $field) {
      if (in_array($field
        ->getType(), $allowed_field_types) && !$field
        ->getFieldStorageDefinition()
        ->isBaseField()) {
        $options[$field_name] = $field
          ->getLabel();
      }
    }
    $form['source_field'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Field with source information'),
      '#description' => $this
        ->t('Field on media entity that stores facebook embed code or URL. You can create a bundle without selecting a value for this dropdown initially. This dropdown can be populated after adding fields to the bundle.'),
      '#default_value' => empty($this->configuration['source_field']) ? NULL : $this->configuration['source_field'],
      '#options' => $options,
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function providedFields() {
    return [
      'author_name',
      'width',
      'height',
      'url',
      'html',
    ];
  }

  /**
   * Runs preg_match on embed code/URL.
   *
   * @param MediaInterface $media
   *   Media object.
   *
   * @return string|false
   *   The facebook url or FALSE if there is no field or it contains invalid
   *   data.
   */
  protected function getFacebookUrl(MediaInterface $media) {
    if (isset($this->configuration['source_field'])) {
      $source_field = $this->configuration['source_field'];
      if ($media
        ->hasField($source_field)) {
        $property_name = $media->{$source_field}
          ->first()
          ->mainPropertyName();
        $embed = $media->{$source_field}->{$property_name};
        return static::parseFacebookEmbedField($embed);
      }
    }
    return FALSE;
  }

  /**
   * Extract a Facebook content URL from a string.
   *
   * Typically users will enter an iframe embed code that Facebook provides, so
   * which needs to be parsed to extract the actual post URL.
   *
   * Users may also enter the actual content URL - in which case we just return
   * the value if it matches our expected format.
   *
   * @param string $data
   *   The string that contains the Facebook post URL.
   *
   * @return string|bool
   *   The post URL, or FALSE if one cannot be found.
   */
  public static function parseFacebookEmbedField($data) {
    $data = trim($data);

    // Ideally we would verify that the content URL matches an exact pattern,
    // but Facebook has a ton of different ways posts/notes/videos/etc URLs can
    // be formatted, so it's not practical to try and validate them. Instead,
    // just validate that the content URL is from the facebook domain.
    $content_url_regex = '/^https:\\/\\/(www\\.)?facebook\\.com\\//i';
    if (preg_match($content_url_regex, $data)) {
      return $data;
    }
    else {

      // Check if the user entered an iframe embed instead, and if so,
      // extract the post URL from the iframe src.
      $doc = new \DOMDocument();
      if (@$doc
        ->loadHTML($data)) {
        $iframes = $doc
          ->getElementsByTagName('iframe');
        if ($iframes->length > 0 && $iframes
          ->item(0)
          ->hasAttribute('src')) {
          $iframe_src = $iframes
            ->item(0)
            ->getAttribute('src');
          $uri_parts = parse_url($iframe_src);
          if ($uri_parts !== FALSE && isset($uri_parts['query'])) {
            parse_str($uri_parts['query'], $query_params);
            if (isset($query_params['href']) && preg_match($content_url_regex, $query_params['href'])) {
              return $query_params['href'];
            }
          }
        }
      }
    }
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function getField(MediaInterface $media, $name) {
    $content_url = $this
      ->getFacebookUrl($media);
    if ($content_url === FALSE) {
      return FALSE;
    }
    $data = $this->facebookFetcher
      ->getOembedData($content_url);
    if ($data === FALSE) {
      return FALSE;
    }
    switch ($name) {
      case 'author_name':
        return $data['author_name'];
      case 'width':
        return $data['width'];
      case 'height':
        return $data['height'];
      case 'url':
        return $data['url'];
      case 'html':
        return $data['html'];
    }
  }

  /**
   * {@inheritdoc}
   */
  public function thumbnail(MediaInterface $media) {

    // @todo Add support for thumbnails on the longrun.
    return $this
      ->getDefaultThumbnail();
  }

  /**
   * {@inheritdoc}
   */
  public function getDefaultThumbnail() {
    return $this->config
      ->get('icon_base') . '/facebook.png';
  }

  /**
   * {@inheritdoc}
   */
  public function attachConstraints(MediaInterface $media) {
    parent::attachConstraints($media);
    if (isset($this->configuration['source_field'])) {
      $source_field_name = $this->configuration['source_field'];
      if ($media
        ->hasField($source_field_name)) {
        foreach ($media
          ->get($source_field_name) as &$embed_code) {

          /** @var \Drupal\Core\TypedData\DataDefinitionInterface $typed_data */
          $typed_data = $embed_code
            ->getDataDefinition();
          $typed_data
            ->addConstraint('FacebookEmbedCode');
        }
      }
    }
  }

}

Classes

Name	Description
Facebook	Provides media type plugin for Facebook.