media_entity_twitter.module

<?php

/**
 * @file
 * Hook implementations for media_entity_twitter module.
 */

/**
 * Implements hook_theme().
 */
function media_entity_twitter_theme() {
  return [
    'media_entity_twitter_tweet' => [
      'variables' => ['path' => NULL, 'attributes' => []],
    ],
    'media_entity_twitter_tweet_thumbnail' => [
      'variables' => [
        'content' => '',
        'author' => '',
        'avatar' => NULL,
      ],
    ],
  ];
}

/**
 * Preprocess function for media_entity_twitter_tweet_thumbnail theme hook.
 *
 * @param array $variables
 *   Variables to be injected into the template.
 */
function media_entity_twitter_preprocess_media_entity_twitter_tweet_thumbnail(array &$variables) {
  // If the avatar exists, load it directly into memory and base64 encode it.
  // For security reasons, browsers don't always allow external images xlinked
  // in an SVG to be displayed when the SVG is being embedded via an <img> tag.
  // The workaround is to embed the image directly into the SVG as a base64
  // encoded string.
  if ($variables['avatar']) {
    $extension = pathinfo($variables['avatar'], PATHINFO_EXTENSION);
    $extension = strtolower($extension);

    // Don't fetch the avatar if it has an unrecognized extension.
    if (in_array($extension, ['gif', 'jpg', 'jpeg', 'png', 'webp'])) {
      $data = file_get_contents($variables['avatar']);

      if ($data) {
        // image/jpg is not a thing.
        if ($extension == 'jpg') {
          $extension = 'jpeg';
        }
        $variables['avatar'] = 'data:image/' . $extension . ';base64,' . base64_encode($data);
      }
      else {
        unset($variables['avatar']);
      }
    }
    else {
      unset($variables['avatar']);
    }
  }
}