file_tokens

file_tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata)

function file_tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {
  $token_service = \Drupal::token();

  $url_options = array('absolute' => TRUE);
  if (isset($options['langcode'])) {
    $url_options['language'] = \Drupal::languageManager()->getLanguage($options['langcode']);
    $langcode = $options['langcode'];
  }
  else {
    $langcode = NULL;
  }

  $replacements = array();

  if ($type == 'file' && !empty($data['file'])) {
    /** @var \Drupal\file\FileInterface $file */
    $file = $data['file'];

    foreach ($tokens as $name => $original) {
      switch ($name) {
        // Basic keys and values.
        case 'fid':
          $replacements[$original] = $file->id();
          break;

          // Essential file data
        case 'name':
          $replacements[$original] = $file->getFilename();
          break;

        case 'path':
          $replacements[$original] = $file->getFileUri();
          break;

        case 'mime':
          $replacements[$original] = $file->getMimeType();
          break;

        case 'size':
          $replacements[$original] = format_size($file->getSize());
          break;

        case 'url':
          // Ideally, this would use file_url_transform_relative(), but because
          // tokens are also often used in e-mails, it's better to keep absolute
          // file URLs. The 'url.site' cache context is associated to ensure the
          // correct absolute URL is used in case of a multisite setup.
          $replacements[$original] = file_create_url($file->getFileUri());
          $bubbleable_metadata->addCacheContexts(['url.site']);
          break;

          // These tokens are default variations on the chained tokens handled below.
        case 'created':
          $date_format = DateFormat::load('medium');
          $bubbleable_metadata->addCacheableDependency($date_format);
          $replacements[$original] = format_date($file->getCreatedTime(), 'medium', '', NULL, $langcode);
          break;

        case 'changed':
          $date_format = DateFormat::load('medium');
          $bubbleable_metadata = $bubbleable_metadata->addCacheableDependency($date_format);
          $replacements[$original] = format_date($file->getChangedTime(), 'medium', '', NULL, $langcode);
          break;

        case 'owner':
          $owner = $file->getOwner();
          $bubbleable_metadata->addCacheableDependency($owner);
          $name = $owner->label();
          $replacements[$original] = $name;
          break;
      }
    }

    if ($date_tokens = $token_service->findWithPrefix($tokens, 'created')) {
      $replacements += $token_service->generate('date', $date_tokens, array('date' => $file->getCreatedTime()), $options, $bubbleable_metadata);
    }

    if ($date_tokens = $token_service->findWithPrefix($tokens, 'changed')) {
      $replacements += $token_service->generate('date', $date_tokens, array('date' => $file->getChangedTime()), $options, $bubbleable_metadata);
    }

    if (($owner_tokens = $token_service->findWithPrefix($tokens, 'owner')) && $file->getOwner()) {
      $replacements += $token_service->generate('user', $owner_tokens, array('user' => $file->getOwner()), $options, $bubbleable_metadata);
    }
  }

  return $replacements;
}