function FileUrlGenerator::transformRelative

File

core/lib/Drupal/Core/File/FileUrlGenerator.php, line 208

Class

FileUrlGenerator

Default implementation for the file URL generator service.

Namespace

Code

public function transformRelative(string $file_url, bool $root_relative = TRUE) : string {
  // Unfortunately, we pretty much have to duplicate Symfony's
  // Request::getHttpHost() method because Request::getPort() may return NULL
  // instead of a port number.
  $request = $this->requestStack
    ->getCurrentRequest();
  $host = $request->getHost();
  $scheme = $request->getScheme();
  $port = $request->getPort() ?: 80;
  // Files may be accessible on a different port than the web request.
  $file_url_port = parse_url($file_url, PHP_URL_PORT) ?? $port;
  if ($file_url_port != $port) {
    return $file_url;
  }
  if ('http' == $scheme && $port == 80 || 'https' == $scheme && $port == 443) {
    $http_host = $host;
  }
  else {
    $http_host = $host . ':' . $port;
  }
  // If this should not be a root-relative path but relative to the drupal
  // base path, add it to the host to be removed from the URL as well.
  if (!$root_relative) {
    $http_host .= $request->getBasePath();
  }
  return preg_replace('|^https?://' . preg_quote($http_host, '|') . '|', '', $file_url);
}