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();
    $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 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.
    $base_path = !$root_relative ? $request->getBasePath() : '';
    $host = preg_quote($host, '@');
    $port = preg_quote($port, '@');
    $base_path = preg_quote($base_path, '@');
    return preg_replace("@^https?://{$host}(:{$port})?{$base_path}(\$|/)@", '/', $file_url);
}