class ImageStyleRoutes

class ImageStyleRoutes implements ContainerInjectionInterface {
  
  /**
   * The stream wrapper manager service.
   *
   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface
   */
  protected $streamWrapperManager;
  
  /**
   * Constructs a new ImageStyleRoutes object.
   *
   * @param \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface $stream_wrapper_manager
   *   The stream wrapper manager service.
   */
  public function __construct(StreamWrapperManagerInterface $stream_wrapper_manager) {
    $this->streamWrapperManager = $stream_wrapper_manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('stream_wrapper_manager'));
  }
  
  /**
   * Returns an array of route objects.
   *
   * @return \Symfony\Component\Routing\Route[]
   *   An array of route objects.
   */
  public function routes() {
    $routes = [];
    // Generate image derivatives of publicly available files. If clean URLs are
    // disabled image derivatives will always be served through the menu system.
    // If clean URLs are enabled and the image derivative already exists, PHP
    // will be bypassed.
    $directory_path = $this->streamWrapperManager
      ->getViaScheme('public')
      ->getDirectoryPath();
    $routes['image.style_public'] = new Route('/' . $directory_path . '/styles/{image_style}/{scheme}', [
      '_controller' => 'Drupal\\image\\Controller\\ImageStyleDownloadController::deliver',
      'required_derivative_scheme' => 'public',
    ], [
      '_access' => 'TRUE',
    ]);
    return $routes;
  }

}