public function ImageStyleDownloadController::deliver in ImageAPI Optimize WebP 8

Same name and namespace in other branches

1. 2.x src/Controller/ImageStyleDownloadController.php \Drupal\imageapi_optimize_webp\Controller\ImageStyleDownloadController::deliver()

Generates a derivative, given a style and image path.

After generating an image, transfer it to the requesting agent.

Parameters

\Symfony\Component\HttpFoundation\Request $request: The request object.

string $scheme: The file scheme, defaults to 'private'.

\Drupal\image\ImageStyleInterface $image_style: The image style to deliver.

Return value

\Symfony\Component\HttpFoundation\BinaryFileResponse|\Symfony\Component\HttpFoundation\Response The transferred file as response or some error response.

Throws

\Symfony\Component\HttpKernel\Exception\NotFoundHttpException Thrown when the file request is invalid.

\Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException Thrown when the user does not have access to the file.

\Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException Thrown when the file is still being generated.

Overrides ImageStyleDownloadController::deliver

File

src/Controller/ImageStyleDownloadController.php, line 36

Class

ImageStyleDownloadController

Defines a controller to serve image styles.

Namespace

Drupal\imageapi_optimize_webp\Controller

Code

public function deliver(Request $request, $scheme, ImageStyleInterface $image_style) {
  $target = $request->query
    ->get('file');
  $path_info = pathinfo($target);

  // If .webp file, look for image to derive from.
  if ($path_info['extension'] == 'webp') {
    $image_uri = $scheme . '://' . $target;

    // Continue processing if source found, else throw NotFoundHttpException.
    if ($source_uri = $this
      ->lookupSourceImage($image_uri)) {

      // Replace webp image with source image and call parent:deliver().
      $request->query
        ->set('file', str_replace($scheme . '://', '', $source_uri));
      $source_response = parent::deliver($request, $scheme, $image_style);
      $derivative_uri = $image_style
        ->buildUri($image_uri);

      // If parent:deliver() returns BinaryFileResponse, we'll replace
      // the BinaryFileResponse with one containing the .webp image
      // so long as it exists.
      if ($source_response instanceof BinaryFileResponse) {
        if (file_exists($derivative_uri)) {
          $image = $this->imageFactory
            ->get($derivative_uri);
          $uri = $image
            ->getSource();
          $headers = [
            'Content-Type' => 'image/webp',
            'Content-Length' => filesize($image
              ->getToolkit()
              ->getResource()),
          ];
          return new BinaryFileResponse($uri, 200, $headers, $scheme !== 'private');
        }

        // If the derivative does not exist, return a failed reponse.
        return new Response($this
          ->t('Error generating image.'), 500);
      }

      // If we get any response other than BinaryFileResponse,
      // then return the response unchanged.
      return $source_response;
    }
    throw new NotFoundHttpException();
  }
  else {
    return parent::deliver($request, $scheme, $image_style);
  }
}