protected function ImageStyleGenerationTrait::generateImageStyle in Flysystem 8

Same name and namespace in other branches

1. 3.x src/Plugin/ImageStyleGenerationTrait.php \Drupal\flysystem\Plugin\ImageStyleGenerationTrait::generateImageStyle()
2. 2.0.x src/Plugin/ImageStyleGenerationTrait.php \Drupal\flysystem\Plugin\ImageStyleGenerationTrait::generateImageStyle()
3. 3.0.x src/Plugin/ImageStyleGenerationTrait.php \Drupal\flysystem\Plugin\ImageStyleGenerationTrait::generateImageStyle()

Generates an image style for a file target.

Parameters

string $target: The file target.

Return value

bool True on success, false on failure.

File

src/Plugin/ImageStyleGenerationTrait.php, line 22

Class

ImageStyleGenerationTrait

Helper trait for generating URLs from adapter plugins.

Namespace

Drupal\flysystem\Plugin

Code

protected function generateImageStyle($target) {
  if (strpos($target, 'styles/') !== 0 || substr_count($target, '/') < 3) {
    return FALSE;
  }
  list(, $style, $scheme, $file) = explode('/', $target, 4);
  if (!($image_style = ImageStyle::load($style))) {
    return FALSE;
  }
  $image_uri = $scheme . '://' . $file;
  $derivative_uri = $image_style
    ->buildUri($image_uri);
  if (!file_exists($image_uri)) {
    $path_info = pathinfo($image_uri);
    $converted_image_uri = $path_info['dirname'] . '/' . $path_info['filename'];
    if (!file_exists($converted_image_uri)) {
      return FALSE;
    }
    else {

      // The converted file does exist, use it as the source.
      $image_uri = $converted_image_uri;
    }
  }
  $lock_name = 'image_style_deliver:' . $image_style
    ->id() . ':' . Crypt::hashBase64($image_uri);
  if (!file_exists($derivative_uri)) {
    $lock_acquired = \Drupal::lock()
      ->acquire($lock_name);
    if (!$lock_acquired) {
      return FALSE;
    }
  }
  $success = file_exists($derivative_uri) || $image_style
    ->createDerivative($image_uri, $derivative_uri);
  if (!empty($lock_acquired)) {
    \Drupal::lock()
      ->release($lock_name);
  }
  return $success;
}