Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Asset;
Chris@0: 
Chris@0: use Drupal\Component\Utility\Crypt;
Chris@0: 
Chris@0: /**
Chris@0:  * Dumps a CSS or JavaScript asset.
Chris@0:  */
Chris@0: class AssetDumper implements AssetDumperInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    *
Chris@0:    * The file name for the CSS or JS cache file is generated from the hash of
Chris@0:    * the aggregated contents of the files in $data. This forces proxies and
Chris@0:    * browsers to download new CSS when the CSS changes.
Chris@0:    */
Chris@0:   public function dump($data, $file_extension) {
Chris@0:     // Prefix filename to prevent blocking by firewalls which reject files
Chris@0:     // starting with "ad*".
Chris@0:     $filename = $file_extension . '_' . Crypt::hashBase64($data) . '.' . $file_extension;
Chris@0:     // Create the css/ or js/ path within the files folder.
Chris@0:     $path = 'public://' . $file_extension;
Chris@0:     $uri = $path . '/' . $filename;
Chris@0:     // Create the CSS or JS file.
Chris@0:     file_prepare_directory($path, FILE_CREATE_DIRECTORY);
Chris@0:     if (!file_exists($uri) && !file_unmanaged_save_data($data, $uri, FILE_EXISTS_REPLACE)) {
Chris@0:       return FALSE;
Chris@0:     }
Chris@0:     // If CSS/JS gzip compression is enabled and the zlib extension is available
Chris@0:     // then create a gzipped version of this file. This file is served
Chris@0:     // conditionally to browsers that accept gzip using .htaccess rules.
Chris@0:     // It's possible that the rewrite rules in .htaccess aren't working on this
Chris@0:     // server, but there's no harm (other than the time spent generating the
Chris@0:     // file) in generating the file anyway. Sites on servers where rewrite rules
Chris@0:     // aren't working can set css.gzip to FALSE in order to skip
Chris@0:     // generating a file that won't be used.
Chris@0:     if (extension_loaded('zlib') && \Drupal::config('system.performance')->get($file_extension . '.gzip')) {
Chris@0:       if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($data, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
Chris@0:         return FALSE;
Chris@0:       }
Chris@0:     }
Chris@0:     return $uri;
Chris@0:   }
Chris@0: 
Chris@0: }