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