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<?php
namespace Drupal\Core\Asset;
use Drupal\Component\Utility\Crypt;
use Drupal\Core\File\Exception\FileException;
use Drupal\Core\File\FileExists;
use Drupal\Core\File\FileSystemInterface;
/**
* Dumps a CSS or JavaScript asset.
*/
class AssetDumper implements AssetDumperUriInterface {
/**
* The file system service.
*
* @var \Drupal\Core\File\FileSystemInterface
*/
protected $fileSystem;
/**
* AssetDumper constructor.
*
* @param \Drupal\Core\File\FileSystemInterface $file_system
* The file handler.
*/
public function __construct(FileSystemInterface $file_system) {
$this->fileSystem = $file_system;
}
/**
* {@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) {
$path = 'assets://' . $file_extension;
// Prefix filename to prevent blocking by firewalls which reject files
// starting with "ad*".
$filename = $file_extension . '_' . Crypt::hashBase64($data) . '.' . $file_extension;
$uri = $path . '/' . $filename;
return $this->dumpToUri($data, $file_extension, $uri);
}
/**
* {@inheritdoc}
*/
public function dumpToUri(string $data, string $file_extension, string $uri): string {
$path = 'assets://' . $file_extension;
// Create the CSS or JS file.
$this->fileSystem->prepareDirectory($path, FileSystemInterface::CREATE_DIRECTORY);
try {
if (!file_exists($uri) && !$this->fileSystem->saveData($data, $uri, FileExists::Replace)) {
return FALSE;
}
}
catch (FileException) {
return FALSE;
}
// If CSS/JS gzip compression is enabled then create a gzipped version of
// this file. This file is served conditionally to browsers that accept gzip
// using .htaccess rules. It's possible that the rewrite rules in .htaccess
// aren't working on this server, but there's no harm (other than the time
// spent generating the file) in generating the file anyway. Sites on
// servers where rewrite rules aren't working can set css.gzip to FALSE in
// order to skip generating a file that won't be used.
if (\Drupal::config('system.performance')->get($file_extension . '.gzip')) {
try {
if (!file_exists($uri . '.gz') && !$this->fileSystem->saveData(gzencode($data, 9, FORCE_GZIP), $uri . '.gz', FileExists::Replace)) {
return FALSE;
}
}
catch (FileException) {
return FALSE;
}
}
return $uri;
}
}
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