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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\View\Asset\MergeStrategy;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\View\Asset\Source;
/**
* Skip merging if all of the files that need to be merged were not modified
*
* Each file will be resolved and its mtime will be checked.
* Then combination of all mtimes will be compared to a special .dat file that contains mtimes from previous merging
*/
class Checksum implements \Magento\Framework\View\Asset\MergeStrategyInterface
{
/**
* @var \Magento\Framework\View\Asset\MergeStrategyInterface
*/
protected $strategy;
/**
* @var \Magento\Framework\Filesystem
*/
protected $filesystem;
/**
* @var Source
*/
private $assetSource;
/**
* @param \Magento\Framework\View\Asset\MergeStrategyInterface $strategy
* @param \Magento\Framework\Filesystem $filesystem
*/
public function __construct(
\Magento\Framework\View\Asset\MergeStrategyInterface $strategy,
\Magento\Framework\Filesystem $filesystem
) {
$this->strategy = $strategy;
$this->filesystem = $filesystem;
}
/**
* @deprecated 101.0.0
* @return Source
*/
private function getAssetSource()
{
if (!$this->assetSource) {
$this->assetSource = ObjectManager::getInstance()->get(Source::class);
}
return $this->assetSource;
}
/**
* {@inheritdoc}
*/
public function merge(array $assetsToMerge, \Magento\Framework\View\Asset\LocalInterface $resultAsset)
{
$rootDir = $this->filesystem->getDirectoryRead(DirectoryList::ROOT);
$mTime = null;
/** @var \Magento\Framework\View\Asset\MergeableInterface $asset */
foreach ($assetsToMerge as $asset) {
$sourceFile = $this->getAssetSource()->findSource($asset);
$mTime .= $rootDir->stat($rootDir->getRelativePath($sourceFile))['mtime'];
}
if (null === $mTime) {
return; // nothing to merge
}
$dat = $resultAsset->getPath() . '.dat';
$targetDir = $this->filesystem->getDirectoryWrite(DirectoryList::STATIC_VIEW);
if (!$targetDir->isExist($dat) || strcmp($mTime, $targetDir->readFile($dat)) !== 0) {
$this->strategy->merge($assetsToMerge, $resultAsset);
$targetDir->writeFile($dat, $mTime);
}
}
}