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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\Filesystem;
use Magento\Framework\Math\Random;
use Magento\Framework\View\Asset;
use Magento\Framework\View\Asset\MergeStrategyInterface;
use Magento\Framework\View\Url\CssResolver;
/**
* The actual merging service
*/
class Direct implements MergeStrategyInterface
{
/**
* Delimiters for merging files of various content type
*/
private const MERGE_DELIMITER_JS = ';';
private const MERGE_DELIMITER_EMPTY = '';
/**
* @var Filesystem
*/
private $filesystem;
/**
* @var CssResolver
*/
private $cssUrlResolver;
/**
* @var Random
*/
private $mathRandom;
/**
* @param Filesystem $filesystem
* @param CssResolver $cssUrlResolver
* @param Random|null $mathRandom
*/
public function __construct(
Filesystem $filesystem,
CssResolver $cssUrlResolver,
Random $mathRandom = null
) {
$this->filesystem = $filesystem;
$this->cssUrlResolver = $cssUrlResolver;
$this->mathRandom = $mathRandom ?: ObjectManager::getInstance()->get(Random::class);
}
/**
* @inheritdoc
*/
public function merge(array $assetsToMerge, Asset\LocalInterface $resultAsset)
{
$mergedContent = $this->composeMergedContent($assetsToMerge, $resultAsset);
$filePath = $resultAsset->getPath();
$tmpFilePath = $filePath . $this->mathRandom->getUniqueHash('_');
$staticDir = $this->filesystem->getDirectoryWrite(DirectoryList::STATIC_VIEW);
$staticDir->writeFile($tmpFilePath, $mergedContent);
$staticDir->renameFile($tmpFilePath, $filePath, $staticDir);
}
/**
* Merge files together and modify content if needed
*
* @param array $assetsToMerge
* @param Asset\LocalInterface $resultAsset
* @return array|string
*/
private function composeMergedContent(array $assetsToMerge, Asset\LocalInterface $resultAsset)
{
$result = [];
/** @var Asset\MergeableInterface $asset */
foreach ($assetsToMerge as $asset) {
$result[] = $this->preProcessBeforeMerging($asset, $resultAsset, $asset->getContent());
}
$delimiter = $this->_getFilesContentDelimiter($resultAsset->getContentType());
$result = $this->preProcessMergeResult($resultAsset, ltrim(implode($delimiter, $result)));
return $result;
}
/**
* Process an asset before merging into resulting asset
*
* @param Asset\LocalInterface $item
* @param Asset\LocalInterface $result
* @param string $content
* @return string
*/
private function preProcessBeforeMerging(Asset\LocalInterface $item, Asset\LocalInterface $result, $content)
{
if ($result->getContentType() == 'css') {
$from = $item->getPath();
$to = $result->getPath();
return $this->cssUrlResolver->relocateRelativeUrls($content, $from, $to);
}
return $content;
}
/**
* Process the resulting asset after merging content is done
*
* @param Asset\LocalInterface $result
* @param string $content
* @return string
*/
private function preProcessMergeResult(Asset\LocalInterface $result, $content)
{
if ($result->getContentType() == 'css') {
$content = $this->cssUrlResolver->aggregateImportDirectives($content);
}
return $content;
}
/**
* Return delimiter for separation of merged files content
*
* @param string $contentType
* @return string
*/
protected function _getFilesContentDelimiter($contentType)
{
if ($contentType == 'js') {
return self::MERGE_DELIMITER_JS;
}
return self::MERGE_DELIMITER_EMPTY;
}
}