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<?php
declare(strict_types=1);
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Core\Resource;
use TYPO3\CMS\Core\Utility\GeneralUtility;
/**
* This fixes import paths in CSS files if their location changes,
* e.g. when inlining or compressing css
*
* @internal This class is not part of the TYPO3 API.
*/
class RelativeCssPathFixer
{
/**
* Fixes the relative paths inside of url() references in CSS files
*
* @param string $contents Data to process
* @param string $newDir directory referenced from current location
* @return string Processed data
*/
public function fixRelativeUrlPaths(string $contents, string $newDir): string
{
// Replace "url()" paths
if (stripos($contents, 'url') !== false) {
$regex = '/url(\\(\\s*["\']?(?!\\/)([^"\']+)["\']?\\s*\\))/iU';
$contents = $this->findAndReplaceUrlPathsByRegex($contents, $regex, $newDir, '(\'|\')');
}
// Replace "@import" paths
if (stripos($contents, '@import') !== false) {
$regex = '/@import\\s*(["\']?(?!\\/)([^"\']+)["\']?)/i';
$contents = $this->findAndReplaceUrlPathsByRegex($contents, $regex, $newDir, '"|"');
}
return $contents;
}
/**
* Finds and replaces all URLs by using a given regex
*
* @param string $contents Data to process
* @param string $regex Regex used to find URLs in content
* @param string $newDir Path to prepend to the original file
* @param string $wrap Wrap around replaced values
* @return string Processed data
*/
protected function findAndReplaceUrlPathsByRegex(string $contents, string $regex, string $newDir, string $wrap = '|'): string
{
$matches = [];
$replacements = [];
$wrapParts = explode('|', $wrap);
preg_match_all($regex, $contents, $matches);
foreach ($matches[2] as $matchCount => $match) {
// remove '," or white-spaces around
$match = trim($match, '\'" ');
// we must not rewrite paths containing ":" or "url(", e.g. data URIs (see RFC 2397)
if (!str_contains($match, ':') && !preg_match('/url\\s*\\(/i', $match)) {
$newPath = GeneralUtility::resolveBackPath($newDir . $match);
$replacements[$matches[1][$matchCount]] = $wrapParts[0] . $newPath . $wrapParts[1];
}
}
// replace URL paths in content
if (!empty($replacements)) {
$contents = str_replace(array_keys($replacements), array_values($replacements), $contents);
}
return $contents;
}
}