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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2022 Robin Appelman <robin@icewind.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Files\Utils;
class PathHelper {
/**
* Make a path relative to a root path, or return null if the path is outside the root
*
* @param string $root
* @param string $path
* @return ?string
*/
public static function getRelativePath(string $root, string $path) {
if ($root === '' or $root === '/') {
return self::normalizePath($path);
}
if ($path === $root) {
return '/';
} elseif (strpos($path, $root . '/') !== 0) {
return null;
} else {
$path = substr($path, strlen($root));
return self::normalizePath($path);
}
}
/**
* @param string $path
* @return string
*/
public static function normalizePath(string $path): string {
if ($path === '' or $path === '/') {
return '/';
}
//no windows style slashes
$path = str_replace('\\', '/', $path);
//add leading slash
if ($path[0] !== '/') {
$path = '/' . $path;
}
//remove duplicate slashes
while (strpos($path, '//') !== false) {
$path = str_replace('//', '/', $path);
}
//remove trailing slash
$path = rtrim($path, '/');
return $path;
}
}
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