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