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42 lines
1.5 KiB
PHP
42 lines
1.5 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2021, Louis Chemineau <louis@chmn.me>
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*
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* @author Louis Chemineau <louis@chmn.me>
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*
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* @license AGPL-3.0
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*
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* This code 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, version 3,
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* as published by the Free Software Foundation.
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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, version 3,
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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 OCA\DAV\Connector\Sabre;
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class MtimeSanitizer {
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public static function sanitizeMtime(string $mtimeFromRequest): int {
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// In PHP 5.X "is_numeric" returns true for strings in hexadecimal
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// notation. This is no longer the case in PHP 7.X, so this check
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// ensures that strings with hexadecimal notations fail too in PHP 5.X.
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$isHexadecimal = preg_match('/^\s*0[xX]/', $mtimeFromRequest);
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if ($isHexadecimal || !is_numeric($mtimeFromRequest)) {
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throw new \InvalidArgumentException('X-OC-MTime header must be an integer (unix timestamp).');
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}
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// Prevent writing invalid mtime (timezone-proof)
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if ((int)$mtimeFromRequest <= 24 * 60 * 60) {
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throw new \InvalidArgumentException('X-OC-MTime header must be a valid positive integer');
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}
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return (int)$mtimeFromRequest;
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}
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}
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