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<?php
/**
* SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OCA\DAV\Connector\Sabre;
class MtimeSanitizer {
public static function sanitizeMtime(string $mtimeFromRequest): int {
// In PHP 5.X "is_numeric" returns true for strings in hexadecimal
// notation. This is no longer the case in PHP 7.X, so this check
// ensures that strings with hexadecimal notations fail too in PHP 5.X.
$isHexadecimal = preg_match('/^\s*0[xX]/', $mtimeFromRequest);
if ($isHexadecimal || !is_numeric($mtimeFromRequest)) {
throw new \InvalidArgumentException('X-OC-MTime header must be an integer (unix timestamp).');
}
// Prevent writing invalid mtime (timezone-proof)
if ((int)$mtimeFromRequest <= 24 * 60 * 60) {
throw new \InvalidArgumentException('X-OC-MTime header must be a valid positive integer');
}
return (int)$mtimeFromRequest;
}
}
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