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37 lines
1.1 KiB
PHP
37 lines
1.1 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-only
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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($mtimeFromRequest)) {
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throw new \InvalidArgumentException(
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sprintf(
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'X-OC-MTime header must be a valid integer (unix timestamp), got "%s".',
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$mtimeFromRequest
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)
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);
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}
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// Prevent writing invalid mtime (timezone-proof)
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if ((int)$mtimeFromRequest <= 24 * 60 * 60) {
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throw new \InvalidArgumentException(
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sprintf(
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'X-OC-MTime header must be a valid positive unix timestamp greater than one day, got "%s".',
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$mtimeFromRequest
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)
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);
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}
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return (int)$mtimeFromRequest;
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}
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}
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