mirror of
https://github.com/friendica/friendica
synced 2025-04-26 11:10:11 +00:00
114 lines
2.9 KiB
PHP
114 lines
2.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2023, the Friendica project
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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 <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Core\Config\Util;
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/**
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* Serialize utils
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*
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* Retrieved from https://github.com/WordPress/wordpress-develop/blob/6.1/src/wp-includes/functions.php
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*/
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class SerializeUtil
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{
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public static function maybeUnserialize($value)
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{
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if (static::isSerialized($value)) {
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return @unserialize(trim($value));
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}
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return $value;
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}
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/**
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* Checks value to find if it was serialized.
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*
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* If $data is not a string, then returned value will always be false.
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* Serialized data is always a string.
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*
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* @param mixed $data Value to check to see if was serialized.
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* @param bool $strict Optional. Whether to be strict about the end of the string. Default true.
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*
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* @return bool False if not serialized and true if it was.
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* @since 6.1.0 Added Enum support.
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*
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* @since 2.0.5
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*/
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public static function isSerialized($data, bool $strict = true): bool
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{
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// If it isn't a string, it isn't serialized.
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if (!is_string($data)) {
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return false;
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}
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$data = trim($data);
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if ('N;' === $data) {
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return true;
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}
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if (strlen($data) < 4) {
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return false;
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}
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if (':' !== $data[1]) {
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return false;
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}
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if ($strict) {
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$lastc = substr($data, -1);
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if (';' !== $lastc && '}' !== $lastc) {
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return false;
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}
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} else {
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$semicolon = strpos($data, ';');
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$brace = strpos($data, '}');
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// Either ; or } must exist.
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if (false === $semicolon && false === $brace) {
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return false;
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}
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// But neither must be in the first X characters.
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if (false !== $semicolon && $semicolon < 3) {
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return false;
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}
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if (false !== $brace && $brace < 4) {
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return false;
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}
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}
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$token = $data[0];
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switch ($token) {
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case 's':
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if ($strict) {
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if ('"' !== substr($data, -2, 1)) {
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return false;
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}
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} elseif (false === strpos($data, '"')) {
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return false;
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}
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// Or else fall through.
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// no break
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case 'a':
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case 'O':
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case 'E':
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return (bool)preg_match("/^{$token}:[0-9]+:/s", $data);
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case 'b':
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case 'i':
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case 'd':
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$end = $strict ? '$' : '';
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return (bool)preg_match("/^{$token}:[0-9.E+-]+;$end/", $data);
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}
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return false;
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}
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}
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