129 lines
3.5 KiB
PHP
129 lines
3.5 KiB
PHP
<?php
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/**
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* This file is part of the ForkBB <https://github.com/forkbb>.
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*
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* @copyright (c) Visman <mio.visman@yandex.ru, https://github.com/MioVisman>
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* @license The MIT License (MIT)
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*/
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declare(strict_types=1);
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namespace ForkBB\Core;
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use ForkBB\Core\Secury;
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use SensitiveParameter;
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class Csrf
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{
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const TOKEN_LIFETIME = 1800;
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protected ?string $error = null;
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protected int $hashExpiration = 3600;
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public function __construct(protected Secury $secury, #[SensitiveParameter] protected string $key)
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{
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}
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/**
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* Устанавливает срок жизни хэша
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*/
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public function setHashExpiration(int $exp): void
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{
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$this->hashExpiration = $exp > 0 ? $exp : 3600;
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}
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/**
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* Возвращает csrf токен
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*/
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public function create(string $marker, array $args = [], int|string $time = null): string
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{
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$marker = $this->argsToStr($marker, $args);
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$time = $time ?: \time();
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return $this->secury->hmac($marker, $time . $this->key) . 's' . $time;
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}
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/**
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* Возвращает хэш
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*/
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public function createHash(string $marker, array $args = [], int|string $time = null): string
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{
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$marker = $this->argsToStr($marker, $args, ['hash']);
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$time = $time ?: \time() + $this->hashExpiration;
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return $this->secury->hash($marker . $time) . 'e' . $time;
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}
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protected function argsToStr(string $marker, array $args, array $forDel = []): string
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{
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$marker .= '|';
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if (! empty($forDel)) {
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$args = \array_diff_key($args, \array_flip($forDel));
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}
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unset($args['token'], $args['#']);
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\ksort($args);
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foreach ($args as $key => $value) {
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if (null !== $value) {
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$marker .= "{$key}|{$value}|";
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}
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}
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return $marker;
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}
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/**
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* Проверка токена/хэша
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*/
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public function verify($token, string $marker, array $args = []): bool
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{
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$this->error = 'Bad token';
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$now = \time();
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$result = false;
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if (
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\is_string($token)
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&& \preg_match('%(e|s)(\d+)$%D', $token, $matches)
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) {
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switch ($matches[1]) {
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// токен
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case 's':
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if ($matches[2] + self::TOKEN_LIFETIME < $now) {
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// просрочен
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$this->error = 'Expired token';
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} elseif (
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$matches[2] + 0 <= $now
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&& \hash_equals($this->create($marker, $args, $matches[2]), $token)
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) {
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$this->error = null;
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$result = true;
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}
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break;
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// хэш
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case 'e':
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if ($matches[2] + 0 < $now) {
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// просрочен
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$this->error = 'Expired token';
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} elseif (\hash_equals($this->createHash($marker, $args, $matches[2]), $token)) {
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$this->error = null;
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$result = true;
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}
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break;
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}
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}
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return $result;
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}
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/**
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* Возвращает ошибку из метода verify
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*/
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public function getError(): ?string
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{
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return $this->error;
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}
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}
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