vendor/symfony/security-csrf/CsrfTokenManager.php line 27
- <?php
- /*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
- namespace Symfony\Component\Security\Csrf;
- use Symfony\Component\HttpFoundation\RequestStack;
- use Symfony\Component\Security\Core\Exception\InvalidArgumentException;
- use Symfony\Component\Security\Csrf\TokenGenerator\TokenGeneratorInterface;
- use Symfony\Component\Security\Csrf\TokenGenerator\UriSafeTokenGenerator;
- use Symfony\Component\Security\Csrf\TokenStorage\NativeSessionTokenStorage;
- use Symfony\Component\Security\Csrf\TokenStorage\TokenStorageInterface;
- /**
- * Default implementation of {@link CsrfTokenManagerInterface}.
- *
- * @author Bernhard Schussek <bschussek@gmail.com>
- * @author Kévin Dunglas <dunglas@gmail.com>
- */
- class CsrfTokenManager implements CsrfTokenManagerInterface
- {
- private TokenGeneratorInterface $generator;
- private TokenStorageInterface $storage;
- private \Closure|string $namespace;
- /**
- * @param $namespace
- * * null: generates a namespace using $_SERVER['HTTPS']
- * * string: uses the given string
- * * RequestStack: generates a namespace using the current main request
- * * callable: uses the result of this callable (must return a string)
- */
- public function __construct(TokenGeneratorInterface $generator = null, TokenStorageInterface $storage = null, string|RequestStack|callable $namespace = null)
- {
- $this->generator = $generator ?? new UriSafeTokenGenerator();
- $this->storage = $storage ?? new NativeSessionTokenStorage();
- $superGlobalNamespaceGenerator = function () {
- return !empty($_SERVER['HTTPS']) && 'off' !== strtolower($_SERVER['HTTPS']) ? 'https-' : '';
- };
- if (null === $namespace) {
- $this->namespace = $superGlobalNamespaceGenerator;
- } elseif ($namespace instanceof RequestStack) {
- $this->namespace = function () use ($namespace, $superGlobalNamespaceGenerator) {
- if ($request = $namespace->getMainRequest()) {
- return $request->isSecure() ? 'https-' : '';
- }
- return $superGlobalNamespaceGenerator();
- };
- } elseif ($namespace instanceof \Closure || \is_string($namespace)) {
- $this->namespace = $namespace;
- } elseif (\is_callable($namespace)) {
- $this->namespace = $namespace(...);
- } else {
- throw new InvalidArgumentException(sprintf('$namespace must be a string, a callable returning a string, null or an instance of "RequestStack". "%s" given.', get_debug_type($namespace)));
- }
- }
- public function getToken(string $tokenId): CsrfToken
- {
- $namespacedId = $this->getNamespace().$tokenId;
- if ($this->storage->hasToken($namespacedId)) {
- $value = $this->storage->getToken($namespacedId);
- } else {
- $value = $this->generator->generateToken();
- $this->storage->setToken($namespacedId, $value);
- }
- return new CsrfToken($tokenId, $this->randomize($value));
- }
- public function refreshToken(string $tokenId): CsrfToken
- {
- $namespacedId = $this->getNamespace().$tokenId;
- $value = $this->generator->generateToken();
- $this->storage->setToken($namespacedId, $value);
- return new CsrfToken($tokenId, $this->randomize($value));
- }
- public function removeToken(string $tokenId): ?string
- {
- return $this->storage->removeToken($this->getNamespace().$tokenId);
- }
- public function isTokenValid(CsrfToken $token): bool
- {
- $namespacedId = $this->getNamespace().$token->getId();
- if (!$this->storage->hasToken($namespacedId)) {
- return false;
- }
- return hash_equals($this->storage->getToken($namespacedId), $this->derandomize($token->getValue()));
- }
- private function getNamespace(): string
- {
- return \is_callable($ns = $this->namespace) ? $ns() : $ns;
- }
- private function randomize(string $value): string
- {
- $key = random_bytes(32);
- $value = $this->xor($value, $key);
- return sprintf('%s.%s.%s', substr(md5($key), 0, 1 + (\ord($key[0]) % 32)), rtrim(strtr(base64_encode($key), '+/', '-_'), '='), rtrim(strtr(base64_encode($value), '+/', '-_'), '='));
- }
- private function derandomize(string $value): string
- {
- $parts = explode('.', $value);
- if (3 !== \count($parts)) {
- return $value;
- }
- $key = base64_decode(strtr($parts[1], '-_', '+/'));
- if ('' === $key || false === $key) {
- return $value;
- }
- $value = base64_decode(strtr($parts[2], '-_', '+/'));
- return $this->xor($value, $key);
- }
- private function xor(string $value, string $key): string
- {
- if (\strlen($value) > \strlen($key)) {
- $key = str_repeat($key, ceil(\strlen($value) / \strlen($key)));
- }
- return $value ^ $key;
- }
- }