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<?php |
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namespace Yiisoft\Yii\Web\Middleware; |
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use Psr\Http\Message\ResponseFactoryInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Yiisoft\Router\Method; |
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use Yiisoft\Security\Random; |
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use Yiisoft\Security\TokenMasker; |
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use Yiisoft\Yii\Web\Session\SessionInterface; |
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final class Csrf implements MiddlewareInterface |
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{ |
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private const NAME = '_csrf'; |
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public const HEADER_NAME = 'X-CSRF-Token'; |
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public const REQUEST_NAME = 'csrf_token'; |
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private $name = self::NAME; |
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private $requestName = self::REQUEST_NAME; |
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private $responseFactory; |
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private $session; |
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public function __construct(ResponseFactoryInterface $responseFactory, SessionInterface $session) |
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{ |
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$this->responseFactory = $responseFactory; |
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$this->session = $session; |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$token = $this->getToken(); |
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if (!$this->validateCsrfToken($request, $token)) { |
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$this->session->remove($this->name); |
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$response = $this->responseFactory->createResponse(400); |
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$response->getBody()->write('Unable to verify your data submission.'); |
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return $response; |
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} |
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$request = $request->withAttribute($this->requestName, TokenMasker::mask($token)); |
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return $handler->handle($request); |
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} |
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public function setName(string $name): void |
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{ |
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$this->name = $name; |
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} |
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public function setRequestName(string $name): void |
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{ |
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$this->requestName = $name; |
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} |
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private function getToken(): ?string |
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{ |
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$token = $this->session->get($this->name); |
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if (empty($token)) { |
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$token = Random::string(); |
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$this->session->set($this->name, $token); |
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} |
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return $token; |
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} |
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private function validateCsrfToken(ServerRequestInterface $request, ?string $trueToken): bool |
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{ |
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$method = $request->getMethod(); |
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if (\in_array($method, [Method::GET, Method::HEAD, Method::OPTIONS], true)) { |
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return true; |
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} |
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$unmaskedToken = $this->getTokenFromRequest($request); |
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return !empty($unmaskedToken) && hash_equals($unmaskedToken, $trueToken); |
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} |
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private function getTokenFromRequest(ServerRequestInterface $request): ?string |
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{ |
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$parsedBody = $request->getParsedBody(); |
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$token = $parsedBody[$this->name] ?? null; |
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if (empty($token)) { |
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$headers = $request->getHeader(self::HEADER_NAME); |
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$token = \reset($headers); |
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} |
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return TokenMasker::unmask($token); |
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} |
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} |
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yiisoft /
yii-web
