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<?php |
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namespace Chubbyphp\Csrf; |
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use Chubbyphp\ErrorHandler\HttpException; |
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use Chubbyphp\Session\SessionInterface; |
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use Psr\Http\Message\ServerRequestInterface as Request; |
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use Psr\Http\Message\ResponseInterface as Response; |
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final class CsrfMiddleware |
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{ |
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/** |
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* @var CsrfTokenGeneratorInterface |
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*/ |
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private $csrfTokenGenerator; |
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/** |
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* @var SessionInterface |
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*/ |
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private $session; |
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const CSRF_KEY = 'csrf'; |
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const EXCEPTION_STATUS = 424; |
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const EXCEPTION_MISSING_IN_SESSION = 'Csrf token is missing within session'; |
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const EXCEPTION_MISSING_IN_BODY = 'Csrf token is missing within body'; |
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const EXCEPTION_IS_NOT_SAME = 'Csrf token within body is not the same as in session'; |
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/** |
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* @param CsrfTokenGeneratorInterface $csrfTokenGenerator |
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* @param SessionInterface $session |
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*/ |
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public function __construct(CsrfTokenGeneratorInterface $csrfTokenGenerator, SessionInterface $session) |
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{ |
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$this->csrfTokenGenerator = $csrfTokenGenerator; |
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$this->session = $session; |
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} |
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/** |
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* @param Request $request |
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* @param Response $response |
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* @param callable $next |
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* |
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* @return Response |
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*/ |
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public function __invoke(Request $request, Response $response, callable $next = null) |
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{ |
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if (in_array($request->getMethod(), ['POST', 'PUT', 'DELETE', 'PATCH'])) { |
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$this->checkCsrf($request, $response); |
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} |
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if (!$this->session->has($request, self::CSRF_KEY)) { |
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$this->session->set($request, self::CSRF_KEY, $this->csrfTokenGenerator->generate()); |
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} |
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if (null !== $next) { |
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$response = $next($request, $response); |
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} |
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return $response; |
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} |
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/** |
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* @param Request $request |
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* @param Response $response |
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* |
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* @throws HttpException |
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*/ |
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private function checkCsrf(Request $request, Response $response) |
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{ |
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if (!$this->session->has($request, self::CSRF_KEY)) { |
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$this->throwException($request, $response, self::EXCEPTION_MISSING_IN_SESSION); |
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} |
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$data = $request->getParsedBody(); |
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if (!isset($data[self::CSRF_KEY])) { |
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$this->throwException($request, $response, self::EXCEPTION_MISSING_IN_BODY); |
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} |
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if ($this->session->get($request, self::CSRF_KEY) !== $data[self::CSRF_KEY]) { |
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$this->throwException($request, $response, self::EXCEPTION_IS_NOT_SAME); |
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} |
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} |
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/** |
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* @param Request $request |
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* @param Response $response |
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* @param string $message |
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* |
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* @throws HttpException |
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*/ |
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private function throwException(Request $request, Response $response, string $message) |
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{ |
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throw HttpException::create($request, $response, self::EXCEPTION_STATUS, $message); |
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} |
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} |
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chubbyphp /
chubbyphp-csrf
