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<?php |
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namespace BrainExe\Core\Middleware; |
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use BrainExe\Core\Annotations\Middleware; |
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use BrainExe\Core\Traits\IdGeneratorTrait; |
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use BrainExe\Core\Traits\TimeTrait; |
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use Symfony\Component\HttpFoundation\Cookie; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpFoundation\Session\SessionInterface; |
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use Symfony\Component\Routing\Exception\MethodNotAllowedException; |
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use Symfony\Component\Routing\Route; |
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/** |
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* @Middleware("Middleware.Csrf") |
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*/ |
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class Csrf extends AbstractMiddleware |
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{ |
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const CSRF = 'csrf'; |
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const HEADER = 'X-XSRF-TOKEN'; |
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const COOKIE = 'XSRF-TOKEN'; |
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const LIFETIME = 3600; // 1h |
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use IdGeneratorTrait; |
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use TimeTrait; |
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/** |
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* @var string |
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*/ |
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private $newToken = null; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function processRequest(Request $request, Route $route) |
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{ |
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$givenToken = $request->headers->get(self::HEADER); |
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$session = $request->getSession(); |
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$expectedToken = $session->get(self::CSRF); |
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if ($request->isMethod('GET') && (!$route->hasOption(self::CSRF)) || $route->hasDefault('_guest')) { |
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if (empty($expectedToken)) { |
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$this->renewCsrfToken(); |
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} |
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return; |
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} |
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if (empty($givenToken) || $givenToken !== $expectedToken) { |
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throw new MethodNotAllowedException(['POST'], 'invalid CSRF token'); |
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} |
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$this->generateNewTokenWhenNeeded($session); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function processResponse(Request $request, Response $response) |
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{ |
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if ($this->newToken) { |
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$session = $request->getSession(); |
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$session->set(self::CSRF, $this->newToken); |
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$session->set('csrf_timestamp', $this->now()); |
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$response->headers->setCookie(new Cookie(self::COOKIE, $this->newToken, 0, '/', null, false, false)); |
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$this->newToken = null; |
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} |
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} |
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/** |
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* @return void |
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*/ |
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private function renewCsrfToken() |
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{ |
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$this->newToken = $this->generateRandomId(); |
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} |
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/** |
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* @param SessionInterface $session |
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*/ |
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private function generateNewTokenWhenNeeded(SessionInterface $session) |
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{ |
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$now = $this->now(); |
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$lastUpdate = $session->get('csrf_timestamp'); |
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if ($lastUpdate + self::LIFETIME < $now) { |
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$this->renewCsrfToken(); |
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} |
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} |
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} |
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brainexe /
core
