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<?php |
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namespace Schnittstabil\Psr7\Csrf\Middlewares; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Schnittstabil\Psr7\Csrf\RequestAttributesTrait; |
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/** |
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* Middleware for accepting CSRF tokens sent by HTTP headers. |
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*/ |
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class AcceptHeaderToken |
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{ |
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use RequestAttributesTrait; |
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/** |
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* Used to validate tokens. |
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* |
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* @var callable |
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*/ |
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protected $tokenValidator; |
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/** |
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* Header field name. |
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* |
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* @var string |
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*/ |
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protected $headerName; |
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/** |
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* Create new AcceptHeaderToken middleware. |
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* |
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* @param callable $tokenValidator Used to validate tokens |
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* @param string $headerName Header field name |
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*/ |
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public function __construct(callable $tokenValidator, $headerName = 'X-XSRF-TOKEN') |
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{ |
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$this->tokenValidator = $tokenValidator; |
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$this->headerName = $headerName; |
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} |
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/** |
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* Invoke middleware. |
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* |
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* @param ServerRequestInterface $request request object |
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* @param ResponseInterface $response response object |
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* @param callable $next next middleware |
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* |
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* @return ResponseInterface response object |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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$isValid = $request->getAttribute(self::$isValidAttribute, false); |
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$violations = $request->getAttribute(self::$violationsAttribute, []); |
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foreach ($request->getHeader($this->headerName) as $token) { |
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$tokenViolations = call_user_func($this->tokenValidator, $token); |
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if (count($tokenViolations) === 0) { |
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$isValid = true; |
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continue; |
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} |
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$violations = array_merge($violations, $tokenViolations); |
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} |
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return $next($request |
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->withAttribute(self::$isValidAttribute, $isValid) |
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->withAttribute(self::$violationsAttribute, $violations), $response); |
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} |
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} |
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schnittstabil /
psr7-csrf-middleware
