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<?php |
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declare(strict_types=1); |
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namespace Chubbyphp\Cors; |
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use Chubbyphp\Cors\Negotiation\HeadersNegotiatorInterface; |
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use Chubbyphp\Cors\Negotiation\MethodNegotiatorInterface; |
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use Chubbyphp\Cors\Negotiation\Origin\OriginNegotiatorInterface; |
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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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final class CorsMiddleware implements MiddlewareInterface |
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{ |
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/** |
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* @var ResponseFactoryInterface |
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*/ |
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private $responseFactory; |
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/** |
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* @var OriginNegotiatorInterface |
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*/ |
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private $originNegotiator; |
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/** |
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* @var MethodNegotiatorInterface |
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*/ |
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private $methodNegotiator; |
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/** |
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* @var HeadersNegotiatorInterface |
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*/ |
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private $headersNegotiator; |
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/** |
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* @var array<string> |
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*/ |
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private $exposeHeaders; |
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/** |
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* @var bool |
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*/ |
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private $allowCredentials; |
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/** |
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* @var int |
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*/ |
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private $maxAge; |
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/** |
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* @param array<string> $exposeHeaders |
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*/ |
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public function __construct( |
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ResponseFactoryInterface $responseFactory, |
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OriginNegotiatorInterface $originNegotiator, |
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MethodNegotiatorInterface $methodNegotiator, |
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HeadersNegotiatorInterface $headersNegotiator, |
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array $exposeHeaders = [], |
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bool $allowCredentials = false, |
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int $maxAge = 600 |
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) { |
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$this->responseFactory = $responseFactory; |
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$this->originNegotiator = $originNegotiator; |
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$this->methodNegotiator = $methodNegotiator; |
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$this->headersNegotiator = $headersNegotiator; |
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$this->exposeHeaders = $exposeHeaders; |
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$this->allowCredentials = $allowCredentials; |
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$this->maxAge = $maxAge; |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$allowOrigin = $this->originNegotiator->negotiate($request); |
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if ($this->isPreflight($request)) { |
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return $this->handlePreflight($request, $allowOrigin); |
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} |
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return $this->handle($request, $handler, $allowOrigin); |
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} |
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private function isPreflight(ServerRequestInterface $request): bool |
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{ |
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return 'OPTIONS' === strtoupper($request->getMethod()); |
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} |
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private function handlePreflight(ServerRequestInterface $request, ?string $allowOrigin): ResponseInterface |
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{ |
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$response = $this->responseFactory->createResponse(204); |
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if (null === $allowOrigin) { |
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return $response; |
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} |
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$response = $this->addAllowOrigin($response, $allowOrigin); |
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$response = $this->addAllowCredentials($response); |
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$response = $this->addExposeHeaders($response); |
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1 |
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if (!$this->methodNegotiator->negotiate($request)) { |
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return $response; |
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} |
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$response = $this->addAllowMethod($response); |
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if (!$this->headersNegotiator->negotiate($request)) { |
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return $response; |
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} |
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$response = $this->addAllowHeaders($response); |
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return $this->addMaxAge($response); |
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} |
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private function handle( |
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ServerRequestInterface $request, |
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RequestHandlerInterface $handler, |
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?string $allowOrigin |
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): ResponseInterface { |
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$response = $handler->handle($request); |
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3 |
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if (null === $allowOrigin) { |
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return $response; |
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} |
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$response = $this->addAllowOrigin($response, $allowOrigin); |
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$response = $this->addAllowCredentials($response); |
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3 |
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return $this->addExposeHeaders($response); |
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} |
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private function addAllowOrigin(ResponseInterface $response, string $allowOrigin): ResponseInterface |
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{ |
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return $response->withHeader('Access-Control-Allow-Origin', $allowOrigin); |
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} |
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private function addAllowCredentials(ResponseInterface $response): ResponseInterface |
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{ |
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return $response->withHeader('Access-Control-Allow-Credentials', $this->allowCredentials ? 'true' : 'false'); |
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} |
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private function addExposeHeaders(ResponseInterface $response): ResponseInterface |
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{ |
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if ([] === $this->exposeHeaders) { |
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return $response; |
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} |
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return $response->withHeader('Access-Control-Expose-Headers', implode(', ', $this->exposeHeaders)); |
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} |
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private function addAllowMethod(ResponseInterface $response): ResponseInterface |
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{ |
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return $response->withHeader( |
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'Access-Control-Allow-Methods', |
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implode(', ', $this->methodNegotiator->getAllowedMethods()) |
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); |
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} |
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private function addAllowHeaders(ResponseInterface $response): ResponseInterface |
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{ |
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return $response->withHeader( |
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'Access-Control-Allow-Headers', |
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implode(', ', $this->headersNegotiator->getAllowedHeaders()) |
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); |
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} |
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private function addMaxAge(ResponseInterface $response): ResponseInterface |
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{ |
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return $response->withHeader('Access-Control-Max-Age', (string) $this->maxAge); |
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} |
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} |
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chubbyphp /
chubbyphp-cors
