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<?php |
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namespace ByJG\RestServer\Middleware; |
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use ByJG\RestServer\Exception\Error401Exception; |
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use ByJG\RestServer\HttpRequest; |
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use ByJG\RestServer\HttpResponse; |
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use ByJG\RestServer\ResponseBag; |
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class CorsMiddleware implements BeforeMiddlewareInterface |
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{ |
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const CORS_OK = 'CORS_OK'; |
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const CORS_FAILED = 'CORS_FAILED'; |
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const CORS_OPTIONS = 'CORS_OPTIONS'; |
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protected $corsOrigins = ['.*']; |
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protected $corsMethods = [ 'GET', 'POST', 'PUT', 'DELETE', 'PATCH']; |
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protected $corsHeaders = [ |
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'Authorization', |
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'Content-Type', |
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'Accept', |
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'Origin', |
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'User-Agent', |
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'Cache-Control', |
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'Keep-Alive', |
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'X-Requested-With', |
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'If-Modified-Since' |
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]; |
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/** |
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* Undocumented function |
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* |
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* @param mixed $dispatcherStatus |
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* @param HttpResponse $response |
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* @param HttpRequest $request |
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* @return MiddlewareResult |
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*/ |
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public function beforeProcess( |
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$dispatcherStatus, |
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HttpResponse $response, |
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HttpRequest $request |
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) |
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{ |
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$corsStatus = $this->preFlight($response, $request); |
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if ($corsStatus != self::CORS_OK) { |
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if ($corsStatus == self::CORS_OPTIONS) { |
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$response->emptyResponse(); |
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$response->getResponseBag()->setSerializationRule(ResponseBag::RAW); |
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return MiddlewareResult::stopProcessingOthers(); |
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} elseif ($corsStatus == self::CORS_FAILED) { |
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throw new Error401Exception("CORS verification failed. Request Blocked."); |
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} |
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} |
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return MiddlewareResult::continue(); |
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} |
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/** |
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* Undocumented function |
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* |
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* @param HttpResponse $response |
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* @param HttpRequest $request |
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* @return string |
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*/ |
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protected function preFlight(HttpResponse $response, HttpRequest $request) |
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{ |
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// TODO: Still missing some headers |
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// https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request |
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$corsStatus = self::CORS_OK; |
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if (!empty($request->server('HTTP_ORIGIN'))) { |
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$corsStatus = self::CORS_FAILED; |
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foreach ((array)$this->corsOrigins as $origin) { |
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if (preg_match("~^.*//$origin$~", $request->server('HTTP_ORIGIN'))) { |
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$response->addHeader("Access-Control-Allow-Origin", $request->server('HTTP_ORIGIN')); |
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$response->addHeader('Access-Control-Allow-Credentials', 'true'); |
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$response->addHeader('Access-Control-Max-Age', '86400'); // cache for 1 day |
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// Access-Control headers are received during OPTIONS requests |
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if ($request->server('REQUEST_METHOD') == 'OPTIONS') { |
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$response->setResponseCode(204, 'No Content'); |
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$response->addHeader("Access-Control-Allow-Methods", implode(",", array_merge(['OPTIONS'], $this->corsMethods))); |
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$response->addHeader("Access-Control-Allow-Headers", implode(",", $this->corsHeaders)); |
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return self::CORS_OPTIONS; |
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} |
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$corsStatus = self::CORS_OK; |
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break; |
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} |
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} |
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} |
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return $corsStatus; |
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} |
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public function withCorsOrigins($origins) |
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{ |
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$this->corsOrigins = $origins; |
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return $this; |
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} |
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public function withAcceptCorsHeaders($headers) |
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{ |
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$this->corsHeaders = $headers; |
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return $this; |
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} |
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public function withAcceptCorsMethods($methods) |
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{ |
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$this->corsMethods = $methods; |
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return $this; |
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} |
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} |
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byjg /
restserver
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