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<?php namespace Neomerx\CorsIlluminate; |
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/** |
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* Copyright 2015-2019 [email protected] |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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use \Closure; |
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use \Illuminate\Http\Request; |
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use \Illuminate\Http\Response; |
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use \Psr\Http\Message\RequestInterface; |
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use \Neomerx\Cors\Contracts\AnalyzerInterface; |
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use \Neomerx\Cors\Contracts\AnalysisResultInterface; |
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use \Neomerx\Cors\Contracts\Constants\CorsResponseHeaders; |
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use \Neomerx\CorsIlluminate\Adapters\IlluminateRequestToPsr7; |
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use \Illuminate\Contracts\Container\Container as ContainerInterface; |
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/** |
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* @package Neomerx\CorsIlluminate |
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*/ |
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class CorsMiddleware |
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{ |
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/** |
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* @var AnalyzerInterface |
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*/ |
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private $analyzer; |
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/** |
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* @var ContainerInterface |
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*/ |
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private $container; |
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/** |
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* @param AnalyzerInterface $analyzer |
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* @param ContainerInterface $container |
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*/ |
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public function __construct(AnalyzerInterface $analyzer, ContainerInterface $container) |
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{ |
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$this->analyzer = $analyzer; |
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$this->container = $container; |
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} |
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/** |
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* Handle an incoming request. |
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* |
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* @param Request $request |
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* @param Closure $next |
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* |
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* @return mixed |
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*/ |
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public function handle(Request $request, Closure $next) |
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{ |
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$cors = $this->getCorsAnalysis($request); |
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switch ($cors->getRequestType()) { |
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case AnalysisResultInterface::TYPE_REQUEST_OUT_OF_CORS_SCOPE: |
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$response = $next($request); |
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break; |
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case AnalysisResultInterface::TYPE_PRE_FLIGHT_REQUEST: |
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$headers = $this->getPrepareCorsHeaders($cors->getResponseHeaders()); |
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$response = new Response(null, Response::HTTP_OK, $headers); |
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break; |
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case AnalysisResultInterface::TYPE_ACTUAL_REQUEST: |
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/** @var Response $response */ |
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$response = $next($request); |
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// merge CORS headers to response |
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foreach ($this->getPrepareCorsHeaders($cors->getResponseHeaders()) as $name => $value) { |
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$response->headers->set($name, $value, false); |
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} |
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break; |
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default: |
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$response = $this->getResponseOnError($cors); |
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break; |
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} |
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return $response; |
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} |
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/** |
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* You can override this method in order to customize error reply. |
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* |
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* @param AnalysisResultInterface $analysisResult |
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* |
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* @return Response |
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*/ |
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protected function getResponseOnError(AnalysisResultInterface $analysisResult) |
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{ |
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// avoid unused warning |
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$analysisResult ?: null; |
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return new Response(null, Response::HTTP_BAD_REQUEST); |
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} |
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/** |
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* This method saves analysis result in Illuminate Container for |
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* using it in other parts of the application (e.g. in exception handler). |
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* |
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* @param Request $request |
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* |
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* @return AnalysisResultInterface |
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*/ |
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protected function getCorsAnalysis(Request $request) |
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{ |
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$analysis = $this->analyzer->analyze($this->getRequestAdapter($request)); |
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$this->container->instance(AnalysisResultInterface::class, $analysis); |
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return $analysis; |
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} |
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/** |
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* You can override this method to replace IlluminateRequestToPsr7 adapter with another one. |
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* |
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* @param Request $request |
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* |
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* @return RequestInterface |
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*/ |
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protected function getRequestAdapter(Request $request) |
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{ |
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return new IlluminateRequestToPsr7($request); |
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} |
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/** |
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* There is an issue with IE which cannot work with multiple 'Access-Control-Expose-Headers' and |
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* requires it them to be comma separated. Chrome and Firefox seem to be not affected. |
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* |
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* @param array $headers |
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* |
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* @return array |
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* |
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* @see https://github.com/neomerx/cors-psr7/issues/31 |
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*/ |
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protected function getPrepareCorsHeaders($headers) |
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{ |
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if (array_key_exists(CorsResponseHeaders::EXPOSE_HEADERS, $headers) === true) { |
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$headers[CorsResponseHeaders::EXPOSE_HEADERS] = |
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implode(', ', $headers[CorsResponseHeaders::EXPOSE_HEADERS]); |
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} |
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return $headers; |
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} |
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} |
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neomerx /
cors-illuminate
