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<?php |
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namespace N1215\Jugoya; |
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use Interop\Http\Server\MiddlewareInterface; |
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use Interop\Http\Server\RequestHandlerInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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class DelegateHandler implements RequestHandlerInterface |
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{ |
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/** |
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* @var RequestHandlerInterface |
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*/ |
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private $coreHandler; |
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/** |
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* @var MiddlewareInterface[] |
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*/ |
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private $middlewareStack = []; |
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/** |
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* @param RequestHandlerInterface $coreHandler |
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* @param MiddlewareInterface[] $middlewareStack |
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*/ |
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public function __construct(RequestHandlerInterface $coreHandler, array $middlewareStack) |
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{ |
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$this->coreHandler = $coreHandler; |
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foreach ($middlewareStack as $middleware) { |
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$this->addMiddleware($middleware); |
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} |
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} |
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/** |
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* @param MiddlewareInterface $middleware |
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*/ |
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private function addMiddleware(MiddlewareInterface $middleware) |
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{ |
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$this->middlewareStack[] = $middleware; |
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} |
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/** |
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* @param ServerRequestInterface $request |
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* @return ResponseInterface |
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*/ |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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$count = count($this->middlewareStack); |
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switch ($count) { |
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case 0: |
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return $this->coreHandler->handle($request); |
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case 1: |
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return $this->middlewareStack[0]->process($request, $this->coreHandler); |
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default: |
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/** @var RequestHandlerInterface $handler */ |
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$handler = array_reduce( |
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array_reverse($this->middlewareStack), |
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function(RequestHandlerInterface $handler, MiddlewareInterface $middleware) { |
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return new self($handler, [$middleware]); |
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}, |
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$this->coreHandler |
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); |
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return $handler->handle($request); |
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} |
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} |
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} |
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n1215 /
jugoya
