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<?php |
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declare(strict_types=1); |
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namespace Tebe\Pvc\Middleware; |
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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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class MiddlewareStack 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 $requestHandler; |
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/** |
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* @var MiddlewareInterface[] |
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*/ |
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private $middlewares = []; |
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/** |
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* @param RequestHandlerInterface $requestHandler |
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*/ |
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private function __construct(RequestHandlerInterface $requestHandler) |
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{ |
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$this->requestHandler = $requestHandler; |
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} |
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/** |
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* @param RequestHandlerInterface $requestHandler |
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* @param MiddlewareInterface[] $middlewares LIFO array of middlewares |
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* @return self |
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*/ |
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public static function create(RequestHandlerInterface $requestHandler, array $middlewares = []): self |
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{ |
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$stack = new self($requestHandler); |
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foreach ($middlewares as $middleware) { |
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$stack = $stack->push($middleware); |
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} |
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return $stack; |
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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 $request): ResponseInterface |
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{ |
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$next = $this->peek(); |
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if (null === $next) { |
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return $this->requestHandler->handle($request); |
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} |
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return $next->process($request, $this->pop()); |
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} |
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/** |
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* Creates a new stack with the given middleware pushed. |
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* |
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* @param MiddlewareInterface $middleware |
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* @return self |
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*/ |
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public function push(MiddlewareInterface $middleware): self |
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{ |
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$stack = clone $this; |
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array_unshift($stack->middlewares, $middleware); |
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return $stack; |
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} |
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/** |
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* @return MiddlewareInterface|null |
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*/ |
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private function peek() |
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{ |
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return reset($this->middlewares) ?: null; |
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} |
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/** |
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* @return self |
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*/ |
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private function pop(): self |
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{ |
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$stack = clone $this; |
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array_shift($stack->middlewares); |
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return $stack; |
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} |
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} |
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tbreuss /
pvc
