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<?php |
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/** |
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* This file is part of slick/http |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Slick\Http\Server; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Slick\Http\Server\Exception\InvalidArgumentException; |
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use Slick\Http\Server\Exception\UnexpectedValueException; |
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use Slick\Http\Server\Middleware\CallableMiddleware; |
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/** |
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* MiddlewareStack |
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* |
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* @package Slick\Http\Server |
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*/ |
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class MiddlewareStack |
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{ |
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/** |
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* @var array|MiddlewareInterface[] |
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*/ |
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private $middlewareStack = []; |
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/** |
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* Creates a Middleware Stack |
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* |
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* @param MiddlewareInterface[]|callable[] $middlewareStack |
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*/ |
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public function __construct(array $middlewareStack) |
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{ |
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foreach ($middlewareStack as $middleware) { |
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$this->push($middleware); |
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} |
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} |
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/** |
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* Pushes a middleware to the stack |
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* |
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* @param MiddlewareInterface|callable $middleware |
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* |
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* @return MiddlewareStack |
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*/ |
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public function push($middleware) |
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{ |
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if (! $middleware instanceof MiddlewareInterface && |
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! is_callable($middleware) |
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) { |
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throw new InvalidArgumentException( |
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"Middleware stack accepts only MiddlewareInterface object or callable" |
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); |
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} |
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array_push($this->middlewareStack, $middleware); |
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return $this; |
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} |
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/** |
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* Processes all the middleware stack |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return \Psr\Http\Message\ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request) |
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{ |
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$handler = $this->resolve(0); |
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return $handler->handle($request); |
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} |
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/** |
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* Creates a request handler for middleware at the position defined by $index |
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* |
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* @param int $index |
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* |
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* @return RequestHandler |
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* |
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* @throws UnexpectedValueException If the return form a middleware is not a ResponseInterface |
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*/ |
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private function resolve($index) |
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{ |
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return new RequestHandler(function (ServerRequestInterface $request) use ($index) { |
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$middleware = isset($this->middlewareStack[$index]) |
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? $this->middlewareStack[$index] |
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: new CallableMiddleware(function () { |
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}); |
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if ($middleware instanceof \Closure) { |
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$middleware = new CallableMiddleware($middleware); |
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} |
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$response = $middleware->process($request, $this->resolve($index + 1)); |
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if (!($response instanceof ResponseInterface)) { |
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throw new UnexpectedValueException( |
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sprintf('The middleware must return an instance of %s', ResponseInterface::class) |
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); |
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} |
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return $response; |
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}); |
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} |
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} |
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slickframework /
http
