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<?php |
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declare(strict_types=1); |
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namespace Northwoods\Broker; |
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use OutOfBoundsException; |
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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 Broker implements |
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MiddlewareInterface, |
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RequestHandlerInterface |
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{ |
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/** @var MiddlewareInterface[] */ |
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private $middleware = []; |
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/** |
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* Add middleware to the end of the stack |
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*/ |
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public function append(MiddlewareInterface ...$middleware): self |
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{ |
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array_push($this->middleware, ...$middleware); |
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return $this; |
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} |
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/** |
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* Add middleware to the beginning of the stack |
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*/ |
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public function prepend(MiddlewareInterface ...$middleware): self |
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{ |
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array_unshift($this->middleware, ...$middleware); |
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return $this; |
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} |
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// RequestHandlerInterface |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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$broker = clone $this; |
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return $broker->nextMiddleware()->process($request, $broker); |
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} |
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// MiddlewareInterface |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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try { |
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return $this->handle($request); |
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} catch (OutOfBoundsException $e) { |
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return $handler->handle($request); |
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} |
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} |
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/** |
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* @throws OutOfBoundsException If no middleware is available |
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*/ |
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private function nextMiddleware(): MiddlewareInterface |
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{ |
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$middleware = array_shift($this->middleware); |
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if ($middleware === null) { |
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throw new OutOfBoundsException("End of middleware stack"); |
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} |
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return $middleware; |
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} |
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} |
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northwoods /
broker
