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<?php declare(strict_types=1); |
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namespace Igni\Network\Http\Middleware; |
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use Igni\Network\Exception\MiddlewareException; |
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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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use SplQueue; |
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/** |
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* Variation of zend stratigility's pipe. |
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*/ |
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class MiddlewarePipe implements MiddlewareInterface, RequestHandlerInterface |
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{ |
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protected $pipeline; |
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public function __construct(SplQueue $pipeline = null) |
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{ |
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$this->pipeline = $pipeline ?: new SplQueue(); |
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} |
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public function __clone() |
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{ |
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$this->pipeline = clone $this->pipeline; |
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} |
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public function __invoke(ServerRequestInterface $request): ResponseInterface |
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{ |
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return $this->handle($request); |
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} |
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/** |
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* De-queues and executes middleware from the top of the cloned pipeline. |
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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 $request): ResponseInterface |
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{ |
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if ($this->pipeline->isEmpty()) { |
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throw MiddlewareException::forEmptyMiddlewarePipeline(); |
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} |
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$pipeline = clone $this; |
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$middleware = $pipeline->pipeline->dequeue(); |
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return $middleware->process($request, $pipeline); |
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} |
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/** |
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* PSR-15 Middleware invocation |
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* |
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* @param ServerRequestInterface $request |
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* @param RequestHandlerInterface $handler |
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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$next = new Next($this->pipeline, $handler); |
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return $next($request); |
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} |
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/** |
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* Attach middleware to the pipeline. |
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* |
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* @param MiddlewareInterface|callable ...$middleware |
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*/ |
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public function add(MiddlewareInterface ...$middleware): void |
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{ |
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foreach ($middleware as $item) { |
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$this->pipeline->enqueue($item); |
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} |
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} |
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} |
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igniphp /
network
