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<?php |
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declare(strict_types=1); |
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namespace Lit\Nimo\Middlewares; |
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use Lit\Nimo\Handlers\PipeNextHandler; |
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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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/** |
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* Pipe or chain of middlewares. This middleware is designed to run multiple middlewares one by one. |
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*/ |
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class MiddlewarePipe extends AbstractMiddleware |
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{ |
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/** |
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* @var MiddlewareInterface[] |
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*/ |
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protected $stack = []; |
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/** |
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* append $middleware |
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* return $this |
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* note this method would modify $this |
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* |
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* @param MiddlewareInterface $middleware The middleware to be append. |
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* @return $this |
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*/ |
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public function append(MiddlewareInterface $middleware): MiddlewarePipe |
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{ |
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$this->stack[] = $middleware; |
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return $this; |
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} |
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/** |
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* prepend $middleware |
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* return $this |
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* note this method would modify $this |
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* |
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* @param MiddlewareInterface $middleware The middleware to be prepend. |
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* @return $this |
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*/ |
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public function prepend(MiddlewareInterface $middleware): MiddlewarePipe |
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{ |
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array_unshift($this->stack, $middleware); |
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return $this; |
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} |
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protected function main(): ResponseInterface |
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{ |
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return $this->iterate($this->request, 0); |
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} |
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/** |
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* This is a internal method for run one single iteration. |
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* |
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* @internal This is a public method for PipeNextHandler but NOT considered part of public API. |
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* |
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* @param ServerRequestInterface $request The request. |
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* @param int $index Current iteration index. |
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* @return ResponseInterface |
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*/ |
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public function iterate(ServerRequestInterface $request, int $index): ResponseInterface |
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{ |
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if (!isset($this->stack[$index])) { |
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return $this->delegate($request); |
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} |
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return $this->stack[$index]->process($request, new PipeNextHandler($this, $index + 1)); |
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} |
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} |
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LitPHP /
nimo
