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<?php |
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/** |
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* This file is part of the Shieldon package. |
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* |
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* (c) Terry L. <[email protected]> |
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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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declare(strict_types=1); |
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namespace Shieldon\Psr15; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Shieldon\Psr7\Response; |
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/** |
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* PSR-15 Middleware |
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*/ |
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class RequestHandler implements RequestHandlerInterface |
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{ |
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/** |
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* Middlewares in the queue are ready to run. |
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* |
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* @var array |
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*/ |
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protected $queue = []; |
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/** |
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* After the last middleware has been called, a fallback handler should |
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* parse the request and give an appropriate response. |
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* |
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* @var RequestHandlerInterface|null |
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*/ |
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protected $fallbackHandler = null; |
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/** |
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* RequestHandler constructor. |
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* |
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* @param RequestHandler|null $finalRequestHandler A valid resource. |
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*/ |
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public function __construct(?RequestHandlerInterface $fallbackHandler = null) |
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{ |
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if ($fallbackHandler instanceof RequestHandlerInterface) { |
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$this->fallbackHandler = $fallbackHandler; |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function add(MiddlewareInterface $middleware) |
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{ |
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$this->queue[] = $middleware; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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if (0 === count($this->queue)) { |
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return $this->final($request); |
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} |
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$middleware = array_shift($this->queue); |
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return $middleware->process($request, $this); |
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} |
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/** |
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* This is the final, there is no middleware needed to execute, pasre the |
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* layered request and give a parsed response. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return ResponseInterface |
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*/ |
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protected function final(ServerRequestInterface $request): ResponseInterface |
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{ |
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if (!$this->fallbackHandler) { |
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return new Response(); |
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} |
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return $this->fallbackHandler->handle($request); |
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} |
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} |
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terrylinooo /
psr-http
