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<?php |
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namespace Simply\Application\Handler; |
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use Psr\Http\Message\ResponseInterface as Response; |
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use Psr\Http\Message\ServerRequestInterface as Request; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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/** |
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* A middleware stack that acts like a request handler. |
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* @author Riikka Kalliomäki <[email protected]> |
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* @copyright Copyright (c) 2018 Riikka Kalliomäki |
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* @license http://opensource.org/licenses/mit-license.php MIT License |
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*/ |
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class MiddlewareHandler implements RequestHandlerInterface |
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{ |
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/** @var MiddlewareInterface[] List of middleware instances to call */ |
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private $stack; |
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/** @var RequestHandlerInterface The fallback request handler */ |
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private $fallback; |
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/** |
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* MiddlewareHandler constructor. |
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* @param RequestHandlerInterface $fallback The fallback request handler to call |
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*/ |
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public function __construct(RequestHandlerInterface $fallback) |
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{ |
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$this->stack = []; |
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$this->fallback = $fallback; |
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} |
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/** |
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* Adds a new middleware to the stack. |
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* @param MiddlewareInterface $middleware Additional middleware to add to the stack |
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*/ |
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public function push(MiddlewareInterface $middleware): void |
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{ |
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$this->stack[] = $middleware; |
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} |
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/** {@inheritdoc} */ |
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public function handle(Request $request): Response |
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{ |
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$stack = $this->stack; |
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$handler = new CallbackHandler(function (Request $request) use (& $stack, & $handler): Response { |
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$middleware = array_shift($stack); |
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if ($middleware instanceof MiddlewareInterface) { |
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return $middleware->process($request, $handler); |
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} |
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return $this->fallback->handle($request); |
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}); |
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return $handler->handle($request); |
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} |
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} |
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simply-framework /
application
