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<?php |
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/* |
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* This file is part of the slince/middleware package. |
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* |
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* (c) Slince <[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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namespace Slince\Middleware; |
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use Interop\Http\Server\MiddlewareInterface; |
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use Interop\Http\Server\RequestHandlerInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Slince\Middleware\Exception\MissingResponseException; |
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class Dispatcher |
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{ |
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/** |
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* @var \SplQueue |
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*/ |
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public $middlewares; |
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public function __construct($middlewares = []) |
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{ |
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$this->middlewares = new \SplQueue(); |
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foreach ((array) $middlewares as $middleware) { |
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$this->push($middleware); |
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} |
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} |
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/** |
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* Add a middleware to the queue. |
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* |
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* @param callable|MiddlewareInterface $middleware |
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*/ |
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public function push($middleware) |
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{ |
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if (is_callable($middleware)) { |
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$middleware = static::decorateCallableMiddleware($middleware); |
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} |
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$this->middlewares->enqueue($middleware); |
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} |
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/** |
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* Get all middlewares. |
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* |
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* @return MiddlewareInterface[] |
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*/ |
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public function all() |
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{ |
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$middlewares = []; |
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foreach ($this->middlewares as $middleware) { |
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$middlewares[] = $middleware; |
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} |
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return $middlewares; |
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} |
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/** |
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* Dispatch the request to the middlewares and get psr7 response. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @throws MissingResponseException |
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* |
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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request): ResponseInterface |
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{ |
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$response = $this->resolve()->handle($request); |
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if (!$response instanceof ResponseInterface) { |
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throw new MissingResponseException('Last middleware executed did not return a response.'); |
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} |
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return $response; |
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} |
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/** |
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* @return Delegate |
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*/ |
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protected function resolve(): RequestHandlerInterface |
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{ |
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return new Delegate(function($request){ |
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if (!$this->middlewares->isEmpty()) { |
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$middleware = $this->middlewares->dequeue(); |
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$response = $middleware->process($request, $this->resolve()); |
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if (!$response instanceof ResponseInterface) { |
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throw new MissingResponseException(sprintf('Unexpected middleware result: %s', gettype($response))); |
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} |
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return $response; |
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} else { |
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throw new MissingResponseException( 'The queue was exhausted, with no response returned'); |
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} |
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}); |
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} |
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protected static function decorateCallableMiddleware(callable $middleware): CallableMiddleware |
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{ |
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return new CallableMiddleware($middleware); |
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} |
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} |
slince /
middleware
