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<?php |
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namespace Yiisoft\Yii\Web; |
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use Psr\Container\ContainerInterface; |
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use Psr\Http\Message\ResponseFactoryInterface; |
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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 Yiisoft\Yii\Web\Middleware\Callback; |
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/** |
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* MiddlewareDispatcher |
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*/ |
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final class MiddlewareDispatcher implements RequestHandlerInterface, MiddlewareInterface |
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{ |
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private $pointer = 0; |
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/** |
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* @var MiddlewareInterface[] |
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*/ |
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private $middlewares = []; |
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/** |
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* @var RequestHandlerInterface|null |
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*/ |
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private $nextHandler; |
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/** |
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* @var ContainerInterface |
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*/ |
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private $container; |
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public function __construct( |
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array $middlewares, |
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ContainerInterface $container, |
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RequestHandlerInterface $nextHandler = null |
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) { |
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if ($middlewares === []) { |
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throw new \InvalidArgumentException('Middlewares should be defined.'); |
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} |
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$this->container = $container; |
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foreach ($middlewares as $middleware) { |
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$this->add($middleware); |
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} |
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$responseFactory = $container->get(ResponseFactoryInterface::class); |
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$this->nextHandler = $nextHandler ?? new NotFoundHandler($responseFactory); |
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} |
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private function addCallable(callable $callback): void |
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{ |
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$this->middlewares[] = new Callback($callback, $this->container); |
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} |
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public function add($middleware): void |
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{ |
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if (is_callable($middleware)) { |
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$this->addCallable($middleware); |
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} elseif ($middleware instanceof MiddlewareInterface) { |
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$this->middlewares[] = $middleware; |
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} else { |
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throw new \InvalidArgumentException('Middleware should be either callable or MiddlewareInterface instance. ' . get_class($middleware) . ' given.'); |
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} |
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} |
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public function dispatch(ServerRequestInterface $request): ResponseInterface |
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{ |
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$this->pointer = 0; |
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return $this->handle($request); |
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} |
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/** |
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* @internal Please use {@see dispatch()} or {@see process()} instead |
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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->isLastMiddlewareCalled()) { |
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if (!$this->nextHandler !== null) { |
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return $this->nextHandler->handle($request); |
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} |
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throw new \LogicException('Middleware stack exhausted'); |
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} |
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1 |
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return $this->middlewares[$this->pointer++]->process($request, $this); |
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} |
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/** |
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* Last middleware in the queue has been called on the request handler |
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*/ |
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private function isLastMiddlewareCalled(): bool |
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{ |
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return $this->pointer === \count($this->middlewares); |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $nextHandler): ResponseInterface |
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{ |
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$this->nextHandler = $nextHandler; |
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return $this->dispatch($request); |
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} |
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} |
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yiisoft /
yii-web
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