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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 |
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{ |
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/** |
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* @var MiddlewareInterface[] |
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*/ |
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private array $middlewares = []; |
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private RequestHandlerInterface $nextHandler; |
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private ContainerInterface $container; |
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/** |
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* Contains a chain of middleware wrapped in handlers. |
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* Each handler points to the handler of middleware that will be processed next. |
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* @var RequestHandlerInterface|null stack of middleware |
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*/ |
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private ?RequestHandlerInterface $stack = null; |
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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 = $container; |
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for ($i = count($middlewares) - 1; $i >= 0; $i--) { |
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$this->addMiddleware($middlewares[$i]); |
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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 $callback): void |
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{ |
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array_unshift($this->middlewares, new Callback($callback, $this->container)); |
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} |
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/** |
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* @param callable|MiddlewareInterface $middleware |
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* @return self |
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*/ |
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public function addMiddleware($middleware): self |
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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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array_unshift($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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return $this; |
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} |
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public function dispatch(ServerRequestInterface $request): ResponseInterface |
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{ |
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return $this->process($request, $this->nextHandler); |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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if ($this->stack === null) { |
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for ($i = count($this->middlewares) - 1; $i >= 0; $i--) { |
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$handler = $this->wrap($this->middlewares[$i], $handler); |
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} |
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$this->stack = $handler; |
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} |
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return $this->stack->handle($request); |
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} |
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/** |
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* Wraps handler by middlewares |
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*/ |
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private function wrap(MiddlewareInterface $middleware, RequestHandlerInterface $handler): RequestHandlerInterface |
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{ |
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return new class($middleware, $handler) implements RequestHandlerInterface { |
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private MiddlewareInterface $middleware; |
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private RequestHandlerInterface $handler; |
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public function __construct(MiddlewareInterface $middleware, RequestHandlerInterface $handler) |
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{ |
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$this->middleware = $middleware; |
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$this->handler = $handler; |
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} |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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return $this->middleware->process($request, $this->handler); |
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} |
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}; |
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} |
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} |
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yiisoft /
yii-web
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