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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Yii\Web; |
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use Psr\Container\ContainerInterface; |
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use Psr\EventDispatcher\EventDispatcherInterface; |
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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\Injector\Injector; |
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use Yiisoft\Yii\Web\Event\AfterMiddleware; |
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use Yiisoft\Yii\Web\Event\BeforeMiddleware; |
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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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* |
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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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ContainerInterface $container, |
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RequestHandlerInterface $nextHandler = null |
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) { |
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$this->container = $container; |
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$this->nextHandler = $nextHandler ?? new NotFoundHandler($container->get(ResponseFactoryInterface::class)); |
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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 ($middleware instanceof MiddlewareInterface) { |
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$this->middlewares[] = $middleware; |
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return $this; |
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} |
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2 |
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if (is_callable($middleware)) { |
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$this->middlewares[] = $this->getCallbackMiddleware($middleware, $this->container); |
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return $this; |
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} |
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throw new \InvalidArgumentException( |
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'Middleware should be either callable or MiddlewareInterface instance. ' . get_class( |
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$middleware |
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) . ' 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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return $this->process($request, $this->nextHandler); |
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} |
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private function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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if ($this->stack === null) { |
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$dispatcher = $this->container->get(EventDispatcherInterface::class); |
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foreach ($this->middlewares as $middleware) { |
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$handler = $this->wrap($middleware, $handler, $dispatcher); |
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} |
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$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( |
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MiddlewareInterface $middleware, |
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RequestHandlerInterface $handler, |
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EventDispatcherInterface $dispatcher |
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): RequestHandlerInterface { |
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return new class($middleware, $handler, $dispatcher) implements RequestHandlerInterface { |
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private MiddlewareInterface $middleware; |
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private RequestHandlerInterface $handler; |
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private EventDispatcherInterface $dispatcher; |
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public function __construct( |
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MiddlewareInterface $middleware, |
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RequestHandlerInterface $handler, |
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EventDispatcherInterface $dispatcher |
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) { |
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$this->middleware = $middleware; |
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$this->handler = $handler; |
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$this->dispatcher = $dispatcher; |
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} |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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$this->dispatcher->dispatch(new BeforeMiddleware($this->middleware, $request)); |
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$response = null; |
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try { |
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return $response = $this->middleware->process($request, $this->handler); |
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} finally { |
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$this->dispatcher->dispatch(new AfterMiddleware($this->middleware, $response)); |
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} |
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} |
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}; |
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} |
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private function getCallbackMiddleware(callable $callback, ContainerInterface $container): MiddlewareInterface |
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{ |
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return new class($callback, $container) implements MiddlewareInterface { |
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/** |
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* @var callable a PHP callback matching signature of [[MiddlewareInterface::process()]]. |
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*/ |
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private $callback; |
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private ContainerInterface $container; |
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public function __construct(callable $callback, ContainerInterface $container) |
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{ |
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$this->callback = $callback; |
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$this->container = $container; |
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1 |
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} |
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public function process( |
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ServerRequestInterface $request, |
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RequestHandlerInterface $handler |
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): ResponseInterface { |
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1 |
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return (new Injector($this->container))->invoke($this->callback, [$request, $handler]); |
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} |
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}; |
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} |
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149
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} |
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yiisoft /
yii-web
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