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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Middleware\Dispatcher; |
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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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final class MiddlewareDispatcher |
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{ |
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/** |
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* Contains a stack of middleware handler. |
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* |
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* @var MiddlewareStackInterface stack of middleware |
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*/ |
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private MiddlewareStackInterface $stack; |
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private MiddlewareFactoryInterface $middlewareFactory; |
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/** |
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* @var array[]|callable[]|string[] |
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*/ |
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private array $middlewareDefinitions = []; |
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public function __construct(MiddlewareFactoryInterface $middlewareFactory, MiddlewareStackInterface $stack) |
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{ |
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$this->middlewareFactory = $middlewareFactory; |
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$this->stack = $stack; |
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} |
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public function dispatch(ServerRequestInterface $request, RequestHandlerInterface $fallbackHandler): ResponseInterface |
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{ |
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if ($this->stack->isEmpty()) { |
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$this->stack = $this->stack->build($this->buildMiddlewares(), $fallbackHandler); |
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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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* Returns new instance with middleware handlers replaced. |
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* Last specified handler will be executed first. |
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* |
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* @param array[]|callable[]|string[] $middlewareDefinitions Each array element is a name of PSR-15 middleware, |
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* a callable with `function(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface` |
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* signature or a handler action (an array of [handlerClass, handlerMethod]). For handler action and callable |
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* typed parameters are automatically injected using dependency injection container passed to the route. |
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* Current request and handler could be obtained by type-hinting for {@see ServerRequestInterface} |
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* and {@see RequestHandlerInterface}. |
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* |
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* @return self |
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*/ |
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public function withMiddlewares(array $middlewareDefinitions): self |
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{ |
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$clone = clone $this; |
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$clone->middlewareDefinitions = $middlewareDefinitions; |
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$clone->stack->reset(); |
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return $clone; |
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} |
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public function hasMiddlewares(): bool |
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{ |
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return $this->middlewareDefinitions !== []; |
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} |
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/** |
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* @return MiddlewareInterface[] |
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*/ |
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private function buildMiddlewares(): array |
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{ |
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$middlewares = []; |
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foreach ($this->middlewareDefinitions as $middlewareDefinition) { |
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$middlewares[] = $this->middlewareFactory->create($middlewareDefinition); |
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} |
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return $middlewares; |
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} |
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} |
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yiisoft /
middleware-dispatcher
