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<?php |
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namespace Equip\Dispatch; |
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use Interop\Http\Middleware\DelegateInterface; |
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use Interop\Http\Middleware\ServerMiddlewareInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\RequestInterface; |
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class Stack implements DelegateInterface |
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{ |
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/** |
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* @var callable |
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*/ |
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private $default; |
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/** |
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* @var array |
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*/ |
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private $middleware = []; |
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/** |
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* @var integer |
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*/ |
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private $index = 0; |
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/** |
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* @param callable $default to call when no middleware is available |
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* @param array $middleware |
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*/ |
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public function __construct(callable $default, ...$middleware) |
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{ |
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$this->default = $default; |
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$this->middleware = $middleware; |
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} |
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/** |
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* Add a middleware to the end of the stack. |
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* |
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* @param ServerMiddlewareInterface $middleware |
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* |
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* @return void |
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*/ |
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public function append(ServerMiddlewareInterface $middleware) |
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{ |
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array_push($this->middleware, $middleware); |
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} |
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/** |
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* Add a middleware to the beginning of the stack. |
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* |
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* @param ServerMiddlewareInterface $middleware |
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* |
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* @return void |
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*/ |
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public function prepend(ServerMiddlewareInterface $middleware) |
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{ |
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array_unshift($this->middleware, $middleware); |
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} |
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/** |
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* Process the request using the current middleware. |
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* |
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* @param RequestInterface $request |
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* |
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* @return ResponseInterface |
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*/ |
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public function process(RequestInterface $request) |
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{ |
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if (empty($this->middleware[$this->index])) { |
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return call_user_func($this->default, $request); |
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} |
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return $this->middleware[$this->index]->process($request, $this->nextDelegate()); |
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} |
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/** |
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* Get a delegate pointing to the next middleware. |
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* |
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* @return static |
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*/ |
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private function nextDelegate() |
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{ |
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$copy = clone $this; |
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$copy->index++; |
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return $copy; |
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} |
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/** |
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* Dispatch the middleware stack. |
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* |
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* @param RequestInterface $request |
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* |
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* @return ResponseInterface |
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*/ |
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public function dispatch(RequestInterface $request) |
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{ |
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return $this->process($request); |
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} |
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} |
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equip /
dispatch
