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<?php |
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namespace League\Route\Middleware; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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class Runner |
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{ |
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/** |
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* @var callable[] |
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*/ |
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protected $before = []; |
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/** |
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* @var callable[] |
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*/ |
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protected $after = []; |
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/** |
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* @var callable[] |
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*/ |
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protected $queue = []; |
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/** |
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* Whether the queue has been built. |
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* |
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* @var boolean |
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*/ |
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protected $queued = false; |
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/** |
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* Build and invoke a stack of middleware around a specific middleware. |
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* |
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* @param callable $middleware |
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* @param \Psr\Http\Message\ServerRequestInterface $request |
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* @param \Psr\Http\Message\ResponseInterface $response |
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* |
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* @return \Psr\Http\Message\ResponseInterface |
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*/ |
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public function run(callable $middleware, ServerRequestInterface $request, ResponseInterface $response) |
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{ |
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if ($this->queued === false) { |
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$this->buildQueue($middleware); |
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} |
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return $this->next($request, $response); |
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} |
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/** |
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* Next callable to be passed throughout queue. |
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* |
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* @param \Psr\Http\Message\ServerRequestInterface $request |
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* @param \Psr\Http\Message\ResponseInterface $response |
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* |
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* @return \Psr\Http\Message\ResponseInterface |
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*/ |
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public function next(ServerRequestInterface $request, ResponseInterface $response) |
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{ |
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if (empty($this->queue)) { |
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return $response; |
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} |
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$middleware = array_shift($this->queue); |
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return $middleware($request, $response, [$this, 'next']); |
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} |
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/** |
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* Add a middleware to the before queue. |
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* |
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* @param callable $middleware |
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* |
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* @return self |
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*/ |
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public function before(callable $middleware) |
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{ |
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$this->before[] = $middleware; |
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return $this; |
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} |
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/** |
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* Add a middleware to the after queue. |
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* |
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* @param callable $middleware |
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* |
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* @return self |
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*/ |
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public function after(callable $middleware) |
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{ |
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$this->after[] = $middleware; |
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return $this; |
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} |
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/** |
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* Build the queue of middleware. |
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* |
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* @param callable $middleware |
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* |
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* @return void |
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*/ |
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protected function buildQueue(callable $middleware) |
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{ |
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$this->queue = $this->before; |
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$this->queue[] = $middleware; |
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$this->queue = array_merge($this->queue, $this->after); |
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$this->queued = true; |
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} |
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} |
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thephpleague /
route
