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<?php |
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namespace mindplay\middleman; |
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use LogicException; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* PSR-7 middleware dispatcher |
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*/ |
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class Dispatcher implements MiddlewareInterface |
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{ |
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/** |
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* @var callable middleware resolver |
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*/ |
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private $resolver; |
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/** |
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* @var mixed[] unresolved middleware stack |
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*/ |
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private $stack; |
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/** |
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* @var (callable|MiddlewareInterface)[] resolved middleware stack |
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*/ |
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private $resolved = []; |
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/** |
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* @param (callable|MiddlewareInterface|mixed)[] $stack middleware stack |
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* @param callable|null $resolver optional middleware resolver |
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*/ |
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public function __construct(array $stack, callable $resolver = null) |
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{ |
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$this->stack = $stack; |
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$this->resolver = $resolver; |
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} |
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/** |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* |
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* @return ResponseInterface |
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*/ |
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public function dispatch(RequestInterface $request, ResponseInterface $response) |
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{ |
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$resolved = $this->resolve(0); |
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return $resolved($request, $response); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function __invoke(RequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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return $next($request, $this->dispatch($request, $response)); |
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} |
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/** |
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* @param int $index middleware stack index |
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* |
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* @return callable function (RequestInterface $request, ResponseInterface $response): ResponseInterface |
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*/ |
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private function resolve($index) |
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{ |
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if (isset($this->stack[$index])) { |
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return function (RequestInterface $request, ResponseInterface $response) use ($index) { |
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if (!isset($this->resolved[$index])) { |
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$this->resolved[$index] = $this->resolver |
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? call_user_func($this->resolver, $this->stack[$index]) |
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: $this->stack[$index]; // as-is |
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} |
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$middleware = $this->resolved[$index]; |
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$result = $middleware($request, $response, $this->resolve($index + 1)); |
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if (!$result instanceof ResponseInterface) { |
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throw new LogicException("unexpected middleware result"); |
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} |
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return $result; |
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}; |
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} |
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return function (RequestInterface $request, ResponseInterface $response) { |
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return $response; |
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}; |
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} |
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} |
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mindplay-dk /
middleman
