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<?php |
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declare(strict_types = 1); |
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namespace Middleland; |
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use Closure; |
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use Interop\Http\Server\MiddlewareInterface; |
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use Interop\Http\Server\RequestHandlerInterface; |
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use InvalidArgumentException; |
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use LogicException; |
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use Psr\Container\ContainerInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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class Dispatcher implements MiddlewareInterface, RequestHandlerInterface |
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{ |
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/** |
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* @var MiddlewareInterface[] |
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*/ |
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private $middleware; |
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/** |
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* @var ContainerInterface|null |
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*/ |
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private $container; |
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/** |
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* @var RequestHandlerInterface|null |
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*/ |
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private $next; |
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/** |
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* @param MiddlewareInterface[] $middleware |
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*/ |
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public function __construct(array $middleware, ContainerInterface $container = null) |
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{ |
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if (empty($middleware)) { |
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throw new LogicException('Empty middleware queue'); |
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} |
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$this->middleware = $middleware; |
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$this->container = $container; |
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} |
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/** |
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* Magic method to execute the dispatcher as a callable |
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*/ |
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public function __invoke(ServerRequestInterface $request): ResponseInterface |
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{ |
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return $this->dispatch($request); |
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} |
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/** |
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* Return the current or next available middleware frame in the middleware. |
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* |
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* @return MiddlewareInterface|false |
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*/ |
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private function get(ServerRequestInterface $request, bool $next = false) |
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{ |
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$frame = $next ? next($this->middleware) : current($this->middleware); |
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if ($frame === false) { |
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return $frame; |
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} |
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if (is_array($frame)) { |
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$conditions = $frame; |
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$frame = array_pop($conditions); |
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foreach ($conditions as $condition) { |
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if ($condition === true) { |
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continue; |
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} |
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if ($condition === false) { |
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return $this->get($request, true); |
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} |
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if (is_string($condition)) { |
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$condition = new Matchers\Path($condition); |
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} elseif (!is_callable($condition)) { |
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throw new InvalidArgumentException('Invalid matcher. Must be a boolean, string or a callable'); |
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} |
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if (!$condition($request)) { |
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return $this->get($request, true); |
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} |
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} |
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} |
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if (is_string($frame)) { |
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if ($this->container === null) { |
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throw new InvalidArgumentException(sprintf('No valid middleware provided (%s)', $frame)); |
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} |
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$frame = $this->container->get($frame); |
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} |
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if ($frame instanceof Closure) { |
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return self::createMiddlewareFromClosure($frame); |
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} |
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if ($frame instanceof MiddlewareInterface) { |
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return $frame; |
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} |
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throw new InvalidArgumentException(sprintf('No valid middleware provided (%s)', is_object($frame) ? get_class($frame) : gettype($frame))); |
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} |
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/** |
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* Dispatch the request, return a response. |
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*/ |
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public function dispatch(ServerRequestInterface $request): ResponseInterface |
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{ |
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reset($this->middleware); |
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return $this->get($request)->process($request, $this); |
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} |
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/** |
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* @see RequestHandlerInterface |
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*/ |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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$frame = $this->get($request, true); |
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if ($frame === false) { |
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if ($this->next !== null) { |
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return $this->next->handle($request); |
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} |
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throw new LogicException('Middleware queue exhausted'); |
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} |
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return $frame->process($request, $this); |
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} |
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/** |
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* @see MiddlewareInterface |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $next): ResponseInterface |
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{ |
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$this->next = $next; |
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return $this->dispatch($request); |
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} |
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/** |
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* Create a middleware from a closure |
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*/ |
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private static function createMiddlewareFromClosure(Closure $handler): MiddlewareInterface |
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{ |
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return new class($handler) implements MiddlewareInterface { |
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private $handler; |
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public function __construct(Closure $handler) |
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{ |
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$this->handler = $handler; |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $next): ResponseInterface |
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{ |
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return call_user_func($this->handler, $request, $next); |
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} |
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}; |
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} |
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} |
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oscarotero /
middleland
