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<?php
namespace Engelsystem\Middleware;
use Engelsystem\Http\Request;
use FastRoute\Dispatcher as FastRouteDispatcher;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
class RouteDispatcher implements MiddlewareInterface
{
/** @var FastRouteDispatcher */
protected $dispatcher;
/** @var ResponseInterface */
protected $response;
/** @var MiddlewareInterface|null */
protected $notFound;
/**
* @param FastRouteDispatcher $dispatcher
* @param ResponseInterface $response Default response
* @param MiddlewareInterface|null $notFound Handles any requests if the route can't be found
*/
public function __construct(
FastRouteDispatcher $dispatcher,
ResponseInterface $response,
MiddlewareInterface $notFound = null
) {
$this->dispatcher = $dispatcher;
$this->response = $response;
$this->notFound = $notFound;
}
/**
* Process an incoming server request and return a response, optionally delegating
* response creation to a handler.
*
* @param ServerRequestInterface $request
* @param RequestHandlerInterface $handler
* @return ResponseInterface
*/
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
{
$path = $request->getUri()->getPath();
if ($request instanceof Request) {
$path = $request->getPathInfo();
}
$path = urldecode($path);
$route = $this->dispatcher->dispatch($request->getMethod(), $path);
$status = $route[0];
if ($status == FastRouteDispatcher::NOT_FOUND) {
if ($this->notFound instanceof MiddlewareInterface) {
return $this->notFound->process($request, $handler);
}
return $this->response->withStatus(404);
}
if ($status == FastRouteDispatcher::METHOD_NOT_ALLOWED) {
$methods = $route[1];
return $this->response
->withStatus(405)
->withHeader('Allow', implode(', ', $methods));
}
$routeHandler = $route[1];
$request = $request->withAttribute('route-request-handler', $routeHandler);
$request = $request->withAttribute('route-request-path', $path);
$vars = $route[2];
foreach ($vars as $name => $value) {
$request = $request->withAttribute($name, $value);
}
return $handler->handle($request);
}
}
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