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<?php
namespace Engelsystem\Middleware;
use Engelsystem\Application;
use InvalidArgumentException;
use LogicException;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
class Dispatcher implements MiddlewareInterface, RequestHandlerInterface
{
use ResolvesMiddlewareTrait;
/** @var MiddlewareInterface[]|string[] */
protected $stack;
/** @var Application */
protected $container;
/** @var RequestHandlerInterface */
protected $next;
/**
* @param MiddlewareInterface[]|string[] $stack
* @param Application|null $container
*/
public function __construct($stack = [], Application $container = null)
{
$this->stack = $stack;
$this->container = $container;
}
/**
* Process an incoming server request and return a response, optionally delegating
* response creation to a handler.
*
* Could be used to group middleware
*
* @param ServerRequestInterface $request
* @param RequestHandlerInterface $handler
* @return ResponseInterface
*/
public function process(
ServerRequestInterface $request,
RequestHandlerInterface $handler
): ResponseInterface {
$this->next = $handler;
return $this->handle($request);
}
/**
* Handle the request and return a response.
*
* It calls all configured middleware and handles their response
*
* @param ServerRequestInterface $request
* @return ResponseInterface
*/
public function handle(ServerRequestInterface $request): ResponseInterface
{
$middleware = array_shift($this->stack);
if (!$middleware) {
if ($this->next) {
return $this->next->handle($request);
}
throw new LogicException('Middleware queue is empty');
}
$middleware = $this->resolveMiddleware($middleware);
if (!$middleware instanceof MiddlewareInterface) {
throw new InvalidArgumentException('Middleware is no instance of ' . MiddlewareInterface::class);
}
return $middleware->process($request, $this);
}
/**
* @param Application $container
*/
public function setContainer(Application $container)
{
$this->container = $container;
}
}
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