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<?php
declare(strict_types=1);
namespace Northwoods\Middleware;
use InvalidArgumentException;
use Psr\Container\ContainerInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
class LazyMiddleware implements MiddlewareInterface
{
/** @var ContainerInterface */
private $container;
/** @var string */
private $middleware;
public function __construct(ContainerInterface $container, string $middleware)
if (! is_subclass_of($middleware, MiddlewareInterface::class, true)) {
throw new InvalidArgumentException(
sprintf('%s does not implement %s', $middleware, MiddlewareInterface::class)
);
}
$this->container = $container;
$this->middleware = $middleware;
// MiddlewareInterface
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
return $this->resolve()->process($request, $handler);
private function resolve(): MiddlewareInterface
return $this->container->get($this->middleware);
northwoods /
lazy-middleware
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