alltube/classes/LinkHeaderMiddleware.php

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<?php
namespace Alltube;
use Psr\Container\ContainerInterface;
use Slim\Http\Request;
use Slim\Http\Response;
use Slim\Router;
/**
* Class LinkHeaderMiddleware
* @package Alltube
*/
class LinkHeaderMiddleware
{
/**
* @var Router
*/
private $router;
/**
* LinkHeaderMiddleware constructor.
* @param ContainerInterface $container
*/
public function __construct(ContainerInterface $container)
{
$this->router = $container->get('router');
}
/**
* @param Request $request
* @param Response $response
* @param callable $next
* @return mixed
*/
public function __invoke(Request $request, Response $response, callable $next)
{
$response = $response->withHeader(
'Link',
'<' . $this->router->getBasePath() . '/css/style.css>; rel=preload; as=style'
);
return $next($request, $response);
}
}