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<?php
namespace TheCodingMachine\CMS\Middleware;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use TheCodingMachine\CMS\Block\BlockRenderer;
use TheCodingMachine\CMS\Block\CacheableBlock;
use TheCodingMachine\CMS\Page\PageRegistryInterface;
use Zend\Diactoros\Response;
class CMSMiddleware implements MiddlewareInterface
{
/**
* @var PageRegistryInterface
*/
private $pageRegistry;
* @var BlockRenderer
private $blockRenderer;
public function __construct(PageRegistryInterface $pageRegistry, BlockRenderer $blockRenderer)
$this->pageRegistry = $pageRegistry;
$this->blockRenderer = $blockRenderer;
}
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
// Let's only deal with GET requests.
if ($request->getMethod() !== 'GET') {
return $handler->handle($request);
$page = $this->pageRegistry->getPage($request);
if ($page === null) {
$stream = $this->blockRenderer->renderBlock($page);
$response = new Response($stream);
if ($page instanceof CacheableBlock) {
$response = $response->withHeader('Expires', gmdate('D, d M Y H:i:s T', time() + $page->getTtl()));
return $response;