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<?php
namespace Engelsystem\Middleware;
use Engelsystem\Http\Response;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Twig_LoaderInterface as TwigLoader;
class ErrorHandler implements MiddlewareInterface
{
/** @var TwigLoader */
protected $loader;
/** @var string */
protected $viewPrefix = 'errors/';
/**
* @param TwigLoader $loader
*/
public function __construct(TwigLoader $loader)
{
$this->loader = $loader;
}
/**
* Handles any error messages
*
* Should be added at the beginning
*
* @param ServerRequestInterface $request
* @param RequestHandlerInterface $handler
* @return ResponseInterface
*/
public function process(
ServerRequestInterface $request,
RequestHandlerInterface $handler
): ResponseInterface {
$response = $handler->handle($request);
$statusCode = $response->getStatusCode();
if ($statusCode < 400 || !$response instanceof Response) {
return $response;
}
$view = $this->selectView($statusCode);
return $response->withView(
$this->viewPrefix . $view,
[
'status' => $statusCode,
'content' => $response->getContent(),
],
$statusCode,
$response->getHeaders()
);
}
/**
* Select a view based on the given status code
*
* @param int $statusCode
* @return string
*/
protected function selectView(int $statusCode): string
{
$hundreds = intdiv($statusCode, 100);
$viewsList = [$statusCode, $hundreds, $hundreds * 100];
foreach ($viewsList as $view) {
if ($this->loader->exists($this->viewPrefix . $view)) {
return $view;
}
}
return 'default';
}
}
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