.
*/
declare(strict_types=1);
namespace App\EventSubscriber;
use App\Services\System\UpdateExecutor;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Twig\Environment;
/**
* Blocks all web requests when maintenance mode is enabled during updates.
*/
readonly class MaintenanceModeSubscriber implements EventSubscriberInterface
{
public function __construct(private UpdateExecutor $updateExecutor,
private Environment $twig)
{
}
public static function getSubscribedEvents(): array
{
return [
// High priority to run before other listeners
KernelEvents::REQUEST => ['onKernelRequest', 512], //High priority to run before other listeners
KernelEvents::RESPONSE => ['onKernelResponse', -512] // Low priority to run after other listeners
];
}
public function onKernelRequest(RequestEvent $event): void
{
// Only handle main requests
if (!$event->isMainRequest()) {
return;
}
// Skip if not in maintenance mode
if (!$this->updateExecutor->isMaintenanceMode()) {
return;
}
// Allow CLI requests
if (PHP_SAPI === 'cli') {
return;
}
// Get maintenance info
$maintenanceInfo = $this->updateExecutor->getMaintenanceInfo();
$lockInfo = $this->updateExecutor->getLockInfo();
// Calculate how long the update has been running
$duration = null;
if ($lockInfo && isset($lockInfo['started_at'])) {
try {
$startedAt = new \DateTime($lockInfo['started_at']);
$now = new \DateTime();
$duration = $now->getTimestamp() - $startedAt->getTimestamp();
} catch (\Exception) {
// Ignore date parsing errors
}
}
// Try to render the Twig template, fall back to simple HTML
try {
$content = $this->twig->render('maintenance/maintenance.html.twig', [
'reason' => $maintenanceInfo['reason'] ?? 'Maintenance in progress',
'started_at' => $maintenanceInfo['enabled_at'] ?? null,
'duration' => $duration,
]);
} catch (\Exception) {
// Fallback to simple HTML if Twig fails
$content = $this->getSimpleMaintenanceHtml($maintenanceInfo, $duration);
}
$response = new Response($content, Response::HTTP_SERVICE_UNAVAILABLE);
$response->headers->set('Retry-After', '30');
$response->headers->set('Cache-Control', 'no-store, no-cache, must-revalidate');
$event->setResponse($response);
}
public function onKernelResponse(ResponseEvent $event)
{
// Only handle main requests
if (!$event->isMainRequest()) {
return;
}
// Skip if not in maintenance mode
if (!$this->updateExecutor->isMaintenanceMode()) {
return;
}
// Allow CLI requests
if (PHP_SAPI === 'cli') {
return;
}
//Remove all Content-Security-Policy headers to allow loading resources during maintenance
$response = $event->getResponse();
$response->headers->remove('Content-Security-Policy');
}
/**
* Generate a simple maintenance page HTML without Twig.
*/
private function getSimpleMaintenanceHtml(?array $maintenanceInfo, ?int $duration): string
{
$reason = htmlspecialchars($maintenanceInfo['reason'] ?? 'Update in progress');
$durationText = $duration !== null ? sprintf('%d seconds', $duration) : 'a moment';
return <<
Part-DB - Maintenance
⚙️
Part-DB is Updating
We're making things better. This should only take a moment.
{$reason}
Update running for {$durationText}
This page will automatically refresh every 15 seconds.