Flarum\Foundation\Application::isUpToDate PHP Method

    public function isUpToDate()
    {
        $settings = $this->make('Flarum\\Settings\\SettingsRepositoryInterface');
        try {
            $version = $settings->get('version');
        } finally {
            $isUpToDate = isset($version) && $version === $this->version();
        }
        return $isUpToDate;
    }

 /**
  * {@inheritdoc}
  */
 protected function getMiddleware(Application $app)
 {
     $pipe = new MiddlewarePipe();
     $path = parse_url($app->url(), PHP_URL_PATH);
     $errorDir = __DIR__ . '/../../error';
     if (!$app->isInstalled()) {
         $app->register('Flarum\\Install\\InstallServiceProvider');
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\StartSession'));
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\DispatchRoute', ['routes' => $app->make('flarum.install.routes')]));
         $pipe->pipe($path, new HandleErrors($errorDir, true));
     } elseif ($app->isUpToDate() && !$app->isDownForMaintenance()) {
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\ParseJsonBody'));
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\StartSession'));
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\RememberFromCookie'));
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\AuthenticateWithSession'));
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\SetLocale'));
         event(new ConfigureMiddleware($pipe, $path, $this));
         $pipe->pipe($path, $app->make('Flarum\\Http\\Middleware\\DispatchRoute', ['routes' => $app->make('flarum.forum.routes')]));
         $pipe->pipe($path, new HandleErrors($errorDir, $app->inDebugMode()));
     } else {
         $pipe->pipe($path, function () use($errorDir) {
             return new HtmlResponse(file_get_contents($errorDir . '/503.html', 503));
         });
     }
     return $pipe;
 }