Flarum\Foundation\Application::config PHP Method

    public function config($key, $default = null)
    {
        return array_get($this->make('flarum.config'), $key, $default);
    }

 /**
  * @param Request $request
  * @return \Psr\Http\Message\ResponseInterface
  */
 public function handle(Request $request)
 {
     $input = $request->getParsedBody();
     if (array_get($input, 'databasePassword') !== $this->app->config('database.password')) {
         return new HtmlResponse('Incorrect database password.', 500);
     }
     $body = fopen('php://temp', 'wb+');
     $input = new StringInput('');
     $output = new StreamOutput($body);
     try {
         $this->command->run($input, $output);
     } catch (Exception $e) {
         return new HtmlResponse($e->getMessage(), 500);
     }
     return new Response($body, 200);
 }