Bolt\Controller\Backend\Authentication::postLogin PHP Method

    public function postLogin(Request $request)
    {
        switch ($request->get('action')) {
            case 'login':
                return $this->handlePostLogin($request);
            case 'reset':
                return $this->handlePostReset($request);
        }
        // Let's not disclose any internal information.
        $this->abort(Response::HTTP_BAD_REQUEST, 'Invalid request');
    }