private void loginWithToken(EzyUserLoginEvent event, String token) {
    logger.info("handle user login in with token");
    try {
        byte[] usernameBytes = EzyAesCrypt.getDefault().decrypt(
            EzyBase64.decode(token),
            CommonConstants.TOKEN_ENCRYPTION_KEY.getBytes()
        );
        String username = new String(usernameBytes);
        event.setUsername(username);
    } catch (Exception e) {
        throw new EzyLoginErrorException(EzyLoginError.INVALID_TOKEN);
    }
}

private String getAccessToken(EzyUserLoginEvent event) {
    Object loginData = event.getData();
    if (loginData instanceof EzyObject) {
        return ((EzyObject) loginData).get("accessToken", String.class);
    }
    return null;
}