func (ctl *RegisterController)Get() {
    userID := ""
    gt := gtsdk.GeetestLib(PrivateKey, CaptchaID)
    status := gt.PreProcess(userID)
    ctl.SetSession(gtsdk.GT_STATUS_SESSION_KEY, status)
    ctl.SetSession("user_id", userID)
    responseStr := gt.GetResponseStr()
    ctl.Ctx.WriteString(responseStr)
}

func (ctl *ValidateController)Post() {
    var result bool
    var respstr string
    gt := gtsdk.GeetestLib(PrivateKey, CaptchaID)
    challenge := ctl.GetString(gtsdk.FN_CHALLENGE)
    validate := ctl.GetString(gtsdk.FN_VALIDATE)
    seccode := ctl.GetString(gtsdk.FN_SECCODE)
    status := ctl.GetSession(gtsdk.GT_STATUS_SESSION_KEY).(int)
    userID := ctl.GetSession("user_id").(string)
    if status == 0 {
        result = gt.FailbackValidate(challenge, validate, seccode)
    } else {
        result = gt.SuccessValidate(challenge, validate, seccode, userID)
    }
    if result {
        respstr = "success"
    } else {
        respstr = "fail"
    }
    ctl.Ctx.WriteString(respstr)
}