Question

如果我们可以实施，如何验证用户响应？

这是我的代码

<script type="text/javascript" src="https://www.google.com/recaptcha/api/challenge?k=<Public Key>"></script>
<noscript>
               <iframe src="https://www.google.com/recaptcha/api/noscript?k=<Public Key>" height="300" width="500" frameborder="0"></iframe><br>
               <textarea name="recaptcha_challenge_field"></textarea>
               <input type="hidden" name="recaptcha_response_field" value="manual_challenge">
</noscript>

Answer 1

你可以有一个类，如

public class GoogleReCaptcha
{
    [JsonProperty("success")]
    public bool Success { get; set; }
    [JsonProperty("error-codes")]
    public List<string> ErrorCodes { get; set; }
}

以及controller调用的服务类中的方法，例如：

public bool ValidateReCaptcha(ModelStateDictionary modelState)
    {
        var response = HttpContext.Current.Request["g-recaptcha-response"];

        var client = new WebClient();
        var reply =
            client.DownloadString(
                string.Format("https://www.google.com/recaptcha/api/siteverify?secret={0}&response={1}", ApplicationManager.GoogleRecaptchaSecret, response));

        var captchaResponse = JsonConvert.DeserializeObject<GoogleReCaptcha>(reply);

        if (!captchaResponse.Success)
        {
            if (captchaResponse.ErrorCodes.Count <= 0)
                throw new Exception("Re-Captcha Returned False for Success Without any Error Codes");

            switch (captchaResponse.ErrorCodes[0].ToLower())
            {
                case ("missing-input-secret"):
                    throw new Exception("Re-Captcha Secret Parameter is Missing");

                case ("invalid-input-secret"):
                    throw new Exception("Re-Captcha Secret Parameter is Invalid or Malformed");

                case ("missing-input-response"):
                    modelState.AddModelError("", "Capthca error, retry!.");
                    break;

                case ("invalid-input-response"):
                    modelState.AddModelError("", "Captcha error, retry!");
                    break;

                default:
                    modelState.AddModelError("", "Captcha error, retry!");
                    break;
            }
            return false;
        }
        return true;
    }

您可以在POST控制器操作中调用您的方法，例如：

if (!SomeService.ValidateReCaptcha(ModelState))
    return View(model);

我可以在asp.net mvc 4中实现google reCAPTCHA 1.0版（旧版）吗？

1 个答案: