我在WebForms应用程序中多次使用reCAPTCHA 。现在我想将它添加到ASP.NET MVC应用程序中。
我在RecaptchaControlMvc中找到了一些好的代码，但令人难以置信的是，我无法找到关于如何使用此控件的单个段落或示例。
我已经在Google reCAPTCHA小组中发帖但它已经死了。
有人能指出一个使用此控件的示例，一个关于如何使用它的段落，或建议一个替代方案吗？
注意：我知道stackoverflow上有类似的问题，但我发现没有讨论如何使用此控件。
答案 0 :(得分：2)
一些代码here
您可以添加如下属性：
[CaptchaValidator]
[AcceptVerbs( HttpVerbs.Post )]
public ActionResult SubmitForm( Int32 id, bool captchaValid )
{
.. Do something here
}
您在视图中渲染验证码：
<%= Html.GenerateCaptcha() %>
是这样的：
public static string GenerateCaptcha( this HtmlHelper helper )
{
var captchaControl = new Recaptcha.RecaptchaControl
{
ID = "recaptcha",
Theme = "blackglass",
PublicKey = -- Put Public Key Here --,
PrivateKey = -- Put Private Key Here --
};
var htmlWriter = new HtmlTextWriter( new StringWriter() );
captchaControl.RenderControl(htmlWriter);
return htmlWriter.InnerWriter.ToString();
}
答案 1 :(得分：1)
这就是我使用ASP.Net MVC和ReCaptcha 3的方式。
<appSettings>
<add key="reCaptchaSiteKey" value="site_key" />
<add key="reCaptchaSecretKey" value="secret_key" />
</appSettings>
namespace ASPNetMVCWithReCaptcha3.Models
{
public class ReCaptchaForm
{
public string Message { get; set; }
}
}
using System;
using System.Web;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Net.Http;
using System.Configuration;
namespace ASPNetMVCWithReCaptcha3.Classes
{
}
在名称空间内添加以下行
public static class GoogleReCaptchaVariables
{
public static string ReCaptchaSiteKey = ConfigurationManager.AppSettings["reCaptchaSiteKey"]?.ToString() ?? string.Empty;
public static string ReCaptchaSecretKey = ConfigurationManager.AppSettings["reCaptchaSecretKey"]?.ToString() ?? string.Empty;
public static string InputName = "g-recaptcha-response";
}
public static class ReCaptchaHelper
{
public static IHtmlString ReCaptchaHidden(this HtmlHelper helper)
{
var mvcHtmlString = new TagBuilder("input")
{
Attributes =
{
new KeyValuePair<string, string>("type", "hidden"),
new KeyValuePair<string, string>
("id", GoogleReCaptchaVariables.InputName),
new KeyValuePair<string, string>
("name", GoogleReCaptchaVariables.InputName)
}
};
string renderedReCaptchaInput =
mvcHtmlString.ToString(TagRenderMode.Normal);
return MvcHtmlString.Create($"{renderedReCaptchaInput}");
}
public static IHtmlString ReCaptchaJS
(this HtmlHelper helper, string useCase = "homepage")
{
string reCaptchaSiteKey = GoogleReCaptchaVariables.ReCaptchaSiteKey;
string reCaptchaApiScript = "<script
src='https://www.google.com/recaptcha/api.js?render=" +
reCaptchaSiteKey + "'></script>;";
string reCaptchaTokenResponseScript = "<script>
$('form').submit(function(e) { e.preventDefault();
grecaptcha.ready(function() { grecaptcha.execute('" +
reCaptchaSiteKey + "', {action: '" + useCase +
"'}).then(function(token) { $('#" +
GoogleReCaptchaVariables.InputName + "').val(token);
$('form').unbind('submit').submit(); }); }); }); </script>;";
return MvcHtmlString.Create
($"{reCaptchaApiScript}{reCaptchaTokenResponseScript}");
}
}
public static IHtmlString ReCaptchaValidationMessage
(this HtmlHelper helper, string errorText = null)
{
var invalidReCaptchaObj =
helper.ViewContext.Controller.TempData["InvalidCaptcha"];
var invalidReCaptcha = invalidReCaptchaObj?.ToString();
if (string.IsNullOrWhiteSpace(invalidReCaptcha))
return MvcHtmlString.Create("");
var buttonTag = new TagBuilder("span")
{
Attributes = {
new KeyValuePair<string, string>("class", "text-danger")
},
InnerHtml = errorText ?? invalidReCaptcha
};
return MvcHtmlString.Create(buttonTag.ToString(TagRenderMode.Normal));
}
public class ValidateReCaptchaAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
string reCaptchaToken =
filterContext.HttpContext.Request.Form[GoogleReCaptchaVariables.InputName];
string reCaptchaResponse = ReCaptchaVerify(reCaptchaToken);
ResponseToken response = new ResponseToken();
if (reCaptchaResponse != null)
{
response = Newtonsoft.Json.JsonConvert.DeserializeObject
(reCaptchaResponse);
}
if (!response.Success)
{
AddErrorAndRedirectToGetAction(filterContext);
}
base.OnActionExecuting(filterContext);
}
public string ReCaptchaVerify(string responseToken)
{
const string apiAddress =
"https://www.google.com/recaptcha/api/siteverify";
string recaptchaSecretKey = GoogleReCaptchaVariables.ReCaptchaSecretKey;
string urlToPost = $"{apiAddress}
?secret={recaptchaSecretKey}&response={responseToken}";
string responseString = null;
using (var httpClient = new HttpClient())
{
try
{
responseString = httpClient.GetStringAsync(urlToPost).Result;
}
catch
{
//Todo: Error handling process goes here
}
}
return responseString;
}
private static void AddErrorAndRedirectToGetAction
(ActionExecutingContext filterContext, string message = null)
{
filterContext.Controller.TempData["InvalidCaptcha"] =
message ?? "Invalid Captcha! The form cannot be submitted.";
filterContext.Result =
new RedirectToRouteResult(filterContext.RouteData.Values);
}
internal class ResponseToken
{
public bool Success { get; set; }
public float Score { get; set; }
public string Action { get; set; }
public DateTime Challenge_TS { get; set; }
public string HostName { get; set; }
public List ErrorCodes { get; set; }
}
}
[HttpPost]
[ValidateAntiForgeryToken]
[ValidateReCaptcha]
public ActionResult Index(ReCaptchaForm form)
{
return View(form);
}
@model ASPNetMVCWithReCaptcha3.Models.ReCaptchaForm
@using ASPNetMVCWithReCaptcha3.Classes;
@{
ViewBag.Title = "ReCaptcha Form";
}
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
@Html.LabelFor(model => model.Message)
@Html.TextAreaFor(model => model.Message, new { @class = "form-control" })
@Html.ReCaptchaValidationMessage()
@Html.ReCaptchaHidden()
@Html.ReCaptchaJS()
<button type="submit" class="btn btn-primary">Send Message</button>
}
答案 2 :(得分：0)
我可以为您提供一种使用google recaptcha的简单替代方法。 在这里，您可以找到有关Google new reCAPTCHA using asp.net mvc
的完整参考资料首先，所有人都需要注册＆amp;生成Google reCAPTCHA API。 转到http://www.google.com/recaptcha，然后点击右上角的“获取reCAPTCHA”按钮
其次，在您的视图中编写HTML代码。在此处替换文字“您的网站密钥”
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<div>
@using (Html.BeginForm("FormSubmit", "Home", FormMethod.Post))
{
<div class="g-recaptcha" data-sitekey="Your sitekey here"></div>
<input type="submit" value="Submit" />
}
</div>
<span style="display:inline-block; font-size:20px;margin:20px 0;padding:20px;border:1px solid #D3D3D3">
@ViewBag.Message
</span>
<script src='https://www.google.com/recaptcha/api.js' type="text/javascript"></script>
第3个也是最后一个，编写验证谷歌reCaptcha的行动代码
[HttpPost]
public ActionResult FormSubmit()
{
//Validate Google recaptcha here
var response = Request["g-recaptcha-response"];
string secretKey = "Your secret here";
var client = new WebClient();
var result = client.DownloadString(string.Format("https://www.google.com/recaptcha/api/siteverify?secret={0}&response={1}", secretKey, response));
var obj = JObject.Parse(result);
var status = (bool)obj.SelectToken("success");
ViewBag.Message = status ? "Google reCaptcha validation success" : "Google reCaptcha validation failed";
//When you will post form for save data, you should check both the model validation and google recaptcha validation
//EX.
/* if (ModelState.IsValid && status)
{
}*/
//Here I am returning to Index page for demo perpose, you can use your view here
return View("Index");
}