Geo*_*ker 79
有几个很好的例子:
这个Stack Overflow问题之前也已经介绍过了.
NuGet 谷歌reCAPTCHA V2 for MVC 4和5
Mag*_*pie 31
我已将reCaptcha添加到我正在处理的项目中.我需要它来使用AJAX API,因为reCaptcha元素已动态加载到页面中.我找不到任何现有的控件,API很简单,所以我创建了自己的控件.
我会在这里发布我的代码,万一有人发现它有用.
1:将脚本标记添加到母版页标题中
<script type="text/javascript" src="http://www.google.com/recaptcha/api/js/recaptcha_ajax.js"></script>
2:将密钥添加到web.config
<appSettings>
<add key="ReCaptcha.PrivateKey" value="[key here]" />
<add key="ReCaptcha.PublicKey" value="[key here]" />
</appSettings>
3:创建Action Attribute和Html Helper扩展
namespace [Your chosen namespace].ReCaptcha
{
public enum Theme { Red, White, BlackGlass, Clean }
[Serializable]
public class InvalidKeyException : ApplicationException
{
public InvalidKeyException() { }
public InvalidKeyException(string message) : base(message) { }
public InvalidKeyException(string message, Exception inner) : base(message, inner) { }
}
public class ReCaptchaAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
var userIP = filterContext.RequestContext.HttpContext.Request.UserHostAddress;
var privateKey = ConfigurationManager.AppSettings.GetString("ReCaptcha.PrivateKey", "");
if (string.IsNullOrWhiteSpace(privateKey))
throw new InvalidKeyException("ReCaptcha.PrivateKey missing from appSettings");
var postData = string.Format("&privatekey={0}&remoteip={1}&challenge={2}&response={3}",
privateKey,
userIP,
filterContext.RequestContext.HttpContext.Request.Form["recaptcha_challenge_field"],
filterContext.RequestContext.HttpContext.Request.Form["recaptcha_response_field"]);
var postDataAsBytes = Encoding.UTF8.GetBytes(postData);
// Create web request
var request = WebRequest.Create("http://www.google.com/recaptcha/api/verify");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postDataAsBytes.Length;
var dataStream = request.GetRequestStream();
dataStream.Write(postDataAsBytes, 0, postDataAsBytes.Length);
dataStream.Close();
// Get the response.
var response = request.GetResponse();
using (dataStream = response.GetResponseStream())
{
using (var reader = new StreamReader(dataStream))
{
var responseFromServer = reader.ReadToEnd();
if (!responseFromServer.StartsWith("true"))
((Controller)filterContext.Controller).ModelState.AddModelError("ReCaptcha", "Captcha words typed incorrectly");
}
}
}
}
public static class HtmlHelperExtensions
{
public static MvcHtmlString GenerateCaptcha(this HtmlHelper helper, Theme theme, string callBack = null)
{
const string htmlInjectString = @"<div id=""recaptcha_div""></div>
<script type=""text/javascript"">
Recaptcha.create(""{0}"", ""recaptcha_div"", {{ theme: ""{1}"" {2}}});
</script>";
var publicKey = ConfigurationManager.AppSettings.GetString("ReCaptcha.PublicKey", "");
if (string.IsNullOrWhiteSpace(publicKey))
throw new InvalidKeyException("ReCaptcha.PublicKey missing from appSettings");
if (!string.IsNullOrWhiteSpace(callBack))
callBack = string.Concat(", callback: ", callBack);
var html = string.Format(htmlInjectString, publicKey, theme.ToString().ToLower(), callBack);
return MvcHtmlString.Create(html);
}
}
}
4:将验证码添加到视图中
@using (Html.BeginForm("MyAction", "MyController"))
{
@Html.TextBox("EmailAddress", Model.EmailAddress)
@Html.GenerateCaptcha(Theme.White)
<input type="submit" value="Submit" />
}
5:将属性添加到您的操作中
[HttpPost]
[ReCaptcha]
public ActionResult MyAction(MyModel model)
{
if (!ModelState.IsValid) // Will have a Model Error "ReCaptcha" if the user input is incorrect
return Json(new { capthcaInvalid = true });
... other stuff ...
}
6:请注意,即使有效且表单的其他部分无效,您也需要在每个帖子后重新加载验证码.使用Recaptcha.reload();
Moj*_*oji 12
简单而完整的解决方案为我工作.支持ASP.NET MVC 4和5(支持ASP.NET 4.0,4.5和4.5.1)
步骤1:通过" Install-Package reCAPTCH.MVC " 安装NuGet包
第2步:将公钥和私钥添加到appsettings部分的web.config文件中
<appSettings>
<add key="ReCaptchaPrivateKey" value=" -- PRIVATE_KEY -- " />
<add key="ReCaptchaPublicKey" value=" -- PUBLIC KEY -- " />
</appSettings>
您可以在https://www.google.com/recaptcha/intro/index.html 上为您的网站创建API密钥对,然后点击页面顶部的获取reCAPTCHA
第3步:修改您的表单以包含reCaptcha
@using reCAPTCHA.MVC
@using (Html.BeginForm())
{
@Html.Recaptcha()
@Html.ValidationMessage("ReCaptcha")
<input type="submit" value="Register" />
}
第4步:实现将处理表单提交和Captcha验证的Controller Action
[CaptchaValidator(
PrivateKey = "your private reCaptcha Google Key",
ErrorMessage = "Invalid input captcha.",
RequiredMessage = "The captcha field is required.")]
public ActionResult MyAction(myVM model)
{
if (ModelState.IsValid) //this will take care of captcha
{
}
}
要么
public ActionResult MyAction(myVM model, bool captchaValid)
{
if (captchaValid) //manually check for captchaValid
{
}
}
MVC 5的异步版本(即避免ActionFilterAttribute,在MVC 6之前不是异步)和reCAPTCHA 2
ExampleController.cs
public class HomeController : Controller
{
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> ContactSubmit(
[Bind(Include = "FromName, FromEmail, FromPhone, Message, ContactId")]
ContactViewModel model)
{
if (!await RecaptchaServices.Validate(Request))
{
ModelState.AddModelError(string.Empty, "You have not confirmed that you are not a robot");
}
if (ModelState.IsValid)
{
...
ExampleView.cshtml
@model MyMvcApp.Models.ContactViewModel
@*This is assuming the master layout places the styles section within the head tags*@
@section Styles {
@Styles.Render("~/Content/ContactPage.css")
<script src='https://www.google.com/recaptcha/api.js'></script>
}
@using (Html.BeginForm("ContactSubmit", "Home",FormMethod.Post, new { id = "contact-form" }))
{
@Html.AntiForgeryToken()
...
<div class="form-group">
@Html.LabelFor(m => m.Message)
@Html.TextAreaFor(m => m.Message, new { @class = "form-control", @cols = "40", @rows = "3" })
@Html.ValidationMessageFor(m => m.Message)
</div>
<div class="row">
<div class="g-recaptcha" data-sitekey='@System.Configuration.ConfigurationManager.AppSettings["RecaptchaClientKey"]'></div>
</div>
<div class="row">
<input type="submit" id="submit-button" class="btn btn-default" value="Send Your Message" />
</div>
}
RecaptchaServices.cs
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Web;
using System.Configuration;
using System.Net.Http;
using System.Net.Http.Headers;
using Newtonsoft.Json;
using System.Runtime.Serialization;
namespace MyMvcApp.Services
{
public class RecaptchaServices
{
//ActionFilterAttribute has no async for MVC 5 therefore not using as an actionfilter attribute - needs revisiting in MVC 6
internal static async Task<bool> Validate(HttpRequestBase request)
{
string recaptchaResponse = request.Form["g-recaptcha-response"];
if (string.IsNullOrEmpty(recaptchaResponse))
{
return false;
}
using (var client = new HttpClient { BaseAddress = new Uri("https://www.google.com") })
{
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("secret", ConfigurationManager.AppSettings["RecaptchaSecret"]),
new KeyValuePair<string, string>("response", recaptchaResponse),
new KeyValuePair<string, string>("remoteip", request.UserHostAddress)
});
var result = await client.PostAsync("/recaptcha/api/siteverify", content);
result.EnsureSuccessStatusCode();
string jsonString = await result.Content.ReadAsStringAsync();
var response = JsonConvert.DeserializeObject<RecaptchaResponse>(jsonString);
return response.Success;
}
}
[DataContract]
internal class RecaptchaResponse
{
[DataMember(Name = "success")]
public bool Success { get; set; }
[DataMember(Name = "challenge_ts")]
public DateTime ChallengeTimeStamp { get; set; }
[DataMember(Name = "hostname")]
public string Hostname { get; set; }
[DataMember(Name = "error-codes")]
public IEnumerable<string> ErrorCodes { get; set; }
}
}
}
web.config中
<configuration>
<appSettings>
<!--recaptcha-->
<add key="RecaptchaSecret" value="***secret key from https://developers.google.com/recaptcha***" />
<add key="RecaptchaClientKey" value="***client key from https://developers.google.com/recaptcha***" />
</appSettings>
</configuration>
我已成功通过以下方式实施ReCaptcha.
注意:这是在VB中,但可以很容易地转换
1]首先获取reCaptcha库的副本
2]然后构建一个自定义ReCaptcha HTML Helper
''# fix SO code coloring issue.
<Extension()>
Public Function reCaptcha(ByVal htmlHelper As HtmlHelper) As MvcHtmlString
Dim captchaControl = New Recaptcha.RecaptchaControl With {.ID = "recaptcha",
.Theme = "clean",
.PublicKey = "XXXXXX",
.PrivateKey = "XXXXXX"}
Dim htmlWriter = New HtmlTextWriter(New IO.StringWriter)
captchaControl.RenderControl(htmlWriter)
Return MvcHtmlString.Create(htmlWriter.InnerWriter.ToString)
End Function
3]从这里你需要一个可重复使用的服务器端验证器
Public Class ValidateCaptchaAttribute : Inherits ActionFilterAttribute
Private Const CHALLENGE_FIELD_KEY As String = "recaptcha_challenge_field"
Private Const RESPONSE_FIELD_KEY As String = "recaptcha_response_field"
Public Overrides Sub OnActionExecuting(ByVal filterContext As ActionExecutingContext)
If IsNothing(filterContext.HttpContext.Request.Form(CHALLENGE_FIELD_KEY)) Then
''# this will push the result value into a parameter in our Action
filterContext.ActionParameters("CaptchaIsValid") = True
Return
End If
Dim captchaChallengeValue = filterContext.HttpContext.Request.Form(CHALLENGE_FIELD_KEY)
Dim captchaResponseValue = filterContext.HttpContext.Request.Form(RESPONSE_FIELD_KEY)
Dim captchaValidtor = New RecaptchaValidator() With {.PrivateKey = "xxxxx",
.RemoteIP = filterContext.HttpContext.Request.UserHostAddress,
.Challenge = captchaChallengeValue,
.Response = captchaResponseValue}
Dim recaptchaResponse = captchaValidtor.Validate()
''# this will push the result value into a parameter in our Action
filterContext.ActionParameters("CaptchaIsValid") = recaptchaResponse.IsValid
MyBase.OnActionExecuting(filterContext)
End Sub
现在您已经拥有了可重复使用的代码......您只需将验证码添加到View中即可.
<%: Html.reCaptcha %>
当您将表单发布到控制器时...
''# Fix SO code coloring issues
<ValidateCaptcha()>
<AcceptVerbs(HttpVerbs.Post)>
Function Add(ByVal CaptchaIsValid As Boolean, ByVal [event] As Domain.Event) As ActionResult
If Not CaptchaIsValid Then ModelState.AddModelError("recaptcha", "*")
'#' Validate the ModelState and submit the data.
If ModelState.IsValid Then
''# Post the form
Else
''# Return View([event])
End If
End Function
第1步:客户端站点集成
将此代码段粘贴到</head>HTML模板上的结束标记之前:
<script src='https://www.google.com/recaptcha/api.js'></script>
将此代码段粘贴到<form>您希望reCAPTCHA小部件显示的位置的末尾:
<div class="g-recaptcha" data-sitekey="your-site-key"></div>
第2步:服务器站点集成
当您的用户提交集成reCAPTCHA的表单时,您将获得一个名为"g-recaptcha-response"的字符串作为有效负载的一部分.要检查Google是否已验证该用户,请发送包含以下参数的POST请求:
网址:https://www.google.com/recaptcha/api/siteverify
秘密:你的秘密密钥
回应:'g-recaptcha-response'的价值.
现在你的MVC应用程序的行动:
// return ActionResult if you want
public string RecaptchaWork()
{
// Get recaptcha value
var r = Request.Params["g-recaptcha-response"];
// ... validate null or empty value if you want
// then
// make a request to recaptcha api
using (var wc = new WebClient())
{
var validateString = string.Format(
"https://www.google.com/recaptcha/api/siteverify?secret={0}&response={1}",
"your_secret_key", // secret recaptcha key
r); // recaptcha value
// Get result of recaptcha
var recaptcha_result = wc.DownloadString(validateString);
// Just check if request make by user or bot
if (recaptcha_result.ToLower().Contains("false"))
{
return "recaptcha false";
}
}
// Do your work if request send from human :)
}
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