ReCaptcha
From Logic Wiki
ReCaptchaCheck.cs
using System.Collections.Generic;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
namespace VDSCore.Client.TheVDS.Shared
{
public class ReCaptchaCheck
{
public static string Validate(string EncodedResponse, string PrivateKey)
{
var client = new System.Net.WebClient();
var GoogleReply = client.DownloadString(string.Format("https://www.google.com/recaptcha/api/siteverify?secret={0}&response={1}", PrivateKey, EncodedResponse));
var captchaResponse = Newtonsoft.Json.JsonConvert.DeserializeObject<ReCaptchaCheck>(GoogleReply);
return captchaResponse.Success.ToLower();
}
[JsonProperty("success")]
public string Success
{
get { return m_Success; }
set { m_Success = value; }
}
private string m_Success;
[JsonProperty("error-codes")]
public List<string> ErrorCodes
{
get { return m_ErrorCodes; }
set { m_ErrorCodes = value; }
}
private List<string> m_ErrorCodes;
}
}
cshtml
<head>
<script src='https://www.google.com/recaptcha/api.js'></script>
</head>
<div class="form-group col-sm-6">
<div class="g-recaptcha" data-sitekey="6Lc37XcUAAAAACpU5FLp37ZOAsbLYRNtZl75Br89" data-callback="enableBtn"></div>
<span class="field-validation-valid" data-valmsg-for="Captcha" data-valmsg-replace="true"></span>
</div>
<div class="form-group col-sm-6" style="text-align: right">
<button type="submit" class="btn btn-primary" id="SendButton">Send Message<span></span></button>
</div>
<script>
document.getElementById("SendButton").disabled = true;
function enableBtn(){
document.getElementById("SendButton").disabled = false;
}
</script>
Form Post
string EncodedResponse = Request.Form["g-Recaptcha-Response"];
string PrivateKey = _configuration.GetSection("AppSettings")["CaptchaSecret"];
bool IsCaptchaValid = (ReCaptchaCheck.Validate(EncodedResponse, PrivateKey) == "true" ? true : false);
if (!IsCaptchaValid)
