Hi,
I have implemented this with reCAPTCHA4net from
http://recaptcha4net.codeplex.com/
Demo at shop.getyournet.ch
Step 1
In Nop.Web.Framework, add a reference to the assembly Recaptcha.Web
Also add a reference to System.Net.Http
Step 2
In Nop.Web.Framework > UI > Captcha, change the file HtmlExtensions.cs
Code: Select all
using System.IO;
using System.Web.Mvc;
using System.Web.UI;
using Nop.Core.Infrastructure;
namespace Nop.Web.Framework.UI.Captcha
{
public static class HtmlExtensions
{
public static string GenerateCaptcha(this HtmlHelper helper)
{
var captchaSettings = EngineContext.Current.Resolve<CaptchaSettings>();
var theme = !string.IsNullOrEmpty(captchaSettings.ReCaptchaTheme) ? captchaSettings.ReCaptchaTheme : "white";
var captchaControl = new Recaptcha.Web.UI.Controls.Recaptcha
{
ID = "recaptcha",
ColorTheme = Recaptcha.Web.ColorTheme.Light,
PublicKey = captchaSettings.ReCaptchaPublicKey,
PrivateKey = captchaSettings.ReCaptchaPrivateKey
};
var htmlWriter = new HtmlTextWriter(new StringWriter());
captchaControl.RenderControl(htmlWriter);
return htmlWriter.InnerWriter.ToString();
}
}
}
Step 3
In Nop.Web.Framework > UI > Captcha, change the file CaptchaValidatorAttribute.cs
Code: Select all
using System.Web.Mvc;
using Nop.Core.Infrastructure;
using System;
using System.Net.Http;
using Newtonsoft.Json.Linq;
using Nop.Services.Tasks;
using System.Threading.Tasks;
namespace Nop.Web.Framework.UI.Captcha
{
public class CaptchaValidatorAttribute : ActionFilterAttribute
{
private const string RESPONSE_FIELD_KEY = "g-reCAPTCHA-response";
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
var valid = false;
var captchaResponseValue = filterContext.HttpContext.Request.Form[RESPONSE_FIELD_KEY];
if (!string.IsNullOrEmpty(captchaResponseValue))
{
var captchaSettings = EngineContext.Current.Resolve<CaptchaSettings>();
if (captchaSettings.Enabled)
valid = System.Threading.Tasks.Task.Factory.StartNew(async () => await ValidateResponse(captchaResponseValue, captchaSettings.ReCaptchaPrivateKey).ConfigureAwait(false)).Unwrap().Result;
}
//this will push the result value into a parameter in our Action
filterContext.ActionParameters["captchaValid"] = valid;
base.OnActionExecuting(filterContext);
}
private async Task<bool> ValidateResponse(string captchaResponseValue, string key)
{
var valid = false;
var uribuilder = new UriBuilder("https://www.google.com/recaptcha/api/siteverify")
{
Query = string.Format("secret={0}&response={1}", key, captchaResponseValue)
};
using (var httpClient = new HttpClient())
{
var async = await httpClient.GetAsync(uribuilder.Uri);
async.EnsureSuccessStatusCode();
var readstring = await async.Content.ReadAsStringAsync();
var resultobject = JObject.Parse(readstring);
valid = resultobject.Value<bool>("success");
}
return valid;
}
}
}
Step 4
Compile the project and copy Nop.Web.Framework.dll and Recaptcha.Web.dll to the bin folder of your production site.
). So with version 2 sometimes only a simple checkbox must be clicked instead of looking at a picture and try to read the right value out of it.