using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.IO;
using System.Web.Mvc;
namespace WeBlog.Core {
public static class RecaptchaUtils {
public static JsonResult ValidateRecaptcha( string privateKey, string remoteip, string challenge, string response) {
string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}",
privateKey, remoteip,
challenge, response);
JsonResult result = new JsonResult();
byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);
Uri serviceUri = new Uri("http://api-verify.recaptcha.net/verify", UriKind.Absolute);
try {
HttpWebRequest webRequest = (HttpWebRequest)System.Net.WebRequest.Create(serviceUri);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = postDataBuffer.Length;
webRequest.Method = "POST";
//incase you are using a proxy server
IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;
webRequest.Proxy = proxy;
Stream requestStream = webRequest.GetRequestStream();
requestStream.Write(postDataBuffer, 0, postDataBuffer.Length);
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
string jsonResponse = string.Empty;
using (StreamReader sr = new StreamReader(webResponse.GetResponseStream()))
jsonResponse = sr.ReadToEnd();
string[] tokens = jsonResponse.Split(new char[] { '\n' });
if (tokens.Length == 2) {
Boolean success = tokens[0].Equals("true", StringComparison.CurrentCulture);
result.Data = new { Success = success, Message = tokens[1] };
}
else {
result.Data = new { Success = false, Message = "Invalid response returned" };
}
}
catch (Exception ex) {
result.Data = new { Success = false, Message = ex.Message };
}
return result;
}
}
}
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