/// <summary>
/// Creates an instance of the <see cref="RecaptchaHtmlHelper"/> class.
/// </summary>
/// <param name="publicKey">Sets the public key to be part of the recaptcha HTML.</param>
public RecaptchaHtmlHelper(string publicKey)
{
if (String.IsNullOrEmpty(publicKey))
{
throw new InvalidOperationException("Public key cannot be null or empty.");
}
this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
UseSsl = HttpContext.Current.Request.Url.AbsoluteUri.StartsWith("https");
}
/// <summary>
/// Creates an instance of the <see cref="RecaptchaHtmlHelper"/> class.
/// </summary>
/// <param name="publicKey">Sets the public key of the recaptcha HTML.</param>
/// <param name="theme">Sets the theme of the recaptcha HTML.</param>
/// <param name="language">Sets the language of the recaptcha HTML.</param>
/// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>
public RecaptchaHtmlHelper(string publicKey, RecaptchaTheme theme, string language, int tabIndex)
{
this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
if (String.IsNullOrEmpty(this.PublicKey))
{
throw new InvalidOperationException("Public key cannot be null or empty.");
}
this.Theme = theme;
this.Language = language;
this.TabIndex = tabIndex;
UseSsl = HttpContext.Current.Request.Url.AbsoluteUri.StartsWith("https");
}
/// <summary>
/// Verifies whether the user's response to the recaptcha request is correct.
/// </summary>
/// <returns>Returns the result as a value of the <see cref="RecaptchaVerificationResult"/> enum.</returns>
public RecaptchaVerificationResult VerifyRecaptchaResponse()
{
if (string.IsNullOrEmpty(_Challenge))
{
return(RecaptchaVerificationResult.ChallengeNotProvided);
}
if (string.IsNullOrEmpty(Response))
{
return(RecaptchaVerificationResult.NullOrEmptyCaptchaSolution);
}
string privateKey = RecaptchaKeyHelper.ParseKey(PrivateKey);
string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privateKey, this.UserHostAddress, this._Challenge, this.Response);
byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);
Uri verifyUri = null;
if (!UseSsl)
{
verifyUri = new Uri("http://api-verify.recaptcha.net/verify", UriKind.Absolute);
}
else
{
verifyUri = new Uri("https://api-verify.recaptcha.net/verify", UriKind.Absolute);
}
try
{
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(verifyUri);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = postDataBuffer.Length;
webRequest.Method = "POST";
IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = CredentialCache.DefaultCredentials;
webRequest.Proxy = proxy;
Stream requestStream = webRequest.GetRequestStream();
requestStream.Write(postDataBuffer, 0, postDataBuffer.Length);
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
string[] responseTokens = null;
using (StreamReader sr = new StreamReader(webResponse.GetResponseStream()))
{
responseTokens = sr.ReadToEnd().Split('\n');
}
if (responseTokens.Length == 2)
{
Boolean success = responseTokens[0].Equals("true", StringComparison.CurrentCulture);
if (success)
{
return(RecaptchaVerificationResult.Success);
}
else
{
if (responseTokens[1].Equals("incorrect-captcha-sol", StringComparison.CurrentCulture))
{
return(RecaptchaVerificationResult.IncorrectCaptchaSolution);
}
else if (responseTokens[1].Equals("invalid-site-private-key", StringComparison.CurrentCulture))
{
return(RecaptchaVerificationResult.InvalidPrivateKey);
}
else if (responseTokens[1].Equals("invalid-request-cookie", StringComparison.CurrentCulture))
{
return(RecaptchaVerificationResult.InvalidCookieParameters);
}
}
}
return(RecaptchaVerificationResult.UnknownError);
}
catch (Exception ex)
{
throw ex;
}
}
