/// <summary>
/// Renders the Captcha Image.
/// </summary>
/// <param name="context">An <see cref="T:System.Web.HttpContext"></see> object that provides
/// references to the intrinsic server objects (for example, Request, Response, Session, and Server)
/// used to service HTTP requests.</param>
public void ProcessRequest(HttpContext context)
{
HttpApplication application = context.ApplicationInstance;
string encryptedCaptchaInfo = application.Request.QueryString["spec"];
CaptchaInfo captcha = CaptchaInfo.FromEncryptedString(encryptedCaptchaInfo);
string textToRender = captcha.Text;
if (string.IsNullOrEmpty(textToRender))
{
application.Response.StatusCode = 404;
application.Response.End();
}
else
{
using (var captchaImage = new CaptchaImage())
{
captchaImage.Width = captcha.Width;
captchaImage.Height = captcha.Height;
captchaImage.FontWarp = captcha.WarpFactor;
captchaImage.Font = captcha.FontFamily;
captchaImage.Text = textToRender;
captchaImage.Image.Save(application.Context.Response.OutputStream, ImageFormat.Jpeg);
}
application.Response.ContentType = "image/jpeg";
application.Response.StatusCode = 200;
application.Response.End();
}
}
public void CanRoundTripCaptchaInfo()
{
DateTime date = DateTime.ParseExact(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss", CultureInfo.InvariantCulture), "yyyy/MM/dd HH:mm:ss", CultureInfo.InvariantCulture);
CaptchaInfo info = new CaptchaInfo("My Test");
info.WarpFactor = CaptchaImage.FontWarpFactor.High;
info.DateGenerated = date;
string encrypted = info.ToEncryptedString();
Assert.IsTrue(encrypted.IndexOf("My Test") < 0);
info = CaptchaInfo.FromEncryptedString(encrypted);
Assert.AreEqual("My Test", info.Text);
Assert.AreEqual(CaptchaImage.FontWarpFactor.High, info.WarpFactor);
Assert.AreEqual(date, info.DateGenerated);
}
/// <summary>
/// Reconstructs an instance of this type from an encrypted serialized string.
/// </summary>
/// <param name="encrypted"></param>
public static CaptchaInfo FromEncryptedString(string encrypted)
{
string decrypted = CaptchaBase.DecryptString(encrypted);
string[] values = decrypted.Split('|');
var info = new CaptchaInfo
{
Width = int.Parse(values[0], CultureInfo.InvariantCulture),
Height = int.Parse(values[1], CultureInfo.InvariantCulture),
WarpFactor = (CaptchaImage.FontWarpFactor)Enum.Parse(typeof(CaptchaImage.FontWarpFactor), values[2]),
FontFamily = values[3],
Text = values[4],
DateGenerated = DateTime.ParseExact(values[5], "yyyy/MM/dd HH:mm:ss", CultureInfo.InvariantCulture)
};
return(info);
}
/// <summary>
/// Reconstructs an instance of this type from an encrypted serialized string.
/// </summary>
/// <param name="encrypted"></param>
public static CaptchaInfo FromEncryptedString(string encrypted)
{
string decrypted = CaptchaBase.DecryptString(encrypted);
string[] values = decrypted.Split('|');
var info = new CaptchaInfo
{
Width = int.Parse(values[0], CultureInfo.InvariantCulture),
Height = int.Parse(values[1], CultureInfo.InvariantCulture),
WarpFactor = (CaptchaImage.FontWarpFactor)Enum.Parse(typeof(CaptchaImage.FontWarpFactor), values[2]),
FontFamily = values[3],
Text = values[4],
DateGenerated = DateTime.ParseExact(values[5], "yyyy/MM/dd HH:mm:ss", CultureInfo.InvariantCulture)
};
return info;
}