// Determine the challenge and the required response
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
EnsureChildControls();
CheckResponseAndStoreState(); // Do this (if it hasn't already been done) before preparing the next challenge
// Default challenge is to perform a trivial complement of a number
var eventArgs = new NoBotEventArgs();
var utcNow = DateTime.UtcNow;
var randomValue = utcNow.Millisecond;
eventArgs.ChallengeScript = String.Format(CultureInfo.InvariantCulture, "~{0}", randomValue.ToString(CultureInfo.InvariantCulture));
eventArgs.RequiredResponse = (~randomValue).ToString(CultureInfo.InvariantCulture);
// If a custom challenge has been provided, use it instead
if (GenerateChallengeAndResponse != null)
{
GenerateChallengeAndResponse(this, eventArgs);
}
// Send down the challenge
_extender.ChallengeScript = eventArgs.ChallengeScript;
_extender.ClientState = String.Empty;
// Save values for use during postback
ViewState[ResponseTimeKey] = utcNow.AddSeconds(_responseMinimumDelaySeconds);
var sessionKey = CreateSessionKey(utcNow.Ticks);
ViewState[SessionKeyKey] = sessionKey;
Page.Session[sessionKey] = eventArgs.RequiredResponse;
}
// Determine the challenge and the required response
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
EnsureChildControls();
CheckResponseAndStoreState(); // Do this (if it hasn't already been done) before preparing the next challenge
// Default challenge is to perform a trivial complement of a number
NoBotEventArgs eventArgs = new NoBotEventArgs();
DateTime utcNow = DateTime.UtcNow;
int randomValue = utcNow.Millisecond;
eventArgs.ChallengeScript = string.Format(CultureInfo.InvariantCulture, "~{0}", randomValue.ToString(CultureInfo.InvariantCulture));
eventArgs.RequiredResponse = (~randomValue).ToString(CultureInfo.InvariantCulture);
// If a custom challenge has been provided, use it instead
if (null != GenerateChallengeAndResponse)
{
GenerateChallengeAndResponse(this, eventArgs);
}
// Send down the challenge
_extender.ChallengeScript = eventArgs.ChallengeScript;
_extender.ClientState = "";
// Save values for use during postback
ViewState[ResponseTimeKey] = utcNow.AddSeconds(_responseMinimumDelaySeconds);
string sessionKey = CreateSessionKey(utcNow.Ticks);
ViewState[SessionKeyKey] = sessionKey;
Page.Session[sessionKey] = eventArgs.RequiredResponse;
}
protected void NoBot1_GenerateChallengeAndResponse(object sender,
AjaxControlToolkit.NoBotEventArgs e)
{
NoBotState state;
NoBot1.IsValid(out state);
Label1.Text = state.ToString();
}
protected void CustomChallengeResponse(object sender, NoBotEventArgs e)
{
// This is a sample challenge/response implementation that involves
// the DOM so as to make the calculation more difficult to thwart.
// It adds a randomly sized Panel; the client must calculate the area.
Panel p = new Panel();
p.ID = "NoBotSamplePanel";
Random rand = new Random();
p.Width = rand.Next(300);
p.Height = rand.Next(200);
p.Style.Add(HtmlTextWriterStyle.Visibility, "hidden");
p.Style.Add(HtmlTextWriterStyle.Position, "absolute");
((NoBot) sender).Controls.Add(p);
e.ChallengeScript = string.Format("var e = document.getElementById('{0}'); e.offsetWidth * e.offsetHeight;", p.ClientID);
e.RequiredResponse = (p.Width.Value * p.Height.Value).ToString();
}
protected void NoBot2_GenerateChallengeAndResponse(object sender, NoBotEventArgs e)
{
// A simple challenge
e.ChallengeScript = "'cHaLlEnGe'.toUpperCase()";
e.RequiredResponse = "CHALLENGE";
}