// Generate a new valid option
// @param numberOfOptions is optional. Defaults to 5
public void Generate(int numberOfOptions = DefaultNumberOfImages)
{
var visualCaptchaSession = new VisualCaptchaSession();
// Shuffle all imageOptions
ImageOptions = ImageOptions.Shuffle().ToList();
if (numberOfOptions < 2)
{
numberOfOptions = 2;
}
// Get a random sample of X images
// AND Set a random value for each of the images, to be used in the frontend
visualCaptchaSession.Images = ImageOptions.Shuffle()
.Take(numberOfOptions)
.Select(x => new Option {
name = x.name, path = x.path, value = Extensions.GenerateRandomKey(20)
})
.ToList();
// Select a random image option, for the current valid image option (but not the last one)
visualCaptchaSession.ValidImageOption =
visualCaptchaSession.Images.Except(new[] { visualCaptchaSession.ValidImageOption }).Shuffle().First();
// Select a random audio option, for the current valid audio option (but not the last one)
visualCaptchaSession.ValidAudioOption =
AudioOptions.Except(new[] { visualCaptchaSession.ValidAudioOption }).Shuffle().First();
// Set random hashes for audio and image field names, and add it in the frontend data object
visualCaptchaSession.FrontendData = new FrontendData()
{
values = visualCaptchaSession.Images.Select(x => x.value).ToList(),
imageName = visualCaptchaSession.ValidImageOption.name,
imageFieldName = Extensions.GenerateRandomKey(20),
audioFieldName = Extensions.GenerateRandomKey(20),
};
Session = visualCaptchaSession;
}
// Generate a new valid option
// @param numberOfOptions is optional. Defaults to 5
public void Generate(int numberOfOptions = DefaultNumberOfImages)
{
var visualCaptchaSession = new VisualCaptchaSession();
// Shuffle all imageOptions
ImageOptions = ImageOptions.Shuffle().ToList();
if (numberOfOptions < 2)
{
numberOfOptions = 2;
}
// Get a random sample of X images
// AND Set a random value for each of the images, to be used in the frontend
visualCaptchaSession.Images = ImageOptions.Shuffle()
.Take(numberOfOptions)
.Select(x => new Option {name = x.name, path = x.path, value = Extensions.GenerateRandomKey(20)})
.ToList();
// Select a random image option, for the current valid image option (but not the last one)
visualCaptchaSession.ValidImageOption =
visualCaptchaSession.Images.Except(new[] {visualCaptchaSession.ValidImageOption}).Shuffle().First();
// Select a random audio option, for the current valid audio option (but not the last one)
visualCaptchaSession.ValidAudioOption =
AudioOptions.Except(new[] {visualCaptchaSession.ValidAudioOption}).Shuffle().First();
// Set random hashes for audio and image field names, and add it in the frontend data object
visualCaptchaSession.FrontendData = new FrontendData()
{
values = visualCaptchaSession.Images.Select(x => x.value).ToList(),
imageName = visualCaptchaSession.ValidImageOption.name,
imageFieldName = Extensions.GenerateRandomKey(20),
audioFieldName = Extensions.GenerateRandomKey(20),
};
Session = visualCaptchaSession;
}
public void SetSession(string key, VisualCaptchaSession value)
{
HttpContext.Current.Session[key] = value;
}
