private DateTime?GetTokenValue(ControllerBase controller, string value)
{
switch (StorageType)
{
case StorageType.TempData:
if (controller.TempData.ContainsKey(value))
{
var result = (DateTime)controller.TempData[value];
controller.TempData.Remove(value);
return(result);
}
return(null);
case StorageType.Session:
var dictionary = CaptchaUtils.GetFromSession(SessionKey, () => new ConcurrentDictionary <KeyTimeEntry <string>, DateTime>());
DateTime time;
if (dictionary.TryRemove(value, out time))
{
return(time);
}
return(null);
default:
throw new ArgumentOutOfRangeException();
}
}
/// <summary>
/// Creates a captcha image for specified <see cref="IDrawingModel" /> and write it in response.
/// </summary>
/// <param name="response">
/// The specified <see cref="HttpResponseBase" />.
/// </param>
/// <param name="drawingModel">
/// The specified <see cref="IDrawingModel" />.
/// </param>
public virtual void WriteCaptchaImage(HttpResponseBase response, IDrawingModel drawingModel)
{
Validate.ArgumentNotNull(response, "response");
Validate.ArgumentNotNull(drawingModel, "drawingModel");
using (Bitmap bitmap = CaptchaUtils.ImageGeneratorFactory(drawingModel).Generate(drawingModel))
{
response.ContentType = "image/gif";
bitmap.Save(response.OutputStream, ImageFormat.Gif);
}
}
private bool RemoveTokenValue(ControllerBase controller, string value)
{
switch (StorageType)
{
case StorageType.TempData:
return(controller.TempData.Remove(value));
case StorageType.Session:
var hashSet = CaptchaUtils.GetFromSession(SessionKey, () => new HashSet <KeyTimeEntry <string> >());
return(hashSet.Remove(value));
default:
throw new ArgumentOutOfRangeException();
}
}
private void SaveTokenValue(ICaptcha captcha)
{
switch (StorageType)
{
case StorageType.TempData:
captcha.BuildInfo.HtmlHelper.ViewContext.TempData[captcha.BuildInfo.TokenValue] = DateTime.UtcNow;
break;
case StorageType.Session:
var dictionary = CaptchaUtils.GetFromSession(SessionKey, () => new ConcurrentDictionary <KeyTimeEntry <string>, DateTime>());
dictionary.ClearIfNeed(SessionValuesMaxCount);
dictionary.TryAdd(captcha.BuildInfo.TokenValue, DateTime.UtcNow);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private void SaveTokenValue(ICaptcha captcha)
{
switch (StorageType)
{
case StorageType.TempData:
captcha.BuildInfo.HtmlHelper.ViewContext.TempData[captcha.BuildInfo.TokenValue] = true;
break;
case StorageType.Session:
var hashSet = CaptchaUtils.GetFromSession(SessionKey, () => new HashSet <KeyTimeEntry <string> >());
hashSet.ClearIfNeed(SessionValuesMaxCount);
hashSet.Add(captcha.BuildInfo.TokenValue);
break;
default:
throw new ArgumentOutOfRangeException();
}
}