/// <summary>
/// Generates the captcha image.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="height">The height.</param>
/// <param name="width">The width.</param>
/// <returns>
/// Returns the <see cref="Uri"/> for the generated <see cref="CaptchaImage"/>.
/// </returns>
public static MvcHtmlString CaptchaImage(this HtmlHelper htmlHelper, string imgUrl, int height, int width)
{
Helpers.CaptchaImage image = new Helpers.CaptchaImage
{
Height = height,
Width = width,
};
HttpRuntime.Cache.Add(
image.UniqueId,
image,
null,
DateTime.Now.AddSeconds(Helpers.CaptchaImage.CacheTimeOut),
Cache.NoSlidingExpiration,
CacheItemPriority.NotRemovable,
null);
StringBuilder stringBuilder = new StringBuilder(256);
stringBuilder.Append("<input type=\"hidden\" name=\"captcha-guid\" value=\"");
stringBuilder.Append(image.UniqueId);
stringBuilder.Append("\" />");
stringBuilder.AppendLine();
stringBuilder.Append("<img src=\"");
//!!!
stringBuilder.Append(imgUrl + "?id=" + image.UniqueId);
stringBuilder.Append("\" alt=\"CAPTCHA\" width=\"");
stringBuilder.Append(width);
stringBuilder.Append("\" height=\"");
stringBuilder.Append(height);
stringBuilder.Append("\" />");
return(new MvcHtmlString(stringBuilder.ToString()));
}
public static CaptchaImage GetNewCaptcha(string guid)
{
if (string.IsNullOrEmpty(guid))
{
return(null);
}
Helpers.CaptchaImage image = GetCachedCaptcha(guid);
image = new Helpers.CaptchaImage
{
UniqueId = image.UniqueId,
Height = image.Height,
Width = image.Width,
};
image.UniqueId = guid;
HttpRuntime.Cache.Remove(guid);
HttpRuntime.Cache.Add(
image.UniqueId,
image,
null,
DateTime.Now.AddSeconds(Helpers.CaptchaImage.CacheTimeOut),
System.Web.Caching.Cache.NoSlidingExpiration,
System.Web.Caching.CacheItemPriority.NotRemovable,
null);
return((CaptchaImage)HttpRuntime.Cache.Get(guid));
}
