/// <summary>
/// Called when [action executed].
/// </summary>
/// <param name="filterContext">The filter filterContext.</param>
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
bool isValid = false;
// get the guid from the post back
string guid = filterContext.HttpContext.Request.Form["_MvcCaptchaGuid"];
var captchaSettings = EngineContext.Current.Resolve <CaptchaSettings>();
if (captchaSettings.Enabled)
{
// get values
var image = MvcCaptchaImage.GetCachedCaptcha(guid);
string actualValue = filterContext.HttpContext.Request.Form[Field];
string expectedValue = image == null ? String.Empty : image.Text;
// removes the captch from Session so it cannot be used again
filterContext.HttpContext.Session.Remove(guid);
isValid = !String.IsNullOrEmpty(actualValue) &&
!String.IsNullOrEmpty(expectedValue) &&
String.Equals(actualValue, expectedValue, StringComparison.OrdinalIgnoreCase);
if (!isValid)
{
((Controller)filterContext.Controller).ModelState.AddModelError(Field, "验证码不匹配");
}
}
filterContext.ActionParameters["captchaValid"] = isValid;
base.OnActionExecuting(filterContext);//(string)filterContext.HttpContext.GetGlobalResourceObject("LangPack","ValidationCode_Not_Match"));
}
public override void ExecuteResult(ControllerContext context)
{
string guid = context.HttpContext.Request.ServerVariables["Query_String"];
if (guid.Contains("&"))
{
guid = guid.Split('&')[0];
}
var ci = MvcCaptchaImage.GetCachedCaptcha(guid);
if (String.IsNullOrEmpty(guid) || ci == null)
{
context.HttpContext.Response.StatusCode = 404;
context.HttpContext.Response.StatusDescription = "Not Found";
context.HttpContext.Response.End();
return;
}
ci.ResetText();
using (var b = ci.RenderImage())
{
b.Save(context.HttpContext.Response.OutputStream, ImageFormat.Gif);
}
context.HttpContext.Response.Cache.SetNoStore();
context.HttpContext.Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
context.HttpContext.Response.ContentType = "image/gif";
context.HttpContext.Response.StatusCode = 200;
context.HttpContext.Response.StatusDescription = "OK";
context.HttpContext.ApplicationInstance.CompleteRequest();
}