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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
namespace Juristr.Mvc
{
/// <summary>
/// Custom OutputCache to overcome a bug in IE8:
/// - http://support.microsoft.com/kb/316431
/// - http://blogs.msdn.com/b/ieinternals/archive/2009/10/02/internet-explorer-cannot-download-over-https-when-no-cache.aspx
/// - http://stackoverflow.com/questions/13119340/ie6-8-unable-to-download-file-from-https-site
/// </summary>
public class EnhancedOutputCacheAttribute : OutputCacheAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
if (!IsFileResultAndOldIE(filterContext))
base.OnActionExecuted(filterContext);
else
{
//try the best to avoid any kind of caching
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.Private);
filterContext.HttpContext.Response.Cache.SetMaxAge(new TimeSpan(0));
filterContext.HttpContext.Response.Cache.SetExpires(DateTime.Now.AddMinutes(-5D));
}
}
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (!IsFileResultAndOldIE(filterContext))
base.OnActionExecuting(filterContext);
}
public override void OnResultExecuted(ResultExecutedContext filterContext)
{
if (!IsFileResultAndOldIE(filterContext))
base.OnResultExecuted(filterContext);
}
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
if (!IsFileResultAndOldIE(filterContext))
base.OnResultExecuting(filterContext);
}
/// <summary>
///
/// </summary>
/// <param name="filterContext"></param>
/// <returns><c>true</c> for FileResults and if the browser is < IE9</returns>
private bool IsFileResultAndOldIE(dynamic filterContext)
{
return filterContext.Result is FileResult &&
filterContext.HttpContext.Request.IsSecureConnection &&
string.Equals(filterContext.HttpContext.Request.Browser.Browser, "IE", StringComparison.OrdinalIgnoreCase) &&
filterContext.HttpContext.Request.Browser.MajorVersion < 9;
}
}
}
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