private void CreatedVirtualPath(object sender, UrlBuilderEventArgs urlBuilderEventArgs)
{
if (HttpContext.Current.Request.IsAuthenticated)
{
return;
}
var enabled = CdnConfigurationSection.GetConfiguration().Enabled;
if (!enabled)
{
return;
}
object contentReferenceObject;
if (!urlBuilderEventArgs.RouteValues.TryGetValue(RoutingConstants.NodeKey, out contentReferenceObject))
{
return;
}
var routedContentLink = contentReferenceObject as ContentReference;
if (ContentReference.IsNullOrEmpty(routedContentLink))
{
return;
}
// Check that the link is to a image
var imageData = DataFactory.Instance.Get <IContent>(routedContentLink) as ImageData;
if (imageData == null)
{
return;
}
// Check that everyone has read access to the image
var securable = imageData as ISecurable;
if ((securable.GetSecurityDescriptor().GetAccessLevel(PrincipalInfo.AnonymousPrincipal) & AccessLevel.Read) != AccessLevel.Read)
{
return;
}
// Generate timestamp
var hash = imageData.Saved.Ticks.ToString("X").Substring(2, 8).ToLower();
// Generate new url
var baseUrl = CdnConfigurationSection.GetConfiguration().Url;
if (string.IsNullOrWhiteSpace(baseUrl))
{
baseUrl = SiteDefinition.Current.SiteUrl.AbsoluteUri;
}
var cdnPath = "cdn-" + hash;
var originalPath = urlBuilderEventArgs.UrlBuilder.Path;
var cdnUri = new Uri(baseUrl).Append(cdnPath, originalPath);
urlBuilderEventArgs.UrlBuilder.Uri = cdnUri;
}
private void OnBeginRequest(object sender, EventArgs e)
{
var regex = new Regex("^/cdn-[a-z0-9]{8}/.+", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
var url = HttpContext.Current.Request.Path;
if (!regex.IsMatch(url))
{
return;
}
HttpContext.Current.Items[CdnConfigurationSection.GetConfiguration().ItemKey] = true;
HttpContext.Current.RewritePath(url.Substring(13), String.Empty, String.Empty, true);
}
protected override void SetCachePolicy(HttpContextBase context, DateTime fileChangedDate)
{
var isCdnRequest = HttpContext.Current.Items[CdnConfigurationSection.GetConfiguration().ItemKey];
if (isCdnRequest == null || !(bool)isCdnRequest)
{
base.SetCachePolicy(context, fileChangedDate);
return;
}
fileChangedDate = fileChangedDate > DateTime.UtcNow ? DateTime.UtcNow : fileChangedDate;
context.Response.Cache.SetLastModified(fileChangedDate);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.UtcNow.AddYears(1));
context.Response.Cache.SetValidUntilExpires(true);
context.Response.Cache.VaryByParams.IgnoreParams = true;
context.Response.Cache.SetOmitVaryStar(true);
context.Response.Cache.SetNoServerCaching();
}