private CacheDigestHeaderValue GetCacheDigest(HttpRequestBase request)
{
CacheDigestHeaderValue cacheDigest = null;
if (UseCookieBasedCacheDigest)
{
cacheDigest = (request.Cookies[RequestHeaders.CacheDigest] != null) ? new CacheDigestHeaderValue(CacheDigestValue.FromBase64String(request.Cookies[RequestHeaders.CacheDigest].Value), validators: CacheDigestValidators) : null;
}
else
{
cacheDigest = (request.Headers[RequestHeaders.CacheDigest] != null) ? new CacheDigestHeaderValue(request.Headers[RequestHeaders.CacheDigest]) : null;
}
return(cacheDigest);
}
/// <summary>
/// Called before an action method executes.
/// </summary>
/// <param name="filterContext"></param>
public void OnActionExecuting(ActionExecutingContext filterContext)
{
if (filterContext == null)
{
throw new ArgumentNullException(nameof(filterContext));
}
// HTTP/2 is currently supported only over HTTPS
if (filterContext.HttpContext.Request.IsSecureConnection)
{
CacheDigestHeaderValue cacheDigest = GetCacheDigest(filterContext.HttpContext.Request);
IDictionary <string, string> cacheDigestUrls = PushPromises(filterContext, cacheDigest);
SetCacheDigest(filterContext.HttpContext, cacheDigestUrls);
}
}
private IDictionary <string, string> PushPromises(ActionExecutingContext filterContext, CacheDigestHeaderValue cacheDigest)
{
bool newCacheDigestValueNeeded = false;
IDictionary <string, string> cacheDigestUrls = new Dictionary <string, string>();
IEnumerable <PushPromiseTable.Entry> pushPromiseEntries = _pushPromiseTable.GetPushPromiseEntries(filterContext.ActionDescriptor.ControllerDescriptor.ControllerName, filterContext.ActionDescriptor.ActionName);
foreach (PushPromiseTable.Entry pushPromiseEntry in pushPromiseEntries)
{
pushPromiseEntry.AbsoluteUrl = pushPromiseEntry.AbsoluteUrl ?? GetAbsolutePushPromiseContentUrl(filterContext.RequestContext, pushPromiseEntry.ContentPath);
if (!(cacheDigest?.QueryDigest(pushPromiseEntry.AbsoluteUrl, pushPromiseEntry.EntityTag) ?? false))
{
filterContext.HttpContext.Response.PushPromise(pushPromiseEntry.ContentPath);
newCacheDigestValueNeeded = newCacheDigestValueNeeded || pushPromiseEntry.TrackInCacheDigest;
}
if (UseCookieBasedCacheDigest && pushPromiseEntry.TrackInCacheDigest)
{
cacheDigestUrls.Add(pushPromiseEntry.AbsoluteUrl, pushPromiseEntry.EntityTag);
}
}
return(newCacheDigestValueNeeded ? cacheDigestUrls : null);
}
