public async Task Invoke(HttpContext context)
{
var requestFeatures = context.Features.Get <IHttpRequestFeature>();
if (!_settings.Enabled || !HttpMethods.IsGet(requestFeatures.Method) || (context.Request.GetTypedHeaders().CacheControl?.NoCache ?? false))
{
await _next.Invoke(context);
return;
}
var cacheKey = requestFeatures.RawTarget;
try
{
CachedResponse cachedResponse = null;
if (context.User.Identity.IsAuthenticated)
{
cachedResponse = _memoryCache.Get <CachedResponse>($"{cacheKey}_u:{context.User.FindFirst(ClaimTypes.NameIdentifier).Value}");
if (cachedResponse == null)
{
cachedResponse = _memoryCache.Get <CachedResponse>(cacheKey);
if (cachedResponse?.ForAnonymusUsers ?? false)
{
cachedResponse = null;
}
}
}
else
{
cachedResponse = _memoryCache.Get <CachedResponse>(cacheKey);
}
if (cachedResponse != null)
{
await cachedResponse.Apply(context).ConfigureAwait(false);
return;
}
}
catch (Exception ex) {
_logger.Exception(ex);
}
var cachedItem = await CaptureResponse(context).ConfigureAwait(false);
if (cachedItem != null)
{
try
{
if (context.Items.TryGetValue(Consts.IsCachebleKey, out object isCacheble) && (isCacheble is bool) && (bool)isCacheble)
{
cacheKey = requestFeatures.RawTarget;
if (context.Items.TryGetValue(Consts.IsUserSpecificKey, out object isUserSpecific) &&
(isUserSpecific is bool) && (bool)isUserSpecific)
{
if (context.User.Identity.IsAuthenticated)
{
cacheKey = $"{cacheKey}_u:{context.User.FindFirst(ClaimTypes.NameIdentifier).Value}";
}
else
{
cachedItem.ForAnonymusUsers = true;
}
}
var slidingDuration = (context.Items.TryGetValue(Consts.SlidingDurationKey, out object slidingDurationO) && (slidingDurationO is int)) ?
TimeSpan.FromSeconds((int)slidingDurationO) : TimeSpan.Zero;
var duration = (context.Items.TryGetValue(Consts.DurationKey, out object durationO) && (durationO is int)) ?
TimeSpan.FromSeconds((int)durationO) :
TimeSpan.FromSeconds(_settings.MaxCacheInSec);
var options = new MemoryCacheEntryOptions();
if (slidingDuration > TimeSpan.Zero)
{
options.SlidingExpiration = slidingDuration;
}
else
{
options.AbsoluteExpirationRelativeToNow = duration;
}
Dictionary <string, string> tagsToApply = null;
if (context.Items.TryGetValue(Consts.CachedObjectTags, out var tagsO) && tagsO is Dictionary <string, string> tags)
{
tagsToApply = tags;
}
_memoryCache.Add(cacheKey, cachedItem, options, tagsToApply);
}
}
catch (Exception ex)
{
_logger.Exception(ex);
}
}
}
