improve caching for sites with many registered users

Oqtane.Server/Extensions/ClaimsPrincipalExtensions.cs

@@ -1,5 +1,6 @@
 using System.Linq;
 using System.Security.Claims;
+using Oqtane.Shared;
 
 namespace Oqtane.Extensions
 {
@@ -70,5 +71,17 @@ namespace Oqtane.Extensions
             }
             return -1;
         }
+
+        public static bool IsOnlyInRole(this ClaimsPrincipal claimsPrincipal, string role)
+        {
+            var identity = claimsPrincipal.Identities.FirstOrDefault(item => item.AuthenticationType == Constants.AuthenticationScheme);
+            if (identity != null)
+            {
+                // check if user has role claim specified and no other role claims
+                return identity.Claims.Any(item => item.Type == ClaimTypes.Role && item.Value == role) &&
+                    !identity.Claims.Any(item => item.Type == ClaimTypes.Role && item.Value != role);
+            }
+            return false;
+        }
     }
 }

Oqtane.Server/Services/SiteService.cs

@@ -64,13 +64,25 @@ namespace Oqtane.Services
         {
             if (!_accessor.HttpContext.User.Identity.IsAuthenticated)
             {
+                // unauthenticated
                 return await _cache.GetOrCreateAsync($"site:{_accessor.HttpContext.GetAlias().SiteKey}", async entry =>
                 {
                     entry.SlidingExpiration = TimeSpan.FromMinutes(30);
                     return await GetSite(siteId);
                 }, true);
             }
-            else // authenticated - cached per user
+            else // authenticated
+            {
+                // is only in registered users role - cache by role
+                if (_accessor.HttpContext.User.IsOnlyInRole(RoleNames.Registered))
+                {
+                    return await _cache.GetOrCreateAsync($"site:{_accessor.HttpContext.GetAlias().SiteKey}:{RoleNames.Registered}", async entry =>
+                    {
+                        entry.SlidingExpiration = TimeSpan.FromMinutes(30);
+                        return await GetSite(siteId);
+                    }, true);
+                }
+                else // cache by user
                 {
                     return await _cache.GetOrCreateAsync($"site:{_accessor.HttpContext.GetAlias().SiteKey}:{_accessor.HttpContext.User.UserId}", async entry =>
                     {
@@ -79,6 +91,7 @@ namespace Oqtane.Services
                     }, true);
                 }
             }
+        }
 
         private async Task<Site> GetSite(int siteid)
         {