Fix #4936: add the cookie consent theme control.

Oqtane.Server/Services/CookieConsentService.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Diagnostics.Contracts;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Features;
+using Microsoft.AspNetCore.Localization;
+using Oqtane.Documentation;
+
+namespace Oqtane.Services
+{
+    [PrivateApi("Don't show in the documentation, as everything should use the Interface")]
+    public class ServerCookieConsentService : ICookieConsentService
+    {
+        private readonly IHttpContextAccessor _accessor;
+
+        public ServerCookieConsentService(IHttpContextAccessor accessor)
+        {
+            _accessor = accessor;
+        }
+
+        public Task<bool> CanTrackAsync()
+        {
+            var consentFeature = _accessor.HttpContext?.Features.Get<ITrackingConsentFeature>();
+            var canTrack = consentFeature?.CanTrack ?? true;
+
+            return Task.FromResult(canTrack);
+        }
+
+        public Task<string> CreateConsentCookieAsync()
+        {
+            var consentFeature = _accessor.HttpContext?.Features.Get<ITrackingConsentFeature>();
+            consentFeature?.GrantConsent();
+            var cookie = consentFeature?.CreateConsentCookie() ?? string.Empty;
+
+            return Task.FromResult(cookie);
+        }
+    }
+}