Added support for per site options and OpenID Connect

Oqtane.Server/Infrastructure/AliasAccessor.cs

@@ -0,0 +1,18 @@
+using Microsoft.AspNetCore.Http;
+using Oqtane.Extensions;
+using Oqtane.Models;
+
+namespace Oqtane.Infrastructure
+{
+    public class AliasAccessor : IAliasAccessor
+    {
+        private readonly IHttpContextAccessor _httpContextAccessor;
+
+        public AliasAccessor(IHttpContextAccessor httpContextAccessor)
+        {
+            _httpContextAccessor = httpContextAccessor;
+        }
+
+        public Alias Alias => _httpContextAccessor.HttpContext.GetAlias();
+    }
+}