转移.net core 3.1，为.NET 5做准备

OpenAuth.Identity/Quickstart/Diagnostics/DiagnosticsViewModel.cs

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+// Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
+
+
+using System.Collections.Generic;
+using System.Text;
+using IdentityModel;
+using Microsoft.AspNetCore.Authentication;
+using Newtonsoft.Json;
+
+namespace OpenAuth.IdentityServer.Quickstart.Diagnostics
+{
+    public class DiagnosticsViewModel
+    {
+        public DiagnosticsViewModel(AuthenticateResult result)
+        {
+            AuthenticateResult = result;
+
+            if (result.Properties.Items.ContainsKey("client_list"))
+            {
+                var encoded = result.Properties.Items["client_list"];
+                var bytes = Base64Url.Decode(encoded);
+                var value = Encoding.UTF8.GetString(bytes);
+
+                Clients = JsonConvert.DeserializeObject<string[]>(value);
+            }
+        }
+
+        public AuthenticateResult AuthenticateResult { get; }
+        public IEnumerable<string> Clients { get; } = new List<string>();
+    }
+}