Support for injecting WebTokenRequest.Properties (#207)

* Add V2 model for Uwp authorization

* Make v2 model only for MSA

* Replace with new properties

* Update comment

* Remove null check

CommunityToolkit.Authentication.Uwp/WebAccountProviderConfig.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Collections.Generic;
+
 namespace CommunityToolkit.Authentication
 {
     /// <summary>
@@ -19,6 +21,16 @@ namespace CommunityToolkit.Authentication
         /// </summary>
         public WebAccountProviderType WebAccountProviderType { get; set; }
 
+        /// <summary>
+        /// Gets or sets the properties that need to be added when constructing <see cref="Windows.Security.Authentication.Web.Core.WebTokenRequest"/> (for MSA).
+        /// </summary>
+        public IDictionary<string, string> MSATokenRequestProperties { get; set; }
+
+        /// <summary>
+        /// Gets or sets the properties that need to be added when constructing <see cref="Windows.Security.Authentication.Web.Core.WebTokenRequest"/> (for AAD).
+        /// </summary>
+        public IDictionary<string, string> AADTokenRequestProperties { get; set; }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="WebAccountProviderConfig"/> struct.
         /// </summary>
@@ -28,6 +40,8 @@ namespace CommunityToolkit.Authentication
         {
             WebAccountProviderType = webAccountProviderType;
             ClientId = clientId;
+            MSATokenRequestProperties = new Dictionary<string, string>();
+            AADTokenRequestProperties = new Dictionary<string, string>();
         }
     }
 }

CommunityToolkit.Authentication.Uwp/WindowsProvider.cs

@@ -33,7 +33,7 @@ namespace CommunityToolkit.Authentication
         private const string SettingsKeyProviderId = "WindowsProvider_ProviderId";
         private const string SettingsKeyProviderAuthority = "WindowsProvider_Authority";
 
-        private static readonly SemaphoreSlim SemaphoreSlim = new (1);
+        private static readonly SemaphoreSlim SemaphoreSlim = new(1);
 
         // Default/minimal scopes for authentication, if none are provided.
         private static readonly string[] DefaultScopes = { "User.Read" };
@@ -550,6 +550,20 @@ namespace CommunityToolkit.Authentication
                 : new WebTokenRequest(provider, scopesString, clientId);
 
             webTokenRequest.Properties.Add(GraphResourcePropertyKey, GraphResourcePropertyValue);
+            if (provider.Authority == MicrosoftAccountAuthority)
+            {
+                foreach (var property in _webAccountProviderConfig.MSATokenRequestProperties)
+                {
+                    webTokenRequest.Properties.Add(property);
+                }
+            }
+            else if (provider.Authority == AadAuthority)
+            {
+                foreach (var property in _webAccountProviderConfig.AADTokenRequestProperties)
+                {
+                    webTokenRequest.Properties.Add(property);
+                }
+            }
 
             return webTokenRequest;
         }