added TokenEndpoint to BaseConfiguration (AzureAD#1998)

Author: dannybtsai

src/Microsoft.IdentityModel.Protocols.OpenIdConnect/Configuration/OpenIdConnectConfiguration.cs

@@ -315,7 +315,7 @@ public OpenIdConnectConfiguration(string json)
         /// Gets or sets the 'token_endpoint'.
         /// </summary>
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore, NullValueHandling = NullValueHandling.Ignore, PropertyName = OpenIdProviderMetadataNames.TokenEndpoint, Required = Required.Default)]
-        public string TokenEndpoint { get; set; }
+        public override string TokenEndpoint { get; set; }
 
         /// <summary>
         /// Gets the collection of 'token_endpoint_auth_methods_supported'.

src/Microsoft.IdentityModel.Protocols.WsFederation/Configuration/WsFederationConfiguration.cs

@@ -44,14 +44,5 @@ public ICollection<KeyInfo> KeyInfos
         {
             get;
         } = new List<KeyInfo>();
-
-        /// <summary>
-        /// Gets or sets token endpoint.
-        /// </summary>
-        public string TokenEndpoint
-        {
-            get;
-            set;
-        }
     }
 }

src/Microsoft.IdentityModel.Tokens/BaseConfiguration.cs

@@ -23,5 +23,12 @@ public virtual ICollection<SecurityKey> SigningKeys
         {
             get;
         } = new Collection<SecurityKey>();
+
+        /// <summary>
+        /// Gets or sets the token endpoint specified via the metadata endpoint.
+        /// This can be the fed:SecurityTokenServiceType in WS-Federation, http://docs.oasis-open.org/wsfed/federation/v1.2/os/ws-federation-1.2-spec-os.html#:~:text=fed%3ASecurityTokenSerivceEndpoint
+        /// Or the token_endpoint in the OIDC metadata.
+        /// </summary>
+        public virtual string TokenEndpoint { get; set; }
     }
 }