Make middleware report when auth fails (async).

Author: Tratcher

src/Microsoft.AspNet.Security/Infrastructure/AuthenticationHandler.cs

@@ -153,20 +153,6 @@ public virtual void Authenticate(IAuthenticateContext context)
             }
         }
 
-        public AuthenticationTicket Authenticate()
-        {
-            return LazyInitializer.EnsureInitialized(
-                ref _authenticate,
-                ref _authenticateInitialized,
-                ref _authenticateSyncLock,
-                () =>
-                {
-                    return Task.FromResult(AuthenticateCore());
-                }).Result;
-        }
-
-        protected abstract AuthenticationTicket AuthenticateCore();
-
         public virtual async Task AuthenticateAsync(IAuthenticateContext context)
         {
             if (context.AuthenticationTypes.Contains(BaseOptions.AuthenticationType, StringComparer.Ordinal))
@@ -176,6 +162,10 @@ public virtual async Task AuthenticateAsync(IAuthenticateContext context)
                 {
                     context.Authenticated(ticket.Identity, ticket.Properties.Dictionary, BaseOptions.Description.Dictionary);
                 }
+                else
+                {
+                    context.NotAuthenticated(BaseOptions.AuthenticationType, properties: null, description: BaseOptions.Description.Dictionary);
+                }
             }
 
             if (PriorHandler != null)
@@ -184,6 +174,20 @@ public virtual async Task AuthenticateAsync(IAuthenticateContext context)
             }
         }
 
+        public AuthenticationTicket Authenticate()
+        {
+            return LazyInitializer.EnsureInitialized(
+                ref _authenticate,
+                ref _authenticateInitialized,
+                ref _authenticateSyncLock,
+                () =>
+                {
+                    return Task.FromResult(AuthenticateCore());
+                }).Result;
+        }
+
+        protected abstract AuthenticationTicket AuthenticateCore();
+
         /// <summary>
         /// Causes the authentication logic in AuthenticateCore to be performed for the current request 
         /// at most once and returns the results. Calling Authenticate more than once will always return