Reimplement OAuth2 library - Step 1

Src/GoogleApis.Authentication.OAuth2/OAuth2Authenticator.cs

 /*
 Copyright 2011 Google Inc
 
 Licensed under the Apache License, Version 2.0(the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
 
 using System;
 using System.Net;
 using System.Net.Http;
+using System.Threading.Tasks;
 
 using DotNetOpenAuth.OAuth2;
 
 using Google.Apis.Http;
 using Google.Apis.Requests;
 using Google.Apis.Util;
 
 namespace Google.Apis.Authentication.OAuth2
 {
 /// <summary> Implements an OAuth2 authenticator using the DotNetOpenAuth li
brary. </summary>
 public class OAuth2Authenticator<TClient> : IAuthenticator, IHttpUnsuccessfu
lResponseHandler
 where TClient : ClientBase
 {
 private readonly Func<TClient, IAuthorizationState> authProvider;
 private readonly TClient tokenProvider;
 private bool noCaching;
 
- /// <summary>
- /// Creates a new OAuth2 authenticator.
- /// </summary>
+ /// <summary>Creates a new OAuth2 authenticator.</summary>
 /// <param name="tokenProvider">The client which is used for requesting
access and refresh tokens.</param>
 /// <param name="authProvider">The method which provides the initial aut
horization for the provider.</param>
 public OAuth2Authenticator(TClient tokenProvider,
 Func<TClient, IAuthorizationState> authProvid
er)
 {
 tokenProvider.ThrowIfNull("applicationName");
 authProvider.ThrowIfNull("authProvider");
 
 this.tokenProvider = tokenProvider;
 this.authProvider = authProvider;
 }
 
- /// <summary>
- /// The current state of this authenticator
- /// </summary>
+ /// <summary>The current state of this authenticator.</summary>
 public IAuthorizationState State { get; private set; }
 
 /// <summary>
 /// If this option is set to true, the authorization state will only las
t for a single request, and
 /// authorization will be re-requested for every additional request.
 /// </summary>
 /// <remarks>
 /// Will clear the current state if set to true. Can be used by Webserve
r-Applications
 /// to allow multiple AuthorizationStates/users.
 /// </remarks>
@@ skipping 53 matching lines @@
 finally
 {
 if (NoCaching)
 {
 State = null;
 }
 }
 }
 
 /// <summary>·
- /// Override handle response to refresh the token when Unauthorized stat
 us code is received.·
+ /// Overrides handle response to refresh the token when Unauthorized sta
 tus code is received.·
 /// </summary>
- public bool HandleResponse(HandleUnsuccessfulResponseArgs args)
+ public Task<bool> HandleResponseAsync(HandleUnsuccessfulResponseArgs arg
 s)
 {
- return args.Response.StatusCode == HttpStatusCode.Unauthorized && to
 kenProvider.RefreshToken(State, null);
+ var result = args.Response.StatusCode == HttpStatusCode.Unauthorized
  &&
+ tokenProvider.RefreshToken(State, null);
+
+ TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();
+ tcs.SetResult(result);
+ return tcs.Task;
 }
 }
 }