Reimplement OAuth2 library - Step 1

Src/GoogleApis/Apis/Authentication/AuthenticatorHelpers.cs

 /*
 Copyright 2013 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.Collections.Generic;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
 
 using Google.Apis.Http;
 using Google.Apis.Testing;
 
 namespace Google.Apis.Authentication
 {
 // TODO(peleyal): this class should be removed when implementing our OAuth2
library. Our future credential
 // object will implement both IHttpExecuteInterceptor and IHttpUnsuccessfulR
esponseHandler
 [VisibleForTestOnly]
 internal class AuthenticatorInterceptor : IHttpExecuteInterceptor
 {
 private IAuthenticator Authenticator { get; set; }
 
 /// <summary> Constructs a new Authenticator interceptor. </summary>
 public AuthenticatorInterceptor(IAuthenticator authenticator)
 {
 Authenticator = authenticator;
 }
 
- public void Intercept(HttpRequestMessage request)
+ public Task InterceptAsync(HttpRequestMessage request, CancellationToken
  cancellationToken)
 {
 // we create a regular WebHttpRequest because our Authenticator (and
DotNetOpenAuth) implementation
 // works with it only.·
 // We are going to create our own OAuth2 implementation and as a res
ult this hack will be removed!
 var authorization = HttpRequestHeader.Authorization.ToString();
 var request2 = WebRequest.Create("http://www.hack.com") as HttpWebRe
quest;
 Authenticator.ApplyAuthenticationToRequest(request2);
 if (request2.Headers[authorization] != null)
 {
 request.Headers.Remove(authorization);
 request.Headers.Add(authorization, request2.Headers[authorizatio
n]);
 }
+
+return TaskEx.Delay(0);
 }
 }
 
 // TODO(peleyal): this class should be removed when implementing our OAuth2
library. Our future credential
 // object will implement both IHttpExecuteInterceptor and IHttpUnsuccessfulR
esponseHandler
 internal class AuthenticatorMessageHandlerInitializer : IConfigurableHttpCli
entInitializer
 {
 private IAuthenticator Authenticator { get; set; }
 
 /// <summary> Constructs a new Authenticator message handler initializer
. </summary>
 public AuthenticatorMessageHandlerInitializer(IAuthenticator authenticat
or)
 {
 Authenticator = authenticator;
 }
 
 public void Initialize(ConfigurableHttpClient httpClient)
 {
 httpClient.MessageHandler.ExecuteInterceptors.Add(new AuthenticatorI
nterceptor(Authenticator));
 var unsuccessfulHandler = Authenticator as IHttpUnsuccessfulResponse
Handler;
 if (unsuccessfulHandler != null)
 {
 httpClient.MessageHandler.UnsuccessfulResponseHandlers.Add(unsuc
cessfulHandler);
 }
 }
 }
 }