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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef REMOTING_HOST_SETUP_OAUTH_CLIENT
      6 #define REMOTING_HOST_SETUP_OAUTH_CLIENT
      7 
      8 #include <queue>
      9 #include <string>
     10 
     11 #include "base/callback.h"
     12 #include "google_apis/gaia/gaia_oauth_client.h"
     13 #include "remoting/base/url_request_context.h"
     14 
     15 namespace remoting {
     16 
     17 // A wrapper around GaiaOAuthClient that provides a more convenient interface,
     18 // with queueing of requests and a callback rather than a delegate.
     19 class OAuthClient : public gaia::GaiaOAuthClient::Delegate {
     20  public:
     21   // Called when GetCredentialsFromAuthCode is completed, with the |user_email|
     22   // and |refresh_token| that correspond to the given |auth_code|, or with empty
     23   // strings on error.
     24   typedef base::Callback<void(
     25       const std::string& user_email,
     26       const std::string& refresh_token)> CompletionCallback;
     27 
     28   OAuthClient(
     29       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
     30 
     31   virtual ~OAuthClient();
     32 
     33   // Redeems |auth_code| using |oauth_client_info| to obtain |refresh_token| and
     34   // |access_token|, then uses the userinfo endpoint to obtain |user_email|.
     35   // Calls CompletionCallback with |user_email| and |refresh_token| when done,
     36   // or with empty strings on error.
     37   // If a request is received while another one is  being processed, it is
     38   // enqueued and processed after the first one is finished.
     39   void GetCredentialsFromAuthCode(
     40       const gaia::OAuthClientInfo& oauth_client_info,
     41       const std::string& auth_code,
     42       CompletionCallback on_done);
     43 
     44   // gaia::GaiaOAuthClient::Delegate
     45   virtual void OnGetTokensResponse(const std::string& refresh_token,
     46                                  const std::string& access_token,
     47                                  int expires_in_seconds) OVERRIDE;
     48   virtual void OnRefreshTokenResponse(const std::string& access_token,
     49                                       int expires_in_seconds) OVERRIDE;
     50   virtual void OnGetUserEmailResponse(const std::string& user_email) OVERRIDE;
     51 
     52   virtual void OnOAuthError() OVERRIDE;
     53   virtual void OnNetworkError(int response_code) OVERRIDE;
     54 
     55  private:
     56   struct Request {
     57     Request(const gaia::OAuthClientInfo& oauth_client_info,
     58             const std::string& auth_code,
     59             CompletionCallback on_done);
     60     virtual ~Request();
     61     gaia::OAuthClientInfo oauth_client_info;
     62     std::string auth_code;
     63     CompletionCallback on_done;
     64   };
     65 
     66   void SendResponse(const std::string& user_email,
     67                     const std::string& refresh_token);
     68 
     69   std::queue<Request> pending_requests_;
     70   gaia::GaiaOAuthClient gaia_oauth_client_;
     71   std::string refresh_token_;
     72   CompletionCallback on_done_;
     73 
     74   DISALLOW_COPY_AND_ASSIGN(OAuthClient);
     75 };
     76 
     77 }  // namespace remoting
     78 
     79 #endif  // REMOTING_HOST_SETUP_OAUTH_CLIENT
     80