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 "base/memory/ref_counted.h"
13#include "google_apis/gaia/gaia_oauth_client.h"
14#include "net/url_request/url_request_context_getter.h"
15
16namespace net {
17class URLRequestContext;
18}
19
20namespace remoting {
21
22// A wrapper around GaiaOAuthClient that provides a more convenient interface,
23// with queueing of requests and a callback rather than a delegate.
24class OAuthClient : public gaia::GaiaOAuthClient::Delegate {
25 public:
26  // Called when GetCredentialsFromAuthCode is completed, with the |user_email|
27  // and |refresh_token| that correspond to the given |auth_code|, or with empty
28  // strings on error.
29  typedef base::Callback<void(
30      const std::string& user_email,
31      const std::string& refresh_token)> CompletionCallback;
32
33  OAuthClient(
34      scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
35
36  virtual ~OAuthClient();
37
38  // Redeems |auth_code| using |oauth_client_info| to obtain |refresh_token| and
39  // |access_token|, then uses the userinfo endpoint to obtain |user_email|.
40  // Calls CompletionCallback with |user_email| and |refresh_token| when done,
41  // or with empty strings on error.
42  // If a request is received while another one is  being processed, it is
43  // enqueued and processed after the first one is finished.
44  void GetCredentialsFromAuthCode(
45      const gaia::OAuthClientInfo& oauth_client_info,
46      const std::string& auth_code,
47      CompletionCallback on_done);
48
49  // gaia::GaiaOAuthClient::Delegate
50  virtual void OnGetTokensResponse(const std::string& refresh_token,
51                                 const std::string& access_token,
52                                 int expires_in_seconds) OVERRIDE;
53  virtual void OnRefreshTokenResponse(const std::string& access_token,
54                                      int expires_in_seconds) OVERRIDE;
55  virtual void OnGetUserEmailResponse(const std::string& user_email) OVERRIDE;
56
57  virtual void OnOAuthError() OVERRIDE;
58  virtual void OnNetworkError(int response_code) OVERRIDE;
59
60 private:
61  struct Request {
62    Request(const gaia::OAuthClientInfo& oauth_client_info,
63            const std::string& auth_code,
64            CompletionCallback on_done);
65    virtual ~Request();
66    gaia::OAuthClientInfo oauth_client_info;
67    std::string auth_code;
68    CompletionCallback on_done;
69  };
70
71  void SendResponse(const std::string& user_email,
72                    const std::string& refresh_token);
73
74  std::queue<Request> pending_requests_;
75  gaia::GaiaOAuthClient gaia_oauth_client_;
76  std::string refresh_token_;
77  CompletionCallback on_done_;
78
79  DISALLOW_COPY_AND_ASSIGN(OAuthClient);
80};
81
82}  // namespace remoting
83
84#endif  // REMOTING_HOST_SETUP_OAUTH_CLIENT
85