1// Copyright (c) 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 CHROME_BROWSER_CHROMEOS_POLICY_POLICY_OAUTH2_TOKEN_FETCHER_H_
6#define CHROME_BROWSER_CHROMEOS_POLICY_POLICY_OAUTH2_TOKEN_FETCHER_H_
7
8#include <string>
9
10#include "base/basictypes.h"
11#include "base/callback.h"
12#include "base/compiler_specific.h"
13#include "base/memory/ref_counted.h"
14#include "base/memory/scoped_ptr.h"
15#include "base/memory/weak_ptr.h"
16#include "google_apis/gaia/gaia_auth_consumer.h"
17#include "google_apis/gaia/oauth2_access_token_consumer.h"
18
19class GaiaAuthFetcher;
20class OAuth2AccessTokenFetcher;
21
22namespace net {
23class URLRequestContextGetter;
24}
25
26namespace policy {
27
28// Fetches the OAuth2 token for the device management service. Since Profile
29// creation might be blocking on a user policy fetch, this fetcher must always
30// send a (possibly empty) token to the callback, which will then let the policy
31// subsystem proceed and resume Profile creation. Sending the token even when no
32// Profile is pending is also OK.
33class PolicyOAuth2TokenFetcher
34    : public base::SupportsWeakPtr<PolicyOAuth2TokenFetcher>,
35      public GaiaAuthConsumer,
36      public OAuth2AccessTokenConsumer {
37 public:
38  typedef base::Callback<void(const std::string&,
39                              const GoogleServiceAuthError&)> TokenCallback;
40
41  // Fetches the device management service's oauth2 token, after also retrieving
42  // the OAuth2 refresh tokens.
43  PolicyOAuth2TokenFetcher(net::URLRequestContextGetter* auth_context_getter,
44                           net::URLRequestContextGetter* system_context_getter,
45                           const TokenCallback& callback);
46
47  virtual ~PolicyOAuth2TokenFetcher();
48
49  // Starts process of minting device management service OAuth2 access token.
50  void Start();
51
52  // Returns true if we have previously attempted to fetch tokens with this
53  // class and failed.
54  bool failed() const {
55    return failed_;
56  }
57
58  const std::string& oauth2_refresh_token() const {
59    return oauth2_refresh_token_;
60  }
61  const std::string& oauth2_access_token() const {
62    return oauth2_access_token_;
63  }
64
65 private:
66  // GaiaAuthConsumer overrides.
67  virtual void OnClientOAuthSuccess(
68      const GaiaAuthConsumer::ClientOAuthResult& oauth_tokens) OVERRIDE;
69  virtual void OnClientOAuthFailure(
70      const GoogleServiceAuthError& error) OVERRIDE;
71
72  // OAuth2AccessTokenConsumer overrides.
73  virtual void OnGetTokenSuccess(const std::string& access_token,
74                                 const base::Time& expiration_time) OVERRIDE;
75  virtual void OnGetTokenFailure(const GoogleServiceAuthError& error) OVERRIDE;
76
77  // Starts fetching OAuth2 refresh token.
78  void StartFetchingRefreshToken();
79
80  // Starts fetching OAuth2 access token for the device management service.
81  void StartFetchingAccessToken();
82
83  // Decides how to proceed on GAIA |error|. If the error looks temporary,
84  // retries |task| until max retry count is reached.
85  // If retry count runs out, or error condition is unrecoverable, it calls
86  // Delegate::OnOAuth2TokenFetchFailed().
87  void RetryOnError(const GoogleServiceAuthError& error,
88                    const base::Closure& task);
89
90  // Passes |token| and |error| to the |callback_|.
91  void ForwardPolicyToken(const std::string& token,
92                          const GoogleServiceAuthError& error);
93
94  scoped_refptr<net::URLRequestContextGetter> auth_context_getter_;
95  scoped_refptr<net::URLRequestContextGetter> system_context_getter_;
96  scoped_ptr<GaiaAuthFetcher> refresh_token_fetcher_;
97  scoped_ptr<OAuth2AccessTokenFetcher> access_token_fetcher_;
98
99  // OAuth2 refresh token. Could come either from the outside or through
100  // refresh token fetching flow within this class.
101  std::string oauth2_refresh_token_;
102
103  // OAuth2 access token.
104  std::string oauth2_access_token_;
105
106  // The retry counter. Increment this only when failure happened.
107  int retry_count_;
108
109  // True if we have already failed to fetch the policy.
110  bool failed_;
111
112  // The callback to invoke when done.
113  TokenCallback callback_;
114
115  DISALLOW_COPY_AND_ASSIGN(PolicyOAuth2TokenFetcher);
116};
117
118}  // namespace policy
119
120#endif  // CHROME_BROWSER_CHROMEOS_POLICY_POLICY_OAUTH2_TOKEN_FETCHER_H_
121