device_id_fetcher.h revision 1e9bf3e0803691d0a228da41fc608347b6db4340 
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_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
6#define CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_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/files/file_path.h"
14#include "base/memory/ref_counted.h"
15#include "ppapi/c/pp_instance.h"
16
17class Profile;
18
19namespace content {
20class BrowserPpapiHost;
21}
22
23namespace user_prefs {
24class PrefRegistrySyncable;
25}
26
27namespace chrome {
28
29// This class allows asynchronously fetching a unique device ID. The callback
30// passed in when calling Start() will be called when the ID has been fetched
31// or on error.
32class DeviceIDFetcher : public base::RefCountedThreadSafe<DeviceIDFetcher> {
33 public:
34  typedef base::Callback<void(const std::string&, int32_t)> IDCallback;
35
36  explicit DeviceIDFetcher(int render_process_id);
37
38  // Schedules the request operation. Returns false if a request is in progress,
39  // true otherwise.
40  bool Start(const IDCallback& callback);
41
42  // Called to register the |kEnableDRM| and |kDRMSalt| preferences.
43  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* prefs);
44
45  // Return the path where the legacy device ID is stored (for ChromeOS only).
46  static base::FilePath GetLegacyDeviceIDPath(
47      const base::FilePath& profile_path);
48
49 private:
50  ~DeviceIDFetcher();
51
52  // Checks the preferences for DRM (whether DRM is enabled and getting the drm
53  // salt) on the UI thread.
54  void CheckPrefsOnUIThread();
55
56  // Compute the device ID on the UI thread with the given salt and machine ID.
57  void ComputeOnUIThread(const std::string& salt,
58                         const std::string& machine_id);
59
60  // Legacy method used to get the device ID for ChromeOS.
61  void LegacyComputeOnBlockingPool(const base::FilePath& profile_path,
62                                   const std::string& salt);
63
64  // Runs the callback passed into Start() on the IO thread with the device ID
65  // or the empty string on failure.
66  void RunCallbackOnIOThread(const std::string& id,
67                             int32_t result);
68
69  friend class base::RefCountedThreadSafe<DeviceIDFetcher>;
70
71  // The callback to run when the ID has been fetched.
72  IDCallback callback_;
73
74  // Whether a request is in progress.
75  bool in_progress_;
76
77  int render_process_id_;
78
79  DISALLOW_COPY_AND_ASSIGN(DeviceIDFetcher);
80};
81
82}  // namespace chrome
83
84#endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
85