external_policy_loader.h revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1// Copyright (c) 2012 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_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
6#define CHROME_BROWSER_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
7
8#include <string>
9
10#include "base/compiler_specific.h"
11#include "base/prefs/pref_change_registrar.h"
12#include "chrome/browser/extensions/external_loader.h"
13#include "content/public/browser/notification_observer.h"
14#include "content/public/browser/notification_registrar.h"
15
16class Profile;
17
18namespace base {
19class DictionaryValue;
20}
21
22namespace extensions {
23
24// A specialization of the ExternalProvider that uses
25// pref_names::kInstallForceList to look up which external extensions are
26// registered.
27class ExternalPolicyLoader
28    : public ExternalLoader,
29      public content::NotificationObserver {
30 public:
31  explicit ExternalPolicyLoader(Profile* profile);
32
33  // content::NotificationObserver implementation
34  virtual void Observe(int type,
35                       const content::NotificationSource& source,
36                       const content::NotificationDetails& details) OVERRIDE;
37
38  // Adds an extension to be updated to the pref dictionary.
39  static void AddExtension(base::DictionaryValue* dict,
40                           const std::string& extension_id,
41                           const std::string& update_url);
42
43 protected:
44  virtual void StartLoading() OVERRIDE;
45
46 private:
47  friend class base::RefCountedThreadSafe<ExternalLoader>;
48
49  virtual ~ExternalPolicyLoader() {}
50
51  PrefChangeRegistrar pref_change_registrar_;
52  content::NotificationRegistrar notification_registrar_;
53
54  Profile* profile_;
55
56  DISALLOW_COPY_AND_ASSIGN(ExternalPolicyLoader);
57};
58
59}  // namespace extensions
60
61#endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
62