1// Copyright 2014 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_CONTENT_SETTINGS_CONTENT_SETTINGS_OVERRIDE_PROVIDER_H_
6#define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_OVERRIDE_PROVIDER_H_
7
8#include "base/macros.h"
9#include "base/synchronization/lock.h"
10#include "components/content_settings/core/browser/content_settings_provider.h"
11#include "components/content_settings/core/common/content_settings_types.h"
12
13class ContentSettingsPattern;
14class PrefService;
15
16namespace user_prefs {
17class PrefRegistrySyncable;
18}
19
20namespace content_settings {
21
22// OverrideProvider contains if certain content settings are enabled or
23// globally disabled. It may only be written to using the UI thread, but may be
24// read on any thread.
25class OverrideProvider : public ProviderInterface {
26 public:
27  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
28
29  OverrideProvider(PrefService* prefs, bool incognito);
30  virtual ~OverrideProvider();
31
32  // ProviderInterface implementations.
33  virtual RuleIterator* GetRuleIterator(
34      ContentSettingsType content_type,
35      const ResourceIdentifier& resource_identifier,
36      bool incognito) const OVERRIDE;
37
38  virtual void ClearAllContentSettingsRules(
39      ContentSettingsType content_type) OVERRIDE;
40
41  virtual bool SetWebsiteSetting(
42      const ContentSettingsPattern& primary_pattern,
43      const ContentSettingsPattern& secondary_pattern,
44      ContentSettingsType content_type,
45      const ResourceIdentifier& resource_identifier,
46      base::Value* value) OVERRIDE;
47
48  virtual void ShutdownOnUIThread() OVERRIDE;
49
50  // Sets if a given |content_type| is |enabled|.
51  void SetOverrideSetting(ContentSettingsType content_type, bool enabled);
52
53  // Returns if |content_type| is enabled. If it is not enabled, the content
54  // setting type is considered globally disabled and acts as though it is
55  // blocked. If it is enabled, the content setting type's permission is granted
56  // by the other providers.
57  bool IsEnabled(ContentSettingsType content_type) const;
58
59 private:
60  // Reads the override settings from the preferences service.
61  void ReadOverrideSettings();
62
63  // Copies of the pref data, so that we can read it on the IO thread.
64  bool allowed_settings_[CONTENT_SETTINGS_NUM_TYPES];
65
66  PrefService* prefs_;
67
68  bool is_incognito_;
69
70  // Used around accesses to the |override_content_settings_| object to
71  // guarantee thread safety.
72  mutable base::Lock lock_;
73
74  DISALLOW_COPY_AND_ASSIGN(OverrideProvider);
75};
76
77}  // namespace content_settings
78
79#endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_OVERRIDE_PROVIDER_H_
80