chrome/browser/content_settings/content_settings_override_provider.h

   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
  13 class ContentSettingsPattern;
  14 class PrefService;
  15
  16 namespace user_prefs {
  17 class PrefRegistrySyncable;
  18 }
  19
  20 namespace 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.
  25 class 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_