chrome/browser/content_settings/content_settings_default_provider.h

   1 // Copyright (c) 2011 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_DEFAULT_PROVIDER_H_
   6 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/memory/linked_ptr.h"
  14 #include "base/prefs/pref_change_registrar.h"
  15 #include "base/synchronization/lock.h"
  16 #include "chrome/browser/content_settings/content_settings_observable_provider.h"
  17
  18 class PrefService;
  19
  20 namespace user_prefs {
  21 class PrefRegistrySyncable;
  22 }
  23
  24 namespace content_settings {
  25
  26 // Provider that provides default content settings based on
  27 // user prefs. If no default values are set by the user we use the hard coded
  28 // default values.
  29 class DefaultProvider : public ObservableProvider {
  30  public:
  31   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  32
  33   DefaultProvider(PrefService* prefs,
  34                   bool incognito);
  35   virtual ~DefaultProvider();
  36
  37   // ProviderInterface implementations.
  38   virtual RuleIterator* GetRuleIterator(
  39       ContentSettingsType content_type,
  40       const ResourceIdentifier& resource_identifier,
  41       bool incognito) const OVERRIDE;
  42
  43   virtual bool SetWebsiteSetting(
  44       const ContentSettingsPattern& primary_pattern,
  45       const ContentSettingsPattern& secondary_pattern,
  46       ContentSettingsType content_type,
  47       const ResourceIdentifier& resource_identifier,
  48       base::Value* value) OVERRIDE;
  49
  50   virtual void ClearAllContentSettingsRules(
  51       ContentSettingsType content_type) OVERRIDE;
  52
  53   virtual void ShutdownOnUIThread() OVERRIDE;
  54
  55  private:
  56   // Sets the fields of |settings| based on the values in |dictionary|.
  57   void GetSettingsFromDictionary(const base::DictionaryValue* dictionary);
  58
  59   // Forces the default settings to be explicitly set instead of themselves
  60   // being CONTENT_SETTING_DEFAULT.
  61   void ForceDefaultsToBeExplicit();
  62
  63   // Reads the default settings from the preferences service. If |overwrite| is
  64   // true and the preference is missing, the local copy will be cleared as well.
  65   void ReadDefaultSettings(bool overwrite);
  66
  67   // Called on prefs change.
  68   void OnPreferenceChanged(const std::string& pref_name);
  69
  70   typedef linked_ptr<base::Value> ValuePtr;
  71   typedef std::map<ContentSettingsType, ValuePtr> ValueMap;
  72   // Copies of the pref data, so that we can read it on the IO thread.
  73   ValueMap default_settings_;
  74
  75   PrefService* prefs_;
  76
  77   // Whether this settings map is for an Incognito session.
  78   bool is_incognito_;
  79
  80   // Used around accesses to the |default_content_settings_| object to guarantee
  81   // thread safety.
  82   mutable base::Lock lock_;
  83
  84   PrefChangeRegistrar pref_change_registrar_;
  85
  86   // Whether we are currently updating preferences, this is used to ignore
  87   // notifications from the preferences service that we triggered ourself.
  88   bool updating_preferences_;
  89
  90   DISALLOW_COPY_AND_ASSIGN(DefaultProvider);
  91 };
  92
  93 }  // namespace content_settings
  94
  95 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_