chrome/browser/supervised_user/legacy/supervised_user_shared_settings_service.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_SUPERVISED_USER_LEGACY_SUPERVISED_USER_SHARED_SETTINGS_SERVICE_H_
   6 #define CHROME_BROWSER_SUPERVISED_USER_LEGACY_SUPERVISED_USER_SHARED_SETTINGS_SERVICE_H_
   7
   8 #include <string>
   9
  10 #include "base/callback.h"
  11 #include "base/callback_list.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "chrome/browser/supervised_user/supervised_users.h"
  14 #include "components/keyed_service/core/keyed_service.h"
  15 #include "sync/api/syncable_service.h"
  16
  17 class PrefService;
  18
  19 namespace base {
  20 class DictionaryValue;
  21 class Value;
  22 }
  23
  24 namespace user_prefs {
  25 class PrefRegistrySyncable;
  26 }
  27
  28 // SupervisedUserSharedSettingsService syncs settings (as key-value pairs) that
  29 // can be modified both by a supervised user and their manager.
  30 // A supervised user can only modify their own settings, whereas a manager can
  31 // modify settings for all their supervised users.
  32 //
  33 // The shared settings are stored in the user preferences in a multi-level
  34 // dictionary. The first level is the SU ID (called "managed user ID" on the
  35 // server for historic reasons), the second level is the key for the setting,
  36 // and the third level is a dictionary with a "value" key for the value and an
  37 // "acknowledged" flag, which is used to wait for the Sync server to acknowledge
  38 // that it has seen a setting change (see SupervisedUserSharedSettingsUpdate for
  39 // how to use this).
  40 class SupervisedUserSharedSettingsService : public KeyedService,
  41                                             public syncer::SyncableService {
  42  public:
  43   // Called whenever a setting changes (see Subscribe() below).
  44   typedef base::Callback<void(const std::string& /* su_id */,
  45                               const std::string& /* key */)> ChangeCallback;
  46   typedef base::CallbackList<
  47       void(const std::string& /* su_id */, const std::string& /* key */)>
  48       ChangeCallbackList;
  49
  50   // This constructor is public only for testing. Use
  51   // |SupervisedUserSharedSettingsServiceFactory::GetForProfile(...)| instead to
  52   // get an instance of this service in production code.
  53   explicit SupervisedUserSharedSettingsService(PrefService* prefs);
  54   ~SupervisedUserSharedSettingsService() override;
  55
  56   // Returns the value for the given |key| and the supervised user identified by
  57   // |su_id|. If either the supervised user or the key does not exist, NULL is
  58   // returned. Note that if the profile that owns this service belongs to a
  59   // supervised user, callers will only see settings for their own |su_id|, i.e.
  60   // a non-matching |su_id| is treated as non-existent.
  61   const base::Value* GetValue(const std::string& su_id, const std::string& key);
  62
  63   // Sets the value for the given |key| and the supervised user identified by
  64   // |su_id|. If the profile that owns this service belongs to a supervised
  65   // user, |su_id| must be their own.
  66   void SetValue(const std::string& su_id,
  67                 const std::string& key,
  68                 const base::Value& value);
  69
  70   // Subscribes to changes in the synced settings. The callback will be notified
  71   // whenever any setting for any supervised user is changed via Sync (but not
  72   // for local changes). Subscribers should filter the settings and users they
  73   // are interested in with the |su_id| and |key| parameters to the callback.
  74   scoped_ptr<ChangeCallbackList::Subscription> Subscribe(
  75       const ChangeCallback& cb);
  76
  77   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  78
  79   // Public for testing.
  80   void SetValueInternal(const std::string& su_id,
  81                         const std::string& key,
  82                         const base::Value& value,
  83                         bool acknowledged);
  84
  85   // Public for testing.
  86   static syncer::SyncData CreateSyncDataForSetting(const std::string& su_id,
  87                                                    const std::string& key,
  88                                                    const base::Value& value,
  89                                                    bool acknowledged);
  90
  91   // KeyedService implementation:
  92   void Shutdown() override;
  93
  94   // SyncableService implementation:
  95   syncer::SyncMergeResult MergeDataAndStartSyncing(
  96       syncer::ModelType type,
  97       const syncer::SyncDataList& initial_sync_data,
  98       scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
  99       scoped_ptr<syncer::SyncErrorFactory> error_handler) override;
 100   void StopSyncing(syncer::ModelType type) override;
 101   syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const override;
 102   syncer::SyncError ProcessSyncChanges(
 103       const tracked_objects::Location& from_here,
 104       const syncer::SyncChangeList& change_list) override;
 105
 106  private:
 107   scoped_ptr<syncer::SyncChangeProcessor> sync_processor_;
 108   scoped_ptr<syncer::SyncErrorFactory> error_handler_;
 109
 110   ChangeCallbackList callbacks_;
 111
 112   PrefService* prefs_;
 113 };
 114
 115 #endif  // CHROME_BROWSER_SUPERVISED_USER_LEGACY_SUPERVISED_USER_SHARED_SETTINGS_SERVICE_H_