src/chrome/browser/supervised_user/supervised_user_shared_settings_service.cc

   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 #include "chrome/browser/supervised_user/supervised_user_shared_settings_service.h"
   6
   7 #include "base/json/json_reader.h"
   8 #include "base/json/json_writer.h"
   9 #include "base/prefs/pref_service.h"
  10 #include "base/prefs/scoped_user_pref_update.h"
  11 #include "base/values.h"
  12 #include "chrome/common/pref_names.h"
  13 #include "components/pref_registry/pref_registry_syncable.h"
  14 #include "sync/api/sync_change.h"
  15 #include "sync/api/sync_data.h"
  16 #include "sync/api/sync_error.h"
  17 #include "sync/api/sync_error_factory.h"
  18 #include "sync/api/sync_merge_result.h"
  19 #include "sync/protocol/sync.pb.h"
  20
  21 using base::DictionaryValue;
  22 using base::Value;
  23 using syncer::ModelType;
  24 using syncer::SUPERVISED_USER_SHARED_SETTINGS;
  25 using syncer::SyncChange;
  26 using syncer::SyncChangeList;
  27 using syncer::SyncChangeProcessor;
  28 using syncer::SyncData;
  29 using syncer::SyncDataList;
  30 using syncer::SyncError;
  31 using syncer::SyncErrorFactory;
  32 using syncer::SyncMergeResult;
  33
  34 namespace {
  35
  36 const char kAcknowledged[] = "acknowledged";
  37 const char kValue[] = "value";
  38
  39 DictionaryValue* FindOrCreateDictionary(DictionaryValue* parent,
  40                                         const std::string& key) {
  41   DictionaryValue* dict = NULL;
  42   if (!parent->GetDictionaryWithoutPathExpansion(key, &dict)) {
  43     dict = new DictionaryValue;
  44     parent->SetWithoutPathExpansion(key, dict);
  45   }
  46   return dict;
  47 }
  48
  49 class ScopedSupervisedUserSharedSettingsUpdate {
  50  public:
  51   ScopedSupervisedUserSharedSettingsUpdate(PrefService* prefs,
  52                                            const std::string& su_id)
  53       : update_(prefs, prefs::kSupervisedUserSharedSettings), su_id_(su_id) {
  54     DCHECK(!su_id.empty());
  55
  56     // A supervised user can only modify their own settings.
  57     std::string id = prefs->GetString(prefs::kSupervisedUserId);
  58     DCHECK(id.empty() || id == su_id);
  59   }
  60
  61   DictionaryValue* Get() {
  62     return FindOrCreateDictionary(update_.Get(), su_id_);
  63   }
  64
  65  private:
  66   DictionaryPrefUpdate update_;
  67   std::string su_id_;
  68 };
  69
  70 SyncData CreateSyncDataForValue(
  71     const std::string& su_id,
  72     const std::string& key,
  73     const Value& dict_value) {
  74   const DictionaryValue* dict = NULL;
  75   if (!dict_value.GetAsDictionary(&dict))
  76     return SyncData();
  77
  78   const Value* value = NULL;
  79   if (!dict->Get(kValue, &value))
  80     return SyncData();
  81
  82   bool acknowledged = false;
  83   dict->GetBoolean(kAcknowledged, &acknowledged);
  84
  85   return SupervisedUserSharedSettingsService::CreateSyncDataForSetting(
  86       su_id, key, *value, acknowledged);
  87 }
  88
  89 }  // namespace
  90
  91
  92 SupervisedUserSharedSettingsService::SupervisedUserSharedSettingsService(
  93     PrefService* prefs)
  94     : prefs_(prefs) {}
  95
  96 SupervisedUserSharedSettingsService::~SupervisedUserSharedSettingsService() {}
  97
  98 void SupervisedUserSharedSettingsService::SetValueInternal(
  99     const std::string& su_id,
 100     const std::string& key,
 101     const Value& value,
 102     bool acknowledged) {
 103   ScopedSupervisedUserSharedSettingsUpdate update(prefs_, su_id);
 104   DictionaryValue* update_dict = update.Get();
 105
 106   DictionaryValue* dict = NULL;
 107   bool has_key = update_dict->GetDictionaryWithoutPathExpansion(key, &dict);
 108   if (!has_key) {
 109     dict = new DictionaryValue;
 110     update_dict->SetWithoutPathExpansion(key, dict);
 111   }
 112   dict->SetWithoutPathExpansion(kValue, value.DeepCopy());
 113   dict->SetBooleanWithoutPathExpansion(kAcknowledged, acknowledged);
 114
 115   if (!sync_processor_)
 116     return;
 117
 118   SyncData data = CreateSyncDataForSetting(su_id, key, value, acknowledged);
 119   SyncChange::SyncChangeType change_type =
 120       has_key ? SyncChange::ACTION_UPDATE : SyncChange::ACTION_ADD;
 121   SyncChangeList changes;
 122   changes.push_back(SyncChange(FROM_HERE, change_type, data));
 123   SyncError error = sync_processor_->ProcessSyncChanges(FROM_HERE, changes);
 124   DCHECK(!error.IsSet()) << error.ToString();
 125 }
 126
 127 const Value* SupervisedUserSharedSettingsService::GetValue(
 128     const std::string& su_id,
 129     const std::string& key) {
 130   const DictionaryValue* data =
 131       prefs_->GetDictionary(prefs::kSupervisedUserSharedSettings);
 132   const DictionaryValue* dict = NULL;
 133   if (!data->GetDictionaryWithoutPathExpansion(su_id, &dict))
 134     return NULL;
 135
 136   const DictionaryValue* settings = NULL;
 137   if (!dict->GetDictionaryWithoutPathExpansion(key, &settings))
 138     return NULL;
 139
 140   const Value* value = NULL;
 141   if (!settings->GetWithoutPathExpansion(kValue, &value))
 142     return NULL;
 143
 144   return value;
 145 }
 146
 147 void SupervisedUserSharedSettingsService::SetValue(
 148     const std::string& su_id,
 149     const std::string& key,
 150     const Value& value) {
 151   SetValueInternal(su_id, key, value, true);
 152 }
 153
 154 scoped_ptr<
 155     SupervisedUserSharedSettingsService::ChangeCallbackList::Subscription>
 156 SupervisedUserSharedSettingsService::Subscribe(
 157     const SupervisedUserSharedSettingsService::ChangeCallback& cb) {
 158   return callbacks_.Add(cb);
 159 }
 160
 161 // static
 162 void SupervisedUserSharedSettingsService::RegisterProfilePrefs(
 163     user_prefs::PrefRegistrySyncable* registry) {
 164   registry->RegisterDictionaryPref(
 165       prefs::kSupervisedUserSharedSettings,
 166       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 167 }
 168
 169 // static
 170 SyncData SupervisedUserSharedSettingsService::CreateSyncDataForSetting(
 171     const std::string& su_id,
 172     const std::string& key,
 173     const Value& value,
 174     bool acknowledged) {
 175   std::string json_value;
 176   base::JSONWriter::Write(&value, &json_value);
 177   ::sync_pb::EntitySpecifics specifics;
 178   specifics.mutable_managed_user_shared_setting()->set_mu_id(su_id);
 179   specifics.mutable_managed_user_shared_setting()->set_key(key);
 180   specifics.mutable_managed_user_shared_setting()->set_value(json_value);
 181   specifics.mutable_managed_user_shared_setting()->set_acknowledged(
 182       acknowledged);
 183   std::string title = su_id + ":" + key;
 184   return SyncData::CreateLocalData(title, title, specifics);
 185 }
 186
 187 void SupervisedUserSharedSettingsService::Shutdown() {}
 188
 189 syncer::SyncMergeResult
 190 SupervisedUserSharedSettingsService::MergeDataAndStartSyncing(
 191     syncer::ModelType type,
 192     const syncer::SyncDataList& initial_sync_data,
 193     scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
 194     scoped_ptr<syncer::SyncErrorFactory> error_handler) {
 195   DCHECK_EQ(SUPERVISED_USER_SHARED_SETTINGS, type);
 196   sync_processor_ = sync_processor.Pass();
 197   error_handler_ = error_handler.Pass();
 198
 199   // We keep a map from MU ID to the set of keys that we have seen in the
 200   // initial sync data.
 201   std::map<std::string, std::set<std::string> > seen_keys;
 202
 203   // Iterate over all initial sync data, and update it locally. This means that
 204   // the value from the server always wins over a local value.
 205   for (SyncDataList::const_iterator it = initial_sync_data.begin();
 206        it != initial_sync_data.end();
 207        ++it) {
 208     DCHECK_EQ(SUPERVISED_USER_SHARED_SETTINGS, it->GetDataType());
 209     const ::sync_pb::ManagedUserSharedSettingSpecifics&
 210         supervised_user_shared_setting =
 211             it->GetSpecifics().managed_user_shared_setting();
 212     scoped_ptr<Value> value(
 213         base::JSONReader::Read(supervised_user_shared_setting.value()));
 214     const std::string& su_id = supervised_user_shared_setting.mu_id();
 215     ScopedSupervisedUserSharedSettingsUpdate update(prefs_, su_id);
 216     const std::string& key = supervised_user_shared_setting.key();
 217     DictionaryValue* dict = FindOrCreateDictionary(update.Get(), key);
 218     dict->SetWithoutPathExpansion(kValue, value.release());
 219
 220     // Every setting we get from the server should have the acknowledged flag
 221     // set.
 222     DCHECK(supervised_user_shared_setting.acknowledged());
 223     dict->SetBooleanWithoutPathExpansion(
 224         kAcknowledged, supervised_user_shared_setting.acknowledged());
 225     callbacks_.Notify(su_id, key);
 226
 227     seen_keys[su_id].insert(key);
 228   }
 229
 230   // Iterate over all settings that we have locally, which includes settings
 231   // that were just synced down. We filter those out using |seen_keys|.
 232   SyncChangeList change_list;
 233   const DictionaryValue* all_settings =
 234       prefs_->GetDictionary(prefs::kSupervisedUserSharedSettings);
 235   for (DictionaryValue::Iterator it(*all_settings); !it.IsAtEnd();
 236        it.Advance()) {
 237     const DictionaryValue* dict = NULL;
 238     bool success = it.value().GetAsDictionary(&dict);
 239     DCHECK(success);
 240
 241     const std::set<std::string>& seen = seen_keys[it.key()];
 242     for (DictionaryValue::Iterator jt(*dict); !jt.IsAtEnd(); jt.Advance()) {
 243       // We only need to upload settings that we haven't seen in the initial
 244       // sync data (which means they were added locally).
 245       if (seen.count(jt.key()) > 0)
 246         continue;
 247
 248       SyncData data = CreateSyncDataForValue(it.key(), jt.key(), jt.value());
 249       DCHECK(data.IsValid());
 250       change_list.push_back(
 251           SyncChange(FROM_HERE, SyncChange::ACTION_ADD, data));
 252     }
 253   }
 254
 255   SyncMergeResult result(SUPERVISED_USER_SHARED_SETTINGS);
 256   // Process all the accumulated changes.
 257   if (change_list.size() > 0) {
 258     result.set_error(
 259         sync_processor_->ProcessSyncChanges(FROM_HERE, change_list));
 260   }
 261
 262   // TODO(bauerb): Statistics?
 263   return result;
 264 }
 265
 266 void SupervisedUserSharedSettingsService::StopSyncing(syncer::ModelType type) {
 267   DCHECK_EQ(SUPERVISED_USER_SHARED_SETTINGS, type);
 268   sync_processor_.reset();
 269   error_handler_.reset();
 270 }
 271
 272 syncer::SyncDataList SupervisedUserSharedSettingsService::GetAllSyncData(
 273     syncer::ModelType type) const {
 274   DCHECK_EQ(SUPERVISED_USER_SHARED_SETTINGS, type);
 275   SyncDataList data;
 276   const DictionaryValue* all_settings =
 277       prefs_->GetDictionary(prefs::kSupervisedUserSharedSettings);
 278   for (DictionaryValue::Iterator it(*all_settings); !it.IsAtEnd();
 279        it.Advance()) {
 280     const DictionaryValue* dict = NULL;
 281     bool success = it.value().GetAsDictionary(&dict);
 282     DCHECK(success);
 283     for (DictionaryValue::Iterator jt(*dict); !jt.IsAtEnd(); jt.Advance()) {
 284       data.push_back(CreateSyncDataForValue(it.key(), jt.key(), jt.value()));
 285     }
 286   }
 287   return data;
 288 }
 289
 290 syncer::SyncError SupervisedUserSharedSettingsService::ProcessSyncChanges(
 291     const tracked_objects::Location& from_here,
 292     const syncer::SyncChangeList& change_list) {
 293   for (SyncChangeList::const_iterator it = change_list.begin();
 294        it != change_list.end();
 295        ++it) {
 296     SyncData data = it->sync_data();
 297     DCHECK_EQ(SUPERVISED_USER_SHARED_SETTINGS, data.GetDataType());
 298     const ::sync_pb::ManagedUserSharedSettingSpecifics&
 299         supervised_user_shared_setting =
 300             data.GetSpecifics().managed_user_shared_setting();
 301     const std::string& key = supervised_user_shared_setting.key();
 302     const std::string& su_id = supervised_user_shared_setting.mu_id();
 303     ScopedSupervisedUserSharedSettingsUpdate update(prefs_, su_id);
 304     DictionaryValue* update_dict = update.Get();
 305     DictionaryValue* dict = NULL;
 306     bool has_key = update_dict->GetDictionaryWithoutPathExpansion(key, &dict);
 307     switch (it->change_type()) {
 308       case SyncChange::ACTION_ADD:
 309       case SyncChange::ACTION_UPDATE: {
 310         // Every setting we get from the server should have the acknowledged
 311         // flag set.
 312         DCHECK(supervised_user_shared_setting.acknowledged());
 313
 314         if (has_key) {
 315           // If the supervised user already exists, it should be an update
 316           // action.
 317           DCHECK_EQ(SyncChange::ACTION_UPDATE, it->change_type());
 318         } else {
 319           // Otherwise, it should be an add action.
 320           DCHECK_EQ(SyncChange::ACTION_ADD, it->change_type());
 321           dict = new DictionaryValue;
 322           update_dict->SetWithoutPathExpansion(key, dict);
 323         }
 324         scoped_ptr<Value> value(
 325             base::JSONReader::Read(supervised_user_shared_setting.value()));
 326         dict->SetWithoutPathExpansion(kValue, value.release());
 327         dict->SetBooleanWithoutPathExpansion(
 328             kAcknowledged, supervised_user_shared_setting.acknowledged());
 329         break;
 330       }
 331       case SyncChange::ACTION_DELETE: {
 332         if (has_key)
 333           update_dict->RemoveWithoutPathExpansion(key, NULL);
 334         else
 335           NOTREACHED() << "Trying to delete nonexistent key " << key;
 336         break;
 337       }
 338       case SyncChange::ACTION_INVALID: {
 339         NOTREACHED();
 340         break;
 341       }
 342     }
 343     callbacks_.Notify(su_id, key);
 344   }
 345
 346   SyncError error;
 347   return error;
 348 }