chrome/browser/search_engines/default_search_pref_migration.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/search_engines/default_search_pref_migration.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/prefs/pref_service.h"
  13 #include "components/search_engines/default_search_manager.h"
  14 #include "components/search_engines/search_engines_pref_names.h"
  15 #include "components/search_engines/template_url_data.h"
  16 #include "components/search_engines/template_url_service.h"
  17
  18 namespace {
  19
  20 // Loads the user-selected DSE (if there is one, and it's not masked by policy
  21 // or an extension) from legacy preferences.
  22 scoped_ptr<TemplateURLData> LoadDefaultSearchProviderFromPrefs(
  23     PrefService* pref_service) {
  24   scoped_ptr<TemplateURLData> legacy_dse_from_prefs;
  25   bool legacy_is_managed = false;
  26   TemplateURLService::LoadDefaultSearchProviderFromPrefs(
  27       pref_service, &legacy_dse_from_prefs, &legacy_is_managed);
  28   return legacy_is_managed ?
  29       scoped_ptr<TemplateURLData>() : legacy_dse_from_prefs.Pass();
  30 }
  31
  32 void ClearDefaultSearchProviderFromLegacyPrefs(PrefService* prefs) {
  33   prefs->ClearPref(prefs::kDefaultSearchProviderName);
  34   prefs->ClearPref(prefs::kDefaultSearchProviderKeyword);
  35   prefs->ClearPref(prefs::kDefaultSearchProviderSearchURL);
  36   prefs->ClearPref(prefs::kDefaultSearchProviderSuggestURL);
  37   prefs->ClearPref(prefs::kDefaultSearchProviderInstantURL);
  38   prefs->ClearPref(prefs::kDefaultSearchProviderImageURL);
  39   prefs->ClearPref(prefs::kDefaultSearchProviderNewTabURL);
  40   prefs->ClearPref(prefs::kDefaultSearchProviderSearchURLPostParams);
  41   prefs->ClearPref(prefs::kDefaultSearchProviderSuggestURLPostParams);
  42   prefs->ClearPref(prefs::kDefaultSearchProviderInstantURLPostParams);
  43   prefs->ClearPref(prefs::kDefaultSearchProviderImageURLPostParams);
  44   prefs->ClearPref(prefs::kDefaultSearchProviderIconURL);
  45   prefs->ClearPref(prefs::kDefaultSearchProviderEncodings);
  46   prefs->ClearPref(prefs::kDefaultSearchProviderPrepopulateID);
  47   prefs->ClearPref(prefs::kDefaultSearchProviderAlternateURLs);
  48   prefs->ClearPref(prefs::kDefaultSearchProviderSearchTermsReplacementKey);
  49 }
  50
  51 void MigrateDefaultSearchPref(PrefService* pref_service) {
  52   DCHECK(pref_service);
  53
  54   scoped_ptr<TemplateURLData> legacy_dse_from_prefs =
  55       LoadDefaultSearchProviderFromPrefs(pref_service);
  56   if (!legacy_dse_from_prefs)
  57     return;
  58
  59   DefaultSearchManager default_search_manager(
  60       pref_service, DefaultSearchManager::ObserverCallback());
  61   DefaultSearchManager::Source modern_source;
  62   TemplateURLData* modern_value =
  63       default_search_manager.GetDefaultSearchEngine(&modern_source);
  64   if (modern_source == DefaultSearchManager::FROM_FALLBACK) {
  65     // |modern_value| is the prepopulated default. If it matches the legacy DSE
  66     // we assume it is not a user-selected value.
  67     if (!modern_value ||
  68         legacy_dse_from_prefs->prepopulate_id != modern_value->prepopulate_id) {
  69       // This looks like a user-selected value, so let's migrate it.
  70       // TODO(erikwright): Remove this migration logic when this stat approaches
  71       // zero.
  72       UMA_HISTOGRAM_BOOLEAN("Search.MigratedPrefToDictionaryValue", true);
  73       default_search_manager.SetUserSelectedDefaultSearchEngine(
  74           *legacy_dse_from_prefs);
  75     }
  76   }
  77
  78   ClearDefaultSearchProviderFromLegacyPrefs(pref_service);
  79 }
  80
  81 void OnPrefsInitialized(PrefService* pref_service,
  82                         bool pref_service_initialization_success) {
  83   MigrateDefaultSearchPref(pref_service);
  84 }
  85
  86 }  // namespace
  87
  88 void ConfigureDefaultSearchPrefMigrationToDictionaryValue(
  89     PrefService* pref_service) {
  90   if (pref_service->GetInitializationStatus() ==
  91       PrefService::INITIALIZATION_STATUS_WAITING) {
  92     pref_service->AddPrefInitObserver(
  93         base::Bind(&OnPrefsInitialized, base::Unretained(pref_service)));
  94   } else {
  95     MigrateDefaultSearchPref(pref_service);
  96   }
  97 }