Remove old default search preferences.

components/search_engines/default_search_pref_migration.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "components/search_engines/default_search_pref_migration.h"
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/logging.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
-#include "base/strings/utf_string_conversions.h"
-#include "components/prefs/pref_service.h"
-#include "components/search_engines/default_search_manager.h"
-#include "components/search_engines/search_engines_pref_names.h"
-#include "components/search_engines/template_url_data.h"
-#include "components/search_engines/template_url_service.h"
-#include "url/gurl.h"
-
-namespace {
-
-// Loads the user-selected DSE (if there is one) from legacy preferences.
-std::unique_ptr<TemplateURLData> LoadDefaultSearchProviderFromLegacyPrefs(
-    PrefService* prefs) {
-  if (!prefs->HasPrefPath(prefs::kDefaultSearchProviderSearchURL) ||
-      !prefs->HasPrefPath(prefs::kDefaultSearchProviderKeyword))
-    return std::unique_ptr<TemplateURLData>();
-
-  const PrefService::Preference* pref =
-      prefs->FindPreference(prefs::kDefaultSearchProviderSearchURL);
-  DCHECK(pref);
-  if (pref->IsManaged())
-    return std::unique_ptr<TemplateURLData>();
-
-  base::string16 keyword =
-      base::UTF8ToUTF16(prefs->GetString(prefs::kDefaultSearchProviderKeyword));
-  std::string search_url =
-      prefs->GetString(prefs::kDefaultSearchProviderSearchURL);
-  if (keyword.empty() || search_url.empty())
-    return std::unique_ptr<TemplateURLData>();
-
-  std::unique_ptr<TemplateURLData> default_provider_data(new TemplateURLData);
-  default_provider_data->SetShortName(
-      base::UTF8ToUTF16(prefs->GetString(prefs::kDefaultSearchProviderName)));
-  default_provider_data->SetKeyword(keyword);
-  default_provider_data->SetURL(search_url);
-  default_provider_data->suggestions_url =
-      prefs->GetString(prefs::kDefaultSearchProviderSuggestURL);
-  default_provider_data->instant_url =
-      prefs->GetString(prefs::kDefaultSearchProviderInstantURL);
-  default_provider_data->image_url =
-      prefs->GetString(prefs::kDefaultSearchProviderImageURL);
-  default_provider_data->new_tab_url =
-      prefs->GetString(prefs::kDefaultSearchProviderNewTabURL);
-  default_provider_data->search_url_post_params =
-      prefs->GetString(prefs::kDefaultSearchProviderSearchURLPostParams);
-  default_provider_data->suggestions_url_post_params =
-      prefs->GetString(prefs::kDefaultSearchProviderSuggestURLPostParams);
-  default_provider_data->instant_url_post_params =
-      prefs->GetString(prefs::kDefaultSearchProviderInstantURLPostParams);
-  default_provider_data->image_url_post_params =
-      prefs->GetString(prefs::kDefaultSearchProviderImageURLPostParams);
-  default_provider_data->favicon_url =
-      GURL(prefs->GetString(prefs::kDefaultSearchProviderIconURL));
-  default_provider_data->search_terms_replacement_key =
-      prefs->GetString(prefs::kDefaultSearchProviderSearchTermsReplacementKey);
-  default_provider_data->input_encodings = base::SplitString(
-      prefs->GetString(prefs::kDefaultSearchProviderEncodings),
-      ";", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
-
-  default_provider_data->alternate_urls.clear();
-  const base::ListValue* alternate_urls =
-      prefs->GetList(prefs::kDefaultSearchProviderAlternateURLs);
-  for (size_t i = 0; i < alternate_urls->GetSize(); ++i) {
-    std::string alternate_url;
-    if (alternate_urls->GetString(i, &alternate_url))
-      default_provider_data->alternate_urls.push_back(alternate_url);
-  }
-
-  std::string id_string = prefs->GetString(prefs::kDefaultSearchProviderID);
-  if (!id_string.empty()) {
-    int64_t value;
-    base::StringToInt64(id_string, &value);
-    default_provider_data->id = value;
-  }
-
-  std::string prepopulate_id =
-      prefs->GetString(prefs::kDefaultSearchProviderPrepopulateID);
-  if (!prepopulate_id.empty()) {
-    int value;
-    base::StringToInt(prepopulate_id, &value);
-    default_provider_data->prepopulate_id = value;
-  }
-
-  return default_provider_data;
-}
-
-void ClearDefaultSearchProviderFromLegacyPrefs(PrefService* prefs) {
-  prefs->ClearPref(prefs::kDefaultSearchProviderName);
-  prefs->ClearPref(prefs::kDefaultSearchProviderKeyword);
-  prefs->ClearPref(prefs::kDefaultSearchProviderSearchURL);
-  prefs->ClearPref(prefs::kDefaultSearchProviderSuggestURL);
-  prefs->ClearPref(prefs::kDefaultSearchProviderInstantURL);
-  prefs->ClearPref(prefs::kDefaultSearchProviderImageURL);
-  prefs->ClearPref(prefs::kDefaultSearchProviderNewTabURL);
-  prefs->ClearPref(prefs::kDefaultSearchProviderSearchURLPostParams);
-  prefs->ClearPref(prefs::kDefaultSearchProviderSuggestURLPostParams);
-  prefs->ClearPref(prefs::kDefaultSearchProviderInstantURLPostParams);
-  prefs->ClearPref(prefs::kDefaultSearchProviderImageURLPostParams);
-  prefs->ClearPref(prefs::kDefaultSearchProviderIconURL);
-  prefs->ClearPref(prefs::kDefaultSearchProviderEncodings);
-  prefs->ClearPref(prefs::kDefaultSearchProviderPrepopulateID);
-  prefs->ClearPref(prefs::kDefaultSearchProviderAlternateURLs);
-  prefs->ClearPref(prefs::kDefaultSearchProviderSearchTermsReplacementKey);
-}
-
-void MigrateDefaultSearchPref(PrefService* pref_service) {
-  DCHECK(pref_service);
-
-  std::unique_ptr<TemplateURLData> legacy_dse_from_prefs =
-      LoadDefaultSearchProviderFromLegacyPrefs(pref_service);
-  if (!legacy_dse_from_prefs)
-    return;
-
-  DefaultSearchManager default_search_manager(
-      pref_service, DefaultSearchManager::ObserverCallback());
-  DefaultSearchManager::Source modern_source;
-  TemplateURLData* modern_value =
-      default_search_manager.GetDefaultSearchEngine(&modern_source);
-  if (modern_source == DefaultSearchManager::FROM_FALLBACK) {
-    // |modern_value| is the prepopulated default. If it matches the legacy DSE
-    // we assume it is not a user-selected value.
-    if (!modern_value ||
-        legacy_dse_from_prefs->prepopulate_id != modern_value->prepopulate_id) {
-      // This looks like a user-selected value, so let's migrate it.
-      // TODO(erikwright): Remove this migration logic when this stat approaches
-      // zero.
-      UMA_HISTOGRAM_BOOLEAN("Search.MigratedPrefToDictionaryValue", true);
-      default_search_manager.SetUserSelectedDefaultSearchEngine(
-          *legacy_dse_from_prefs);
-    }
-  }
-
-  ClearDefaultSearchProviderFromLegacyPrefs(pref_service);
-}
-
-void OnPrefsInitialized(PrefService* pref_service,
-                        bool pref_service_initialization_success) {
-  MigrateDefaultSearchPref(pref_service);
-}
-
-}  // namespace
-
-void ConfigureDefaultSearchPrefMigrationToDictionaryValue(
-    PrefService* pref_service) {
-  if (pref_service->GetInitializationStatus() ==
-      PrefService::INITIALIZATION_STATUS_WAITING) {
-    pref_service->AddPrefInitObserver(
-        base::Bind(&OnPrefsInitialized, base::Unretained(pref_service)));
-  } else {
-    MigrateDefaultSearchPref(pref_service);
-  }
-}