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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/locale/locale_change_guard.h"
#include <algorithm>
#include <string_view>
#include "base/containers/contains.h"
#include "base/containers/fixed_flat_set.h"
#include "base/functional/bind.h"
#include "base/metrics/user_metrics.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/app/chrome_command_ids.h"
#include "chrome/browser/ash/base/locale_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/pref_names.h"
#include "components/language/core/browser/pref_names.h"
#include "components/language/core/common/locale_util.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/web_contents.h"
#include "ui/base/l10n/l10n_util.h"
namespace ash {
namespace {
using ::base::UserMetricsAction;
using ::content::WebContents;
// These are the languages that do not require user notification when locale is
// switched automatically between regions within the same language.
//
// New language in kAcceptLanguageList should be added either here or to
// to the exception list in unit test.
constexpr auto kSkipShowNotificationLanguages =
base::MakeFixedFlatSet<std::string_view>({"en", "de", "fr", "it"});
} // anonymous namespace
LocaleChangeGuard::LocaleChangeGuard(Profile* profile, PrefService* local_state)
: profile_(profile), local_state_(local_state) {
DCHECK(profile_);
DeviceSettingsService::Get()->AddObserver(this);
}
LocaleChangeGuard::~LocaleChangeGuard() {
if (DeviceSettingsService::IsInitialized())
DeviceSettingsService::Get()->RemoveObserver(this);
}
void LocaleChangeGuard::OnLogin() {
if (session_manager::SessionManager::Get()->IsSessionStarted()) {
Check();
} else {
if (session_observation_.IsObserving()) {
DCHECK(session_observation_.IsObservingSource(
session_manager::SessionManager::Get()));
return;
}
session_observation_.Observe(session_manager::SessionManager::Get());
}
}
void LocaleChangeGuard::RevertLocaleChange() {
if (from_locale_.empty() || to_locale_.empty()) {
NOTREACHED();
}
if (reverted_)
return;
reverted_ = true;
base::RecordAction(UserMetricsAction("LanguageChange_Revert"));
profile_->ChangeAppLocale(from_locale_,
Profile::APP_LOCALE_CHANGED_VIA_REVERT);
chrome::AttemptUserExit();
}
void LocaleChangeGuard::OnUserSessionStarted(bool is_primary_user) {
session_observation_.Reset();
Check();
}
void LocaleChangeGuard::OwnershipStatusChanged() {
if (!DeviceSettingsService::Get()->HasPrivateOwnerKey()) {
return;
}
if (!local_state_) {
return;
}
PrefService* prefs = profile_->GetPrefs();
DCHECK(prefs);
std::string owner_locale =
prefs->GetString(language::prefs::kApplicationLocale);
language::ConvertToActualUILocale(&owner_locale);
if (!owner_locale.empty()) {
local_state_->SetString(prefs::kOwnerLocale, owner_locale);
}
}
void LocaleChangeGuard::Check() {
std::string cur_locale = g_browser_process->GetApplicationLocale();
if (cur_locale.empty()) {
NOTREACHED();
}
PrefService* prefs = profile_->GetPrefs();
if (prefs == nullptr) {
NOTREACHED();
}
std::string to_locale = prefs->GetString(language::prefs::kApplicationLocale);
// Ensure that synchronization does not change the locale to a value not
// allowed by enterprise policy.
if (!locale_util::IsAllowedUILanguage(to_locale, prefs)) {
prefs->SetString(language::prefs::kApplicationLocale,
locale_util::GetAllowedFallbackUILanguage(prefs));
}
language::ConvertToActualUILocale(&to_locale);
if (to_locale != cur_locale && locale_changed_during_login_) {
LocaleUpdateController::Get()->OnLocaleChanged();
return;
}
std::string from_locale = prefs->GetString(prefs::kApplicationLocaleBackup);
if (!RequiresUserConfirmation(from_locale, to_locale)) {
// If the locale changed during login (e.g. from the owner's locale), just
// notify ash about the change, so system UI gets updated.
// If the change also requires user confirmation, the UI will be updates as
// part of `LocaleUpdateController::ConfirmLocaleChange`.
if (locale_changed_during_login_)
LocaleUpdateController::Get()->OnLocaleChanged();
return;
}
// Showing notification.
if (from_locale_ != from_locale || to_locale_ != to_locale) {
// Falling back to showing message in current locale.
LOG(ERROR) << "Showing locale change notification in current (not "
"previous) language";
PrepareChangingLocale(from_locale, to_locale);
}
LocaleUpdateController::Get()->ConfirmLocaleChange(
cur_locale, from_locale_, to_locale_,
base::BindOnce(&LocaleChangeGuard::OnResult,
weak_ptr_factory_.GetWeakPtr()));
}
void LocaleChangeGuard::OnResult(LocaleNotificationResult result) {
switch (result) {
case LocaleNotificationResult::kAccept:
AcceptLocaleChange();
break;
case LocaleNotificationResult::kRevert:
RevertLocaleChange();
break;
}
}
void LocaleChangeGuard::AcceptLocaleChange() {
if (from_locale_.empty() || to_locale_.empty()) {
NOTREACHED();
}
// Check whether locale has been reverted or changed.
// If not: mark current locale as accepted.
if (reverted_)
return;
PrefService* prefs = profile_->GetPrefs();
if (prefs == nullptr) {
NOTREACHED();
}
if (prefs->GetString(language::prefs::kApplicationLocale) != to_locale_)
return;
base::RecordAction(UserMetricsAction("LanguageChange_Accept"));
prefs->SetString(prefs::kApplicationLocaleBackup, to_locale_);
prefs->SetString(prefs::kApplicationLocaleAccepted, to_locale_);
}
void LocaleChangeGuard::PrepareChangingLocale(std::string_view from_locale,
std::string_view to_locale) {
std::string cur_locale = g_browser_process->GetApplicationLocale();
if (!from_locale.empty())
from_locale_ = std::string(from_locale);
if (!to_locale.empty())
to_locale_ = std::string(to_locale);
}
bool LocaleChangeGuard::RequiresUserConfirmation(
std::string_view from_locale,
std::string_view to_locale) const {
// No locale change was detected for the user.
if (from_locale.empty() || from_locale == to_locale)
return false;
// The target locale is already accepted.
if (profile_->GetPrefs()->GetString(prefs::kApplicationLocaleAccepted) ==
to_locale) {
return false;
}
return ShouldShowLocaleChangeNotification(from_locale, to_locale);
}
// static
bool LocaleChangeGuard::ShouldShowLocaleChangeNotification(
std::string_view from_locale,
std::string_view to_locale) {
const std::string_view from_lang = l10n_util::GetLanguage(from_locale);
const std::string_view to_lang = l10n_util::GetLanguage(to_locale);
if (from_locale == to_locale)
return false;
if (from_lang != to_lang)
return true;
return !base::Contains(kSkipShowNotificationLanguages, from_lang);
}
// static
base::span<const std::string_view>
LocaleChangeGuard::GetSkipShowNotificationLanguagesForTesting() {
return kSkipShowNotificationLanguages;
}
} // namespace ash
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