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// Copyright (c) 2010 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 "chrome/browser/translate/translate_manager.h"
#include "base/string_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/renderer_host/translation_service.h"
#include "chrome/browser/tab_contents/language_state.h"
#include "chrome/browser/tab_contents/navigation_controller.h"
#include "chrome/browser/tab_contents/navigation_entry.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/translate/translate_infobars_delegates.h"
#include "chrome/browser/translate/translate_prefs.h"
#include "chrome/common/notification_details.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/notification_source.h"
#include "chrome/common/notification_type.h"
#include "chrome/common/pref_names.h"
#include "chrome/common/pref_service.h"
// static
bool TranslateManager::test_enabled_ = false;
TranslateManager::~TranslateManager() {
}
void TranslateManager::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
switch (type.value) {
case NotificationType::TAB_LANGUAGE_DETERMINED: {
TabContents* tab = Source<TabContents>(source).ptr();
std::string language = *(Details<std::string>(details).ptr());
// We may get this notifications multiple times. Make sure to translate
// only once.
if (!tab->language_state().translation_pending())
InitiateTranslation(tab, language);
break;
}
case NotificationType::PAGE_TRANSLATED: {
// Only add translate infobar if it doesn't exist; if it already exists,
// it would have received the same notification and acted accordingly.
TabContents* tab = Source<TabContents>(source).ptr();
int i;
for (i = 0; i < tab->infobar_delegate_count(); ++i) {
InfoBarDelegate* info_bar = tab->GetInfoBarDelegateAt(i);
if (info_bar->AsTranslateInfoBarDelegate())
break;
}
if (i == tab->infobar_delegate_count()) {
NavigationEntry* entry = tab->controller().GetActiveEntry();
if (entry) {
std::pair<std::string, std::string>* language_pair =
(Details<std::pair<std::string, std::string> >(details).ptr());
PrefService* prefs = tab->profile()->GetPrefs();
tab->AddInfoBar(new TranslateInfoBarDelegate(tab, prefs,
TranslateInfoBarDelegate::kAfterTranslate, entry->url(),
language_pair->first, language_pair->second));
}
}
break;
}
case NotificationType::PROFILE_DESTROYED: {
Profile* profile = Source<Profile>(source).ptr();
notification_registrar_.Remove(this, NotificationType::PROFILE_DESTROYED,
source);
size_t count = accept_languages_.erase(profile->GetPrefs());
// We should know about this profile since we are listening for
// notifications on it.
DCHECK(count > 0);
profile->GetPrefs()->RemovePrefObserver(prefs::kAcceptLanguages, this);
break;
}
case NotificationType::PREF_CHANGED: {
DCHECK(*Details<std::wstring>(details).ptr() == prefs::kAcceptLanguages);
PrefService* prefs = Source<PrefService>(source).ptr();
InitAcceptLanguages(prefs);
break;
}
default:
NOTREACHED();
}
}
TranslateManager::TranslateManager() {
if (!test_enabled_ && !TranslationService::IsTranslationEnabled())
return;
notification_registrar_.Add(this, NotificationType::TAB_LANGUAGE_DETERMINED,
NotificationService::AllSources());
notification_registrar_.Add(this, NotificationType::PAGE_TRANSLATED,
NotificationService::AllSources());
}
void TranslateManager::InitiateTranslation(TabContents* tab,
const std::string& page_lang) {
PrefService* prefs = tab->profile()->GetPrefs();
NavigationEntry* entry = tab->controller().GetActiveEntry();
if (!entry) {
NOTREACHED();
return;
}
if (!TranslationService::IsSupportedLanguage(page_lang))
return; // Nothing to do, we don't support that language.
std::string ui_lang = TranslationService::GetLanguageCode(
g_browser_process->GetApplicationLocale());
// We don't want to translate:
// - any Chrome specific page (New Tab Page, Download, History... pages).
// - similar languages (ex: en-US to en).
// - any user black-listed URLs or user selected language combination.
// - any language the user configured as accepted languages.
if (entry->url().SchemeIs("chrome") || page_lang == ui_lang ||
!TranslatePrefs::CanTranslate(prefs, page_lang, entry->url()) ||
IsAcceptLanguage(tab, page_lang)) {
return;
}
if (TranslatePrefs::ShouldAutoTranslate(prefs, page_lang, ui_lang)) {
// The user has previously select "always translate" for this language.
tab->TranslatePage(page_lang, ui_lang);
return;
}
std::string auto_translate_to = tab->language_state().AutoTranslateTo();
if (!auto_translate_to.empty()) {
// This page was navigated through a click from a translated page.
tab->TranslatePage(page_lang, auto_translate_to);
return;
}
// Prompts the user if he/she wants the page translated.
tab->AddInfoBar(new TranslateInfoBarDelegate(tab, prefs,
TranslateInfoBarDelegate::kBeforeTranslate, entry->url(),
page_lang, ui_lang));
}
bool TranslateManager::IsAcceptLanguage(TabContents* tab,
const std::string& language) {
PrefService* pref_service = tab->profile()->GetPrefs();
PrefServiceLanguagesMap::const_iterator iter =
accept_languages_.find(pref_service);
if (iter == accept_languages_.end()) {
InitAcceptLanguages(pref_service);
// Listen for this profile going away, in which case we would need to clear
// the accepted languages for the profile.
notification_registrar_.Add(this, NotificationType::PROFILE_DESTROYED,
Source<Profile>(tab->profile()));
// Also start listening for changes in the accept languages.
tab->profile()->GetPrefs()->AddPrefObserver(prefs::kAcceptLanguages, this);
iter = accept_languages_.find(pref_service);
}
return iter->second.count(language) != 0;
}
void TranslateManager::InitAcceptLanguages(PrefService* prefs) {
// We have been asked for this profile, build the languages.
std::wstring accept_langs_str = prefs->GetString(prefs::kAcceptLanguages);
std::vector<std::string> accept_langs_list;
LanguageSet accept_langs_set;
SplitString(WideToASCII(accept_langs_str), ',', &accept_langs_list);
std::vector<std::string>::const_iterator iter;
for (iter = accept_langs_list.begin();
iter != accept_langs_list.end(); ++iter) {
// Get rid of the locale extension if any (ex: en-US -> en), but for Chinese
// for which the CLD reports zh-CN and zh-TW.
std::string accept_lang(*iter);
size_t index = iter->find("-");
if (index != std::string::npos && *iter != "zh-CN" && *iter != "zh-TW")
accept_lang = iter->substr(0, iter->length() - index - 1);
accept_langs_set.insert(accept_lang);
}
accept_languages_[prefs] = accept_langs_set;
}
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