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// Copyright 2013 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_language_list.h"
#include <set>
#include "base/json/json_reader.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/translate/translate_event_details.h"
#include "chrome/browser/translate/translate_manager.h"
#include "chrome/browser/translate/translate_url_util.h"
#include "googleurl/src/gurl.h"
#include "net/base/load_flags.h"
#include "net/base/url_util.h"
#include "net/http/http_status_code.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_status.h"
namespace {
// The default list of languages the Google translation server supports.
// We use this list until we receive the list that the server exposes.
// For information, here is the list of languages that Chrome can be run in
// but that the translation server does not support:
// am Amharic
// bn Bengali
// gu Gujarati
// kn Kannada
// ml Malayalam
// mr Marathi
// ta Tamil
// te Telugu
const char* const kDefaultSupportedLanguages[] = {
"af", // Afrikaans
"sq", // Albanian
"ar", // Arabic
"be", // Belarusian
"bg", // Bulgarian
"ca", // Catalan
"zh-CN", // Chinese (Simplified)
"zh-TW", // Chinese (Traditional)
"hr", // Croatian
"cs", // Czech
"da", // Danish
"nl", // Dutch
"en", // English
"eo", // Esperanto
"et", // Estonian
"tl", // Filipino
"fi", // Finnish
"fr", // French
"gl", // Galician
"de", // German
"el", // Greek
"ht", // Haitian Creole
"iw", // Hebrew
"hi", // Hindi
"hu", // Hungarian
"is", // Icelandic
"id", // Indonesian
"ga", // Irish
"it", // Italian
"ja", // Japanese
"ko", // Korean
"lv", // Latvian
"lt", // Lithuanian
"mk", // Macedonian
"ms", // Malay
"mt", // Maltese
"no", // Norwegian
"fa", // Persian
"pl", // Polish
"pt", // Portuguese
"ro", // Romanian
"ru", // Russian
"sr", // Serbian
"sk", // Slovak
"sl", // Slovenian
"es", // Spanish
"sw", // Swahili
"sv", // Swedish
"th", // Thai
"tr", // Turkish
"uk", // Ukrainian
"vi", // Vietnamese
"cy", // Welsh
"yi", // Yiddish
};
// Constant URL string to fetch server supporting language list.
const char kLanguageListFetchURL[] =
"https://translate.googleapis.com/translate_a/l?client=chrome&cb=sl";
// Used in kTranslateScriptURL to request supporting languages list including
// "alpha languages".
const char kAlphaLanguageQueryName[] = "alpha";
const char kAlphaLanguageQueryValue[] = "1";
// Retry parameter for fetching supporting language list.
const int kMaxRetryLanguageListFetch = 5;
const int kFetcherIdForLanguageList = 1;
const int kFetcherIdForAlphaLanguageList = 2;
// Show a message in chrome:://translate-internals Event Logs.
void NotifyEvent(int line, const std::string& message) {
TranslateManager* manager = TranslateManager::GetInstance();
DCHECK(manager);
TranslateEventDetails details(__FILE__, line, message);
manager->NotifyTranslateEvent(details);
}
// Parses |language_list| containing the list of languages that the translate
// server can translate to and from, and fills |set| with them.
void SetSupportedLanguages(const std::string& language_list,
std::set<std::string>* set) {
DCHECK(set);
// The format is:
// sl({"sl": {"XX": "LanguageName", ...}, "tl": {"XX": "LanguageName", ...}})
// Where "sl(" is set in kLanguageListCallbackName
// and "tl" is kTargetLanguagesKey
if (!StartsWithASCII(language_list,
TranslateLanguageList::kLanguageListCallbackName,
false) ||
!EndsWith(language_list, ")", false)) {
// We don't have a NOTREACHED here since this can happen in ui_tests, even
// though the the BrowserMain function won't call us with parameters.ui_task
// is NULL some tests don't set it, so we must bail here.
return;
}
static const size_t kLanguageListCallbackNameLength =
strlen(TranslateLanguageList::kLanguageListCallbackName);
std::string languages_json = language_list.substr(
kLanguageListCallbackNameLength,
language_list.size() - kLanguageListCallbackNameLength - 1);
scoped_ptr<Value> json_value(
base::JSONReader::Read(languages_json, base::JSON_ALLOW_TRAILING_COMMAS));
if (json_value == NULL || !json_value->IsType(Value::TYPE_DICTIONARY)) {
NOTREACHED();
return;
}
// The first level dictionary contains two sub-dict, one for source languages
// and the other for target languages, we want to use the target languages.
DictionaryValue* language_dict =
static_cast<DictionaryValue*>(json_value.get());
DictionaryValue* target_languages = NULL;
if (!language_dict->GetDictionary(TranslateLanguageList::kTargetLanguagesKey,
&target_languages) ||
target_languages == NULL) {
NOTREACHED();
return;
}
// Now we can clear language list.
set->clear();
std::string message;
// ... and replace it with the values we just fetched from the server.
for (DictionaryValue::Iterator iter(*target_languages);
!iter.IsAtEnd();
iter.Advance()) {
// TODO(toyoshim): Check if UI libraries support adding locale.
set->insert(iter.key());
if (message.empty())
message += iter.key();
else
message += ", " + iter.key();
}
NotifyEvent(__LINE__, message);
}
// Creates URLFetcher, sets arguments to start, and returns the object.
net::URLFetcher* CreateAndStartFetch(int id,
const GURL& url,
net::URLFetcherDelegate* delegate) {
DCHECK(delegate);
std::string message = base::StringPrintf(
"%s list fetch starts (URL: %s)",
(id == kFetcherIdForLanguageList) ? "Language" : "Alpha language",
url.spec().c_str());
NotifyEvent(__LINE__, message);
scoped_ptr<net::URLFetcher> fetcher;
fetcher.reset(net::URLFetcher::Create(id,
url,
net::URLFetcher::GET,
delegate));
fetcher->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SAVE_COOKIES);
fetcher->SetRequestContext(g_browser_process->system_request_context());
fetcher->SetMaxRetriesOn5xx(kMaxRetryLanguageListFetch);
fetcher->Start();
return fetcher.release();
}
} // namespace
// This must be kept in sync with the &cb= value in the kLanguageListFetchURL.
const char TranslateLanguageList::kLanguageListCallbackName[] = "sl(";
const char TranslateLanguageList::kTargetLanguagesKey[] = "tl";
TranslateLanguageList::TranslateLanguageList() {
// We default to our hard coded list of languages in
// |kDefaultSupportedLanguages|. This list will be overriden by a server
// providing supported langauges list.
for (size_t i = 0; i < arraysize(kDefaultSupportedLanguages); ++i)
supported_languages_.insert(kDefaultSupportedLanguages[i]);
UpdateSupportedLanguages();
}
TranslateLanguageList::~TranslateLanguageList() {}
void TranslateLanguageList::OnURLFetchComplete(const net::URLFetcher* source) {
scoped_ptr<const net::URLFetcher> delete_ptr;
if (source->GetStatus().status() == net::URLRequestStatus::SUCCESS &&
source->GetResponseCode() == net::HTTP_OK) {
std::string data;
source->GetResponseAsString(&data);
if (language_list_fetcher_.get() == source) {
NotifyEvent(__LINE__, "Language list is updated");
delete_ptr.reset(language_list_fetcher_.release());
SetSupportedLanguages(data, &supported_languages_);
} else if (alpha_language_list_fetcher_.get() == source) {
NotifyEvent(__LINE__, "Alpha language list is updated");
delete_ptr.reset(alpha_language_list_fetcher_.release());
SetSupportedLanguages(data, &supported_alpha_languages_);
} else {
NOTREACHED();
}
UpdateSupportedLanguages();
} else {
// TODO(toyoshim): Try again. http://crbug.com/244202 .
// Also In CrOS, FetchLanguageList is not called at launching Chrome. It
// will solve this problem that check if FetchLanguageList is already
// called, and call it if needed in InitSupportedLanguage().
std::string message = base::StringPrintf(
"%s list update fails (Status: %d, URL: %s)",
(language_list_fetcher_.get() == source) ? "Language" :
"Alpha language",
source->GetResponseCode(),
source->GetOriginalURL().spec().c_str());
NotifyEvent(__LINE__, message);
}
}
void TranslateLanguageList::GetSupportedLanguages(
std::vector<std::string>* languages) {
DCHECK(languages && languages->empty());
std::set<std::string>::const_iterator iter = all_supported_languages_.begin();
for (; iter != all_supported_languages_.end(); ++iter)
languages->push_back(*iter);
}
std::string TranslateLanguageList::GetLanguageCode(
const std::string& chrome_locale) {
// Only remove the country code for country specific languages we don't
// support specifically yet.
if (IsSupportedLanguage(chrome_locale))
return chrome_locale;
size_t hypen_index = chrome_locale.find('-');
if (hypen_index == std::string::npos)
return chrome_locale;
return chrome_locale.substr(0, hypen_index);
}
bool TranslateLanguageList::IsSupportedLanguage(const std::string& language) {
return all_supported_languages_.count(language) != 0;
}
bool TranslateLanguageList::IsAlphaLanguage(const std::string& language) {
// |language| should exist only in the alpha language list.
return supported_alpha_languages_.count(language) != 0 &&
supported_languages_.count(language) == 0;
}
void TranslateLanguageList::RequestLanguageList() {
if (language_list_fetcher_.get() || alpha_language_list_fetcher_.get())
return;
// Fetch the stable language list.
GURL language_list_fetch_url = GURL(kLanguageListFetchURL);
language_list_fetch_url =
TranslateURLUtil::AddHostLocaleToUrl(language_list_fetch_url);
language_list_fetch_url =
TranslateURLUtil::AddApiKeyToUrl(language_list_fetch_url);
language_list_fetcher_.reset(
CreateAndStartFetch(kFetcherIdForLanguageList,
language_list_fetch_url,
this));
// Fetch the alpha language list.
language_list_fetch_url = net::AppendQueryParameter(
language_list_fetch_url,
kAlphaLanguageQueryName,
kAlphaLanguageQueryValue);
alpha_language_list_fetcher_.reset(
CreateAndStartFetch(kFetcherIdForAlphaLanguageList,
language_list_fetch_url,
this));
}
void TranslateLanguageList::UpdateSupportedLanguages() {
all_supported_languages_.clear();
std::set<std::string>::const_iterator iter;
for (iter = supported_languages_.begin();
iter != supported_languages_.end();
++iter)
all_supported_languages_.insert(*iter);
for (iter = supported_alpha_languages_.begin();
iter != supported_alpha_languages_.end();
++iter)
all_supported_languages_.insert(*iter);
}
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