1 // Copyright 2013 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.
5 #include "components/translate/core/browser/translate_language_list.h"
10 #include "base/json/json_reader.h"
11 #include "base/lazy_instance.h"
12 #include "base/logging.h"
13 #include "base/strings/string_util.h"
14 #include "base/strings/stringprintf.h"
15 #include "base/values.h"
16 #include "components/translate/core/browser/translate_browser_metrics.h"
17 #include "components/translate/core/browser/translate_download_manager.h"
18 #include "components/translate/core/browser/translate_event_details.h"
19 #include "components/translate/core/browser/translate_url_fetcher.h"
20 #include "components/translate/core/browser/translate_url_util.h"
21 #include "net/base/url_util.h"
22 #include "ui/base/l10n/l10n_util.h"
27 // The default list of languages the Google translation server supports.
28 // We use this list until we receive the list that the server exposes.
29 // For information, here is the list of languages that Chrome can be run in
30 // but that the translation server does not support:
39 const char* const kDefaultSupportedLanguages[] = {
46 "zh-CN", // Chinese (Simplified)
47 "zh-TW", // Chinese (Traditional)
61 "ht", // Haitian Creole
96 // Constant URL string to fetch server supporting language list.
97 const char kLanguageListFetchURL[] =
98 "https://translate.googleapis.com/translate_a/l?client=chrome&cb=sl";
100 // Used in kTranslateScriptURL to request supporting languages list including
101 // "alpha languages".
102 const char kAlphaLanguageQueryName[] = "alpha";
103 const char kAlphaLanguageQueryValue[] = "1";
105 // Represent if the language list updater is disabled.
106 bool update_is_disabled = false;
108 // Retry parameter for fetching.
109 const int kMaxRetryOn5xx = 5;
113 // This must be kept in sync with the &cb= value in the kLanguageListFetchURL.
114 const char TranslateLanguageList::kLanguageListCallbackName[] = "sl(";
115 const char TranslateLanguageList::kTargetLanguagesKey[] = "tl";
116 const char TranslateLanguageList::kAlphaLanguagesKey[] = "al";
118 TranslateLanguageList::TranslateLanguageList()
119 : resource_requests_allowed_(false), request_pending_(false) {
120 // We default to our hard coded list of languages in
121 // |kDefaultSupportedLanguages|. This list will be overriden by a server
122 // providing supported langauges list.
123 for (size_t i = 0; i < arraysize(kDefaultSupportedLanguages); ++i)
124 all_supported_languages_.insert(kDefaultSupportedLanguages[i]);
126 if (update_is_disabled)
129 language_list_fetcher_.reset(new TranslateURLFetcher(kFetcherId));
130 language_list_fetcher_->set_max_retry_on_5xx(kMaxRetryOn5xx);
133 TranslateLanguageList::~TranslateLanguageList() {}
135 void TranslateLanguageList::GetSupportedLanguages(
136 std::vector<std::string>* languages) {
137 DCHECK(languages && languages->empty());
138 std::set<std::string>::const_iterator iter = all_supported_languages_.begin();
139 for (; iter != all_supported_languages_.end(); ++iter)
140 languages->push_back(*iter);
142 // Update language lists if they are not updated after Chrome was launched
143 // for later requests.
144 if (!update_is_disabled && language_list_fetcher_.get())
145 RequestLanguageList();
148 std::string TranslateLanguageList::GetLanguageCode(
149 const std::string& language) {
150 // Only remove the country code for country specific languages we don't
151 // support specifically yet.
152 if (IsSupportedLanguage(language))
155 size_t hypen_index = language.find('-');
156 if (hypen_index == std::string::npos)
158 return language.substr(0, hypen_index);
161 bool TranslateLanguageList::IsSupportedLanguage(const std::string& language) {
162 return all_supported_languages_.count(language) != 0;
165 bool TranslateLanguageList::IsAlphaLanguage(const std::string& language) {
166 return alpha_languages_.count(language) != 0;
169 void TranslateLanguageList::RequestLanguageList() {
170 // If resource requests are not allowed, we'll get a callback when they are.
171 if (!resource_requests_allowed_) {
172 request_pending_ = true;
176 request_pending_ = false;
178 if (language_list_fetcher_.get() &&
179 (language_list_fetcher_->state() == TranslateURLFetcher::IDLE ||
180 language_list_fetcher_->state() == TranslateURLFetcher::FAILED)) {
181 GURL url = GURL(kLanguageListFetchURL);
182 url = TranslateURLUtil::AddHostLocaleToUrl(url);
183 url = TranslateURLUtil::AddApiKeyToUrl(url);
184 url = net::AppendQueryParameter(
185 url, kAlphaLanguageQueryName, kAlphaLanguageQueryValue);
187 std::string message = base::StringPrintf(
188 "Language list including alpha languages fetch starts (URL: %s)",
190 NotifyEvent(__LINE__, message);
192 bool result = language_list_fetcher_->Request(
194 base::Bind(&TranslateLanguageList::OnLanguageListFetchComplete,
195 base::Unretained(this)));
197 NotifyEvent(__LINE__, "Request is omitted due to retry limit");
201 void TranslateLanguageList::SetResourceRequestsAllowed(bool allowed) {
202 resource_requests_allowed_ = allowed;
203 if (resource_requests_allowed_ && request_pending_) {
204 RequestLanguageList();
205 DCHECK(!request_pending_);
209 scoped_ptr<TranslateLanguageList::EventCallbackList::Subscription>
210 TranslateLanguageList::RegisterEventCallback(const EventCallback& callback) {
211 return callback_list_.Add(callback);
215 void TranslateLanguageList::DisableUpdate() {
216 update_is_disabled = true;
219 void TranslateLanguageList::OnLanguageListFetchComplete(
222 const std::string& data) {
224 // Since it fails just now, omit to schedule resource requests if
225 // ResourceRequestAllowedNotifier think it's ready. Otherwise, a callback
226 // will be invoked later to request resources again.
227 // The TranslateURLFetcher has a limit for retried requests and aborts
228 // re-try not to invoke OnLanguageListFetchComplete anymore if it's asked to
229 // re-try too many times.
230 NotifyEvent(__LINE__, "Failed to fetch languages");
234 NotifyEvent(__LINE__, "Language list is updated");
236 DCHECK_EQ(kFetcherId, id);
238 SetSupportedLanguages(data);
239 language_list_fetcher_.reset();
241 last_updated_ = base::Time::Now();
244 void TranslateLanguageList::NotifyEvent(int line, const std::string& message) {
245 TranslateEventDetails details(__FILE__, line, message);
246 callback_list_.Notify(details);
249 void TranslateLanguageList::SetSupportedLanguages(
250 const std::string& language_list) {
253 // "sl": {"XX": "LanguageName", ...},
254 // "tl": {"XX": "LanguageName", ...},
255 // "al": {"XX": 1, ...}
257 // Where "sl(" is set in kLanguageListCallbackName, "tl" is
258 // kTargetLanguagesKey and "al" kAlphaLanguagesKey.
259 if (!StartsWithASCII(language_list,
260 TranslateLanguageList::kLanguageListCallbackName,
262 !EndsWith(language_list, ")", false)) {
263 // We don't have a NOTREACHED here since this can happen in ui_tests, even
264 // though the the BrowserMain function won't call us with parameters.ui_task
265 // is NULL some tests don't set it, so we must bail here.
268 static const size_t kLanguageListCallbackNameLength =
269 strlen(TranslateLanguageList::kLanguageListCallbackName);
270 std::string languages_json = language_list.substr(
271 kLanguageListCallbackNameLength,
272 language_list.size() - kLanguageListCallbackNameLength - 1);
273 scoped_ptr<base::Value> json_value(
274 base::JSONReader::Read(languages_json, base::JSON_ALLOW_TRAILING_COMMAS));
275 if (json_value == NULL || !json_value->IsType(base::Value::TYPE_DICTIONARY)) {
279 // The first level dictionary contains three sub-dict, first for source
280 // languages and second for target languages, we want to use the target
281 // languages. The last is for alpha languages.
282 base::DictionaryValue* language_dict =
283 static_cast<base::DictionaryValue*>(json_value.get());
284 base::DictionaryValue* target_languages = NULL;
285 if (!language_dict->GetDictionary(TranslateLanguageList::kTargetLanguagesKey,
286 &target_languages) ||
287 target_languages == NULL) {
292 const std::string& locale =
293 TranslateDownloadManager::GetInstance()->application_locale();
295 // Now we can clear language list.
296 all_supported_languages_.clear();
298 // ... and replace it with the values we just fetched from the server.
299 for (base::DictionaryValue::Iterator iter(*target_languages);
302 const std::string& lang = iter.key();
303 if (!l10n_util::IsLocaleNameTranslated(lang.c_str(), locale)) {
304 TranslateBrowserMetrics::ReportUndisplayableLanguage(lang);
307 all_supported_languages_.insert(lang);
311 message += ", " + lang;
313 NotifyEvent(__LINE__, message);
315 // Get the alpha languages. The "al" parameter could be abandoned.
316 base::DictionaryValue* alpha_languages = NULL;
317 if (!language_dict->GetDictionary(TranslateLanguageList::kAlphaLanguagesKey,
319 alpha_languages == NULL) {
323 // We assume that the alpha languages are included in the above target
324 // languages, and don't use UMA or NotifyEvent.
325 alpha_languages_.clear();
326 for (base::DictionaryValue::Iterator iter(*alpha_languages);
327 !iter.IsAtEnd(); iter.Advance()) {
328 const std::string& lang = iter.key();
329 if (!l10n_util::IsLocaleNameTranslated(lang.c_str(), locale))
331 alpha_languages_.insert(lang);