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// Copyright 2024 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/language_packs/language_pack_font_service.h"
#include <string>
#include <string_view>
#include <utility>
#include "ash/constants/ash_features.h"
#include "base/check.h"
#include "base/check_deref.h"
#include "base/containers/flat_set.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string_split.h"
#include "chromeos/ash/components/language_packs/language_pack_manager.h"
#include "components/language/core/browser/pref_names.h"
#include "components/language/core/common/locale_util.h"
#include "content/public/browser/browser_thread.h"
#include "ui/gfx/linux/fontconfig_util.h"
namespace ash::language_packs {
LanguagePackFontService::LanguagePackFontService(PrefService* prefs)
: LanguagePackFontService(prefs, base::BindRepeating(&gfx::AddAppFontDir)) {
}
LanguagePackFontService::LanguagePackFontService(PrefService* prefs,
AddFontDir add_font_dir)
: prefs_(CHECK_DEREF(prefs)), add_font_dir_(std::move(add_font_dir)) {
pref_accept_language_.Init(
language::prefs::kPreferredLanguages, &*prefs_,
base::BindRepeating(&LanguagePackFontService::OnAcceptLanguageChanged,
weak_factory_.GetWeakPtr()));
if (features::kLanguagePacksFontsLoadAfterDownloadDuringLogin.Get()) {
// Install all expected fonts (no-op if already installed) and add them to
// fontconfig.
for (std::string& language_pack : GetLanguagePacksForAcceptLanguage()) {
LanguagePackManager::InstallPack(
kFontsFeatureId, language_pack,
base::BindOnce(&LanguagePackFontService::InstallPackOnInitCallback,
weak_factory_.GetWeakPtr()));
}
} else {
// Add installed fonts to fontconfig.
for (std::string& language_pack : GetLanguagePacksForAcceptLanguage()) {
// The below DLC call may race `InstallFontDlcs` above if the preference
// is updated while DLC state is being returned. In the best case, the
// install wins the race, and we add the font to fontconfig prematurely.
// Otherwise, the "get state" wins the race, and we enqueue another DLC
// installation (which should instantly resolve.)
LanguagePackManager::GetPackState(
kFontsFeatureId, language_pack,
base::BindOnce(&LanguagePackFontService::GetPackStateOnInitCallback,
weak_factory_.GetWeakPtr()));
}
}
}
LanguagePackFontService::~LanguagePackFontService() = default;
base::flat_set<std::string>
LanguagePackFontService::GetLanguagePacksForAcceptLanguage() {
base::flat_set<std::string> language_packs;
for (std::string& locale :
base::SplitString(pref_accept_language_.GetValue(), ",",
base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY)) {
std::string_view language = language::ExtractBaseLanguage(locale);
if (language == "ja") {
language_packs.insert("ja");
}
if (language == "ko") {
language_packs.insert("ko");
}
}
return language_packs;
}
void LanguagePackFontService::OnAcceptLanguageChanged() {
for (std::string& language_pack : GetLanguagePacksForAcceptLanguage()) {
LanguagePackManager::InstallPack(kFontsFeatureId, language_pack,
base::DoNothing());
}
}
void LanguagePackFontService::GetPackStateOnInitCallback(
const PackResult& result) {
if (result.pack_state != PackResult::StatusCode::kInstalled &&
!result.language_code.empty()) {
LanguagePackManager::InstallPack(kFontsFeatureId, result.language_code,
base::DoNothing());
return;
}
AddFontDirFromPackResult(result);
}
void LanguagePackFontService::InstallPackOnInitCallback(
const PackResult& result) {
if (result.pack_state != PackResult::StatusCode::kInstalled) {
return;
}
AddFontDirFromPackResult(result);
}
void LanguagePackFontService::AddFontDirFromPackResult(
const PackResult& result) {
// All fontconfig methods need to be called on the "main" thread.
// As this method is only called from a callback which should be on the "main"
// thread, the following `CHECK` should never fail.
CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
bool add_font_result = add_font_dir_.Run(base::FilePath(result.path));
if (!add_font_result) {
LOG(WARNING) << "Adding font for " << result.language_code << " failed";
}
}
} // namespace ash::language_packs
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