1// Copyright (c) 2012 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.
4
5#include "chrome/browser/extensions/api/i18n/i18n_api.h"
6
7#include <algorithm>
8#include <string>
9#include <vector>
10
11#include "base/lazy_instance.h"
12#include "base/prefs/pref_service.h"
13#include "base/strings/string_piece.h"
14#include "base/strings/string_split.h"
15#include "chrome/browser/profiles/profile.h"
16#include "chrome/common/extensions/api/i18n.h"
17#include "chrome/common/pref_names.h"
18
19namespace GetAcceptLanguages = extensions::api::i18n::GetAcceptLanguages;
20
21namespace extensions {
22
23namespace {
24
25// Errors.
26static const char kEmptyAcceptLanguagesError[] = "accept-languages is empty.";
27
28}
29
30bool I18nGetAcceptLanguagesFunction::RunImpl() {
31  std::string accept_languages =
32      profile()->GetPrefs()->GetString(prefs::kAcceptLanguages);
33  // Currently, there are 2 ways to set browser's accept-languages: through UI
34  // or directly modify the preference file. The accept-languages set through
35  // UI is guranteed to be valid, and the accept-languages string returned from
36  // profile()->GetPrefs()->GetString(prefs::kAcceptLanguages) is guranteed to
37  // be valid and well-formed, which means each accept-langauge is a valid
38  // code, and accept-languages are seperatd by "," without surrrounding
39  // spaces. But we do not do any validation (either the format or the validity
40  // of the language code) on accept-languages set through editing preference
41  // file directly. So, here, we're adding extra checks to be resistant to
42  // crashes caused by data corruption.
43  if (accept_languages.empty()) {
44    error_ = kEmptyAcceptLanguagesError;
45    return false;
46  }
47
48  std::vector<std::string> languages;
49  base::SplitString(accept_languages, ',', &languages);
50  languages.erase(std::remove(languages.begin(), languages.end(), ""),
51                  languages.end());
52
53  if (languages.empty()) {
54    error_ = kEmptyAcceptLanguagesError;
55    return false;
56  }
57
58  results_ = GetAcceptLanguages::Results::Create(languages);
59  return true;
60}
61
62}  // namespace extensions
63