chrome/browser/extensions/api/i18n/i18n_api.cc

   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
  19 namespace GetAcceptLanguages = extensions::api::i18n::GetAcceptLanguages;
  20
  21 namespace extensions {
  22
  23 namespace {
  24
  25 // Errors.
  26 static const char kEmptyAcceptLanguagesError[] = "accept-languages is empty.";
  27
  28 }
  29
  30 bool I18nGetAcceptLanguagesFunction::RunSync() {
  31   std::string accept_languages =
  32       GetProfile()->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 = base::SplitString(
  49       accept_languages, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
  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