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      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::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