chrome/browser/chromeos/system/timezone_util.cc

   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.
   4
   5 #include "chrome/browser/chromeos/system/timezone_util.h"
   6
   7 #include <string>
   8
   9 #include "base/i18n/rtl.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/strings/string_util.h"
  13 #include "base/strings/stringprintf.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "base/synchronization/lock.h"
  16 #include "base/values.h"
  17 #include "chrome/browser/browser_process.h"
  18 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
  19 #include "chrome/browser/chromeos/profiles/profile_helper.h"
  20 #include "chrome/browser/chromeos/settings/cros_settings.h"
  21 #include "chrome/common/pref_names.h"
  22 #include "chrome/grit/generated_resources.h"
  23 #include "chromeos/settings/timezone_settings.h"
  24 #include "chromeos/timezone/timezone_request.h"
  25 #include "components/user_manager/user_manager.h"
  26 #include "third_party/icu/source/common/unicode/ures.h"
  27 #include "third_party/icu/source/common/unicode/utypes.h"
  28 #include "third_party/icu/source/i18n/unicode/calendar.h"
  29 #include "third_party/icu/source/i18n/unicode/timezone.h"
  30 #include "ui/base/l10n/l10n_util.h"
  31
  32 namespace {
  33
  34 struct UResClose {
  35   inline void operator() (UResourceBundle* b) const {
  36     ures_close(b);
  37   }
  38 };
  39
  40 static base::LazyInstance<base::Lock>::Leaky
  41     g_timezone_bundle_lock = LAZY_INSTANCE_INITIALIZER;
  42
  43 // Returns an exemplary city in the given timezone.
  44 base::string16 GetExemplarCity(const icu::TimeZone& zone) {
  45   // TODO(jungshik): After upgrading to ICU 4.6, use U_ICUDATA_ZONE
  46   static const char* zone_bundle_name = NULL;
  47
  48   // These will be leaked at the end.
  49   static UResourceBundle *zone_bundle = NULL;
  50   static UResourceBundle *zone_strings = NULL;
  51
  52   UErrorCode status = U_ZERO_ERROR;
  53   {
  54     base::AutoLock lock(g_timezone_bundle_lock.Get());
  55     if (zone_bundle == NULL)
  56       zone_bundle = ures_open(zone_bundle_name, uloc_getDefault(), &status);
  57
  58     if (zone_strings == NULL)
  59       zone_strings = ures_getByKey(zone_bundle, "zone_strings", NULL, &status);
  60   }
  61
  62   icu::UnicodeString zone_id;
  63   zone.getID(zone_id);
  64   std::string zone_id_str;
  65   zone_id.toUTF8String(zone_id_str);
  66
  67   // Resource keys for timezones use ':' in place of '/'.
  68   base::ReplaceSubstringsAfterOffset(&zone_id_str, 0, "/", ":");
  69   scoped_ptr<UResourceBundle, UResClose> zone_item(
  70       ures_getByKey(zone_strings, zone_id_str.c_str(), NULL, &status));
  71   icu::UnicodeString city;
  72   if (!U_FAILURE(status)) {
  73     city = icu::ures_getUnicodeStringByKey(zone_item.get(), "ec", &status);
  74     if (U_SUCCESS(status))
  75       return base::string16(city.getBuffer(), city.length());
  76   }
  77
  78   // Fallback case in case of failure.
  79   base::ReplaceSubstringsAfterOffset(&zone_id_str, 0, ":", "/");
  80   // Take the last component of a timezone id (e.g. 'Baz' in 'Foo/Bar/Baz').
  81   // Depending on timezones, keeping all but the 1st component
  82   // (e.g. Bar/Baz) may be better, but our current list does not have
  83   // any timezone for which that's the case.
  84   std::string::size_type slash_pos = zone_id_str.rfind('/');
  85   if (slash_pos != std::string::npos && slash_pos < zone_id_str.size())
  86     zone_id_str.erase(0, slash_pos + 1);
  87   // zone id has '_' in place of ' '.
  88   base::ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
  89   return base::ASCIIToUTF16(zone_id_str);
  90 }
  91
  92 // Gets the given timezone's name for visualization.
  93 base::string16 GetTimezoneName(const icu::TimeZone& timezone) {
  94   // Instead of using the raw_offset, use the offset in effect now.
  95   // For instance, US Pacific Time, the offset shown will be -7 in summer
  96   // while it'll be -8 in winter.
  97   int raw_offset, dst_offset;
  98   UDate now = icu::Calendar::getNow();
  99   UErrorCode status = U_ZERO_ERROR;
 100   timezone.getOffset(now, false, raw_offset, dst_offset, status);
 101   DCHECK(U_SUCCESS(status));
 102   int offset = raw_offset + dst_offset;
 103   // |offset| is in msec.
 104   int minute_offset = std::abs(offset) / 60000;
 105   int hour_offset = minute_offset / 60;
 106   int min_remainder = minute_offset % 60;
 107   // Some timezones have a non-integral hour offset. So, we need to use hh:mm
 108   // form.
 109   std::string  offset_str = base::StringPrintf(offset >= 0 ?
 110       "UTC+%d:%02d" : "UTC-%d:%02d", hour_offset, min_remainder);
 111
 112   // TODO(jungshik): When coming up with a better list of timezones, we also
 113   // have to come up with better 'display' names. One possibility is to list
 114   // multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
 115   // the population of a country the city belongs to.).
 116   // We can also think of using LONG_GENERIC or LOCATION once we upgrade
 117   // to ICU 4.6.
 118   // In the meantime, we use "LONG" name with "Exemplar City" to distinguish
 119   // multiple timezones with the same "LONG" name but with different
 120   // rules (e.g. US Mountain Time in Denver vs Phoenix).
 121   icu::UnicodeString name;
 122   timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
 123   base::string16 result(l10n_util::GetStringFUTF16(
 124       IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE,
 125       base::ASCIIToUTF16(offset_str),
 126       base::string16(name.getBuffer(), name.length()),
 127       GetExemplarCity(timezone)));
 128   base::i18n::AdjustStringForLocaleDirection(&result);
 129   return result;
 130 }
 131
 132 }  // namespace
 133
 134 namespace chromeos {
 135 namespace system {
 136
 137 // Creates a list of pairs of each timezone's ID and name.
 138 scoped_ptr<base::ListValue> GetTimezoneList() {
 139   const std::vector<icu::TimeZone*> &timezones =
 140       chromeos::system::TimezoneSettings::GetInstance()->GetTimezoneList();
 141   scoped_ptr<base::ListValue> timezoneList(new base::ListValue());
 142   for (std::vector<icu::TimeZone*>::const_iterator iter = timezones.begin();
 143        iter != timezones.end(); ++iter) {
 144     const icu::TimeZone* timezone = *iter;
 145     base::ListValue* option = new base::ListValue();
 146     option->Append(new base::StringValue(
 147         chromeos::system::TimezoneSettings::GetTimezoneID(*timezone)));
 148     option->Append(new base::StringValue(GetTimezoneName(*timezone)));
 149     timezoneList->Append(option);
 150   }
 151   return timezoneList.Pass();
 152 }
 153
 154 bool HasSystemTimezonePolicy() {
 155   policy::BrowserPolicyConnectorChromeOS* connector =
 156       g_browser_process->platform_part()->browser_policy_connector_chromeos();
 157   if (!connector->IsEnterpriseManaged())
 158     return false;
 159
 160   std::string policy_timezone;
 161   if (chromeos::CrosSettings::Get()->GetString(chromeos::kSystemTimezonePolicy,
 162                                                &policy_timezone) &&
 163       !policy_timezone.empty()) {
 164     VLOG(1) << "Refresh TimeZone: TimeZone settings are overridden"
 165             << " by DevicePolicy.";
 166     return true;
 167   }
 168   return false;
 169 }
 170
 171 void ApplyTimeZone(const TimeZoneResponseData* timezone) {
 172   if (HasSystemTimezonePolicy())
 173     return;
 174
 175   const user_manager::User* primary_user =
 176       user_manager::UserManager::Get()->GetPrimaryUser();
 177   if (primary_user) {
 178     if (!primary_user->is_profile_created())
 179       return;
 180
 181     Profile* profile =
 182         chromeos::ProfileHelper::Get()->GetProfileByUser(primary_user);
 183     if (!profile->GetPrefs()->GetBoolean(
 184             prefs::kResolveTimezoneByGeolocation)) {
 185       return;
 186     }
 187   }
 188
 189   if (!timezone->timeZoneId.empty()) {
 190     VLOG(1) << "Refresh TimeZone: setting timezone to '" << timezone->timeZoneId
 191             << "'";
 192
 193     chromeos::system::TimezoneSettings::GetInstance()->SetTimezoneFromID(
 194         base::UTF8ToUTF16(timezone->timeZoneId));
 195   }
 196 }
 197
 198 }  // namespace system
 199 }  // namespace chromeos