Options2: Pull the trigger.

chrome/browser/ui/webui/options2/chromeos/system_settings_provider.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/webui/options2/chromeos/system_settings_provider.h"
+
+#include <string>
+
+#include "base/i18n/rtl.h"
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/stl_util.h"
+#include "base/string_util.h"
+#include "base/stringprintf.h"
+#include "base/synchronization/lock.h"
+#include "base/time.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/browser/chromeos/cros/cros_library.h"
+#include "chrome/browser/chromeos/cros_settings.h"
+#include "chrome/browser/chromeos/cros_settings_names.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
+#include "grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "unicode/calendar.h"
+#include "unicode/timezone.h"
+#include "unicode/ures.h"
+
+namespace {
+
+// TODO(jungshik): Using Enumerate method in ICU gives 600+ timezones.
+// Even after filtering out duplicate entries with a strict identity check,
+// we still have 400+ zones. Relaxing the criteria for the timezone
+// identity is likely to cut down the number to < 100. Until we
+// come up with a better list, we hard-code the following list as used by
+// Android.
+static const char* kTimeZones[] = {
+    "Pacific/Majuro",
+    "Pacific/Midway",
+    "Pacific/Honolulu",
+    "America/Anchorage",
+    "America/Los_Angeles",
+    "America/Tijuana",
+    "America/Denver",
+    "America/Phoenix",
+    "America/Chihuahua",
+    "America/Chicago",
+    "America/Mexico_City",
+    "America/Costa_Rica",
+    "America/Regina",
+    "America/New_York",
+    "America/Bogota",
+    "America/Caracas",
+    "America/Barbados",
+    "America/Manaus",
+    "America/Santiago",
+    "America/St_Johns",
+    "America/Sao_Paulo",
+    "America/Araguaina",
+    "America/Argentina/Buenos_Aires",
+    "America/Godthab",
+    "America/Montevideo",
+    "Atlantic/South_Georgia",
+    "Atlantic/Azores",
+    "Atlantic/Cape_Verde",
+    "Africa/Casablanca",
+    "Europe/London",
+    "Europe/Amsterdam",
+    "Europe/Belgrade",
+    "Europe/Brussels",
+    "Europe/Sarajevo",
+    "Africa/Windhoek",
+    "Africa/Brazzaville",
+    "Asia/Amman",
+    "Europe/Athens",
+    "Asia/Beirut",
+    "Africa/Cairo",
+    "Europe/Helsinki",
+    "Asia/Jerusalem",
+    "Europe/Minsk",
+    "Africa/Harare",
+    "Asia/Baghdad",
+    "Europe/Moscow",
+    "Asia/Kuwait",
+    "Africa/Nairobi",
+    "Asia/Tehran",
+    "Asia/Baku",
+    "Asia/Tbilisi",
+    "Asia/Yerevan",
+    "Asia/Dubai",
+    "Asia/Kabul",
+    "Asia/Karachi",
+    "Asia/Oral",
+    "Asia/Yekaterinburg",
+    "Asia/Calcutta",
+    "Asia/Colombo",
+    "Asia/Katmandu",
+    "Asia/Almaty",
+    "Asia/Rangoon",
+    "Asia/Krasnoyarsk",
+    "Asia/Bangkok",
+    "Asia/Shanghai",
+    "Asia/Hong_Kong",
+    "Asia/Irkutsk",
+    "Asia/Kuala_Lumpur",
+    "Australia/Perth",
+    "Asia/Taipei",
+    "Asia/Seoul",
+    "Asia/Tokyo",
+    "Asia/Yakutsk",
+    "Australia/Adelaide",
+    "Australia/Darwin",
+    "Australia/Brisbane",
+    "Australia/Hobart",
+    "Australia/Sydney",
+    "Asia/Vladivostok",
+    "Pacific/Guam",
+    "Asia/Magadan",
+    "Pacific/Auckland",
+    "Pacific/Fiji",
+    "Pacific/Tongatapu",
+};
+
+static base::LazyInstance<base::Lock,
+                          base::LeakyLazyInstanceTraits<base::Lock> >
+    g_timezone_bundle_lock = LAZY_INSTANCE_INITIALIZER;
+
+struct UResClose {
+  inline void operator() (UResourceBundle* b) const {
+    ures_close(b);
+  }
+};
+
+string16 GetExemplarCity(const icu::TimeZone& zone) {
+  // TODO(jungshik): After upgrading to ICU 4.6, use U_ICUDATA_ZONE
+  static const char* zone_bundle_name = NULL;
+
+  // These will be leaked at the end.
+  static UResourceBundle *zone_bundle = NULL;
+  static UResourceBundle *zone_strings = NULL;
+
+  UErrorCode status = U_ZERO_ERROR;
+  {
+    base::AutoLock lock(g_timezone_bundle_lock.Get());
+    if (zone_bundle == NULL)
+      zone_bundle = ures_open(zone_bundle_name, uloc_getDefault(), &status);
+
+    if (zone_strings == NULL)
+      zone_strings = ures_getByKey(zone_bundle, "zone_strings", NULL, &status);
+  }
+
+  icu::UnicodeString zone_id;
+  zone.getID(zone_id);
+  std::string zone_id_str;
+  zone_id.toUTF8String(zone_id_str);
+
+  // resource keys for timezones use ':' in place of '/'.
+  ReplaceSubstringsAfterOffset(&zone_id_str, 0, "/", ":");
+  scoped_ptr_malloc<UResourceBundle, UResClose> zone_item(
+      ures_getByKey(zone_strings, zone_id_str.c_str(), NULL, &status));
+  icu::UnicodeString city;
+  if (!U_FAILURE(status)) {
+    city = icu::ures_getUnicodeStringByKey(zone_item.get(), "ec", &status);
+    if (U_SUCCESS(status))
+      return string16(city.getBuffer(), city.length());
+  }
+
+  // Fallback case in case of failure.
+  ReplaceSubstringsAfterOffset(&zone_id_str, 0, ":", "/");
+  // Take the last component of a timezone id (e.g. 'Baz' in 'Foo/Bar/Baz').
+  // Depending on timezones, keeping all but the 1st component
+  // (e.g. Bar/Baz) may be better, but our current list does not have
+  // any timezone for which that's the case.
+  std::string::size_type slash_pos = zone_id_str.rfind('/');
+  if (slash_pos != std::string::npos && slash_pos < zone_id_str.size())
+    zone_id_str.erase(0, slash_pos + 1);
+  // zone id has '_' in place of ' '.
+  ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
+  return ASCIIToUTF16(zone_id_str);
+}
+
+}  // namespace anonymous
+
+namespace chromeos {
+
+SystemSettingsProvider::SystemSettingsProvider(
+    const NotifyObserversCallback& notify_cb)
+    : CrosSettingsProvider(notify_cb) {
+  for (size_t i = 0; i < arraysize(kTimeZones); i++) {
+    timezones_.push_back(icu::TimeZone::createTimeZone(
+        icu::UnicodeString(kTimeZones[i], -1, US_INV)));
+  }
+  system::TimezoneSettings::GetInstance()->AddObserver(this);
+  timezone_value_.reset(base::Value::CreateStringValue(GetKnownTimezoneID(
+      system::TimezoneSettings::GetInstance()->GetTimezone())));
+}
+
+SystemSettingsProvider::~SystemSettingsProvider() {
+  system::TimezoneSettings::GetInstance()->RemoveObserver(this);
+  STLDeleteElements(&timezones_);
+}
+
+void SystemSettingsProvider::DoSet(const std::string& path,
+                                   const base::Value& in_value) {
+  // Non-guest users can change the time zone.
+  if (UserManager::Get()->IsLoggedInAsGuest())
+    return;
+
+  if (path == kSystemTimezone) {
+    string16 value;
+    if (!in_value.IsType(Value::TYPE_STRING) || !in_value.GetAsString(&value))
+      return;
+    const icu::TimeZone* timezone = GetTimezone(value);
+    if (!timezone)
+      return;
+    system::TimezoneSettings::GetInstance()->SetTimezone(*timezone);
+    timezone_value_.reset(
+        base::Value::CreateStringValue(GetKnownTimezoneID(*timezone)));
+  }
+}
+
+const base::Value* SystemSettingsProvider::Get(const std::string& path) const {
+  if (path == kSystemTimezone)
+    return timezone_value_.get();
+  return NULL;
+}
+
+// The timezone is always trusted.
+bool SystemSettingsProvider::GetTrusted(const std::string& path,
+                                        const base::Closure& callback) {
+  return true;
+}
+
+bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
+  return path == kSystemTimezone;
+}
+
+void SystemSettingsProvider::Reload() {
+  // TODO(pastarmovj): We can actually cache the timezone here to make returning
+  // it faster.
+}
+
+void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
+  // Fires system setting change notification.
+  timezone_value_.reset(
+      base::Value::CreateStringValue(GetKnownTimezoneID(timezone)));
+  NotifyObservers(kSystemTimezone);
+}
+
+ListValue* SystemSettingsProvider::GetTimezoneList() {
+  ListValue* timezoneList = new ListValue();
+  for (std::vector<icu::TimeZone*>::iterator iter = timezones_.begin();
+       iter != timezones_.end(); ++iter) {
+    const icu::TimeZone* timezone = *iter;
+    ListValue* option = new ListValue();
+    option->Append(Value::CreateStringValue(GetTimezoneID(*timezone)));
+    option->Append(Value::CreateStringValue(GetTimezoneName(*timezone)));
+    timezoneList->Append(option);
+  }
+  return timezoneList;
+}
+
+string16 SystemSettingsProvider::GetTimezoneName(
+    const icu::TimeZone& timezone) {
+  // Instead of using the raw_offset, use the offset in effect now.
+  // For instance, US Pacific Time, the offset shown will be -7 in summer
+  // while it'll be -8 in winter.
+  int raw_offset, dst_offset;
+  UDate now = icu::Calendar::getNow();
+  UErrorCode status = U_ZERO_ERROR;
+  timezone.getOffset(now, false, raw_offset, dst_offset, status);
+  DCHECK(U_SUCCESS(status));
+  int offset = raw_offset + dst_offset;
+  // offset is in msec.
+  int minute_offset = std::abs(offset) / 60000;
+  int hour_offset = minute_offset / 60;
+  int min_remainder = minute_offset % 60;
+  // Some timezones have a non-integral hour offset. So, we need to
+  // use hh:mm form.
+  std::string  offset_str = base::StringPrintf(offset >= 0 ?
+      "UTC+%d:%02d" : "UTC-%d:%02d", hour_offset, min_remainder);
+
+  // TODO(jungshik): When coming up with a better list of timezones, we also
+  // have to come up with better 'display' names. One possibility is to list
+  // multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
+  // the population of a country the city belongs to.).
+  // We can also think of using LONG_GENERIC or LOCATION once we upgrade
+  // to ICU 4.6.
+  // In the meantime, we use "LONG" name with "Exemplar City" to distinguish
+  // multiple timezones with the same "LONG" name but with different
+  // rules (e.g. US Mountain Time in Denver vs Phoenix).
+  icu::UnicodeString name;
+  timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
+  string16 result(l10n_util::GetStringFUTF16(
+      IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE, ASCIIToUTF16(offset_str),
+      string16(name.getBuffer(), name.length()), GetExemplarCity(timezone)));
+  base::i18n::AdjustStringForLocaleDirection(&result);
+  return result;
+}
+
+string16 SystemSettingsProvider::GetTimezoneID(
+    const icu::TimeZone& timezone) {
+  icu::UnicodeString id;
+  timezone.getID(id);
+  return string16(id.getBuffer(), id.length());
+}
+
+const icu::TimeZone* SystemSettingsProvider::GetTimezone(
+    const string16& timezone_id) {
+  for (std::vector<icu::TimeZone*>::iterator iter = timezones_.begin();
+       iter != timezones_.end(); ++iter) {
+    const icu::TimeZone* timezone = *iter;
+    if (GetTimezoneID(*timezone) == timezone_id) {
+      return timezone;
+    }
+  }
+  return NULL;
+}
+
+string16 SystemSettingsProvider::GetKnownTimezoneID(
+    const icu::TimeZone& timezone) const {
+  for (std::vector<icu::TimeZone*>::const_iterator iter = timezones_.begin();
+       iter != timezones_.end(); ++iter) {
+    const icu::TimeZone* known_timezone = *iter;
+    if (known_timezone->hasSameRules(timezone))
+      return GetTimezoneID(*known_timezone);
+  }
+
+  // Not able to find a matching timezone in our list.
+  return string16();
+}
+
+}  // namespace chromeos