1// Copyright (c) 2011 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/ui/webui/options/chromeos/system_settings_provider.h"
6
7#include <string>
8
9#include "base/i18n/rtl.h"
10#include "base/memory/scoped_ptr.h"
11#include "base/stl_util-inl.h"
12#include "base/string_util.h"
13#include "base/stringprintf.h"
14#include "base/synchronization/lock.h"
15#include "base/time.h"
16#include "base/utf_string_conversions.h"
17#include "base/values.h"
18#include "chrome/browser/chromeos/cros/cros_library.h"
19#include "chrome/browser/chromeos/cros_settings.h"
20#include "chrome/browser/chromeos/cros_settings_names.h"
21#include "chrome/browser/chromeos/login/user_manager.h"
22#include "grit/generated_resources.h"
23#include "ui/base/l10n/l10n_util.h"
24#include "unicode/calendar.h"
25#include "unicode/timezone.h"
26#include "unicode/ures.h"
27
28namespace {
29
30// TODO(jungshik): Using Enumerate method in ICU gives 600+ timezones.
31// Even after filtering out duplicate entries with a strict identity check,
32// we still have 400+ zones. Relaxing the criteria for the timezone
33// identity is likely to cut down the number to < 100. Until we
34// come up with a better list, we hard-code the following list as used by
35// Android.
36static const char* kTimeZones[] = {
37    "Pacific/Majuro",
38    "Pacific/Midway",
39    "Pacific/Honolulu",
40    "America/Anchorage",
41    "America/Los_Angeles",
42    "America/Tijuana",
43    "America/Denver",
44    "America/Phoenix",
45    "America/Chihuahua",
46    "America/Chicago",
47    "America/Mexico_City",
48    "America/Costa_Rica",
49    "America/Regina",
50    "America/New_York",
51    "America/Bogota",
52    "America/Caracas",
53    "America/Barbados",
54    "America/Manaus",
55    "America/Santiago",
56    "America/St_Johns",
57    "America/Sao_Paulo",
58    "America/Araguaina",
59    "America/Argentina/Buenos_Aires",
60    "America/Godthab",
61    "America/Montevideo",
62    "Atlantic/South_Georgia",
63    "Atlantic/Azores",
64    "Atlantic/Cape_Verde",
65    "Africa/Casablanca",
66    "Europe/London",
67    "Europe/Amsterdam",
68    "Europe/Belgrade",
69    "Europe/Brussels",
70    "Europe/Sarajevo",
71    "Africa/Windhoek",
72    "Africa/Brazzaville",
73    "Asia/Amman",
74    "Europe/Athens",
75    "Asia/Beirut",
76    "Africa/Cairo",
77    "Europe/Helsinki",
78    "Asia/Jerusalem",
79    "Europe/Minsk",
80    "Africa/Harare",
81    "Asia/Baghdad",
82    "Europe/Moscow",
83    "Asia/Kuwait",
84    "Africa/Nairobi",
85    "Asia/Tehran",
86    "Asia/Baku",
87    "Asia/Tbilisi",
88    "Asia/Yerevan",
89    "Asia/Dubai",
90    "Asia/Kabul",
91    "Asia/Karachi",
92    "Asia/Oral",
93    "Asia/Yekaterinburg",
94    "Asia/Calcutta",
95    "Asia/Colombo",
96    "Asia/Katmandu",
97    "Asia/Almaty",
98    "Asia/Rangoon",
99    "Asia/Krasnoyarsk",
100    "Asia/Bangkok",
101    "Asia/Shanghai",
102    "Asia/Hong_Kong",
103    "Asia/Irkutsk",
104    "Asia/Kuala_Lumpur",
105    "Australia/Perth",
106    "Asia/Taipei",
107    "Asia/Seoul",
108    "Asia/Tokyo",
109    "Asia/Yakutsk",
110    "Australia/Adelaide",
111    "Australia/Darwin",
112    "Australia/Brisbane",
113    "Australia/Hobart",
114    "Australia/Sydney",
115    "Asia/Vladivostok",
116    "Pacific/Guam",
117    "Asia/Magadan",
118    "Pacific/Auckland",
119    "Pacific/Fiji",
120    "Pacific/Tongatapu",
121};
122
123static base::Lock timezone_bundle_lock;
124
125struct UResClose {
126  inline void operator() (UResourceBundle* b) const {
127    ures_close(b);
128  }
129};
130
131string16 GetExemplarCity(const icu::TimeZone& zone) {
132  // TODO(jungshik): After upgrading to ICU 4.6, use U_ICUDATA_ZONE
133  static const char* zone_bundle_name = NULL;
134
135  // These will be leaked at the end.
136  static UResourceBundle *zone_bundle = NULL;
137  static UResourceBundle *zone_strings = NULL;
138
139  UErrorCode status = U_ZERO_ERROR;
140  {
141    base::AutoLock lock(timezone_bundle_lock);
142    if (zone_bundle == NULL)
143      zone_bundle = ures_open(zone_bundle_name, uloc_getDefault(), &status);
144
145    if (zone_strings == NULL)
146      zone_strings = ures_getByKey(zone_bundle, "zone_strings", NULL, &status);
147  }
148
149  icu::UnicodeString zone_id;
150  zone.getID(zone_id);
151  std::string zone_id_str;
152  zone_id.toUTF8String(zone_id_str);
153
154  // resource keys for timezones use ':' in place of '/'.
155  ReplaceSubstringsAfterOffset(&zone_id_str, 0, "/", ":");
156  scoped_ptr_malloc<UResourceBundle, UResClose> zone_item(
157      ures_getByKey(zone_strings, zone_id_str.c_str(), NULL, &status));
158  icu::UnicodeString city;
159  if (U_FAILURE(status))
160    goto fallback;
161  city = icu::ures_getUnicodeStringByKey(zone_item.get(), "ec", &status);
162  if (U_SUCCESS(status))
163    return string16(city.getBuffer(), city.length());
164
165 fallback:
166  ReplaceSubstringsAfterOffset(&zone_id_str, 0, ":", "/");
167  // Take the last component of a timezone id (e.g. 'Baz' in 'Foo/Bar/Baz').
168  // Depending on timezones, keeping all but the 1st component
169  // (e.g. Bar/Baz) may be better, but our current list does not have
170  // any timezone for which that's the case.
171  std::string::size_type slash_pos = zone_id_str.rfind('/');
172  if (slash_pos != std::string::npos && slash_pos < zone_id_str.size())
173    zone_id_str.erase(0, slash_pos + 1);
174  // zone id has '_' in place of ' '.
175  ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
176  return ASCIIToUTF16(zone_id_str);
177}
178
179}  // namespace anonymous
180
181namespace chromeos {
182
183SystemSettingsProvider::SystemSettingsProvider() {
184  for (size_t i = 0; i < arraysize(kTimeZones); i++) {
185    timezones_.push_back(icu::TimeZone::createTimeZone(
186        icu::UnicodeString(kTimeZones[i], -1, US_INV)));
187  }
188  SystemAccess::GetInstance()->AddObserver(this);
189
190}
191
192SystemSettingsProvider::~SystemSettingsProvider() {
193  SystemAccess::GetInstance()->RemoveObserver(this);
194  STLDeleteElements(&timezones_);
195}
196
197void SystemSettingsProvider::DoSet(const std::string& path, Value* in_value) {
198  // Only the owner can change the time zone.
199  if (!UserManager::Get()->current_user_is_owner())
200    return;
201
202  if (path == kSystemTimezone) {
203    string16 value;
204    if (!in_value || !in_value->IsType(Value::TYPE_STRING) ||
205        !in_value->GetAsString(&value))
206      return;
207    const icu::TimeZone* timezone = GetTimezone(value);
208    if (!timezone)
209      return;
210    SystemAccess::GetInstance()->SetTimezone(*timezone);
211  }
212}
213
214bool SystemSettingsProvider::Get(const std::string& path,
215                                 Value** out_value) const {
216  if (path == kSystemTimezone) {
217    *out_value = Value::CreateStringValue(GetKnownTimezoneID(
218        SystemAccess::GetInstance()->GetTimezone()));
219    return true;
220  }
221  return false;
222}
223
224bool SystemSettingsProvider::HandlesSetting(const std::string& path) {
225  return ::StartsWithASCII(path, std::string("cros.system."), true);
226}
227
228void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
229  // Fires system setting change notification.
230  CrosSettings::Get()->FireObservers(kSystemTimezone);
231}
232
233ListValue* SystemSettingsProvider::GetTimezoneList() {
234  ListValue* timezoneList = new ListValue();
235  for (std::vector<icu::TimeZone*>::iterator iter = timezones_.begin();
236       iter != timezones_.end(); ++iter) {
237    const icu::TimeZone* timezone = *iter;
238    ListValue* option = new ListValue();
239    option->Append(Value::CreateStringValue(GetTimezoneID(*timezone)));
240    option->Append(Value::CreateStringValue(GetTimezoneName(*timezone)));
241    timezoneList->Append(option);
242  }
243  return timezoneList;
244}
245
246string16 SystemSettingsProvider::GetTimezoneName(
247    const icu::TimeZone& timezone) {
248  // Instead of using the raw_offset, use the offset in effect now.
249  // For instance, US Pacific Time, the offset shown will be -7 in summer
250  // while it'll be -8 in winter.
251  int raw_offset, dst_offset;
252  UDate now = icu::Calendar::getNow();
253  UErrorCode status = U_ZERO_ERROR;
254  timezone.getOffset(now, false, raw_offset, dst_offset, status);
255  DCHECK(U_SUCCESS(status));
256  int offset = raw_offset + dst_offset;
257  // offset is in msec.
258  int minute_offset = std::abs(offset) / 60000;
259  int hour_offset = minute_offset / 60;
260  int min_remainder = minute_offset % 60;
261  // Some timezones have a non-integral hour offset. So, we need to
262  // use hh:mm form.
263  std::string  offset_str = base::StringPrintf(offset >= 0 ?
264      "UTC+%d:%02d" : "UTC-%d:%02d", hour_offset, min_remainder);
265
266  // TODO(jungshik): When coming up with a better list of timezones, we also
267  // have to come up with better 'display' names. One possibility is to list
268  // multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
269  // the population of a country the city belongs to.).
270  // We can also think of using LONG_GENERIC or LOCATION once we upgrade
271  // to ICU 4.6.
272  // In the meantime, we use "LONG" name with "Exemplar City" to distinguish
273  // multiple timezones with the same "LONG" name but with different
274  // rules (e.g. US Mountain Time in Denver vs Phoenix).
275  icu::UnicodeString name;
276  timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
277  string16 result(l10n_util::GetStringFUTF16(
278      IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE, ASCIIToUTF16(offset_str),
279      string16(name.getBuffer(), name.length()), GetExemplarCity(timezone)));
280  base::i18n::AdjustStringForLocaleDirection(&result);
281  return result;
282}
283
284string16 SystemSettingsProvider::GetTimezoneID(
285    const icu::TimeZone& timezone) {
286  icu::UnicodeString id;
287  timezone.getID(id);
288  return string16(id.getBuffer(), id.length());
289}
290
291const icu::TimeZone* SystemSettingsProvider::GetTimezone(
292    const string16& timezone_id) {
293  for (std::vector<icu::TimeZone*>::iterator iter = timezones_.begin();
294       iter != timezones_.end(); ++iter) {
295    const icu::TimeZone* timezone = *iter;
296    if (GetTimezoneID(*timezone) == timezone_id) {
297      return timezone;
298    }
299  }
300  return NULL;
301}
302
303string16 SystemSettingsProvider::GetKnownTimezoneID(
304    const icu::TimeZone& timezone) const {
305  for (std::vector<icu::TimeZone*>::const_iterator iter = timezones_.begin();
306       iter != timezones_.end(); ++iter) {
307    const icu::TimeZone* known_timezone = *iter;
308    if (known_timezone->hasSameRules(timezone))
309      return GetTimezoneID(*known_timezone);
310  }
311
312  // Not able to find a matching timezone in our list.
313  return string16();
314}
315
316}  // namespace chromeos
317