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
28 namespace {
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.
36 static 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
123 static base::Lock timezone_bundle_lock;
124
125 struct UResClose {
operator ()__anon4c56dcdf0111::UResClose126 inline void operator() (UResourceBundle* b) const {
127 ures_close(b);
128 }
129 };
130
GetExemplarCity(const icu::TimeZone & zone)131 string16 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
181 namespace chromeos {
182
SystemSettingsProvider()183 SystemSettingsProvider::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
~SystemSettingsProvider()192 SystemSettingsProvider::~SystemSettingsProvider() {
193 SystemAccess::GetInstance()->RemoveObserver(this);
194 STLDeleteElements(&timezones_);
195 }
196
DoSet(const std::string & path,Value * in_value)197 void 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
Get(const std::string & path,Value ** out_value) const214 bool 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
HandlesSetting(const std::string & path)224 bool SystemSettingsProvider::HandlesSetting(const std::string& path) {
225 return ::StartsWithASCII(path, std::string("cros.system."), true);
226 }
227
TimezoneChanged(const icu::TimeZone & timezone)228 void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
229 // Fires system setting change notification.
230 CrosSettings::Get()->FireObservers(kSystemTimezone);
231 }
232
GetTimezoneList()233 ListValue* 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
GetTimezoneName(const icu::TimeZone & timezone)246 string16 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
GetTimezoneID(const icu::TimeZone & timezone)284 string16 SystemSettingsProvider::GetTimezoneID(
285 const icu::TimeZone& timezone) {
286 icu::UnicodeString id;
287 timezone.getID(id);
288 return string16(id.getBuffer(), id.length());
289 }
290
GetTimezone(const string16 & timezone_id)291 const 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
GetKnownTimezoneID(const icu::TimeZone & timezone) const303 string16 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