зеркало из https://github.com/mozilla/gecko-dev.git
240 строки
7.4 KiB
C++
240 строки
7.4 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "base/message_loop.h"
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#include "jsapi.h"
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#include "mozilla/dom/ScriptSettings.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/Hal.h"
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#include "mozilla/Services.h"
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#include "mozilla/StaticPtr.h"
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#include "nsCOMPtr.h"
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#include "nsDebug.h"
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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#include "nsISettingsService.h"
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#include "nsJSUtils.h"
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#include "nsServiceManagerUtils.h"
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#include "nsString.h"
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#include "TimeZoneSettingObserver.h"
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#include "xpcpublic.h"
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#include "nsContentUtils.h"
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#include "nsPrintfCString.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/SettingChangeNotificationBinding.h"
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#undef LOG
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#undef ERR
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#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "Time Zone Setting" , ## args)
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#define ERR(args...) __android_log_print(ANDROID_LOG_ERROR, "Time Zone Setting" , ## args)
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#define TIME_TIMEZONE "time.timezone"
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#define MOZSETTINGS_CHANGED "mozsettings-changed"
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using namespace mozilla;
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using namespace mozilla::dom;
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namespace {
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class TimeZoneSettingObserver : public nsIObserver
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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TimeZoneSettingObserver();
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static nsresult SetTimeZone(const JS::Value &aValue, JSContext *aContext);
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protected:
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virtual ~TimeZoneSettingObserver();
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};
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class TimeZoneSettingCb final : public nsISettingsServiceCallback
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{
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public:
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NS_DECL_ISUPPORTS
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TimeZoneSettingCb() {}
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NS_IMETHOD Handle(const nsAString &aName, JS::Handle<JS::Value> aResult) {
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JSContext *cx = nsContentUtils::GetCurrentJSContext();
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NS_ENSURE_TRUE(cx, NS_OK);
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// If we don't have time.timezone value in the settings, we need
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// to initialize the settings based on the current system timezone
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// to make settings consistent with system. This usually happens
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// at the very first boot. After that, settings must have a value.
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if (aResult.isNull()) {
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// Get the current system time zone offset. Note that we need to
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// convert the value to a UTC representation in the format of
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// "UTC{+,-}hh:mm", so that the Gaia end can know how to interpret.
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// E.g., -480 is "UTC+08:00"; 630 is "UTC-10:30".
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int32_t timeZoneOffset = hal::GetTimezoneOffset();
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nsPrintfCString curTimeZone("UTC%+03d:%02d",
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-timeZoneOffset / 60,
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abs(timeZoneOffset) % 60);
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// Convert it to a JS string.
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NS_ConvertUTF8toUTF16 utf16Str(curTimeZone);
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JS::Rooted<JSString*> jsStr(cx, JS_NewUCStringCopyN(cx,
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utf16Str.get(),
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utf16Str.Length()));
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if (!jsStr) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// Set the settings based on the current system timezone.
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nsCOMPtr<nsISettingsServiceLock> lock;
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nsCOMPtr<nsISettingsService> settingsService =
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do_GetService("@mozilla.org/settingsService;1");
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if (!settingsService) {
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ERR("Failed to get settingsLock service!");
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return NS_OK;
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}
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settingsService->CreateLock(nullptr, getter_AddRefs(lock));
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JS::Rooted<JS::Value> value(cx, JS::StringValue(jsStr));
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lock->Set(TIME_TIMEZONE, value, nullptr, nullptr);
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return NS_OK;
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}
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// Set the system timezone based on the current settings.
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if (aResult.isString()) {
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return TimeZoneSettingObserver::SetTimeZone(aResult, cx);
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}
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return NS_OK;
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}
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NS_IMETHOD HandleError(const nsAString &aName) {
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ERR("TimeZoneSettingCb::HandleError: %s\n", NS_LossyConvertUTF16toASCII(aName).get());
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return NS_OK;
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}
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protected:
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~TimeZoneSettingCb() {}
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};
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NS_IMPL_ISUPPORTS(TimeZoneSettingCb, nsISettingsServiceCallback)
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TimeZoneSettingObserver::TimeZoneSettingObserver()
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{
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// Setup an observer to watch changes to the setting.
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nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
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if (!observerService) {
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ERR("GetObserverService failed");
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return;
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}
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nsresult rv;
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rv = observerService->AddObserver(this, MOZSETTINGS_CHANGED, false);
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if (NS_FAILED(rv)) {
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ERR("AddObserver failed");
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return;
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}
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// Read the 'time.timezone' setting in order to start with a known
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// value at boot time. The handle() will be called after reading.
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nsCOMPtr<nsISettingsServiceLock> lock;
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nsCOMPtr<nsISettingsService> settingsService =
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do_GetService("@mozilla.org/settingsService;1");
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if (!settingsService) {
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ERR("Failed to get settingsLock service!");
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return;
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}
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settingsService->CreateLock(nullptr, getter_AddRefs(lock));
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nsCOMPtr<nsISettingsServiceCallback> callback = new TimeZoneSettingCb();
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lock->Get(TIME_TIMEZONE, callback);
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}
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nsresult TimeZoneSettingObserver::SetTimeZone(const JS::Value &aValue, JSContext *aContext)
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{
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// Convert the JS value to a nsCString type.
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// The value should be a JS string like "America/Chicago" or "UTC-05:00".
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nsAutoJSString valueStr;
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if (!valueStr.init(aContext, aValue.toString())) {
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ERR("Failed to convert JS value to nsCString");
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return NS_ERROR_FAILURE;
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}
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NS_ConvertUTF16toUTF8 newTimezone(valueStr);
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// Hal expects opposite sign from general notations,
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// so we need to flip it.
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if (newTimezone.Find(NS_LITERAL_CSTRING("UTC+")) == 0) {
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if (!newTimezone.SetCharAt('-', 3)) {
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return NS_ERROR_FAILURE;
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}
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} else if (newTimezone.Find(NS_LITERAL_CSTRING("UTC-")) == 0) {
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if (!newTimezone.SetCharAt('+', 3)) {
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return NS_ERROR_FAILURE;
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}
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}
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// Set the timezone only when the system timezone is not identical.
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nsCString curTimezone = hal::GetTimezone();
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if (!curTimezone.Equals(newTimezone)) {
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hal::SetTimezone(newTimezone);
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}
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return NS_OK;
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}
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TimeZoneSettingObserver::~TimeZoneSettingObserver()
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{
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nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
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if (observerService) {
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observerService->RemoveObserver(this, MOZSETTINGS_CHANGED);
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}
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}
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NS_IMPL_ISUPPORTS(TimeZoneSettingObserver, nsIObserver)
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NS_IMETHODIMP
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TimeZoneSettingObserver::Observe(nsISupports *aSubject,
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const char *aTopic,
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const char16_t *aData)
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{
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if (strcmp(aTopic, MOZSETTINGS_CHANGED) != 0) {
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return NS_OK;
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}
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// Note that this function gets called for any and all settings changes,
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// so we need to carefully check if we have the one we're interested in.
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//
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// The string that we're interested in will be a JSON string that looks like:
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// {"key":"time.timezone","value":"America/Chicago"} or
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// {"key":"time.timezone","value":"UTC-05:00"}
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AutoSafeJSContext cx;
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RootedDictionary<SettingChangeNotification> setting(cx);
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if (!WrappedJSToDictionary(cx, aSubject, setting)) {
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return NS_OK;
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}
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if (!setting.mKey.EqualsASCII(TIME_TIMEZONE)) {
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return NS_OK;
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}
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if (!setting.mValue.isString()) {
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return NS_OK;
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}
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// Set the system timezone.
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return SetTimeZone(setting.mValue, cx);
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}
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} // anonymous namespace
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static mozilla::StaticRefPtr<TimeZoneSettingObserver> sTimeZoneSettingObserver;
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namespace mozilla {
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namespace system {
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void
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InitializeTimeZoneSettingObserver()
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{
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sTimeZoneSettingObserver = new TimeZoneSettingObserver();
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ClearOnShutdown(&sTimeZoneSettingObserver);
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}
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} // namespace system
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} // namespace mozilla
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