mirror of
https://github.com/mozilla/gecko-dev.git
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219 lines
6.5 KiB
C++
219 lines
6.5 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/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 "nsCxPusher.h"
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#undef LOG
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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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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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virtual ~TimeZoneSettingObserver();
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static nsresult SetTimeZone(const JS::Value &aValue, JSContext *aContext);
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};
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class TimeZoneSettingCb MOZ_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, const 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 timezone and convert it to a JS string.
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nsCString curTimezone = hal::GetTimezone();
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NS_ConvertUTF8toUTF16 utf16Str(curTimezone);
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JSString *jsStr = JS_NewUCStringCopyN(cx, utf16Str.get(), utf16Str.Length());
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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(getter_AddRefs(lock));
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lock->Set(TIME_TIMEZONE, STRING_TO_JSVAL(jsStr), 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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};
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NS_IMPL_ISUPPORTS1(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(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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nsDependentJSString 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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// 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_ISUPPORTS1(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 PRUnichar *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"}
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AutoSafeJSContext cx;
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// Parse the JSON value.
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nsDependentString dataStr(aData);
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JS::Rooted<JS::Value> val(cx);
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if (!JS_ParseJSON(cx, dataStr.get(), dataStr.Length(), &val) ||
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!val.isObject()) {
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return NS_OK;
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}
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// Get the key, which should be the JS string "time.timezone".
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JSObject &obj(val.toObject());
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JS::Value key;
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if (!JS_GetProperty(cx, &obj, "key", &key) ||
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!key.isString()) {
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return NS_OK;
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}
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JSBool match;
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if (!JS_StringEqualsAscii(cx, key.toString(), TIME_TIMEZONE, &match) ||
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match != JS_TRUE) {
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return NS_OK;
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}
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// Get the value, which should be a JS string like "America/Chicago".
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JS::Value value;
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if (!JS_GetProperty(cx, &obj, "value", &value) ||
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!value.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(value, 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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