gecko/dom/system/gonk/TimeZoneSettingObserver.cpp

235 lines
7.3 KiB
C++

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