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