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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/network_time/network_time_service.h"
#include "base/command_line.h"
#include "base/prefs/pref_service.h"
#include "chrome/browser/network_time/network_time_tracker.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "components/user_prefs/pref_registry_syncable.h"
// static
void NetworkTimeService::RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterDictionaryPref(
prefs::kNetworkTimeMapping,
new base::DictionaryValue(),
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
}
NetworkTimeService::NetworkTimeService(Profile* profile)
: profile_(profile) {
if (!CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableNetworkTime)) {
return;
}
network_time_tracker_.reset(new NetworkTimeTracker);
network_time_tracker_->Start();
const base::DictionaryValue* time_mapping =
profile_->GetPrefs()->GetDictionary(prefs::kNetworkTimeMapping);
double local_time_js;
double network_time_js;
if (time_mapping->GetDouble("local", &local_time_js) &&
time_mapping->GetDouble("network", &network_time_js)) {
base::Time local_time_saved = base::Time::FromJsTime(local_time_js);
if (local_time_saved > base::Time::Now() ||
base::Time::Now() - local_time_saved > base::TimeDelta::FromDays(7)) {
// Drop saved mapping if clock skew has changed or the data is too old.
profile_->GetPrefs()->ClearPref(prefs::kNetworkTimeMapping);
} else {
network_time_tracker_->InitFromSavedTime(
NetworkTimeTracker::TimeMapping(
local_time_saved, base::Time::FromJsTime(network_time_js)));
}
}
}
NetworkTimeService::~NetworkTimeService() {}
void NetworkTimeService::Shutdown() {
if (!network_time_tracker_)
return;
if (network_time_tracker_->received_network_time()) {
// Update time mapping if tracker received time update from server, i.e.
// mapping is accurate.
base::Time local_now = base::Time::Now();
base::Time network_now = GetNetworkTime(local_now);
base::DictionaryValue time_mapping;
time_mapping.SetDouble("local", local_now.ToJsTime());
time_mapping.SetDouble("network", network_now.ToJsTime());
profile_->GetPrefs()->Set(prefs::kNetworkTimeMapping, time_mapping);
}
}
base::Time NetworkTimeService::GetNetworkTime(
const base::Time& local_time) {
if (!network_time_tracker_.get() || local_time.is_null() ||
local_time.is_max())
return local_time;
base::Time network_time_now;
if (!network_time_tracker_->GetNetworkTime(base::TimeTicks::Now(),
&network_time_now, NULL)) {
return local_time;
}
return local_time + (network_time_now - base::Time::Now());
}
base::Time NetworkTimeService::GetNetworkNow() {
return GetNetworkTime(base::Time::Now());
}
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