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// Copyright (c) 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 "chromeos/network/geolocation_handler.h"
#include "base/bind.h"
#include "base/string_number_conversions.h"
#include "base/values.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/shill_manager_client.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace chromeos {
static GeolocationHandler* g_geolocation_handler = NULL;
GeolocationHandler::GeolocationHandler()
: wifi_enabled_(false),
weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
}
GeolocationHandler::~GeolocationHandler() {
ShillManagerClient* manager_client =
DBusThreadManager::Get()->GetShillManagerClient();
if (manager_client)
manager_client->RemovePropertyChangedObserver(this);
}
void GeolocationHandler::Init() {
ShillManagerClient* manager_client =
DBusThreadManager::Get()->GetShillManagerClient();
manager_client->GetProperties(
base::Bind(&GeolocationHandler::ManagerPropertiesCallback,
weak_ptr_factory_.GetWeakPtr()));
manager_client->AddPropertyChangedObserver(this);
}
// static
void GeolocationHandler::Initialize() {
CHECK(!g_geolocation_handler);
g_geolocation_handler = new GeolocationHandler();
g_geolocation_handler->Init();
}
// static
void GeolocationHandler::Shutdown() {
CHECK(g_geolocation_handler);
delete g_geolocation_handler;
g_geolocation_handler = NULL;
}
// static
GeolocationHandler* GeolocationHandler::Get() {
CHECK(g_geolocation_handler)
<< "GeolocationHandler::Get() called before Initialize()";
return g_geolocation_handler;
}
bool GeolocationHandler::GetWifiAccessPoints(
WifiAccessPointVector* access_points, int64* age_ms) {
if (!wifi_enabled_)
return false;
// Always request updated access points.
RequestWifiAccessPoints();
// If no data has been received, return false.
if (geolocation_received_time_.is_null())
return false;
if (access_points)
*access_points = wifi_access_points_;
if (age_ms) {
base::TimeDelta dtime = base::Time::Now() - geolocation_received_time_;
*age_ms = dtime.InMilliseconds();
}
return true;
}
void GeolocationHandler::OnPropertyChanged(const std::string& key,
const base::Value& value) {
HandlePropertyChanged(key, value);
}
//------------------------------------------------------------------------------
// Private methods
void GeolocationHandler::ManagerPropertiesCallback(
DBusMethodCallStatus call_status,
const base::DictionaryValue& properties) {
const base::Value* value = NULL;
if (properties.Get(flimflam::kEnabledTechnologiesProperty, &value) && value)
HandlePropertyChanged(flimflam::kEnabledTechnologiesProperty, *value);
}
void GeolocationHandler::HandlePropertyChanged(const std::string& key,
const base::Value& value) {
if (key != flimflam::kEnabledTechnologiesProperty)
return;
const base::ListValue* technologies = NULL;
if (!value.GetAsList(&technologies) || !technologies)
return;
bool wifi_was_enabled = wifi_enabled_;
wifi_enabled_ = false;
for (base::ListValue::const_iterator iter = technologies->begin();
iter != technologies->end(); ++iter) {
std::string technology;
(*iter)->GetAsString(&technology);
if (technology == flimflam::kTypeWifi) {
wifi_enabled_ = true;
break;
}
}
if (!wifi_was_enabled && wifi_enabled_)
RequestWifiAccessPoints(); // Request initial location data.
}
void GeolocationHandler::RequestWifiAccessPoints() {
DBusThreadManager::Get()->GetShillManagerClient()->GetNetworksForGeolocation(
base::Bind(&GeolocationHandler::GeolocationCallback,
weak_ptr_factory_.GetWeakPtr()));
}
void GeolocationHandler::GeolocationCallback(
DBusMethodCallStatus call_status,
const base::DictionaryValue& properties) {
if (call_status != DBUS_METHOD_CALL_SUCCESS) {
LOG(ERROR) << "Failed to get Geolocation data: " << call_status;
return;
}
wifi_access_points_.clear();
if (properties.empty())
return; // No enabled devices, don't update received time.
// Dictionary<device_type, entry_list>
for (base::DictionaryValue::Iterator iter(properties);
iter.HasNext(); iter.Advance()) {
const base::ListValue* entry_list = NULL;
if (!iter.value().GetAsList(&entry_list)) {
LOG(WARNING) << "Geolocation dictionary value not a List: " << iter.key();
continue;
}
// List[Dictionary<key, value_str>]
for (size_t i = 0; i < entry_list->GetSize(); ++i) {
const base::DictionaryValue* entry = NULL;
if (!entry_list->GetDictionary(i, &entry) || !entry) {
LOG(WARNING) << "Geolocation list value not a Dictionary: " << i;
continue;
}
// Docs: developers.google.com/maps/documentation/business/geolocation
WifiAccessPoint wap;
entry->GetString(shill::kGeoMacAddressProperty, &wap.mac_address);
std::string age_str;
if (entry->GetString(shill::kGeoAgeProperty, &age_str)) {
int64 age_ms;
if (base::StringToInt64(age_str, &age_ms)) {
wap.timestamp =
base::Time::Now() - base::TimeDelta::FromMilliseconds(age_ms);
}
}
std::string strength_str;
if (entry->GetString(shill::kGeoSignalStrengthProperty, &strength_str))
base::StringToInt(strength_str, &wap.signal_strength);
std::string signal_str;
if (entry->GetString(shill::kGeoSignalToNoiseRatioProperty, &signal_str))
base::StringToInt(signal_str, &wap.signal_to_noise);
std::string channel_str;
if (entry->GetString(shill::kGeoChannelProperty, &channel_str))
base::StringToInt(channel_str, &wap.channel);
wifi_access_points_.push_back(wap);
}
}
geolocation_received_time_ = base::Time::Now();
}
} // namespace chromeos
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