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// Copyright 2015 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 "components/proximity_auth/remote_device_life_cycle_impl.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/thread_task_runner_handle.h"
#include "base/time/default_tick_clock.h"
#include "components/proximity_auth/ble/bluetooth_low_energy_connection.h"
#include "components/proximity_auth/ble/bluetooth_low_energy_connection_finder.h"
#include "components/proximity_auth/bluetooth_connection.h"
#include "components/proximity_auth/bluetooth_connection_finder.h"
#include "components/proximity_auth/bluetooth_throttler_impl.h"
#include "components/proximity_auth/cryptauth/secure_message_delegate.h"
#include "components/proximity_auth/device_to_device_authenticator.h"
#include "components/proximity_auth/logging/logging.h"
#include "components/proximity_auth/messenger_impl.h"
#include "components/proximity_auth/proximity_auth_client.h"
#include "components/proximity_auth/secure_context.h"
namespace proximity_auth {
namespace {
// The UUID of the Smart Lock classic Bluetooth service.
const char kClassicBluetoothServiceUUID[] =
"704EE561-3782-405A-A14B-2D47A2DDCDDF";
// The UUID of the Bluetooth Low Energy service.
const char kBLESmartLockServiceUUID[] = "b3b7e28e-a000-3e17-bd86-6e97b9e28c11";
// The time to wait, in seconds, after authentication fails, before retrying
// another connection.
const int kAuthenticationRecoveryTimeSeconds = 10;
} // namespace
RemoteDeviceLifeCycleImpl::RemoteDeviceLifeCycleImpl(
const RemoteDevice& remote_device,
ProximityAuthClient* proximity_auth_client)
: remote_device_(remote_device),
proximity_auth_client_(proximity_auth_client),
state_(RemoteDeviceLifeCycle::State::STOPPED),
observers_(base::ObserverList<Observer>::NOTIFY_EXISTING_ONLY),
bluetooth_throttler_(new BluetoothThrottlerImpl(
make_scoped_ptr(new base::DefaultTickClock()))),
weak_ptr_factory_(this) {}
RemoteDeviceLifeCycleImpl::~RemoteDeviceLifeCycleImpl() {}
void RemoteDeviceLifeCycleImpl::Start() {
PA_LOG(INFO) << "Life cycle started.";
DCHECK(state_ == RemoteDeviceLifeCycle::State::STOPPED);
FindConnection();
}
RemoteDeviceLifeCycle::State RemoteDeviceLifeCycleImpl::GetState() const {
return state_;
}
Messenger* RemoteDeviceLifeCycleImpl::GetMessenger() {
return messenger_.get();
}
void RemoteDeviceLifeCycleImpl::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void RemoteDeviceLifeCycleImpl::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
scoped_ptr<ConnectionFinder>
RemoteDeviceLifeCycleImpl::CreateConnectionFinder() {
if (remote_device_.bluetooth_type == RemoteDevice::BLUETOOTH_LE) {
return make_scoped_ptr(new BluetoothLowEnergyConnectionFinder(
remote_device_, kBLESmartLockServiceUUID,
BluetoothLowEnergyConnectionFinder::FinderStrategy::FIND_PAIRED_DEVICE,
nullptr, bluetooth_throttler_.get(), 3));
} else {
return make_scoped_ptr(new BluetoothConnectionFinder(
remote_device_, device::BluetoothUUID(kClassicBluetoothServiceUUID),
base::TimeDelta::FromSeconds(3)));
}
}
scoped_ptr<Authenticator> RemoteDeviceLifeCycleImpl::CreateAuthenticator() {
return make_scoped_ptr(new DeviceToDeviceAuthenticator(
connection_.get(), remote_device_.user_id,
proximity_auth_client_->CreateSecureMessageDelegate()));
}
void RemoteDeviceLifeCycleImpl::TransitionToState(
RemoteDeviceLifeCycle::State new_state) {
PA_LOG(INFO) << "Life cycle transition: " << static_cast<int>(state_)
<< " => " << static_cast<int>(new_state);
RemoteDeviceLifeCycle::State old_state = state_;
state_ = new_state;
FOR_EACH_OBSERVER(Observer, observers_,
OnLifeCycleStateChanged(old_state, new_state));
}
void RemoteDeviceLifeCycleImpl::FindConnection() {
connection_finder_ = CreateConnectionFinder();
connection_finder_->Find(
base::Bind(&RemoteDeviceLifeCycleImpl::OnConnectionFound,
weak_ptr_factory_.GetWeakPtr()));
TransitionToState(RemoteDeviceLifeCycle::State::FINDING_CONNECTION);
}
void RemoteDeviceLifeCycleImpl::OnConnectionFound(
scoped_ptr<Connection> connection) {
DCHECK(state_ == RemoteDeviceLifeCycle::State::FINDING_CONNECTION);
connection_ = connection.Pass();
authenticator_ = CreateAuthenticator();
authenticator_->Authenticate(
base::Bind(&RemoteDeviceLifeCycleImpl::OnAuthenticationResult,
weak_ptr_factory_.GetWeakPtr()));
TransitionToState(RemoteDeviceLifeCycle::State::AUTHENTICATING);
}
void RemoteDeviceLifeCycleImpl::OnAuthenticationResult(
Authenticator::Result result,
scoped_ptr<SecureContext> secure_context) {
DCHECK(state_ == RemoteDeviceLifeCycle::State::AUTHENTICATING);
authenticator_.reset();
if (result != Authenticator::Result::SUCCESS) {
PA_LOG(WARNING) << "Waiting " << kAuthenticationRecoveryTimeSeconds
<< " seconds to retry after authentication failure.";
connection_->Disconnect();
authentication_recovery_timer_.Start(
FROM_HERE,
base::TimeDelta::FromSeconds(kAuthenticationRecoveryTimeSeconds), this,
&RemoteDeviceLifeCycleImpl::FindConnection);
TransitionToState(RemoteDeviceLifeCycle::State::AUTHENTICATION_FAILED);
return;
}
// Create the MessengerImpl asynchronously. |messenger_| registers itself as
// an observer of |connection_|, so creating it synchronously would trigger
// |OnSendCompleted()| as an observer call for |messenger_|.
secure_context_ = secure_context.Pass();
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&RemoteDeviceLifeCycleImpl::CreateMessenger,
weak_ptr_factory_.GetWeakPtr()));
}
void RemoteDeviceLifeCycleImpl::CreateMessenger() {
DCHECK(state_ == RemoteDeviceLifeCycle::State::AUTHENTICATING);
DCHECK(secure_context_);
messenger_.reset(
new MessengerImpl(connection_.Pass(), secure_context_.Pass()));
messenger_->AddObserver(this);
TransitionToState(RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
}
void RemoteDeviceLifeCycleImpl::OnDisconnected() {
DCHECK(state_ == RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
messenger_.reset();
FindConnection();
}
} // namespace proximity_auth
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