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// Copyright 2014 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.
#ifndef COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
#define COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
#include <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "components/cryptauth/connection.h"
#include "components/cryptauth/connection_finder.h"
#include "components/cryptauth/connection_observer.h"
#include "components/cryptauth/remote_device.h"
#include "components/proximity_auth/bluetooth_util.h"
#include "device/bluetooth/bluetooth_adapter.h"
#include "device/bluetooth/bluetooth_uuid.h"
namespace proximity_auth {
// This cryptauth::ConnectionFinder implementation tries to find a Bluetooth
// connection to
// the remote device by polling at a fixed interval.
class BluetoothConnectionFinder : public cryptauth::ConnectionFinder,
public cryptauth::ConnectionObserver,
public device::BluetoothAdapter::Observer {
public:
BluetoothConnectionFinder(const cryptauth::RemoteDevice& remote_device,
const device::BluetoothUUID& uuid,
const base::TimeDelta& polling_interval);
~BluetoothConnectionFinder() override;
// cryptauth::ConnectionFinder:
void Find(const cryptauth::ConnectionFinder::ConnectionCallback&
connection_callback) override;
protected:
// Exposed for mocking out the connection in tests.
virtual std::unique_ptr<cryptauth::Connection> CreateConnection();
// Calls bluetooth_util::SeekDeviceByAddress. Exposed for testing, as this
// utility function is platform dependent.
virtual void SeekDeviceByAddress(
const std::string& bluetooth_address,
const base::Closure& callback,
const bluetooth_util::ErrorCallback& error_callback);
// BluetoothAdapter::Observer:
void AdapterPresentChanged(device::BluetoothAdapter* adapter,
bool present) override;
void AdapterPoweredChanged(device::BluetoothAdapter* adapter,
bool powered) override;
private:
// Returns true iff the Bluetooth adapter is ready to make connections.
bool IsReadyToPoll();
// Attempts to connect to the |remote_device_| if the system is ready for
// another iteration of polling.
void PollIfReady();
// Posts a delayed task to call |PollIfReady|. |OnDelayedPoll()| will be
// called when the task fires.
void PostDelayedPoll();
void OnDelayedPoll();
// Callbacks for bluetooth_util::SeekDeviceByAddress().
void OnSeekedDeviceByAddress();
void OnSeekedDeviceByAddressError(const std::string& error_message);
// Unregisters |this| instance as an observer from all objects that it might
// have registered with.
void UnregisterAsObserver();
// Callback to be called when the Bluetooth adapter is initialized.
void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
// ConnectionObserver:
void OnConnectionStatusChanged(
cryptauth::Connection* connection,
cryptauth::Connection::Status old_status,
cryptauth::Connection::Status new_status) override;
// Used to invoke |connection_callback_| asynchronously, decoupling the
// callback invocation from the ConnectionObserver callstack.
void InvokeCallbackAsync();
// The remote device to connect to.
const cryptauth::RemoteDevice remote_device_;
// The UUID of the service on the remote device.
const device::BluetoothUUID uuid_;
// The time to wait between polling attempts.
const base::TimeDelta polling_interval_;
// Records the time at which the finder began searching for connections.
base::TimeTicks start_time_;
// The callback that should be called upon a successful connection.
cryptauth::ConnectionFinder::ConnectionCallback connection_callback_;
// The Bluetooth adapter over which the Bluetooth connection will be made.
scoped_refptr<device::BluetoothAdapter> adapter_;
// The Bluetooth connection that will be opened.
std::unique_ptr<cryptauth::Connection> connection_;
// Whether there is currently a polling task scheduled.
bool has_delayed_poll_scheduled_;
// Used to schedule everything else.
base::WeakPtrFactory<BluetoothConnectionFinder> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(BluetoothConnectionFinder);
};
// TODO(isherman): Make sure to wire up the controller to listen for screen lock
// state change events, and create or destroy the connection finder as
// appropriate.
} // namespace proximity_auth
#endif // COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
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