Revert of [EasyUnlock] Update BluetoothLowEnergyConnectionFinder to look for EIDs.

components/proximity_auth/bluetooth_low_energy_connection_finder.h

-// 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.
-
-#ifndef COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_LOW_ENERGY_CONNECTION_FINDER_H
-#define COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_LOW_ENERGY_CONNECTION_FINDER_H
-
-#include <memory>
-#include <set>
-#include <string>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "components/cryptauth/background_eid_generator.h"
-#include "components/cryptauth/bluetooth_throttler.h"
-#include "components/cryptauth/connection.h"
-#include "components/cryptauth/connection_finder.h"
-#include "components/cryptauth/connection_observer.h"
-#include "components/cryptauth/remote_beacon_seed_fetcher.h"
-#include "components/cryptauth/remote_device.h"
-#include "device/bluetooth/bluetooth_adapter.h"
-#include "device/bluetooth/bluetooth_device.h"
-#include "device/bluetooth/bluetooth_discovery_session.h"
-#include "device/bluetooth/bluetooth_gatt_connection.h"
-
-namespace proximity_auth {
-
-// This cryptauth::ConnectionFinder implementation is specialized in finding a
-// Bluetooth Low Energy remote device. We look for remote devices advertising
-// the expected EID for the current or nearby time intervals.
-class BluetoothLowEnergyConnectionFinder
-    : public cryptauth::ConnectionFinder,
-      public cryptauth::ConnectionObserver,
-      public device::BluetoothAdapter::Observer {
- public:
-  // Finds (and connects) to a Bluetooth low energy device, based on the EID
-  // advertised by the remote device.
-  //
-  // |remote_device|: The BLE remote device.
-  // |beacon_seeds|: The BeaconSeeds for the |remote_device.
-  // |bluetooth_throttler|: The reconnection throttler.
-  BluetoothLowEnergyConnectionFinder(
-      const cryptauth::RemoteDevice remote_device,
-      const std::vector<cryptauth::BeaconSeed>& beacon_seeds,
-      cryptauth::BluetoothThrottler* bluetooth_throttler);
-
-  ~BluetoothLowEnergyConnectionFinder() override;
-
-  // Finds a connection to the remote device.
-  void Find(const cryptauth::ConnectionFinder::ConnectionCallback&
-                connection_callback) override;
-
-  // cryptauth::ConnectionObserver:
-  void OnConnectionStatusChanged(
-      cryptauth::Connection* connection,
-      cryptauth::Connection::Status old_status,
-      cryptauth::Connection::Status new_status) override;
-
-  // device::BluetoothAdapter::Observer:
-  void AdapterPoweredChanged(device::BluetoothAdapter* adapter,
-                             bool powered) override;
-  void DeviceAdded(device::BluetoothAdapter* adapter,
-                   device::BluetoothDevice* device) override;
-  void DeviceChanged(device::BluetoothAdapter* adapter,
-                     device::BluetoothDevice* device) override;
-
- protected:
-  BluetoothLowEnergyConnectionFinder(
-      const cryptauth::RemoteDevice remote_device,
-      const std::vector<cryptauth::BeaconSeed>& beacon_seeds,
-      std::unique_ptr<cryptauth::BackgroundEidGenerator> eid_generator,
-      cryptauth::BluetoothThrottler* bluetooth_throttler);
-
-  // Creates a proximity_auth::Connection with the device given by
-  // |device_address|. Exposed for testing.
-  virtual std::unique_ptr<cryptauth::Connection> CreateConnection(
-      const std::string& device_address);
-
- private:
-  // Callback to be called when the Bluetooth adapter is initialized.
-  void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
-
-  // Checks if |remote_device| contains |remote_service_uuid| and creates a
-  // connection in that case.
-  void HandleDeviceUpdated(device::BluetoothDevice* remote_device);
-
-  // Callback called when a new discovery session is started.
-  void OnDiscoverySessionStarted(
-      std::unique_ptr<device::BluetoothDiscoverySession> discovery_session);
-
-  // Callback called when there is an error starting a new discovery session.
-  void OnStartDiscoverySessionError();
-
-  // Starts a discovery session for |adapter_|.
-  void StartDiscoverySession();
-
-  // Stops the discovery session given by |discovery_session_|.
-  void StopDiscoverySession();
-
-  // Checks if |device| is the right device: (i) has the adversement data or
-  // (ii) is paired and is the same as |remote_device|.
-  bool IsRightDevice(device::BluetoothDevice* device);
-
-  // Restarts the discovery session after creating |connection_| fails.
-  void RestartDiscoverySessionAsync();
-
-  // Used to invoke |connection_callback_| asynchronously, decoupling the
-  // callback invocation from the ConnectionObserver callstack.
-  void InvokeCallbackAsync();
-
-  // The remote BLE device being searched. It maybe empty, in this case the
-  // remote device should advertise |remote_service_uuid_| and
-  // |advertised_name_|.
-  cryptauth::RemoteDevice remote_device_;
-
-  // The BeaconSeeds of the |remote_device|.
-  std::vector<cryptauth::BeaconSeed> beacon_seeds_;
-
-  // Generates the expected EIDs that may be advertised by |remote_device_|. If
-  // an EID matches, we know its a device we should connect to.
-  std::unique_ptr<cryptauth::BackgroundEidGenerator> eid_generator_;
-
-  // Throttles repeated connection attempts to the same device. This is a
-  // workaround for crbug.com/508919. Not owned, must outlive this instance.
-  cryptauth::BluetoothThrottler* bluetooth_throttler_;
-
-  // The Bluetooth adapter over which the Bluetooth connection will be made.
-  scoped_refptr<device::BluetoothAdapter> adapter_;
-
-  // The discovery session associated to this object.
-  std::unique_ptr<device::BluetoothDiscoverySession> discovery_session_;
-
-  // The connection with |remote_device|.
-  std::unique_ptr<cryptauth::Connection> connection_;
-
-  // Callback called when the connection is established.
-  cryptauth::ConnectionFinder::ConnectionCallback connection_callback_;
-
-  base::WeakPtrFactory<BluetoothLowEnergyConnectionFinder> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyConnectionFinder);
-};
-
-}  // namespace proximity_auth
-
-#endif  // COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_LOW_ENERGY_CONNECTION_FINDER_H