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

components/proximity_auth/ble/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_BLE_BLUETOOTH_LOW_ENERGY_CONNECTION_FINDER_H
+#define COMPONENTS_PROXIMITY_AUTH_BLE_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/bluetooth_throttler.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 "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 {
+
+class BluetoothLowEnergyDeviceWhitelist;
+
+// This cryptauth::ConnectionFinder implementation is specialized in finding a
+// Bluetooth
+// Low Energy remote device.
+class BluetoothLowEnergyConnectionFinder
+    : public cryptauth::ConnectionFinder,
+      public cryptauth::ConnectionObserver,
+      public device::BluetoothAdapter::Observer {
+ public:
+  enum FinderStrategy { FIND_PAIRED_DEVICE, FIND_ANY_DEVICE };
+
+  // Finds (and connects) to a Bluetooth low energy device. There are two
+  // possible search strategies depending on |finder_strategy|:
+  // (i) |FIND_PAIRED_DEVICE| searches for the unique paired bluetooth
+  // |remote_device|;
+  // (ii) |FIND_ANY_DEVICE| searches for any device advertising
+  // |remote_service_uuid|.
+  //
+  // |remote_device|: The BLE remote device. |remote_device.bluetooth_adress|
+  // should be empty when |has_public_bluetooth_address| is false.
+  // |remote_service_uuid|: The UUID of the service used to send/receive data in
+  // remote device.
+  // |bluetooth_throttler|: The reconnection throttler.
+  // |max_number_of_tries|: Maximum number attempts to send a message before
+  // disconnecting.
+  // TODO(sacomoto): Remove |device_whitelist| when ProximityAuthBleSystem is
+  // not needed anymore.
+  BluetoothLowEnergyConnectionFinder(
+      const cryptauth::RemoteDevice remote_device,
+      const std::string& remote_service_uuid,
+      const FinderStrategy finder_strategy,
+      const BluetoothLowEnergyDeviceWhitelist* device_whitelist,
+      cryptauth::BluetoothThrottler* bluetooth_throttler,
+      int max_number_of_tries);
+
+  ~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:
+  // 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);
+
+  // Checks if |remote_device| is advertising |remote_service_uuid_|.
+  bool HasService(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();
+
+  // Returns the device with |device_address|.
+  device::BluetoothDevice* GetDevice(const std::string& device_address);
+
+  // 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 uuid of the service it looks for to establish a GattConnection.
+  device::BluetoothUUID remote_service_uuid_;
+
+  // The finder strategy being used. See |IsRightDevice()|.
+  const FinderStrategy finder_strategy_;
+
+  // Devices in |device_whitelist_| don't need to have |remote_service_uuid_|
+  // cached or advertised. Not owned, must outlive this instance.
+  // TODO(sacomoto): Remove |device_whitelist_| when ProximityAuthBleSystem is
+  // not needed anymore.
+  const BluetoothLowEnergyDeviceWhitelist* device_whitelist_;
+
+  // 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_;
+
+  // BluetoothLowEnergyConnection parameter.
+  int max_number_of_tries_;
+
+  base::WeakPtrFactory<BluetoothLowEnergyConnectionFinder> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyConnectionFinder);
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_BLE_BLUETOOTH_CONNECTION_FINDER_H