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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.
- #ifndef ASH_COMPONENTS_PROXIMITY_AUTH_PROXIMITY_MONITOR_IMPL_H_
- #define ASH_COMPONENTS_PROXIMITY_AUTH_PROXIMITY_MONITOR_IMPL_H_
- #include <memory>
- #include "ash/components/multidevice/remote_device_ref.h"
- #include "ash/components/proximity_auth/proximity_monitor.h"
- #include "ash/services/secure_channel/public/mojom/secure_channel.mojom.h"
- #include "base/memory/weak_ptr.h"
- #include "device/bluetooth/bluetooth_device.h"
- #include "third_party/abseil-cpp/absl/types/optional.h"
- namespace ash {
- namespace secure_channel {
- class ClientChannel;
- }
- } // namespace ash
- namespace device {
- class BluetoothAdapter;
- } // namespace device
- namespace proximity_auth {
- // The concrete implemenation of the proximity monitor interface.
- class ProximityMonitorImpl : public ProximityMonitor {
- public:
- // The |connection| is not owned, and must outlive |this| instance.
- ProximityMonitorImpl(ash::multidevice::RemoteDeviceRef remote_device,
- ash::secure_channel::ClientChannel* channel);
- ProximityMonitorImpl(const ProximityMonitorImpl&) = delete;
- ProximityMonitorImpl& operator=(const ProximityMonitorImpl&) = delete;
- ~ProximityMonitorImpl() override;
- // ProximityMonitor:
- void Start() override;
- void Stop() override;
- bool IsUnlockAllowed() const override;
- void RecordProximityMetricsOnAuthSuccess() override;
- private:
- // Callback for asynchronous initialization of the Bluetooth adpater.
- void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
- // Ensures that the app is periodically polling for the proximity status
- // between the remote and the local device iff it should be, based on the
- // current app state.
- void UpdatePollingState();
- // Performs a scheduled |UpdatePollingState()| operation. This method is
- // used to distinguish periodically scheduled calls to |UpdatePollingState()|
- // from event-driven calls, which should be handled differently.
- void PerformScheduledUpdatePollingState();
- // Returns |true| iff the app should be periodically polling for the proximity
- // status between the remote and the local device.
- bool ShouldPoll() const;
- // Polls the connection information.
- void Poll();
- void OnGetConnectionMetadata(
- ash::secure_channel::mojom::ConnectionMetadataPtr connection_metadata);
- void OnGetRssi(const absl::optional<int32_t>& rssi);
- // Resets the proximity state to |false|, and clears all member variables
- // tracking the proximity state.
- void ClearProximityState();
- // Updates the proximity state with a new sample of the current RSSI.
- void AddSample(int32_t rssi);
- // Checks whether the proximity state has changed based on the current
- // samples. Notifies observers on a change.
- void CheckForProximityStateChange();
- // Used to get the name of the remote device that ProximitMonitor is
- // communicating with, for metrics purposes.
- ash::multidevice::RemoteDeviceRef remote_device_;
- // Used to communicate with the remote device to gauge its proximity via RSSI
- // measurement.
- ash::secure_channel::ClientChannel* channel_;
- // The Bluetooth adapter that will be polled for connection info.
- scoped_refptr<device::BluetoothAdapter> bluetooth_adapter_;
- // Whether the remote device is currently in close proximity to the local
- // device.
- bool remote_device_is_in_proximity_;
- // Whether the proximity monitor is active, i.e. should possibly be scanning
- // for proximity to the remote device.
- bool is_active_;
- // The exponentailly weighted rolling average of the RSSI, used to smooth the
- // RSSI readings. Null if the monitor is inactive, has not recently observed
- // an RSSI reading, or the most recent connection info included an invalid
- // measurement.
- std::unique_ptr<double> rssi_rolling_average_;
- // Used to vend weak pointers for polling. Using a separate factory for these
- // weak pointers allows the weak pointers to be invalidated when polling
- // stops, which effectively cancels the scheduled tasks.
- base::WeakPtrFactory<ProximityMonitorImpl> polling_weak_ptr_factory_{this};
- // Used to vend all other weak pointers.
- base::WeakPtrFactory<ProximityMonitorImpl> weak_ptr_factory_{this};
- };
- } // namespace proximity_auth
- #endif // ASH_COMPONENTS_PROXIMITY_AUTH_PROXIMITY_MONITOR_IMPL_H_
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