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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_NEARBY_SHARING_FAST_INITIATION_FAST_INITIATION_SCANNER_H_
#define CHROME_BROWSER_NEARBY_SHARING_FAST_INITIATION_FAST_INITIATION_SCANNER_H_
#include <memory>
#include <string>
#include "base/containers/flat_set.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "device/bluetooth/bluetooth_adapter.h"
#include "device/bluetooth/bluetooth_low_energy_scan_session.h"
// FastInitiationScanner will scan for BLE advertisements using a
// BluetoothLowEnergyScanSession. It will filter for advertisements containing
// the Fast Initiation UUID 0xFE2C and service data 0xFC128E. Remote devices
// will broacast these advertisements when they are attempting to share (see
// FastInitiationAdvertiser). We use this as a signal to prompt the user to
// enable high visibility mode.
class FastInitiationScanner
: public device::BluetoothLowEnergyScanSession::Delegate {
public:
class Factory {
public:
Factory() = default;
Factory(const Factory&) = delete;
Factory& operator=(const Factory&) = delete;
static std::unique_ptr<FastInitiationScanner> Create(
scoped_refptr<device::BluetoothAdapter> adapter);
static bool IsHardwareSupportAvailable(device::BluetoothAdapter* adapter);
static void SetFactoryForTesting(Factory* factory);
protected:
virtual ~Factory() = default;
virtual std::unique_ptr<FastInitiationScanner> CreateInstance(
scoped_refptr<device::BluetoothAdapter> adapter) = 0;
virtual bool IsHardwareSupportAvailable() = 0;
private:
static Factory* factory_instance_;
};
explicit FastInitiationScanner(
scoped_refptr<device::BluetoothAdapter> adapter);
~FastInitiationScanner() override;
FastInitiationScanner(const FastInitiationScanner&) = delete;
FastInitiationScanner& operator=(const FastInitiationScanner&) = delete;
virtual void StartScanning(
base::RepeatingClosure devices_detected_callback,
base::RepeatingClosure devices_not_detected_callback,
base::OnceClosure scanner_invalidated_callback);
private:
// device::BluetoothLowEnergyScanSession::Delegate:
void OnSessionStarted(
device::BluetoothLowEnergyScanSession* scan_session,
std::optional<device::BluetoothLowEnergyScanSession::ErrorCode>
error_code) override;
void OnDeviceFound(device::BluetoothLowEnergyScanSession* scan_session,
device::BluetoothDevice* device) override;
void OnDeviceLost(device::BluetoothLowEnergyScanSession* scan_session,
device::BluetoothDevice* device) override;
void OnSessionInvalidated(
device::BluetoothLowEnergyScanSession* scan_session) override;
scoped_refptr<device::BluetoothAdapter> adapter_;
base::RepeatingClosure devices_detected_callback_;
base::RepeatingClosure devices_not_detected_callback_;
base::OnceClosure scanner_invalidated_callback_;
std::unique_ptr<device::BluetoothLowEnergyScanSession>
background_scan_session_;
// Set of remote devices that we detect are currently emitting fast initiation
// advertisements.
base::flat_set<std::string> detected_devices_;
// The last time that devices detected went from zero to greater than zero.
base::TimeTicks devices_detected_timestamp_;
base::WeakPtrFactory<FastInitiationScanner> weak_ptr_factory_{this};
};
#endif // CHROME_BROWSER_NEARBY_SHARING_FAST_INITIATION_FAST_INITIATION_SCANNER_H_
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