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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 ASH_QUICK_PAIR_FAST_PAIR_HANDSHAKE_FAST_PAIR_HANDSHAKE_H_
#define ASH_QUICK_PAIR_FAST_PAIR_HANDSHAKE_FAST_PAIR_HANDSHAKE_H_
#include <memory>
#include <optional>
#include "ash/quick_pair/common/pair_failure.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
namespace device {
class BluetoothAdapter;
} // namespace device
namespace ash {
namespace quick_pair {
class Device;
class FastPairDataEncryptor;
class FastPairGattServiceClient;
// This class performs the Fast Pair handshake procedure upon creation and
// calls |on_complete| once finished. It also exposes the
// |FastPairDataEncryptor| and |FastPairGattServiceClient| instances that were
// used during the handshake.
//
// The procedure steps are as follows:
// 1. Create a GATT connection to the device.
// 2. Create a data encryptor instance with the appropriate keys.
// 3. Write the Key-Based Pairing Request to the characteristic
// (https://developers.google.com/nearby/fast-pair/spec#table1.1)
// 4. Decrypt the response.
// 5. Validate response.
// 6. Set classic address field on |Device| instance.
// 7. Complete.
class FastPairHandshake {
public:
using OnCompleteCallback =
base::OnceCallback<void(scoped_refptr<Device>,
std::optional<PairFailure>)>;
using OnCompleteCallbackNew = base::OnceCallback<void(scoped_refptr<Device>)>;
using OnFailureCallback =
base::OnceCallback<void(std::optional<PairFailure>)>;
using OnBleAddressRotationCallback = base::OnceClosure;
// TODO(b/265853116): After the Fast Pair Handshake code is refactored remove
// this constructor in favor of the two argument constructor below.
FastPairHandshake(
scoped_refptr<device::BluetoothAdapter> adapter,
scoped_refptr<Device> device,
OnCompleteCallback on_complete,
std::unique_ptr<FastPairDataEncryptor> data_encryptor,
std::unique_ptr<FastPairGattServiceClient> gatt_service_client);
FastPairHandshake(scoped_refptr<device::BluetoothAdapter> adapter,
scoped_refptr<Device> device);
FastPairHandshake(const FastPairHandshake&) = delete;
FastPairHandshake& operator=(const FastPairHandshake&) = delete;
virtual ~FastPairHandshake();
virtual void SetUpHandshake(OnFailureCallback on_failure_callback,
OnCompleteCallbackNew on_success_callback) = 0;
virtual void Reset() = 0;
bool completed_successfully() { return completed_successfully_; }
void set_completed_successfully() { completed_successfully_ = true; }
FastPairDataEncryptor* fast_pair_data_encryptor() {
return fast_pair_data_encryptor_.get();
}
void BleAddressRotated(OnBleAddressRotationCallback callback) {
on_ble_address_rotation_callback_ = std::move(callback);
}
bool DidBleAddressRotate() {
return !on_ble_address_rotation_callback_.is_null();
}
void RunBleAddressRotationCallback() {
return std::move(on_ble_address_rotation_callback_).Run();
}
protected:
bool completed_successfully_ = false;
scoped_refptr<device::BluetoothAdapter> adapter_;
scoped_refptr<Device> device_;
// TODO(b/265853116): Audit FastPairHandshake code once refactor is completed
// and legacy code is removed.
OnCompleteCallback on_complete_callback_;
OnCompleteCallbackNew on_complete_callback_new_;
OnFailureCallback on_failure_callback_;
std::unique_ptr<FastPairDataEncryptor> fast_pair_data_encryptor_;
// This callback will only be set if a BLE Address rotation happens during a
// retroactive pair. The callback being set signals that a rotation
// happened, if the callback has no value, a rotation did not occur.
OnBleAddressRotationCallback on_ble_address_rotation_callback_;
};
} // namespace quick_pair
} // namespace ash
#endif // ASH_QUICK_PAIR_FAST_PAIR_HANDSHAKE_FAST_PAIR_HANDSHAKE_H_
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