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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/nearby_sharing/fast_initiation/fast_initiation_advertiser.h"
#include <string>
#include "base/functional/callback_helpers.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "chrome/browser/nearby_sharing/fast_initiation/constants.h"
#include "components/cross_device/logging/logging.h"
#include "device/bluetooth/bluetooth_advertisement.h"
namespace {
enum class FastInitVersion : uint8_t {
kV1 = 0,
};
// This is the canonical service UUID used in outgoing Fast Initiation
// advertisements. The service UUID of 0xfe2c is shared with
// FastInitiationScanner in constants.h.
constexpr const char kFastInitiationServiceUuid[] =
"0000fe2c-0000-1000-8000-00805f9b34fb";
const FastInitVersion kVersion = FastInitVersion::kV1;
const uint8_t kVersionBitmask = 0b111;
const uint8_t kTypeBitmask = 0b111;
// TODO(crbug.com/1099846): This value comes from Android, but we may need to
// find a more appropriate power setting for Chrome OS devices.
const int8_t kAdjustedTxPower = -66;
} // namespace
// static
FastInitiationAdvertiser::Factory*
FastInitiationAdvertiser::Factory::factory_instance_ = nullptr;
// static
std::unique_ptr<FastInitiationAdvertiser>
FastInitiationAdvertiser::Factory::Create(
scoped_refptr<device::BluetoothAdapter> adapter) {
if (factory_instance_)
return factory_instance_->CreateInstance(adapter);
return std::make_unique<FastInitiationAdvertiser>(adapter);
}
// static
void FastInitiationAdvertiser::Factory::SetFactoryForTesting(
FastInitiationAdvertiser::Factory* factory) {
factory_instance_ = factory;
}
FastInitiationAdvertiser::FastInitiationAdvertiser(
scoped_refptr<device::BluetoothAdapter> adapter) {
DCHECK(adapter && adapter->IsPresent() && adapter->IsPowered());
adapter_ = adapter;
}
FastInitiationAdvertiser::~FastInitiationAdvertiser() {
StopAdvertising(base::DoNothing());
}
void FastInitiationAdvertiser::AdvertisementReleased(
device::BluetoothAdvertisement* advertisement) {
StopAdvertising(base::DoNothing());
}
void FastInitiationAdvertiser::StartAdvertising(
FastInitType type,
base::OnceCallback<void()> callback,
base::OnceCallback<void()> error_callback) {
DCHECK(adapter_->IsPresent() && adapter_->IsPowered());
DCHECK(!advertisement_);
RegisterAdvertisement(type, std::move(callback), std::move(error_callback));
}
void FastInitiationAdvertiser::StopAdvertising(
base::OnceCallback<void()> callback) {
if (!advertisement_) {
std::move(callback).Run();
// |this| might be destroyed here, do not access local fields.
return;
}
UnregisterAdvertisement(std::move(callback));
}
void FastInitiationAdvertiser::RegisterAdvertisement(
FastInitiationAdvertiser::FastInitType type,
base::OnceClosure callback,
base::OnceClosure error_callback) {
auto advertisement_data =
std::make_unique<device::BluetoothAdvertisement::Data>(
device::BluetoothAdvertisement::ADVERTISEMENT_TYPE_BROADCAST);
device::BluetoothAdvertisement::UUIDList list;
list.push_back(kFastInitiationServiceUuid);
advertisement_data->set_service_uuids(std::move(list));
device::BluetoothAdvertisement::ServiceData service_data;
auto payload = std::vector<uint8_t>(std::begin(kFastInitiationModelId),
std::end(kFastInitiationModelId));
auto metadata = GenerateFastInitV1Metadata(type);
payload.insert(std::end(payload), std::begin(metadata), std::end(metadata));
service_data.insert(std::pair<std::string, std::vector<uint8_t>>(
kFastInitiationServiceUuid, payload));
advertisement_data->set_service_data(std::move(service_data));
adapter_->RegisterAdvertisement(
std::move(advertisement_data),
base::BindOnce(&FastInitiationAdvertiser::OnRegisterAdvertisement,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)),
base::BindOnce(&FastInitiationAdvertiser::OnRegisterAdvertisementError,
weak_ptr_factory_.GetWeakPtr(),
std::move(error_callback)));
}
void FastInitiationAdvertiser::OnRegisterAdvertisement(
base::OnceClosure callback,
scoped_refptr<device::BluetoothAdvertisement> advertisement) {
advertisement_ = advertisement;
advertisement_->AddObserver(this);
std::move(callback).Run();
}
void FastInitiationAdvertiser::OnRegisterAdvertisementError(
base::OnceClosure error_callback,
device::BluetoothAdvertisement::ErrorCode error_code) {
CD_LOG(ERROR, Feature::NS)
<< "FastInitiationAdvertiser::StartAdvertising() failed with "
"error code = "
<< error_code;
std::move(error_callback).Run();
// |this| might be destroyed here, do not access local fields.
}
void FastInitiationAdvertiser::UnregisterAdvertisement(
base::OnceClosure callback) {
stop_callback_ = std::move(callback);
advertisement_->RemoveObserver(this);
advertisement_->Unregister(
base::BindOnce(&FastInitiationAdvertiser::OnUnregisterAdvertisement,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&FastInitiationAdvertiser::OnUnregisterAdvertisementError,
weak_ptr_factory_.GetWeakPtr()));
}
void FastInitiationAdvertiser::OnUnregisterAdvertisement() {
advertisement_.reset();
std::move(stop_callback_).Run();
// |this| might be destroyed here, do not access local fields.
}
void FastInitiationAdvertiser::OnUnregisterAdvertisementError(
device::BluetoothAdvertisement::ErrorCode error_code) {
CD_LOG(WARNING, Feature::NS)
<< "FastInitiationAdvertiser::StopAdvertising() failed with error code = "
<< error_code;
advertisement_.reset();
std::move(stop_callback_).Run();
// |this| might be destroyed here, do not access local fields.
}
std::vector<uint8_t> FastInitiationAdvertiser::GenerateFastInitV1Metadata(
FastInitiationAdvertiser::FastInitType type) {
std::vector<uint8_t> metadata;
uint8_t versionConverted = (static_cast<uint8_t>(kVersion) & kVersionBitmask)
<< 5;
uint8_t typeConverted = (static_cast<uint8_t>(type) & kTypeBitmask) << 2;
// Note: We convert this to a positive value before transport to align with
// Android's behavior.
int8_t powerConverted = -kAdjustedTxPower;
// Note: the last two bits of this first byte correspond to 'uwb_enable' and
// 'reserved'. The Chrome implementation does not support UWB (Ultra wideband)
// and the 'reserved' bit is currently unused, so both are left empty.
metadata.push_back(versionConverted | typeConverted);
metadata.push_back(powerConverted);
return metadata;
}
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