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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/ash/secure_channel/nearby_endpoint_finder_impl.h"
#include "base/base64.h"
#include "base/memory/ptr_util.h"
#include "base/rand_util.h"
#include "chromeos/ash/components/multidevice/logging/logging.h"
#include "chromeos/ash/services/secure_channel/public/mojom/nearby_connector.mojom.h"
#include "chromeos/ash/services/secure_channel/util/histogram_util.h"
namespace ash {
namespace secure_channel {
namespace {
using ::nearby::connections::mojom::DiscoveredEndpointInfoPtr;
using ::nearby::connections::mojom::DiscoveryOptions;
using ::nearby::connections::mojom::MediumSelection;
using ::nearby::connections::mojom::Status;
using ::nearby::connections::mojom::Strategy;
NearbyEndpointFinderImpl::Factory* g_test_factory = nullptr;
const size_t kEndpointIdLength = 4u;
const size_t kEndpointInfoLength = 4u;
void OnStopDiscoveryDestructorResult(Status status) {
util::RecordStopDiscoveryResult(status);
if (status != Status::kSuccess)
PA_LOG(WARNING) << "Failed to stop discovery as part of destructor";
}
std::string GenerateEndpointId() {
// Generate a random array of bytes; as long as it is of size of at least
// 3/4 kEndpointInfoLength, the final substring of the Base64-encoded array
// will be of size kEndpointInfoLength.
std::vector<uint8_t> raw_endpoint_info =
base::RandBytesAsVector(kEndpointIdLength);
// Return the first kEndpointIdLength characters of the Base64-encoded string.
return base::Base64Encode(raw_endpoint_info).substr(0, kEndpointIdLength);
}
std::vector<uint8_t> GenerateEndpointInfo(const std::vector<uint8_t>& eid) {
if (eid.size() < 2) {
return base::RandBytesAsVector(kEndpointInfoLength);
}
std::vector<uint8_t> endpoint_info = {
// version number
1,
// 2 bytes indicating the EID
eid[0],
eid[1],
};
return endpoint_info;
}
} // namespace
// static
std::unique_ptr<NearbyEndpointFinder> NearbyEndpointFinderImpl::Factory::Create(
const mojo::SharedRemote<::nearby::connections::mojom::NearbyConnections>&
nearby_connections) {
if (g_test_factory)
return g_test_factory->CreateInstance(nearby_connections);
return base::WrapUnique(new NearbyEndpointFinderImpl(nearby_connections));
}
// static
void NearbyEndpointFinderImpl::Factory::SetFactoryForTesting(
Factory* test_factory) {
g_test_factory = test_factory;
}
NearbyEndpointFinderImpl::NearbyEndpointFinderImpl(
const mojo::SharedRemote<::nearby::connections::mojom::NearbyConnections>&
nearby_connections)
: nearby_connections_(nearby_connections),
endpoint_id_(GenerateEndpointId()) {}
NearbyEndpointFinderImpl::~NearbyEndpointFinderImpl() {
if (is_discovery_active_) {
nearby_connections_->StopDiscovery(
mojom::kServiceId, base::BindOnce(&OnStopDiscoveryDestructorResult));
}
}
void NearbyEndpointFinderImpl::PerformFindEndpoint() {
is_discovery_active_ = true;
endpoint_info_ = GenerateEndpointInfo(eid());
nearby_connections_->StartDiscovery(
mojom::kServiceId,
DiscoveryOptions::New(Strategy::kP2pPointToPoint,
MediumSelection::New(/*bluetooth=*/true,
/*ble=*/false,
/*webrtc=*/false,
/*wifi_lan=*/false,
/*wifi_direct=*/false),
/*fast_advertisement_service_uuid=*/std::nullopt,
/*is_out_of_band_connection=*/true),
endpoint_discovery_listener_receiver_.BindNewPipeAndPassRemote(),
base::BindOnce(&NearbyEndpointFinderImpl::OnStartDiscoveryResult,
weak_ptr_factory_.GetWeakPtr()));
}
void NearbyEndpointFinderImpl::OnEndpointFound(const std::string& endpoint_id,
DiscoveredEndpointInfoPtr info) {
// Only look for endpoints whose endpoint metadata field matches the
// parameters passed to the InjectEndpoint() call.
if (endpoint_id_ != endpoint_id || endpoint_info_ != info->endpoint_info)
return;
PA_LOG(VERBOSE) << "Found endpoint with ID " << endpoint_id_
<< ", stopping discovery";
nearby_connections_->StopDiscovery(
mojom::kServiceId,
base::BindOnce(&NearbyEndpointFinderImpl::OnStopDiscoveryResult,
weak_ptr_factory_.GetWeakPtr(), std::move(info)));
}
void NearbyEndpointFinderImpl::OnStartDiscoveryResult(Status status) {
util::RecordStartDiscoveryResult(status);
if (status != Status::kSuccess) {
PA_LOG(WARNING) << "Failed to start Nearby discovery: " << status;
is_discovery_active_ = false;
NotifyEndpointDiscoveryFailure(status);
return;
}
PA_LOG(VERBOSE) << "Started Nearby discovery";
nearby_connections_->InjectBluetoothEndpoint(
mojom::kServiceId, endpoint_id_, endpoint_info_,
remote_device_bluetooth_address(),
base::BindOnce(&NearbyEndpointFinderImpl::OnInjectBluetoothEndpointResult,
weak_ptr_factory_.GetWeakPtr()));
}
void NearbyEndpointFinderImpl::OnInjectBluetoothEndpointResult(Status status) {
util::RecordInjectEndpointResult(status);
if (status != Status::kSuccess) {
PA_LOG(WARNING) << "Failed to inject Bluetooth endpoint: " << status;
NotifyEndpointDiscoveryFailure(status);
return;
}
PA_LOG(VERBOSE) << "Injected Bluetooth endpoint";
}
void NearbyEndpointFinderImpl::OnStopDiscoveryResult(
::nearby::connections::mojom::DiscoveredEndpointInfoPtr info,
Status status) {
util::RecordStopDiscoveryResult(status);
is_discovery_active_ = false;
if (status != Status::kSuccess) {
PA_LOG(WARNING) << "Failed to stop Nearby discovery: " << status;
NotifyEndpointDiscoveryFailure(status);
return;
}
NotifyEndpointFound(endpoint_id_, std::move(info));
}
} // namespace secure_channel
} // namespace ash
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