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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/ice_config_fetcher_cloud.h"
#include <algorithm>
#include <memory>
#include <optional>
#include <utility>
#include "base/functional/bind.h"
#include "base/numerics/checked_math.h"
#include "remoting/base/http_status.h"
#include "remoting/base/instance_identity_token_getter.h"
#include "remoting/proto/google/internal/remoting/cloud/v1alpha/network_traversal_service.pb.h"
#include "remoting/protocol/ice_config.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
namespace {
using google::internal::remoting::cloud::v1alpha::GenerateIceConfigResponse;
}
namespace remoting::protocol {
IceConfigFetcherCloud::IceConfigFetcherCloud(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
OAuthTokenGetter* oauth_token_getter,
InstanceIdentityTokenGetter* instance_identity_token_getter)
: service_client_(CloudServiceClient::CreateForChromotingRobotAccount(
oauth_token_getter,
url_loader_factory)),
instance_identity_token_getter_(instance_identity_token_getter) {}
IceConfigFetcherCloud::~IceConfigFetcherCloud() = default;
void IceConfigFetcherCloud::GetIceConfig(OnIceConfigCallback callback) {
CHECK(callback);
instance_identity_token_getter_->RetrieveToken(
base::BindOnce(&IceConfigFetcherCloud::GetIceConfigWithIdToken,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void IceConfigFetcherCloud::GetIceConfigWithIdToken(
OnIceConfigCallback callback,
std::string_view instance_identity_token) {
service_client_->GenerateIceConfig(
instance_identity_token,
base::BindOnce(&IceConfigFetcherCloud::OnResponse,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void IceConfigFetcherCloud::OnResponse(
OnIceConfigCallback callback,
const HttpStatus& status,
std::unique_ptr<GenerateIceConfigResponse> response) {
if (!status.ok()) {
LOG(ERROR) << "GenerateIceConfig request failed. Error code: "
<< static_cast<int>(status.error_code())
<< ", message: " << status.error_message();
std::move(callback).Run(std::nullopt);
return;
}
IceConfig ice_config;
for (const auto& server : response->stun_servers()) {
for (const auto& url : server.urls()) {
ice_config.AddStunServer(url);
}
}
// Holds the lowest allowed bitrate for any given TURN server. This is because
// we don't know which server is used for the P2P connection so we can't apply
// a specific bitrate limit based on that so instead we just choose the lowest
// positive value provided.
std::optional<int64_t> max_bitrate_kbps;
for (const auto& server : response->turn_servers()) {
for (const auto& url : server.urls()) {
ice_config.AddServer(url, server.username(), server.credential());
}
if (server.has_max_rate_kbps() && server.max_rate_kbps() > 0) {
max_bitrate_kbps =
std::min(max_bitrate_kbps.value_or(server.max_rate_kbps()),
server.max_rate_kbps());
}
}
if (max_bitrate_kbps.has_value()) {
ice_config.max_bitrate_kbps =
base::CheckedNumeric<int>(*max_bitrate_kbps).ValueOrDie();
}
if (ice_config.stun_servers.empty() && ice_config.turn_servers.empty()) {
ice_config.expiration_time = base::Time::Now();
} else {
const auto& lifetime_duration = response->lifetime_duration();
base::TimeDelta lifetime = base::Seconds(lifetime_duration.seconds()) +
base::Nanoseconds(lifetime_duration.nanos());
ice_config.expiration_time = base::Time::Now() + lifetime;
}
std::move(callback).Run(std::move(ice_config));
}
} // namespace remoting::protocol
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