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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/host/setup/oauth_host_starter.h"
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/strings/string_util.h"
#include "google_apis/google_api_keys.h"
#include "remoting/base/directory_service_client.h"
#include "remoting/base/http_status.h"
#include "remoting/base/passthrough_oauth_token_getter.h"
#include "remoting/host/host_config.h"
#include "remoting/host/pin_hash.h"
#include "remoting/host/setup/host_starter.h"
#include "remoting/host/setup/host_starter_base.h"
#include "remoting/host/setup/host_starter_oauth_helper.h"
#include "remoting/proto/remoting/v1/directory_messages.pb.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
namespace remoting {
namespace {
// A helper class that registers and starts a host using OAuth.
class OAuthHostStarter : public HostStarterBase {
public:
explicit OAuthHostStarter(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory);
OAuthHostStarter(const OAuthHostStarter&) = delete;
OAuthHostStarter& operator=(const OAuthHostStarter&) = delete;
~OAuthHostStarter() override;
void OnUserTokensRetrieved(const std::string& user_email,
const std::string& access_token,
const std::string& refresh_token,
const std::string& scopes);
// HostStarterBase implementation.
void RetrieveApiAccessToken() override;
void RegisterNewHost(std::optional<std::string> access_token) override;
void RemoveOldHostFromDirectory(base::OnceClosure on_host_removed) override;
void ApplyConfigValues(base::Value::Dict& config) override;
// DirectoryServiceClient callbacks.
void OnDeleteHostResponse(
const HttpStatus& status,
std::unique_ptr<apis::v1::DeleteHostResponse> response);
void OnRegisterHostResponse(
const HttpStatus& status,
std::unique_ptr<apis::v1::RegisterHostResponse> response);
private:
base::OnceClosure on_host_removed_;
PassthroughOAuthTokenGetter token_getter_;
DirectoryServiceClient directory_service_client_;
HostStarterOAuthHelper oauth_helper_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtr<OAuthHostStarter> weak_ptr_;
base::WeakPtrFactory<OAuthHostStarter> weak_ptr_factory_{this};
};
OAuthHostStarter::OAuthHostStarter(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
: HostStarterBase(url_loader_factory),
directory_service_client_(&token_getter_, url_loader_factory),
oauth_helper_(url_loader_factory) {
weak_ptr_ = weak_ptr_factory_.GetWeakPtr();
}
OAuthHostStarter::~OAuthHostStarter() = default;
void OAuthHostStarter::RetrieveApiAccessToken() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
CHECK(!params().auth_code.empty());
oauth_helper_.FetchTokens(
params().owner_email, params().auth_code,
{
.client_id =
google_apis::GetOAuth2ClientID(google_apis::CLIENT_REMOTING),
.client_secret =
google_apis::GetOAuth2ClientSecret(google_apis::CLIENT_REMOTING),
.redirect_uri = params().redirect_url,
},
base::BindOnce(&OAuthHostStarter::OnUserTokensRetrieved, weak_ptr_),
base::BindOnce(&OAuthHostStarter::HandleError, weak_ptr_));
}
void OAuthHostStarter::OnUserTokensRetrieved(const std::string& user_email,
const std::string& access_token,
const std::string& refresh_token,
const std::string& scope_str) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// If an owner email was not provided, then use the account which created the
// authorization code.
if (params().owner_email.empty()) {
params().owner_email = base::ToLowerASCII(user_email);
}
// We don't need a `refresh_token` for the user so ignore it even if the
// authorization_code was created with the offline param.
RegisterNewHost(access_token);
}
void OAuthHostStarter::RegisterNewHost(
std::optional<std::string> access_token) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(access_token.has_value());
DCHECK(!access_token->empty());
token_getter_.set_access_token(*access_token);
directory_service_client_.RegisterHost(
params().id, params().name, key_pair().GetPublicKey(),
google_apis::GetOAuth2ClientID(google_apis::CLIENT_REMOTING_HOST),
base::BindOnce(&OAuthHostStarter::OnRegisterHostResponse,
weak_ptr_factory_.GetWeakPtr()));
}
void OAuthHostStarter::RemoveOldHostFromDirectory(
base::OnceClosure on_host_removed) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
on_host_removed_ = std::move(on_host_removed);
if (existing_host_id().has_value()) {
directory_service_client_.DeleteHost(
*existing_host_id(),
base::BindOnce(&OAuthHostStarter::OnDeleteHostResponse,
weak_ptr_factory_.GetWeakPtr()));
} else {
std::move(on_host_removed_).Run();
}
}
void OAuthHostStarter::ApplyConfigValues(base::Value::Dict& config) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
config.Set(kHostTypeHintPath, kMe2MeHostTypeHint);
config.Set(kHostSecretHashConfigPath,
MakeHostPinHash(params().id, params().pin));
}
void OAuthHostStarter::OnRegisterHostResponse(
const HttpStatus& status,
std::unique_ptr<apis::v1::RegisterHostResponse> response) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!status.ok()) {
HandleHttpStatusError(status);
return;
}
OnNewHostRegistered(base::ToLowerASCII(response->host_info().host_id()),
/*owner_account_email=*/std::string(),
/*service_account_email=*/std::string(),
response->auth_code());
}
void OAuthHostStarter::OnDeleteHostResponse(
const HttpStatus& status,
std::unique_ptr<apis::v1::DeleteHostResponse> response) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!status.ok()) {
LOG(ERROR) << "Error occurred when unregistering the existing host.";
}
std::move(on_host_removed_).Run();
}
} // namespace
std::unique_ptr<HostStarter> CreateOAuthHostStarter(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory) {
return std::make_unique<OAuthHostStarter>(url_loader_factory);
}
} // namespace remoting
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