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// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_BUILDTOOL_AUTH_AUTHENTICATION_HPP
#define INCLUDED_SRC_BUILDTOOL_AUTH_AUTHENTICATION_HPP
#include <cstdint>
#include <filesystem>
#include <fstream>
#include <optional>
#include <streambuf>
#include <string>
#include <utility>
#include <gsl-lite/gsl-lite.hpp>
#include "src/buildtool/logging/logger.hpp"
enum class AuthMethod : std::uint8_t { kNONE, kTLS };
class Auth {
public:
[[nodiscard]] static auto Instance() noexcept -> Auth& {
static Auth instance{};
return instance;
}
static void SetAuthMethod(AuthMethod x) { Instance().auth_ = x; }
[[nodiscard]] static auto GetAuthMethod() noexcept -> AuthMethod {
return Instance().auth_;
}
class TLS {
public:
[[nodiscard]] static auto Instance() noexcept -> TLS& {
static TLS instance{};
return instance;
}
[[nodiscard]] static auto CACert() noexcept -> const std::string& {
return Instance().ca_cert_;
}
[[nodiscard]] static auto ClientCert() noexcept -> const std::string& {
return Instance().client_cert_;
}
[[nodiscard]] static auto ClientKey() noexcept -> const std::string& {
return Instance().client_key_;
}
[[nodiscard]] static auto ServerCert() noexcept -> const std::string& {
return Instance().server_cert_;
}
[[nodiscard]] static auto ServerKey() noexcept -> const std::string& {
return Instance().server_key_;
}
[[nodiscard]] static auto SetCACertificate(
std::filesystem::path const& cert_file) noexcept -> bool {
return set(cert_file, &Instance().ca_cert_);
}
[[nodiscard]] static auto SetClientCertificate(
std::filesystem::path const& cert_file) noexcept -> bool {
return set(cert_file, &Instance().client_cert_);
}
[[nodiscard]] static auto SetClientKey(
std::filesystem::path const& key_file) noexcept -> bool {
return set(key_file, &Instance().client_key_);
}
[[nodiscard]] static auto SetServerCertificate(
std::filesystem::path const& cert_file) noexcept -> bool {
return set(cert_file, &Instance().server_cert_);
}
[[nodiscard]] static auto SetServerKey(
std::filesystem::path const& key_file) noexcept -> bool {
return set(key_file, &Instance().server_key_);
}
// must be called after the parsing of cmd line arguments
// we ensure that either both tls_client_cert or tls_client_key are set
// or none of the two.
[[nodiscard]] static auto Validate() noexcept -> bool {
if (CACert().empty()) {
Logger::Log(LogLevel::Error, "Please provide tls-ca-cert");
return false;
}
// to enable mTLS, both tls_client_{certificate,key} must be
// supplied
if (ClientCert().empty() && not(ClientKey().empty())) {
Logger::Log(LogLevel::Error,
"Please also provide tls-client-cert");
return false;
}
if (not(ClientCert().empty()) && ClientKey().empty()) {
Logger::Log(LogLevel::Error,
"Please also provide tls-client-key");
return false;
}
// to enable mTLS, both tls_server_{certificate,key} must be
// supplied
if (ServerCert().empty() && not(ServerKey().empty())) {
Logger::Log(LogLevel::Error,
"Please also provide tls-server-cert");
return false;
}
if (not(ServerCert().empty()) && ServerKey().empty()) {
Logger::Log(LogLevel::Error,
"Please also provide tls-server-key");
return false;
}
return true;
}
private:
std::string ca_cert_;
std::string client_cert_;
std::string client_key_;
std::string server_cert_;
std::string server_key_;
// auxiliary function to set the content of the members of this class
[[nodiscard]] static auto set(
std::filesystem::path const& x,
gsl::not_null<std::string*> const& member) noexcept -> bool {
Auth::SetAuthMethod(AuthMethod::kTLS);
try {
// if the file does not exist, it will throw an exception
auto file = std::filesystem::canonical(x);
std::ifstream cert{file};
std::string tmp((std::istreambuf_iterator<char>(cert)),
std::istreambuf_iterator<char>());
*member = std::move(tmp);
} catch (std::exception const& e) {
Logger::Log(LogLevel::Error, e.what());
return false;
}
return true;
}
};
private:
AuthMethod auth_{AuthMethod::kNONE};
};
#endif
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