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/*
* Copyright (c) 2023 Attila Szakacs
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#ifndef GOOGLE_AUTH_HPP
#define GOOGLE_AUTH_HPP
#include "google-auth.h"
#include "cloud-auth.hpp"
#include <mutex>
#include <string>
#include <jwt-cpp/jwt.h>
#include <picojson/picojson.h>
#include "compat/curl.h"
namespace syslogng {
namespace cloud_auth {
namespace google {
class ServiceAccountAuthenticator: public syslogng::cloud_auth::Authenticator
{
public:
ServiceAccountAuthenticator(const char *key_path, const char *audience, uint64_t token_validity_duration);
~ServiceAccountAuthenticator() {};
void handle_http_header_request(HttpHeaderRequestSignalData *data);
private:
std::string audience;
std::string email;
std::string private_key;
std::string private_key_id;
uint64_t token_validity_duration;
};
class UserManagedServiceAccountAuthenticator: public syslogng::cloud_auth::Authenticator
{
public:
UserManagedServiceAccountAuthenticator(const char *name, const char *metadata_url);
~UserManagedServiceAccountAuthenticator();
void handle_http_header_request(HttpHeaderRequestSignalData *data);
private:
static void add_token_to_headers(HttpHeaderRequestSignalData *data, const std::string &token);
static size_t curl_write_callback(void *contents, size_t size, size_t nmemb, void *userp);
bool send_token_get_request(std::string &response_payload_buffer);
bool parse_token_and_expiry_from_response(const std::string &response_payload, std::string &token, long *expiry);
private:
std::string name;
std::string auth_url;
struct curl_slist *curl_headers;
std::mutex lock;
std::string cached_token;
std::chrono::system_clock::time_point refresh_token_after;
};
}
}
}
#endif
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