http.cpp

/*
 *  Copyright (C) 2014-2022 Savoir-faire Linux Inc.
 *  Author: Vsevolod Ivanov <vsevolod.ivanov@savoirfairelinux.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, 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, see <https://www.gnu.org/licenses/>.
 */

#include "http.h"
#include "log_enable.h"
#include "crypto.h"
#include "base64.h"
#include "compat/os_cert.h"

#include <asio.hpp>
#include <restinio/impl/tls_socket.hpp>
#include <http_parser.h>
#include <json/json.h>

#include <openssl/ocsp.h>
#include <openssl/ssl.h>
#include <openssl/asn1.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>

#define MAXAGE_SEC (14*24*60*60)
#define JITTER_SEC (60)
#define OCSP_MAX_RESPONSE_SIZE (20480)
#ifdef _WIN32
#define timegm                 _mkgmtime
#endif

namespace dht {
namespace http {

constexpr const char HTTP_HEADER_CONTENT_TYPE_JSON[] = "application/json";
constexpr const char HTTP_HEADER_DELIM[] = "\r\n\r\n";
constexpr const char HTTP_PROTOCOL[] = "http://";
constexpr const char HTTPS_PROTOCOL[] = "https://";
constexpr const char ORIGIN_PROTOCOL[] = "//";
constexpr unsigned MAX_REDIRECTS {5};

Url::Url(const std::string& url): url(url)
{
    size_t addr_begin = 0;
    // protocol
    const size_t proto_end = url.find("://");
    if (proto_end != std::string::npos){
        addr_begin = proto_end + 3;
        if (url.substr(0, proto_end) == "https"){
            protocol = "https";
        }
    }
    // host and service
    size_t addr_size = url.substr(addr_begin).find("/");
    if (addr_size == std::string::npos)
        addr_size = url.size() - addr_begin;
    auto host_service = splitPort(url.substr(addr_begin, addr_size));
    host = host_service.first;
    if (!host_service.second.empty())