//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2012-2020 OpenVPN Inc.
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU Affero General Public License Version 3
//    as published by the Free Software Foundation.
//
//    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 Affero General Public License for more details.
//
//    You should have received a copy of the GNU Affero General Public License
//    along with this program in the COPYING file.
//    If not, see <http://www.gnu.org/licenses/>.

#ifndef OPENVPN_PROXY_PROXYAUTH_H
#define OPENVPN_PROXY_PROXYAUTH_H

#include <vector>

#include <openvpn/common/rc.hpp>
#include <openvpn/common/split.hpp>
#include <openvpn/http/header.hpp>

namespace openvpn {
  namespace HTTPProxy {

    // parse the Proxy-Authenticate HTTP header
    class ProxyAuthenticate : public RC<thread_unsafe_refcount> {
    public:
      typedef RCPtr<ProxyAuthenticate> Ptr;

      ProxyAuthenticate() {}

      ProxyAuthenticate(const std::string& line)
      {
	do_parse(line);
      }

      void parse(const std::string& line)
      {
	method = "";
	parms.clear();
	do_parse(line);
      }

      std::string to_string() const
      {
	std::ostringstream out;
	out << "Proxy-Authenticate header" << std::endl;
	out << "method=" << method << std::endl;
	out << parms.to_string();
	return out.str();
      }

      std::string method;
      HTTP::HeaderList parms;

    private:
      void do_parse(const std::string& line)
      {
	std::vector<std::string> tuple = Split::by_char<std::vector<std::string>, StandardLex, Split::NullLimit>(line, ' ', 0, 1);
	if (tuple.size() >= 1)
	  method = tuple[0];
	if (tuple.size() == 2)
	  {
	    std::vector<std::string> list = Split::by_char<std::vector<std::string>, StandardLex, Split::NullLimit>(tuple[1], ',', Split::TRIM_LEADING_SPACES|Split::TRIM_SPECIAL);
	    for (std::vector<std::string>::const_iterator i = list.begin(); i != list.end(); ++i)
	      {
		std::vector<std::string> pair = Split::by_char<std::vector<std::string>, StandardLex, Split::NullLimit>(*i, '=', 0, 1);
		if (pair.size() == 2)
		  parms.push_back(HTTP::Header(pair[0], pair[1]));
	      }
	  }
      }
    };
  }
}

#endif