//    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/>.

// Wrap a mbed TLS x509_crl object

#ifndef OPENVPN_MBEDTLS_PKI_X509CRL_H
#define OPENVPN_MBEDTLS_PKI_X509CRL_H

#include <string>
#include <sstream>
#include <cstring>

#include <mbedtls/x509_crl.h>

#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/rc.hpp>
#include <openvpn/mbedtls/util/error.hpp>

namespace openvpn {
  namespace MbedTLSPKI {

    class X509CRL : public RC<thread_unsafe_refcount>
    {
    public:
      typedef RCPtr<X509CRL> Ptr;

      X509CRL() : chain(nullptr) {}

      X509CRL(const std::string& crl_txt)
	: chain(nullptr)
      {
	try {
	  parse(crl_txt);
	}
	catch (...)
	  {
	    dealloc();
	    throw;
	  }
      }

      void parse(const std::string& crl_txt)
      {
	alloc();

	// crl_txt.length() is increased by 1 as it does not include the NULL-terminator
	// which mbedtls_x509_crl_parse() expects to see.
	const int status = mbedtls_x509_crl_parse(chain,
						  (const unsigned char *)crl_txt.c_str(),
						  crl_txt.length() + 1);
	if (status < 0)
	  {
	    throw MbedTLSException("error parsing CRL", status);
	  }

	pem_chain = crl_txt;
      }

      std::string extract() const
      {
	return std::string(pem_chain);
      }

      mbedtls_x509_crl* get() const
      {
	return chain;
      }

      ~X509CRL()
      {
	dealloc();
      }

    private:
      void alloc()
      {
	if (!chain)
	  {
	    chain = new mbedtls_x509_crl;
	    std::memset(chain, 0, sizeof(mbedtls_x509_crl));
	  }
      }

      void dealloc()
      {
	if (chain)
	  {
	    mbedtls_x509_crl_free(chain);
	    delete chain;
	    chain = nullptr;
	  }
      }

      mbedtls_x509_crl *chain;
      std::string pem_chain;
    };
  }
}

#endif