/*

Copyright (c) 2009-2010, 2013-2014, 2017, 2019, Arvid Norberg

Copyright (c) 2016, 2018, Alden Torres

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

    * Redistributions of source code must retain the above copyright

      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright

      notice, this list of conditions and the following disclaimer in

      the documentation and/or other materials provided with the distribution.

    * Neither the name of the author nor the names of its

      contributors may be used to endorse or promote products derived

      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

*/

#include <string>

#include "libtorrent/error_code.hpp"

#include "libtorrent/socket.hpp"

#include "libtorrent/socket_io.hpp"

#include "libtorrent/address.hpp"

#include "libtorrent/io.hpp" // for write_uint16

#include "libtorrent/hasher.hpp" // for hasher

#include "libtorrent/aux_/escape_string.hpp" // for trim

namespace libtorrent {

  std::string print_address(address const& addr)

  {

    return addr.to_string();

  }

  std::string address_to_bytes(address const& a)

  {

    std::string ret;

    std::back_insert_iterator<std::string> out(ret);

    aux::write_address(a, out);

    return ret;

  }

  std::string endpoint_to_bytes(udp::endpoint const& ep)

  {

    std::string ret;

    std::back_insert_iterator<std::string> out(ret);

    aux::write_endpoint(ep, out);

    return ret;

  }

  std::string print_endpoint(address const& addr, int port)

  {

    char buf[200];

    if (addr.is_v6())

      std::snprintf(buf, sizeof(buf), "[%s]:%d", addr.to_string().c_str(), port);

    else

      std::snprintf(buf, sizeof(buf), "%s:%d", addr.to_string().c_str(), port);

    return buf;

  }

  std::string print_endpoint(tcp::endpoint const& ep)

  {

    return print_endpoint(ep.address(), ep.port());

  }

  std::string print_endpoint(udp::endpoint const& ep)

  {

    return print_endpoint(ep.address(), ep.port());

  }

  tcp::endpoint parse_endpoint(string_view str, error_code& ec)

  {

    tcp::endpoint ret;

    str = trim(str);

    string_view addr;

    string_view port;

    if (str.empty())

    {

      ec = errors::invalid_port;

      return ret;

    }

    // this is for IPv6 addresses

    if (str.front() == '[')

    {

      auto const close_bracket = str.find_first_of(']');

      if (close_bracket == string_view::npos)

      {

        ec = errors::expected_close_bracket_in_address;

        return ret;

      }

      addr = str.substr(1, close_bracket - 1);

      port = str.substr(close_bracket + 1);

      if (port.empty() || port.front() != ':')

      {

        ec = errors::invalid_port;

        return ret;

      }

      // shave off the ':'

      port = port.substr(1);

      ret.address(make_address_v6(addr.to_string(), ec));

      if (ec) return ret;

    }

    else

    {

      auto const port_pos = str.find_first_of(':');

      if (port_pos == string_view::npos)

      {

        ec = errors::invalid_port;

        return ret;

      }

      addr = str.substr(0, port_pos);

      port = str.substr(port_pos + 1);

      ret.address(make_address_v4(addr.to_string(), ec));

      if (ec) return ret;

    }

    if (port.empty())

    {

      ec = errors::invalid_port;

      return ret;

    }

    int const port_num = std::atoi(port.to_string().c_str());

    if (port_num <= 0 || port_num > std::numeric_limits<std::uint16_t>::max())

    {

      ec = errors::invalid_port;

      return ret;

    }

    ret.port(static_cast<std::uint16_t>(port_num));

    return ret;

  }

  sha1_hash hash_address(address const& ip)

  {

    if (ip.is_v6())

    {

      address_v6::bytes_type b = ip.to_v6().to_bytes();

      return hasher(reinterpret_cast<char const*>(b.data()), int(b.size())).final();

    }

    else

    {

      address_v4::bytes_type b = ip.to_v4().to_bytes();

      return hasher(reinterpret_cast<char const*>(b.data()), int(b.size())).final();

    }

  }

}