/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2013, 2017-2018, 2020-2021 Sadie Powell <sadie@witchery.services>
 *   Copyright (C) 2012-2013 Attila Molnar <attilamolnar@hush.com>
 *   Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
 *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
 *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2004, 2006 Craig Edwards <brain@inspircd.org>
 *
 * This file is part of InspIRCd.  InspIRCd 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, version 2.
 *
 * 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 <http://www.gnu.org/licenses/>.
 */


#include "inspircd.h"

/** Handle /SETHOST
 */
class CommandSethost : public Command
{
 public:
	std::bitset<UCHAR_MAX + 1> hostmap;

	CommandSethost(Module* Creator)
		: Command(Creator,"SETHOST", 1)
	{
		allow_empty_last_param = false;
		flags_needed = 'o';
		syntax = "<host>";
	}

	CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
	{
		if (parameters[0].length() > ServerInstance->Config->Limits.MaxHost)
		{
			user->WriteNotice("*** SETHOST: Host too long");
			return CMD_FAILURE;
		}

		for (std::string::const_iterator x = parameters[0].begin(); x != parameters[0].end(); x++)
		{
			if (!hostmap.test(static_cast<unsigned char>(*x)))
			{
				user->WriteNotice("*** SETHOST: Invalid characters in hostname");
				return CMD_FAILURE;
			}
		}

		if (user->ChangeDisplayedHost(parameters[0]))
		{
			ServerInstance->SNO->WriteGlobalSno('a', user->nick+" used SETHOST to change their displayed host to "+user->GetDisplayedHost());
			return CMD_SUCCESS;
		}

		return CMD_FAILURE;
	}
};


class ModuleSetHost : public Module
{
	CommandSethost cmd;

 public:
	ModuleSetHost()
		: cmd(this)
	{
	}

	void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
	{
		ConfigTag* tag = ServerInstance->Config->ConfValue("hostname");
		const std::string hmap = tag->getString("charmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.-_/0123456789", 1);

		cmd.hostmap.reset();
		for (std::string::const_iterator n = hmap.begin(); n != hmap.end(); n++)
			cmd.hostmap.set(static_cast<unsigned char>(*n));
	}

	Version GetVersion() CXX11_OVERRIDE
	{
		return Version("Adds the /SETHOST command which allows server operators to change their displayed hostname.", VF_VENDOR);
	}
};

MODULE_INIT(ModuleSetHost)
