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/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2019 Sadie Powell <sadie@witchery.services>
 *
 * 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"
#include "modules/geolocation.h"
#include "modules/stats.h"

enum
{
	// InspIRCd-specific.
	RPL_STATSCOUNTRY = 801
};

class ModuleGeoClass
	: public Module
	, public Stats::EventListener
{
 private:
	Geolocation::API geoapi;

 public:
	ModuleGeoClass()
		: Stats::EventListener(this)
		, geoapi(this)
	{
	}

	Version GetVersion() CXX11_OVERRIDE
	{
		return Version("Allows the server administrator to assign users to connect classes by the country they are connecting from.", VF_VENDOR);
	}

	ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) CXX11_OVERRIDE
	{
		const std::string country = myclass->config->getString("country");
		if (country.empty())
			return MOD_RES_PASSTHRU;

		// If we can't find the location of this user then we can't assign
		// them to a location-specific connect class.
		Geolocation::Location* location = geoapi ? geoapi->GetLocation(user) : NULL;
		const std::string code = location ? location->GetCode() : "XX";

		irc::spacesepstream codes(country);
		for (std::string token; codes.GetToken(token); )
		{
			// If the user matches this country code then they can use this
			// connect class.
			if (stdalgo::string::equalsci(token, code))
				return MOD_RES_PASSTHRU;
		}

		// A list of country codes were specified but the user didn't match
		// any of them.
		return MOD_RES_DENY;
	}

	ModResult OnStats(Stats::Context& stats) CXX11_OVERRIDE
	{
		if (stats.GetSymbol() != 'G')
			return MOD_RES_PASSTHRU;

		// Counter for the number of users in each country.
		typedef std::map<Geolocation::Location*, size_t> CountryCounts;
		CountryCounts counts;

		// Counter for the number of users in an unknown country.
		size_t unknown = 0;

		const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
		for (UserManager::LocalList::const_iterator iter = list.begin(); iter != list.end(); ++iter)
		{
			Geolocation::Location* location = geoapi ? geoapi->GetLocation(*iter) : NULL;
			if (location)
				counts[location]++;
			else
				unknown++;
		}

		for (CountryCounts::const_iterator iter = counts.begin(); iter != counts.end(); ++iter)
		{
			Geolocation::Location* location = iter->first;
			stats.AddRow(RPL_STATSCOUNTRY, iter->second, location->GetCode(), location->GetName());
		}

		if (unknown)
			stats.AddRow(RPL_STATSCOUNTRY, unknown, "*", "Unknown Country");

		return MOD_RES_DENY;
	}
};

MODULE_INIT(ModuleGeoClass)