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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2018 nerzhul, Loic BLOT <loic.blot@unix-experience.fr>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "ban.h"
#include <fstream>
#include "threading/mutex_auto_lock.h"
#include <sstream>
#include <set>
#include "util/strfnd.h"
#include "util/string.h"
#include "log.h"
#include "filesys.h"

BanManager::BanManager(const std::string &banfilepath):
		m_banfilepath(banfilepath)
{
	try {
		load();
	} catch(SerializationError &e) {
		infostream << "BanManager: creating "
				<< m_banfilepath << std::endl;
	}
}

BanManager::~BanManager()
{
	save();
}

void BanManager::load()
{
	MutexAutoLock lock(m_mutex);
	infostream<<"BanManager: loading from "<<m_banfilepath<<std::endl;
	std::ifstream is(m_banfilepath.c_str(), std::ios::binary);
	if (!is.good()) {
		infostream<<"BanManager: failed loading from "<<m_banfilepath<<std::endl;
		throw SerializationError("BanManager::load(): Couldn't open file");
	}

	while (!is.eof() && is.good()) {
		std::string line;
		std::getline(is, line, '\n');
		Strfnd f(line);
		std::string ip = trim(f.next("|"));
		std::string name = trim(f.next("|"));
		if(!ip.empty()) {
			m_ips[ip] = name;
		}
	}
	m_modified = false;
}

void BanManager::save()
{
	MutexAutoLock lock(m_mutex);
	infostream << "BanManager: saving to " << m_banfilepath << std::endl;
	std::ostringstream ss(std::ios_base::binary);

	for (const auto &ip : m_ips)
		ss << ip.first << "|" << ip.second << "\n";

	if (!fs::safeWriteToFile(m_banfilepath, ss.str())) {
		infostream << "BanManager: failed saving to " << m_banfilepath << std::endl;
		throw SerializationError("BanManager::save(): Couldn't write file");
	}

	m_modified = false;
}

bool BanManager::isIpBanned(const std::string &ip)
{
	MutexAutoLock lock(m_mutex);
	return m_ips.find(ip) != m_ips.end();
}

std::string BanManager::getBanDescription(const std::string &ip_or_name)
{
	MutexAutoLock lock(m_mutex);
	std::string s;
	for (const auto &ip : m_ips) {
		if (ip.first  == ip_or_name || ip.second == ip_or_name
				|| ip_or_name.empty()) {
			s += ip.first + "|" + ip.second + ", ";
		}
	}
	s = s.substr(0, s.size() - 2);
	return s;
}

std::string BanManager::getBanName(const std::string &ip)
{
	MutexAutoLock lock(m_mutex);
	StringMap::iterator it = m_ips.find(ip);
	if (it == m_ips.end())
		return "";
	return it->second;
}