First commit.

1 files changed, 271 insertions, 0 deletions

diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..ef6143e
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,271 @@
+
+xban = { }
+
+local MP = minetest.get_modpath(minetest.get_current_modname())
+
+dofile(MP.."/serialize.lua")
+dofile(MP.."/shutil.lua")
+
+local db = { }
+local tempbans = { }
+
+local DEF_SAVE_INTERVAL = 300 -- 5 minutes
+local DEF_DB_FILENAME = minetest.get_worldpath().."/xban.db"
+
+local DB_FILENAME = minetest.setting_get("xban.db_filename")
+local SAVE_INTERVAL = tonumber(
+  minetest.setting_get("xban.db_save_interval")) or DEF_SAVE_INTERVAL
+
+if (not DB_FILENAME) or (DB_FILENAME == "") then
+	DB_FILENAME = DEF_DB_FILENAME
+end
+
+local function make_logger(level)
+	return function(text, ...)
+		minetest.log(level, "[xban] "..text:format(...))
+	end
+end
+
+local ACTION = make_logger("action")
+local INFO = make_logger("info")
+local WARNING = make_logger("warning")
+local ERROR = make_logger("error")
+
+local unit_to_secs = {
+	s = 1, m = 60, h = 3600,
+	D = 86400, W = 604800, M = 2592000, Y = 31104000,
+	[""] = 1,
+}
+
+local function parse_time(t) --> secs
+	local secs = 0
+	for num, unit in t:gmatch("(%d+)([smhDWMY]?)") do
+		secs = secs + (tonumber(num) * (unit_to_secs[unit] or 1))
+	end
+	return secs
+end
+
+function xban.find_entry(player, create) --> entry, index
+	for index, e in ipairs(db) do
+		for name in pairs(e.names) do
+			if name == player then
+				return e, index
+			end
+		end
+	end
+	if create then
+		local e = {
+			names = { [player]=true },
+			banned = false,
+			record = { },
+		}
+		table.insert(db, e)
+		return e, #db
+	end
+	return nil
+end
+
+function xban.get_info(player) --> ip_name_list, banned, last_record
+	local e = xban.find_entry(player)
+	if not e then
+		return nil, "No such entry"
+	end
+	return e.names, e.banned, e.record[#e.record]
+end
+
+function xban.ban_player(player, source, expires, reason) --> bool, err
+	local e = xban.find_entry(player, true)
+	local rec = {
+		source = source,
+		time = os.time(),
+		expires = expires,
+		reason = reason,
+	}
+	table.insert(e.record, rec)
+	e.names[player] = true
+	local pl = minetest.get_player_by_name(player)
+	if pl then
+		local ip = minetest.get_player_ip(player)
+		if ip then
+			e.names[ip] = true
+		end
+	end
+	e.reason = reason
+	e.time = rec.time
+	e.expires = expires
+	e.banned = true
+	local msg
+	local date = (expires and os.date("%c", expires)
+	  or "the end of time")
+	if expires then
+		table.insert(tempbans, e)
+		msg = ("Banned: Expires: %s, Reason: %s"):format(date, reason)
+	else
+		msg = ("Banned: Reason: %s"):format(reason)
+	end
+	for nm in pairs(e.names) do
+		minetest.kick_player(nm, msg)
+	end
+	ACTION("%s bans %s until %s for reason: %s", source, player,
+	  date, reason)
+	ACTION("Banned Names/IPs: %s", table.concat(e.names, ", "))
+	return true
+end
+
+function xban.unban_player(player, source) --> bool, err
+	local e = xban.find_entry(player)
+	if not e then
+		return nil, "No such entry"
+	end
+	local rec = {
+		source = source,
+		time = os.time(),
+		reason = "Unbanned",
+	}
+	table.insert(e.record, rec)
+	e.banned = false
+	e.reason = nil
+	e.expires = nil
+	e.time = nil
+	ACTION("%s unbans %s", source, player)
+	ACTION("Unbanned Names/IPs: %s", table.concat(e.names, ", "))
+	return true
+end
+
+minetest.register_on_prejoinplayer(function(name, ip)
+	local e = xban.find_entry(name) or xban.find_entry(ip, true)
+	e.names[name] = true
+	e.names[ip] = true
+	if e.banned then
+		local date = (e.expires and os.date("%c", e.expires)
+		  or "the end of time")
+		return ("Banned: Expires: %s, Reason: %s"):format(
+		  date, e.reason)
+	end
+end)
+
+minetest.register_chatcommand("xban", {
+	description = "XBan a player",
+	params = "<player> <reason>",
+	privs = { ban=true },
+	func = function(name, params)
+		local plname, reason = params:match("(%S+)%s+(.+)")
+		if not (plname and reason) then
+			minetest.chat_send_player(name,
+			  "Usage: /xban <player> <reason>")
+			return
+		end
+		xban.ban_player(plname, name, nil, reason)
+		minetest.chat_send_player(name,
+		  ("Banned %s."):format(plname))
+	end,
+})
+
+minetest.register_chatcommand("xtempban", {
+	description = "XBan a player temporarily",
+	params = "<player> <time> <reason>",
+	privs = { ban=true },
+	func = function(name, params)
+		local plname, time, reason = params:match("(%S+)%s+(%S+)%s+(.+)")
+		if not (plname and time and reason) then
+			minetest.chat_send_player(name,
+			  "Usage: /xtempban <player> <time> <reason>")
+			return
+		end
+		time = parse_time(time)
+		if time < 60 then
+			minetest.chat_send_player(name,
+			  "You must ban for at least 60 seconds.")
+			return
+		end
+		local expires = os.time() + time
+		xban.ban_player(plname, name, expires, reason)
+		minetest.chat_send_player(name,
+		  ("Banned %s until %s."):format(
+		  plname, os.date("%c", expires)))
+	end,
+})
+
+minetest.register_chatcommand("xunban", {
+	description = "XUnBan a player",
+	params = "<player_or_ip>",
+	privs = { ban=true },
+	func = function(name, params)
+		local plname = params:match("%S+")
+		if not plname then
+			minetest.chat_send_player(name,
+			  "Usage: /xunban <player_or_ip>")
+			return
+		end
+		local ok, e = xban.unban_player(plname, name)
+		minetest.chat_send_player(name,
+		  ("Unbanned %s."):format(plname))
+	end,
+})
+
+local function check_temp_bans()
+	minetest.after(60, check_temp_bans)
+	local to_rm = { }
+	local now = os.time()
+	for i, e in ipairs(tempbans) do
+		if e.expires and (e.expires <= now) then
+			table.insert(to_rm, i)
+			e.banned = false
+			e.expires = nil
+			e.reason = nil
+			e.time = nil
+		end
+	end
+	for _, i in ipairs(to_rm) do
+		table.remove(tempbans, i)
+	end
+end
+
+local function save_db()
+	minetest.after(SAVE_INTERVAL, save_db)
+	local ok
+	local f, e = io.open(DB_FILENAME, "wt")
+	db.timestamp = os.time()
+	if f then
+		ok, e = f:write(xban.serialize(db))
+		WARNING("Unable to save database: %s", e)
+	end
+	if f then f:close() end
+	return
+end
+
+local function load_db()
+	local f, e = io.open(DB_FILENAME, "rt")
+	if not f then
+		WARNING("Unable to load database: %s", e)
+		return
+	end
+	local cont
+	cont, e = f:read("*a")
+	if not cont then
+		WARNING("Unable to load database: %s", e)
+		return
+	end
+	local t = minetest.deserialize(cont)
+	if not t then
+		WARNING("Unable to load database: %s",
+		  "Deserialization failed")
+		return
+	end
+	db = t
+	tempbans = { }
+	for _, entry in ipairs(db) do
+		if entry.banned and entry.expires then
+			table.insert(tempbans, entry)
+		end
+	end
+end
+
+-- Backup database
+shutil.copy_file(DB_FILENAME,
+  DB_FILENAME.."."..os.date("%Y%m%d%H%M%S"))
+
+minetest.register_on_shutdown(save_db)
+minetest.after(SAVE_INTERVAL, save_db)
+load_db()
+xban.db = db