[irc] add irc mod

minetest.conf

@@ -38,9 +38,9 @@ enable_sprinting = true
 #################IRC################
 #
 irc.server = chat.freenode.net
-irc.channel = #UGXmortalrealms
-irc.nick = UGXMR-bot
-irc.password = 
+irc.channel = #UGX-mortalrealms
+irc.nick = UGXMR-Bot
+#irc.password = 
 #
 ###############Areas################
 #

worldmods/irc/.gitignore

@@ -0,0 +1,2 @@
+*~
+

worldmods/irc/.gitmodules

@@ -0,0 +1,3 @@
+[submodule "src/LuaIRC"]
+	path = irc
+	url = https://github.com/ShadowNinja/LuaIRC.git

worldmods/irc/.luacheckrc

@@ -0,0 +1,14 @@
+
+allow_defined_top = true
+
+read_globals = {
+	"minetest",
+}
+
+exclude_files = {
+	"irc/*",
+}
+
+globals = {
+	"irc",
+}

worldmods/irc/API.md

@@ -0,0 +1,90 @@
+IRC Mod API
+===========
+
+This file documents the Minetest IRC mod API.
+
+Basics
+------
+
+In order to allow your mod to interface with this mod, you must add `irc`
+to your mod's `depends.txt` file.
+
+
+Reference
+---------
+
+irc.say([name,] message)
+Sends <message> to either the channel (if <name> is nil or not specified),
+or to the given user (if <name> is specified).
+Example:
+	irc.say("Hello, Channel!")
+	irc.say("john1234", "How are you?")
+
+irc.register_bot_command(name, cmdDef)
+	Registers a new bot command named <name>.
+	When an user sends a private message to the bot with the command name, the
+	command's function is called.
+	Here's the format of a command definition (<cmdDef>):
+		cmdDef = {
+			params = "<param1> ...",      -- A description of the command's parameters
+			description = "My command",   -- A description of what the command does. (one-liner)
+			func = function(user, args)
+				-- This function gets called when the command is invoked.
+				-- <user> is a user table for the user that ran the command.
+				--   (See the LuaIRC documentation for details.)
+				--   It contains fields such as 'nick' and 'ident'
+				-- <args> is a string of arguments to the command (may be "")
+				-- This function should return boolean success and a message.
+			end,
+		};
+	Example:
+		irc.register_bot_command("hello", {
+			params = "",
+			description = "Greet user",
+			func = function(user, param)
+				return true, "Hello!"
+			end,
+		});
+
+irc.joined_players[name]
+	This table holds the players who are currently on the channel (may be less
+	than the players in the game). It is modified by the /part and /join chat
+	commands.
+	Example:
+	if irc.joined_players["joe"] then
+		-- Joe is talking on IRC
+	end
+
+irc.register_hook(name, func)
+	Registers a function to be called when an event happens. <name> is the name
+	of the event, and <func> is the function to be called. See HOOKS below
+	for more information
+	Example:
+	irc.register_hook("OnSend", function(line)
+		print("SEND: "..line)
+	end)
+
+This mod also supplies some utility functions:
+
+string.expandvars(string, vars)
+	Expands all occurrences of the pattern "$(varname)" with the value of
+	'varname' in the <vars> table. Variable names not found on the table
+	are left verbatim in the string.
+	Example:
+	local tpl = "$(foo) $(bar) $(baz)"
+	local s = tpl:expandvars({foo=1, bar="Hello"})
+	assert(s == "1 Hello $(baz)") 
+
+In addition, all the configuration options decribed in `README.txt` are
+available to other mods, though they should be considered read-only. Do
+not modify these settings at runtime or you might crash the server!
+
+
+Hooks
+-----
+
+The `irc.register_hook` function can register functions to be called
+when some events happen. The events supported are the same as the LuaIRC
+ones with a few added (mostly for internal use).
+See src/LuaIRC/doc/irc.luadoc for more information.
+

worldmods/irc/README.md

@@ -0,0 +1,181 @@
+
+IRC Mod for Minetest
+====================
+
+Introduction
+------------
+
+This mod is just a glue between IRC and Minetest. It provides two-way
+ communication between the in-game chat, and an arbitrary IRC channel.
+
+The forum topic is [here][forum].
+
+[forum]: https://forum.minetest.net/viewtopic.php?f=11&t=3905
+
+
+Installing
+----------
+
+Quick one line install for Linux:
+
+	cd <Mods directory> && git clone --recursive https://github.com/minetest-mods/irc.git
+
+Please change `<Mods directory>` to fit your installation of Minetest.
+For more information, see [the wiki][wiki].
+
+The IRC mod's git repository uses submodules, therefore you will have to run
+`git submodule init` when first installing the mod (unless you used
+`--recursive` as above), and `git submodule update` every time that a submodule
+is updated. These steps can be combined into `git submodule update --init`.
+
+You'll need to install LuaSocket. You can do so with your package manager on
+many distributions, for example:
+
+	# # On Arch Linux:
+	# pacman -S lua51-socket
+	# # On Debian/Ubuntu:
+	# # Debian/Ubuntu's LuaSocket packages are broken, so use LuaRocks.
+	# apt-get install luarocks
+	# luarocks install luasocket
+
+You will also need to add IRC to your trusted mods if you haven't disabled mod
+security. Here's an example configuration line:
+
+	secure.trusted_mods = irc
+
+[wiki]: https://wiki.minetest.net/Installing_mods
+
+
+Settings
+--------
+
+All settings are changed in `minetest.conf`. If any of these settings
+are not set, the default value is used.
+
+* `irc.server` (string):
+  The address of the IRC server to connect to.
+
+* `irc.channel` (string):
+  The IRC channel to join.
+
+* `irc.interval` (number, default 2.0):
+  This prevents the server from flooding. It should be at
+  least 2.0 but can be higher. After four messages this much
+  time must pass between folowing messages.
+
+* `irc.nick` (string):
+  Nickname the server uses when it connects to IRC.
+
+* `irc.password` (string, default nil):
+  Password to use when connecting to the server.
+
+* `irc.NSPass` (string, default nil):
+  NickServ password. Don't set this if you use SASL authentication.
+
+* `irc.sasl.pass` (string, default nil):
+  SASL password, same as nickserv password.
+  You should use this instead of NickServ authentication
+  if the server supports it.
+
+* `irc.sasl.user` (string, default `irc.nick`):
+  The SASL username. This should normaly be set to your
+  NickServ account name.
+
+* `irc.debug` (boolean, default false):
+  Whether to output debug information.
+
+* `irc.disable_auto_connect` (boolean, default false):
+  If false, the bot is connected by default. If true, a player with
+  the 'irc_admin' privilege has to use the `/irc_connect` command to
+  connect to the server.
+
+* `irc.disable_auto_join` (boolean, default false):
+  If false, players join the channel automatically upon entering the
+  game. If true, each user must manually use the `/join` command to
+  join the channel. In any case, the players may use the `/part`
+  command to opt-out of being in the channel.
+
+* `irc.send_join_part` (boolean, default true):
+  Determines whether to send player join and part messages to the channel.
+
+
+Usage
+-----
+
+Once the game is connected to the IRC channel, chatting in-game will send
+messages to the channel, and will be visible by anyone. Also, messages sent
+to the channel will be visible in-game.
+
+Messages that begin with `[off]` from in-game or IRC are not sent to the
+other side.
+
+This mod also adds a few chat commands:
+
+* `/irc_msg <nick> <message>`:
+  Send a private message to a IRC user.
+
+* `/join`:
+  Join the IRC chat.
+
+* `/part`:
+  Part the IRC chat.
+
+* `/irc_connect`:
+  Connect the bot manually to the IRC network.
+
+* `/irc_disconnect`:
+  Disconnect the bot manually from the IRC network (this does not
+  shutdown the game).
+
+* `/irc_reconnect`:
+  Equivalent to `/irc_disconnect` followed by `/irc_connect`.
+
+You can also send private messages from IRC to in-game players
+by sending a private message to the bot (set with the `irc.nick`
+option above), in the following format:
+
+	@playername message
+
+For example, if there's a player named `mtuser`, you can send him/her
+a private message from IRC with:
+
+	/msg server_nick @mtuser Hello!
+
+The bot also supports some basic commands, which are invoked by saying
+the bot name followed by either a colon or a comma and the command, or
+sending a private message to it. For example: `ServerBot: help whereis`.
+
+* `help [<command>]`:
+  Prints help about a command, or a list of supported commands if no
+  command is given.
+
+* `uptime`:
+  Prints the server's running time.
+
+* `whereis <player>`:
+  Prints the coordinates of the given player.
+
+* `players`:
+  Lists players currently in the server.
+
+
+Thanks
+------
+
+I'd like to thank the users who supported this mod both on the Minetest
+Forums and on the `#minetest` channel. In no particular order:
+
+0gb.us, ShadowNinja, Shaun/kizeren, RAPHAEL, DARGON, Calinou, Exio,
+vortexlabs/mrtux, marveidemanis, marktraceur, jmf/john\_minetest,
+sdzen/Muadtralk, VanessaE, PilzAdam, sfan5, celeron55, KikaRz,
+OldCoder, RealBadAngel, and all the people who commented in the
+forum topic. Thanks to you all!
+
+
+License
+-------
+
+See `LICENSE.txt` for details.
+
+The files in the `irc` directory are part of the LuaIRC project.
+See `irc/LICENSE.txt` for details.

worldmods/irc/botcmds.lua

@@ -0,0 +1,175 @@
+
+irc.bot_commands = {}
+
+-- From RFC1459:
+-- "Because of IRC’s scandanavian origin, the characters {}| are
+--  considered to be the lower case equivalents of the characters
+--  []\, respectively."
+local irctolower = { ["["]="{", ["\\"]="|", ["]"]="}" }
+
+local function irclower(s)
+	return (s:lower():gsub("[%[%]\\]", irctolower))
+end
+
+local function nickequals(nick1, nick2)
+	return irclower(nick1) == irclower(nick2)
+end
+
+function irc.check_botcmd(msg)
+	local prefix = irc.config.command_prefix
+	local nick = irc.conn.nick
+	local text = msg.args[2]
+	local nickpart = text:sub(1, #nick)
+	local suffix = text:sub(#nick+1, #nick+2)
+
+	-- First check for a nick prefix
+	if nickequals(nickpart, nick)
+			and (suffix == ": " or suffix == ", ") then
+		irc.bot_command(msg, text:sub(#nick + 3))
+		return true
+	-- Then check for the configured prefix
+	elseif prefix and text:sub(1, #prefix):lower() == prefix:lower() then
+		irc.bot_command(msg, text:sub(#prefix + 1))
+		return true
+	end
+	return false
+end
+
+
+function irc.bot_command(msg, text)
+	-- Remove leading whitespace
+	text = text:match("^%s*(.*)")
+	if text:sub(1, 1) == "@" then
+		local _, _, player_to, message = text:find("^.([^%s]+)%s(.+)$")
+		if not player_to then
+			return
+		elseif not minetest.get_player_by_name(player_to) then
+			irc.reply("User '"..player_to.."' is not in the game.")
+			return
+		elseif not irc.joined_players[player_to] then
+			irc.reply("User '"..player_to.."' is not using IRC.")
+			return
+		end
+		minetest.chat_send_player(player_to,
+				"PM from "..msg.user.nick.."@IRC: "..message, false)
+		irc.reply("Message sent!")
+		return
+	end
+	local pos = text:find(" ", 1, true)
+	local cmd, args
+	if pos then
+		cmd = text:sub(1, pos - 1)
+		args = text:sub(pos + 1)
+	else
+		cmd = text
+		args = ""
+	end
+
+	if not irc.bot_commands[cmd] then
+		irc.reply("Unknown command '"..cmd.."'. Try 'help'."
+			.." Or use @playername <message> to send a private message")
+		return
+	end
+
+	local _, message = irc.bot_commands[cmd].func(msg.user, args)
+	if message then
+		irc.reply(message)
+	end
+end
+
+
+function irc.register_bot_command(name, def)
+	if (not def.func) or (type(def.func) ~= "function") then
+		error("Erroneous bot command definition. def.func missing.", 2)
+	elseif name:sub(1, 1) == "@" then
+		error("Erroneous bot command name. Command name begins with '@'.", 2)
+	end
+	irc.bot_commands[name] = def
+end
+
+
+irc.register_bot_command("help", {
+	params = "<command>",
+	description = "Get help about a command",
+	func = function(_, args)
+		if args == "" then
+			local cmdlist = { }
+			for name in pairs(irc.bot_commands) do
+				cmdlist[#cmdlist+1] = name
+			end
+			return true, "Available commands: "..table.concat(cmdlist, ", ")
+					.." -- Use 'help <command name>' to get"
+					.." help about a specific command."
+		end
+
+		local cmd = irc.bot_commands[args]
+		if not cmd then
+			return false, "Unknown command '"..args.."'."
+		end
+
+		return true, ("Usage: %s%s %s -- %s"):format(
+				irc.config.command_prefix or "",
+				args,
+				cmd.params or "<no parameters>",
+				cmd.description or "<no description>")
+	end
+})
+
+
+irc.register_bot_command("list", {
+	params = "",
+	description = "List available commands.",
+	func = function()
+		return false, "The `list` command has been merged into `help`."
+				.." Use `help` with no arguments to get a list."
+	end
+})
+
+
+irc.register_bot_command("whereis", {
+	params = "<player>",
+	description = "Tell the location of <player>",
+	func = function(_, args)
+		if args == "" then
+			return false, "Player name required."
+		end
+		local player = minetest.get_player_by_name(args)
+		if not player then
+			return false, "There is no player named '"..args.."'"
+		end
+		local fmt = "Player %s is at (%.2f,%.2f,%.2f)"
+		local pos = player:getpos()
+		return true, fmt:format(args, pos.x, pos.y, pos.z)
+	end
+})
+
+
+local starttime = os.time()
+irc.register_bot_command("uptime", {
+	description = "Tell how much time the server has been up",
+	func = function()
+		local cur_time = os.time()
+		local diff = os.difftime(cur_time, starttime)
+		local fmt = "Server has been running for %d:%02d:%02d"
+		return true, fmt:format(
+			math.floor(diff / 60 / 60),
+			math.floor(diff / 60) % 60,
+			math.floor(diff) % 60
+		)
+	end
+})
+
+
+irc.register_bot_command("players", {
+	description = "List the players on the server",
+	func = function()
+		local players = minetest.get_connected_players()
+		local names = {}
+		for _, player in pairs(players) do
+			table.insert(names, player:get_player_name())
+		end
+		return true, "Connected players: "
+				..table.concat(names, ", ")
+	end
+})
+

worldmods/irc/callback.lua

@@ -0,0 +1,41 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+
+minetest.register_on_joinplayer(function(player)
+	local name = player:get_player_name()
+	if irc.connected and irc.config.send_join_part then
+		irc.say("*** "..name.." joined the game")
+	end
+end)
+
+
+minetest.register_on_leaveplayer(function(player, timed_out)
+	local name = player:get_player_name()
+	if irc.connected and irc.config.send_join_part then
+		irc.say("*** "..name.." left the game"..
+				(timed_out and " (Timed out)" or ""))
+	end
+end)
+
+
+minetest.register_on_chat_message(function(name, message)
+	if not irc.connected
+	   or message:sub(1, 1) == "/"
+	   or message:sub(1, 5) == "[off]"
+	   or not irc.joined_players[name]
+	   or (not minetest.check_player_privs(name, {shout=true})) then
+		return
+	end
+	local nl = message:find("\n", 1, true)
+	if nl then
+		message = message:sub(1, nl - 1)
+	end
+	irc.say(irc.playerMessage(name, core.strip_colors(message)))
+end)
+
+
+minetest.register_on_shutdown(function()
+	irc.disconnect("Game shutting down.")
+end)
+

worldmods/irc/chatcmds.lua

@@ -0,0 +1,134 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+-- Note: This file does NOT conatin every chat command, only general ones.
+-- Feature-specific commands (like /join) are in their own files.
+
+
+minetest.register_chatcommand("irc_msg", {
+	params = "<name> <message>",
+	description = "Send a private message to an IRC user",
+	privs = {shout=true},
+	func = function(name, param)
+		if not irc.connected then
+			return false, "Not connected to IRC. Use /irc_connect to connect."
+		end
+		local found, _, toname, message = param:find("^([^%s]+)%s(.+)")
+		if not found then
+			return false, "Invalid usage, see /help irc_msg."
+		end
+		local toname_l = toname:lower()
+		local validNick = false
+		local hint = "They have to be in the channel"
+		for nick in pairs(irc.conn.channels[irc.config.channel].users) do
+			if nick:lower() == toname_l then
+				validNick = true
+				break
+			end
+		end
+		if toname_l:find("serv$") or toname_l:find("bot$") then
+			hint = "it looks like a bot or service"
+			validNick = false
+		end
+		if not validNick then
+			return false, "You can not message that user. ("..hint..")"
+		end
+		irc.say(toname, irc.playerMessage(name, message))
+		return true, "Message sent!"
+	end
+})
+
+
+minetest.register_chatcommand("irc_names", {
+	params = "",
+	description = "List the users in IRC.",
+	func = function()
+		if not irc.connected then
+			return false, "Not connected to IRC. Use /irc_connect to connect."
+		end
+		local users = { }
+		for nick in pairs(irc.conn.channels[irc.config.channel].users) do
+			table.insert(users, nick)
+		end
+		return true, "Users in IRC: "..table.concat(users, ", ")
+	end
+})
+
+
+minetest.register_chatcommand("irc_connect", {
+	description = "Connect to the IRC server.",
+	privs = {irc_admin=true},
+	func = function(name)
+		if irc.connected then
+			return false, "You are already connected to IRC."
+		end
+		minetest.chat_send_player(name, "IRC: Connecting...")
+		irc.connect()
+	end
+})
+
+
+minetest.register_chatcommand("irc_disconnect", {
+	params = "[message]",
+	description = "Disconnect from the IRC server.",
+	privs = {irc_admin=true},
+	func = function(name, param)
+		if not irc.connected then
+			return false, "Not connected to IRC. Use /irc_connect to connect."
+		end
+		if param == "" then
+			param = "Manual disconnect by "..name
+		end
+		irc.disconnect(param)
+	end
+})
+
+
+minetest.register_chatcommand("irc_reconnect", {
+	description = "Reconnect to the IRC server.",
+	privs = {irc_admin=true},
+	func = function(name)
+		if not irc.connected then
+			return false, "Not connected to IRC. Use /irc_connect to connect."
+		end
+		minetest.chat_send_player(name, "IRC: Reconnecting...")
+		irc.disconnect("Reconnecting...")
+		irc.connect()
+	end
+})
+
+
+minetest.register_chatcommand("irc_quote", {
+	params = "<command>",
+	description = "Send a raw command to the IRC server.",
+	privs = {irc_admin=true},
+	func = function(name, param)
+		if not irc.connected then
+			return false, "Not connected to IRC. Use /irc_connect to connect."
+		end
+		irc.queue(param)
+		minetest.chat_send_player(name, "Command sent!")
+	end
+})
+
+
+local oldme = minetest.chatcommands["me"].func
+-- luacheck: ignore
+minetest.chatcommands["me"].func = function(name, param, ...)
+	irc.say(("* %s %s"):format(name, param))
+	return oldme(name, param, ...)
+end
+
+if irc.config.send_kicks and minetest.chatcommands["kick"] then
+	local oldkick = minetest.chatcommands["kick"].func
+	-- luacheck: ignore
+	minetest.chatcommands["kick"].func = function(name, param, ...)
+		local plname, reason = param:match("^(%S+)%s*(.*)$")
+		if not plname then
+			return false, "Usage: /kick player [reason]"
+		end
+		irc.say(("*** Kicked %s.%s"):format(name,
+				reason~="" and " Reason: "..reason or ""))
+		return oldkick(name, param, ...)
+	end
+end

worldmods/irc/config.lua

@@ -0,0 +1,56 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+
+irc.config = {}
+
+local function setting(stype, name, default, required)
+	local value
+	if stype == "bool" then
+		value = minetest.setting_getbool("irc."..name)
+	elseif stype == "string" then
+		value = minetest.setting_get("irc."..name)
+	elseif stype == "number" then
+		value = tonumber(minetest.setting_get("irc."..name))
+	end
+	if value == nil then
+		if required then
+			error("Required configuration option irc."..
+				name.." missing.")
+		end
+		value = default
+	end
+	irc.config[name] = value
+end
+
+-------------------------
+-- BASIC USER SETTINGS --
+-------------------------
+
+setting("string", "nick", nil, true) -- Nickname
+setting("string", "server", nil, true) -- Server address to connect to
+setting("number", "port", 6667) -- Server port to connect to
+setting("string", "NSPass") -- NickServ password
+setting("string", "sasl.user", irc.config.nick) -- SASL username
+setting("string", "username", "Minetest") -- Username/ident
+setting("string", "realname", "Minetest") -- Real name/GECOS
+setting("string", "sasl.pass") -- SASL password
+setting("string", "channel", nil, true) -- Channel to join
+setting("string", "key") -- Key for the channel
+setting("bool",   "send_join_part", true) -- Whether to send player join and part messages to the channel
+setting("bool",   "send_kicks", false) -- Whether to send player kicked messages to the channel
+
+-----------------------
+-- ADVANCED SETTINGS --
+-----------------------
+
+setting("string", "password") -- Server password
+setting("bool",   "secure", false) -- Enable a TLS connection, requires LuaSEC
+setting("number", "timeout", 60) -- Underlying socket timeout in seconds.
+setting("number", "reconnect", 600) -- Time between reconnection attempts, in seconds.
+setting("string", "command_prefix") -- Prefix to use for bot commands
+setting("bool",   "debug", false) -- Enable debug output
+setting("bool",   "enable_player_part", true) -- Whether to enable players joining and parting the channel
+setting("bool",   "auto_join", true) -- Whether to automatically show players in the channel when they join
+setting("bool",   "auto_connect", true) -- Whether to automatically connect to the server on mod load
+

worldmods/irc/hooks.lua

@@ -0,0 +1,258 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+local ie = ...
+
+-- MIME is part of LuaSocket
+local b64e = ie.require("mime").b64
+
+irc.hooks = {}
+irc.registered_hooks = {}
+
+
+local stripped_chars = "[\2\31]"
+
+local function normalize(text)
+	-- Strip colors
+	text = text:gsub("\3[0-9][0-9,]*", "")
+
+	return text:gsub(stripped_chars, "")
+end
+
+
+function irc.doHook(conn)
+	for name, hook in pairs(irc.registered_hooks) do
+		for _, func in pairs(hook) do
+			conn:hook(name, func)
+		end
+	end
+end
+
+
+function irc.register_hook(name, func)
+	irc.registered_hooks[name] = irc.registered_hooks[name] or {}
+	table.insert(irc.registered_hooks[name], func)
+end
+
+
+function irc.hooks.raw(line)
+	if irc.config.debug then
+		print("RECV: "..line)
+	end
+end
+
+
+function irc.hooks.send(line)
+	if irc.config.debug then
+		print("SEND: "..line)
+	end
+end
+
+
+function irc.hooks.chat(msg)
+	local channel, text = msg.args[1], msg.args[2]
+	if text:sub(1, 1) == string.char(1) then
+		irc.conn:invoke("OnCTCP", msg)
+		return
+	end
+
+	if channel == irc.conn.nick then
+		irc.last_from = msg.user.nick
+		irc.conn:invoke("PrivateMessage", msg)
+	else
+		irc.last_from = channel
+		irc.conn:invoke("OnChannelChat", msg)
+	end
+end
+
+
+local function get_core_version()
+	local status = minetest.get_server_status()
+	local start_pos = select(2, status:find("version=", 1, true))
+	local end_pos = status:find(",", start_pos, true)
+	return status:sub(start_pos + 1, end_pos - 1)
+end
+
+
+function irc.hooks.ctcp(msg)
+	local text = msg.args[2]:sub(2, -2)  -- Remove ^C
+	local args = text:split(' ')
+	local command = args[1]:upper()
+
+	local function reply(s)
+		irc.queue(irc.msgs.notice(msg.user.nick,
+				("\1%s %s\1"):format(command, s)))
+	end
+
+	if command == "ACTION" and msg.args[1] == irc.config.channel then
+		local action = text:sub(8, -1)
+		irc.sendLocal(("* %s@IRC %s"):format(msg.user.nick, action))
+	elseif command == "VERSION" then
+		reply(("Minetest version %s, IRC mod version %s.")
+			:format(get_core_version(), irc.version))
+	elseif command == "PING" then
+		reply(args[2])
+	elseif command == "TIME" then
+		reply(os.date())
+	end
+end
+
+
+function irc.hooks.channelChat(msg)
+	local text = normalize(msg.args[2])
+
+	irc.check_botcmd(msg)
+
+	-- Don't let a user impersonate someone else by using the nick "IRC"
+	local fake = msg.user.nick:lower():match("^[il|]rc$")
+	if fake then
+		irc.sendLocal("<"..msg.user.nick.."@IRC> "..text)
+		return
+	end
+
+	-- Support multiple servers in a channel better by converting:
+	-- "<server@IRC> <player> message" into "<player@server> message"
+	-- "<server@IRC> *** player joined/left the game" into "*** player joined/left server"
+	-- and "<server@IRC> * player orders a pizza" into "* player@server orders a pizza"
+	local foundchat, _, chatnick, chatmessage =
+		text:find("^<([^>]+)> (.*)$")
+	local foundjoin, _, joinnick =
+		text:find("^%*%*%* ([^%s]+) joined the game$")
+	local foundleave, _, leavenick =
+		text:find("^%*%*%* ([^%s]+) left the game$")
+	local foundaction, _, actionnick, actionmessage =
+		text:find("^%* ([^%s]+) (.*)$")
+
+	if text:sub(1, 5) == "[off]" then
+		return
+	elseif foundchat then
+		irc.sendLocal(("<%s@%s> %s")
+				:format(chatnick, msg.user.nick, chatmessage))
+	elseif foundjoin then
+		irc.sendLocal(("*** %s joined %s")
+				:format(joinnick, msg.user.nick))
+	elseif foundleave then
+		irc.sendLocal(("*** %s left %s")
+				:format(leavenick, msg.user.nick))
+	elseif foundaction then
+		irc.sendLocal(("* %s@%s %s")
+				:format(actionnick, msg.user.nick, actionmessage))
+	else
+		irc.sendLocal(("<%s@IRC> %s"):format(msg.user.nick, text))
+	end
+end
+
+
+function irc.hooks.pm(msg)
+	-- Trim prefix if it is found
+	local text = msg.args[2]
+	local prefix = irc.config.command_prefix
+	if prefix and text:sub(1, #prefix) == prefix then
+		text = text:sub(#prefix + 1)
+	end
+	irc.bot_command(msg, text)
+end
+
+
+function irc.hooks.kick(channel, target, prefix, reason)
+	if target == irc.conn.nick then
+		minetest.chat_send_all("IRC: kicked from "..channel.." by "..prefix.nick..".")
+		irc.disconnect("Kicked")
+	else
+		irc.sendLocal(("-!- %s was kicked from %s by %s [%s]")
+				:format(target, channel, prefix.nick, reason))
+	end
+end
+
+
+function irc.hooks.notice(user, target, message)
+	if user.nick and target == irc.config.channel then
+		irc.sendLocal("-"..user.nick.."@IRC- "..message)
+	end
+end
+
+
+function irc.hooks.mode(user, target, modes, ...)
+	local by = ""
+	if user.nick then
+		by = " by "..user.nick
+	end
+	local options = ""
+	if select("#", ...) > 0 then
+		options = " "
+	end
+	options = options .. table.concat({...}, " ")
+	minetest.chat_send_all(("-!- mode/%s [%s%s]%s")
+			:format(target, modes, options, by))
+end
+
+
+function irc.hooks.nick(user, newNick)
+	irc.sendLocal(("-!- %s is now known as %s")
+			:format(user.nick, newNick))
+end
+
+
+function irc.hooks.join(user, channel)
+	irc.sendLocal(("-!- %s joined %s")
+			:format(user.nick, channel))
+end
+
+
+function irc.hooks.part(user, channel, reason)
+	reason = reason or ""
+	irc.sendLocal(("-!- %s has left %s [%s]")
+			:format(user.nick, channel, reason))
+end
+
+
+function irc.hooks.quit(user, reason)
+	irc.sendLocal(("-!- %s has quit [%s]")
+			:format(user.nick, reason))
+end
+
+
+function irc.hooks.disconnect(_, isError)
+	irc.connected = false
+	if isError then
+		minetest.log("error",  "IRC: Error: Disconnected, reconnecting in one minute.")
+		minetest.chat_send_all("IRC: Error: Disconnected, reconnecting in one minute.")
+		minetest.after(60, irc.connect, irc)
+	else
+		minetest.log("action", "IRC: Disconnected.")
+		minetest.chat_send_all("IRC: Disconnected.")
+	end
+end
+
+
+function irc.hooks.preregister(conn)
+	if not (irc.config["sasl.user"] and irc.config["sasl.pass"]) then return end
+	local authString = b64e(
+		("%s\x00%s\x00%s"):format(
+		irc.config["sasl.user"],
+		irc.config["sasl.user"],
+		irc.config["sasl.pass"])
+	)
+	conn:send("CAP REQ sasl")
+	conn:send("AUTHENTICATE PLAIN")
+	conn:send("AUTHENTICATE "..authString)
+	conn:send("CAP END")
+end
+
+
+irc.register_hook("PreRegister",     irc.hooks.preregister)
+irc.register_hook("OnRaw",           irc.hooks.raw)
+irc.register_hook("OnSend",          irc.hooks.send)
+irc.register_hook("DoPrivmsg",       irc.hooks.chat)
+irc.register_hook("OnPart",          irc.hooks.part)
+irc.register_hook("OnKick",          irc.hooks.kick)
+irc.register_hook("OnJoin",          irc.hooks.join)
+irc.register_hook("OnQuit",          irc.hooks.quit)
+irc.register_hook("NickChange",      irc.hooks.nick)
+irc.register_hook("OnCTCP",          irc.hooks.ctcp)
+irc.register_hook("PrivateMessage",  irc.hooks.pm)
+irc.register_hook("OnNotice",        irc.hooks.notice)
+irc.register_hook("OnChannelChat",   irc.hooks.channelChat)
+irc.register_hook("OnModeChange",    irc.hooks.mode)
+irc.register_hook("OnDisconnect",    irc.hooks.disconnect)
+

worldmods/irc/init.lua

@@ -0,0 +1,218 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+
+-- Handle mod security if needed
+local ie, req_ie = _G, minetest.request_insecure_environment
+if req_ie then ie = req_ie() end
+if not ie then
+	error("The IRC mod requires access to insecure functions in order "..
+		"to work.  Please add the irc mod to your secure.trusted_mods "..
+		"setting or disable the irc mod.")
+end
+
+ie.package.path =
+		-- To find LuaIRC's init.lua
+		modpath.."/?/init.lua;"
+		-- For LuaIRC to find its files
+		..modpath.."/?.lua;"
+		..ie.package.path
+
+-- The build of Lua that Minetest comes with only looks for libraries under
+-- /usr/local/share and /usr/local/lib but LuaSocket is often installed under
+-- /usr/share and /usr/lib.
+if not rawget(_G, "jit") and package.config:sub(1, 1) == "/" then
+	ie.package.path = ie.package.path..
+			";/usr/share/lua/5.1/?.lua"..
+			";/usr/share/lua/5.1/?/init.lua"
+	ie.package.cpath = ie.package.cpath..
+			";/usr/lib/lua/5.1/?.so"
+end
+
+-- Temporarily set require so that LuaIRC can access it
+local old_require = require
+require = ie.require
+
+-- Silence warnings about `module` in `ltn12`.
+local old_module = rawget(_G, "module")
+rawset(_G, "module", ie.module)
+
+local lib = ie.require("irc")
+
+irc = {
+	version = "0.2.0",
+	connected = false,
+	cur_time = 0,
+	message_buffer = {},
+	recent_message_count = 0,
+	joined_players = {},
+	modpath = modpath,
+	lib = lib,
+}
+
+-- Compatibility
+rawset(_G, "mt_irc", irc)
+
+local getinfo = debug.getinfo
+local warned = { }
+
+local function warn_deprecated(k)
+	local info = getinfo(3)
+	local loc = info.source..":"..info.currentline
+	if warned[loc] then return end
+	warned[loc] = true
+	print("COLON: "..tostring(k))
+	minetest.log("warning", "Deprecated use of colon notation when calling"
+			.." method `"..tostring(k).."` at "..loc)
+end
+
+-- This is a hack.
+setmetatable(irc, {
+	__newindex = function(t, k, v)
+		if type(v) == "function" then
+			local f = v
+			v = function(me, ...)
+				if rawequal(me, t) then
+					warn_deprecated(k)
+					return f(...)
+				else
+					return f(me, ...)
+				end
+			end
+		end
+		rawset(t, k, v)
+	end,
+})
+
+dofile(modpath.."/config.lua")
+dofile(modpath.."/messages.lua")
+loadfile(modpath.."/hooks.lua")(ie)
+dofile(modpath.."/callback.lua")
+dofile(modpath.."/chatcmds.lua")
+dofile(modpath.."/botcmds.lua")
+
+-- Restore old (safe) functions
+require = old_require
+rawset(_G, "module", old_module)
+
+if irc.config.enable_player_part then
+	dofile(modpath.."/player_part.lua")
+else
+	setmetatable(irc.joined_players, {__index = function() return true end})
+end
+
+minetest.register_privilege("irc_admin", {
+	description = "Allow IRC administrative tasks to be performed.",
+	give_to_singleplayer = true
+})
+
+local stepnum = 0
+
+minetest.register_globalstep(function(dtime) return irc.step(dtime) end)
+
+function irc.step()
+	if stepnum == 3 then
+		if irc.config.auto_connect then
+			irc.connect()
+		end
+	end
+	stepnum = stepnum + 1
+
+	if not irc.connected then return end
+
+	-- Hooks will manage incoming messages and errors
+	local good, err = xpcall(function() irc.conn:think() end, debug.traceback)
+	if not good then
+		print(err)
+		return
+	end
+end
+
+
+function irc.connect()
+	if irc.connected then
+		minetest.log("error", "IRC: Ignoring attempt to connect when already connected.")
+		return
+	end
+	irc.conn = irc.lib.new({
+		nick = irc.config.nick,
+		username = irc.config.username,
+		realname = irc.config.realname,
+	})
+	irc.doHook(irc.conn)
+
+	-- We need to swap the `require` function again since
+	-- LuaIRC `require`s `ssl` if `irc.secure` is true.
+	old_require = require
+	require = ie.require
+
+	local good, message = pcall(function()
+		irc.conn:connect({
+			host = irc.config.server,
+			port = irc.config.port,
+			password = irc.config.password,
+			timeout = irc.config.timeout,
+			reconnect = irc.config.reconnect,
+			secure = irc.config.secure
+		})
+	end)
+
+	require = old_require
+
+	if not good then
+		minetest.log("error", ("IRC: Connection error: %s: %s -- Reconnecting in %d seconds...")
+					:format(irc.config.server, message, irc.config.reconnect))
+		minetest.after(irc.config.reconnect, function() irc.connect() end)
+		return
+	end
+
+	if irc.config.NSPass then
+		irc.conn:queue(irc.msgs.privmsg(
+				"NickServ", "IDENTIFY "..irc.config.NSPass))
+	end
+
+	irc.conn:join(irc.config.channel, irc.config.key)
+	irc.connected = true
+	minetest.log("action", "IRC: Connected!")
+	minetest.chat_send_all("IRC: Connected!")
+end
+
+
+function irc.disconnect(message)
+	if irc.connected then
+		--The OnDisconnect hook will clear irc.connected and print a disconnect message
+		irc.conn:disconnect(message)
+	end
+end
+
+
+function irc.say(to, message)
+	if not message then
+		message = to
+		to = irc.config.channel
+	end
+	to = to or irc.config.channel
+
+	irc.queue(irc.msgs.privmsg(to, message))
+end
+
+
+function irc.reply(message)
+	if not irc.last_from then
+		return
+	end
+	message = message:gsub("[\r\n%z]", " \\n ")
+	irc.say(irc.last_from, message)
+end
+
+function irc.send(msg)
+	if not irc.connected then return end
+	irc.conn:send(msg)
+end
+
+function irc.queue(msg)
+	if not irc.connected then return end
+	irc.conn:queue(msg)
+end
+

worldmods/irc/messages.lua

@@ -0,0 +1,17 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+irc.msgs = irc.lib.msgs
+
+function irc.logChat(message)
+	minetest.log("action", "IRC CHAT: "..message)
+end
+
+function irc.sendLocal(message)
+	minetest.chat_send_all(message)
+	irc.logChat(message)
+end
+
+function irc.playerMessage(name, message)
+	return ("<%s> %s"):format(name, message)
+end

worldmods/irc/mod.conf

@@ -0,0 +1 @@
+name = irc

worldmods/irc/player_part.lua

@@ -0,0 +1,69 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+
+function irc.player_part(name)
+	if not irc.joined_players[name] then
+		return false, "You are not in the channel"
+	end
+	irc.joined_players[name] = nil
+	return true, "You left the channel"
+end
+
+function irc.player_join(name)
+	if irc.joined_players[name] then
+		return false, "You are already in the channel"
+	end
+	irc.joined_players[name] = true
+	return true, "You joined the channel"
+end
+
+
+minetest.register_chatcommand("join", {
+	description = "Join the IRC channel",
+	privs = {shout=true},
+	func = function(name)
+		return irc.player_join(name)
+	end
+})
+
+minetest.register_chatcommand("part", {
+	description = "Part the IRC channel",
+	privs = {shout=true},
+	func = function(name)
+		return irc.player_part(name)
+	end
+})
+
+minetest.register_chatcommand("who", {
+	description = "Tell who is currently on the channel",
+	privs = {},
+	func = function()
+		local out, n = { }, 0
+		for plname in pairs(irc.joined_players) do
+			n = n + 1
+			out[n] = plname
+		end
+		table.sort(out)
+		return true, "Players in channel: "..table.concat(out, ", ")
+	end
+})
+
+
+minetest.register_on_joinplayer(function(player)
+	local name = player:get_player_name()
+	irc.joined_players[name] = irc.config.auto_join
+end)
+
+
+minetest.register_on_leaveplayer(function(player)
+	local name = player:get_player_name()
+	irc.joined_players[name] = nil
+end)
+
+function irc.sendLocal(message)
+	for name, _ in pairs(irc.joined_players) do
+		minetest.chat_send_player(name, message)
+	end
+	irc.logChat(message)
+end