Updated IRC to handle mod security

- Solves part of #47

mods/irc/README.md

@@ -32,6 +32,11 @@ many distributions, for example:
 	# # On Debian/Ubuntu:
 	# apt-get install lua-socket
 
+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
+
 
 Settings
 --------

mods/irc/hooks.lua

@@ -1,8 +1,10 @@
 -- 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 = require("mime").b64
+local b64e = ie.require("mime").b64
 
 irc.hooks = {}
 irc.registered_hooks = {}

mods/irc/init.lua

@@ -3,25 +3,40 @@
 
 local modpath = minetest.get_modpath(minetest.get_current_modname())
 
-package.path =
+-- 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;"
-		..package.path
+		..ie.package.path
 		..";/usr/lib/*/lua/5.1/socket/*.so"
 
 -- 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
-	package.path = package.path..
+	ie.package.path = ie.package.path..
 			";/usr/share/lua/5.1/?.lua"..
 			";/usr/share/lua/5.1/?/init.lua"
-	package.cpath = package.cpath..
-			";/usr/lib/lua/5.1/?.so"
+if not rawget(_G, "jit") and package.config:sub(1, 1) == "/" then
+	ie.package.path = ie.package.path..
 end
 
+-- Temporarily set require so that LuaIRC can access it
+local old_require = require
+require = ie.require
+local lib = ie.require("irc")
+require = old_require
+
 irc = {
 	version = "0.2.0",
 	connected = false,
@@ -30,7 +45,7 @@ irc = {
 	recent_message_count = 0,
 	joined_players = {},
 	modpath = modpath,
-	lib = require("irc"),
+	lib = lib,
 }
 
 -- Compatibility
@@ -38,7 +53,7 @@ mt_irc = irc
 
 dofile(modpath.."/config.lua")
 dofile(modpath.."/messages.lua")
-dofile(modpath.."/hooks.lua")
+loadfile(modpath.."/hooks.lua")(ie)
 dofile(modpath.."/callback.lua")
 dofile(modpath.."/chatcmds.lua")
 dofile(modpath.."/botcmds.lua")