Use LuaSocket's base 64 encoding function

hooks.lua

@@ -1,6 +1,8 @@
 -- This file is licensed under the terms of the BSD 2-clause license.
 -- See LICENSE.txt for details.
 
+-- MIME is part of LuaSocket
+local b64e = require("mime").b64
 
 irc.hooks = {}
 irc.registered_hooks = {}
@@ -213,7 +215,7 @@ end
 
 function irc.hooks.preregister(conn)
 	if not (irc.config["sasl.user"] and irc.config["sasl.pass"]) then return end
-	local authString = irc.b64e(
+	local authString = b64e(
 		("%s\x00%s\x00%s"):format(
 		irc.config["sasl.user"],
 		irc.config["sasl.user"],

init.lua

@@ -30,7 +30,6 @@ dofile(modpath.."/hooks.lua")
 dofile(modpath.."/callback.lua")
 dofile(modpath.."/chatcmds.lua")
 dofile(modpath.."/botcmds.lua")
-dofile(modpath.."/util.lua")
 if irc.config.enable_player_part then
 	dofile(modpath.."/player_part.lua")
 else

util.lua

@@ -1,20 +0,0 @@
---Base 64 encode -- for SASL authentication
-local b='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
-function irc.b64e(data)
-	return ((data:gsub('.', function(x)
-		local r,b='',x:byte()
-		for i=8,1,-1 do r=r..(b%2^i-b%2^(i-1)>0 and '1' or '0') end
-		return r;
-	end)..'0000'):gsub('%d%d%d?%d?%d?%d?', function(x)
-		if (#x < 6) then return '' end
-		local c=0
-		for i=1,6 do c=c+(x:sub(i,i)=='1' and 2^(6-i) or 0) end
-		return b:sub(c+1,c+1)
-	end)..({ '', '==', '=' })[#data%3+1])
-end
-
-
--- Requested by Exio
-string.expandvars = function(s, vars)
-        return s:gsub("%$%(([^)]+)%)", vars)
-end