bit.ly shortener function in Lua

bitly.lua

function bitlyshorten(longurl)
	local http = require('socket.http')
--please specify your account ID and API key
	local r,c = http.request('http://api.bitly.com/shorten?login=YOUR_LOGINID&apiKey=YOUR_API_KEY&longUrl='..longurl)
	local json = require('json')
	local decjson = json.decode(r)

	local shorturl

	for k,v in pairs(decjson.results) do
		shorturl = decjson.results[k].shortUrl
	end

	return shorturl
end

--local shorturi = bitlyshorten('http://www.example.com/')