Remote Lua loader for FXServer

remote-lua-loader.lua

-- Define the location of the lua code to be ran
local luaFileLocation = "https://gist.githubusercontent.com/jaymo1011/9240509b7b8bef9fba1f55513d155eb0/raw"

-- Setup sandboxed lua environment
local sandbox = {}

-- These will not be included within the sandbox
-- Additionally, there should not be the need to protect any libraries as nothing else will execute after this file
local unsafeFunctions = {
	["sandbox"] = true,
	["unsafeFunctions"] = true,
	["os"] = true,
	["io"] = true,
	["debug"] = true,

	-- Can be used
	["getfenv"] = true,
	["setfenv"] = true,

--[[
	-- Metatables are useful :(

	-- Can set metatables
	["getmetatable"] = true,
	["setmetatable"] = true,

	-- Bypasses metatables
	["rawget"] = true,
	["rawset"] = true,
]]
}
-- Add everything which isn't unsafe from the global environment.
for k,v in pairs(_G) do
	if k == "_G" or k == "_ENV" then
		sandbox[k] = sandbox
	elseif not unsafeFunctions[k] then
		sandbox[k] = v
	end
end

-- Add back some useful functions
sandbox.os = {
	clock = os.clock,
	date = os.date,
	difftime = os.difftime,
	time = os.time,
}

sandbox.io = {
	read = io.read,
	write = io.write,
	type = io.type,
}

-- Try fetching the file
PerformHttpRequest(luaFileLocation, function (statusCode, resultData)
	local luaChunk = false

	local success, errorString = pcall(function()
		local luaString = false

		if statusCode == 200 then	
			-- If the file fetches okay, process the result data and save a file backup incase we can't access it later for whatever reason
			luaString = resultData
			SaveResourceFile(GetCurrentResourceName(), "remotefilebackup.backup", luaString, -1)
		else
			-- If we could not fetch the file, try and load our backup
			luaString = LoadResourceFile(GetCurrentResourceName(), "remotefilebackup.backup") or false
		end

		-- Assert there is a lua string to be loaded
		assert(luaString, "could not load lua from remote location")

		-- Load the lua string into the sandbox environment 
		luaChunk, errorString = load(luaString, "remote-lua", "t", sandbox)
		
		-- Assert that we have a lua chunk
		assert(luaChunk, errorString)
	end)

	-- If anything errored in the loading process, return early and inform the user
	if not success then
		print(string.format("^1Error loading remote lua file ^7[^3%s^7]^1:%s", luaFileLocation, errorString))
		return
	end

	-- Finally, execute the lua chunk
	luaChunk()
end)