sandboxed lua eval.lua

function runCode(code)
    local environment = {
        --
        -- global functions
        --
        print = print,
        tostring = tostring,
        tonumber = tonumber,
        type = type,
        pairs = pairs,
        error = error,
        ipairs = ipairs,
        next = next,
        unpack = unpack,
        _VERSION = _VERSION,
        select = select,

        --
        -- global libraries/tables
        --
        math = math,
        string = string,
        table = table,

        --
        -- global variables
        --
        ping = "pong!",
        --message = message,
    }

    local func, err = loadstring("return ".. code, "eval", "t", environment)
    if err and (not func) then -- return <code> doesn't work, let's try without return
        func, err = loadstring(code, "eval", "t", environment)

        if err and (not func) then
            return false, err
        end

        local ret = {func()}
        if ret and #ret > 0 then
            return true, ret
        end

        return true
    end

    local ret = {func()}
    if ret and #ret > 0 then
        return true, ret
    end

    return true
end

--
-- Example code, showcases a use case with multiple returns
--

local ok, ret = runCode("return 1, 2, 3")
if ok and ret then
    print(unpack(ret))
end

kek

+1 nice