Insecure Door RFID

local tArgs = { ... }
if #tArgs ~= 1 then
    print( "Usage: rfid_door <redstone_side>" )
    return
end

if (tArgs[1] ~= "front") and (tArgs[1] ~= "back") and (tArgs[1] ~= "top") and (tArgs[1] ~= "bottom") and (tArgs[1] ~= "left") and (tArgs[1] ~= "right") then
    print( "Please specify a valid side: front, back, top, bottom, left or right" )
    return
end

local redstone_side = tArgs[1]

local rfid_rw = peripheral.find("rfid_reader_writer")

while true do
    local rfid = rfid_rw.search()
    if rfid ~= nil then
        print(rfid)
        if not redstone.getOutput(redstone_side) then
            redstone.setOutput(redstone_side, true)
        end
    else
        redstone.setOutput(redstone_side, false)
    end
    sleep(1)
end