Security Card Reader

-- Security Card Reader
-- Requires Security Card API

local lvl1 = "something"
local lvl2 = "something"
local pass = "password"
local disklvl1, disklvl2, diskpass

if(not card)then
    if(os.loadAPI("card")~=true)then
        error("This program needs the security card API to function")
    end
end

term.clear()
term.setCursorPos(1,1)
while true do
    print("Needs a security card to function")
    print("Insert a security card to continue...")
    --pullEventRaw stops them from pressing Ctrl-T to terminate
    local event, side = os.pullEventRaw("disk")
    if disk.hasAudio(side) then
        print("Wrong disk type")
        print("Press any key to continue...")
        os.pullEventRaw("key")
    else
        break
    end
end

term.scroll(1)
term.write("Reading")
textutils.slowPrint("...")
disklvl1,disklvl2,diskpass = card.getDiskLevel("bottom")
if(disklvl1~=false)then
    if(disklvl1==lvl1 and disklvl2==lvl2 and diskpass==pass)then
        --Do Something example turns all rs outputs on for 5 seconds
        for n,sSide in ipairs(rs.getSides())do
            rs.setOutput(sSide,true)
        end
        sleep(5)
        for n,sSide in ipairs(rs.getSides())do
            rs.setOutput(sSide,false)
        end
    else
        print("Wrong Security Card")
    end
else
    print("Unable to read security card")
end
os.unloadAPI("card")
--Good Programming Practice :)