Computer Craft Player Detector

function table.contains(table, element)
    for _, value in pairs(table) do
        if value == element then
            return true
        end
    end
    return false
end

allowed = {"user"}
mini.lock()
mini.clear()
--print("Welcome to ...!")
print("Please authenticate.")
while true do
    e,p=os.pullEvent("player")
    if table.contains(allowed, p) then
        for k,v in pairs(rs.getSides()) do
            rs.setOutput(v, not rs.getOutput(v))
        end
        sleep(3)
        os.reboot()
    else
        print("Access Denied")
        sleep(3)
        os.reboot()
    end
end