local component = require("component")
local computer = require("computer")
local alarm = component.os_alarm

allowed_players = {"SuPeRMiNoR2", "MoreUsers", "EvenMore"}
range = 30

while true do
  clear = true

  for address, type in component.list("os_entdetector") do
    entity = component.proxy(address)
    players = entity.scanPlayers(range)
    for _, person in ipairs(players) do
      uservalid = false
      for _, allowed in ipairs(allowed_players) do
       if allowed == person.name then
        print("Detected allowed player:" .. person.name)
        uservalid = true
       end
      end
      if uservalid == false then
        print("Detected invalid player:" .. person.name)
        clear = false
      end
    end
  end

  if clear then
    alarm.deactivate()
  end

  if clear == false then
    alarm.activate()
  end

  os.sleep(1)

end