password server

term.clear()
term.setCursorPos(1,1)
print("This is a password server. There is no user interaction here.")
print("Please find a computer and login there.")
local firstCycle = true
local validSender = false
local modem = peripheral.wrap("left")
local valid = false
users = {"test", "JVN1" }
passwords = {"test", "4370" }
senders = { 10, 11, 12 }
modem.open(500)
while true do
event, senderId, message, distance = os.pullEvent("modem_message")
for i,v in ipairs(senders) do
  if v == senderId then
   validSender = true
   break
  end
end
if validSender == true then
  for i,v in ipairs(users) do
   if message == v then
        valid = true
        password = passwords[i]
        break
   else
        valid = false
   end
  end
  if valid then
   modem.transmit(500, 500, senderId, password, true)
  else
   modem.transmit(500, 500, "Not Valid", true)
  end
end
end