startup

os_pullEvent = os.pullEvent
os.pullEvent = os.pullEventRaw

local pd = peripheral.find("player_detector")

local w,h = term.getSize()
local welcome = {
  "Welcome to",
  "InputUsername's computer.",
  "",
  "Please identify yourself.",
}
local access = {
  "Access granted.",
  "Hello, %s.",
}
local noaccess = {
  "Access denied.",
  "Nice try, %s.",
}

local whitelist = {
  ["InputUsername"] = true,
  ["Lollonator"] = true,
  ["valithor2"] = true,
}

term.setBackgroundColor(colors.white)

while true do
  term.setTextColor(colors.lightGray)
  term.clear()

  for i=1,#welcome do
    term.setCursorPos(w/2-#welcome[i]/2+1,h/2-#welcome/2-1+i)
    textutils.slowPrint(welcome[i],25)
  end

  local e,_,p = os.pullEvent("player")
  if (whitelist[p] == true) then
    sleep(.5)
    term.setTextColor(colors.black)
    for i=1,#access do
      local s = access[i]:format(p)
      term.setCursorPos(w/2-#s/2+1,h/2+#welcome/2+1+i)
      textutils.slowPrint(s)
    end
    sleep(.5)
    break
  else
    sleep(.5)
    term.setTextColor(colors.black)
    for i=1,#noaccess do
      local s = noaccess[i]:format(p)
      term.setCursorPos(w/2-#s/2+1,h/2+#welcome/2+1+i)
      textutils.slowPrint(s)
    end
  end
end

term.setBackgroundColor(colors.black)
term.setCursorPos(1,1)
term.clear()

os.pullEvent = os_pullEvent