OpenSecurity Keypad Program

local c = require("component")
local keypad = c.os_keypad
local computer = require("computer")
local event = require("event")

local code = "12345678"                                        -- Your code (Max 8 digits to fit on keypad display)
local user_code = ""                                           -- Variable that stores input

local run = true
while run do
  local e, address, _, key = event.pull(1000)
  if (e and e == "interrupted") then                           -- Kill program when ctrl + c is pressed
    run = false
  elseif (e and e == "keypad") then
    if (key and key == "*") then                               -- Uses star button as reset key
      user_code = ""
      keypad.setDisplay("")
    elseif (key) then                                          -- On key other than reset key add it to user_code
      user_code = user_code .. key
      keypad.setDisplay(user_code)                             -- Update display to updated input string
    end
    if (string.len(code) == string.len(user_code)) then        -- If code and user_code are the same length:
      if (code == user_code) then                              -- Test if they match
        computer.beep(2000)
        print("Code correct!")
        keypad.setDisplay("CORRECT")
        user_code = ""
      else
        computer.beep(100)
        print("Wrong code!")
        keypad.setDisplay("WRONG")
        user_code = ""
      end
    end
  elseif (e and e == "magData") then                           -- If mag card is detected, check if stored string matches code
    if (key == code) then
      keypad.setDisplay("CORRECT")
      computer.beep(2000)
    else
      keypad.setDisplay("DENIED")
      computer.beep(100)
    end
  end
end