--[[
  Password Lock Program for OpenComputers


  This program is designed to run indefinitely on a basic terminal to provide
  password protection via redstone. It includes configurations for the door open
  duration, redstone output side, password, and an "admin" break password that will
  allow a user to gracefully terminate the program.


  By badcode9, 2016
]]

local component = require("component")

if not component.isAvailable("redstone") then
  io.stderr:write("This program requires either a Redstone Card Tier 1 or Redstone I/O block to run.\n")
  return
end
local rs = component.redstone

local os = require("os")
local term = require("term")
local text = require("text")
local sides = require("sides")




--[[ Config ]]-----------------------------------------------------------------
local pass = "password"
local d = 5 -- Door open duration
local s = sides.bottom -- Where to output redstone signal to open the door

--[[ Door Control ]]-----------------------------------------------------------
local function openDoor(duration)
  -- Open door for the duration provided, then close again.
  rs.setOutput(s, 0)
  os.sleep(duration)
  rs.setOutput(s, 255)
end

--[[ Main ]]-------------------------------------------------------------------

-- Close door on init
rs.setOutput(s, 255)

while true do
 term.clear()

 -- Password Request
 print("Enter Password:")
 answer = text.trim(term.read(nil, false, nil, "*"))  -- Masking input characters; trim newline
 term.setCursor(1,2)
 term.clearLine()

 -- Password Check
 if answer == "admin" then -- admin pwd to break execution
  term.clear()
  print("Admin Override\n")
  return
 elseif answer == pass then
   print("ACCESS GRANTED")
   openDoor(d)
 else
   print("ACCESS DENIED")
   os.sleep(3)
 end
end