Key Card Protected Door V2

-- Tutorial here: https://www.youtube.com/watch?v=vw7o00xvnLQ
-- For the Floppy Disk setup:
-- Insert the floppy into the disk drive adjacent to the computer
-- Go into the computer and type: edit disk/.security/key
-- Type inside the edit program: lemmein
-- do not include quotes
-- Save and exit, then reboot your computer.
-- It should open the door and eject the floppy disk.
-- If it doesn't follow the tutorial again.


-- feel free to change the following variables

-- password. THIS CANNOT CONTAIN SPACES
local PASSWORD = "lemmein"

-- which side of the computer a redstone signal should be sent
local RS_SIDE = "bottom"

-- default redstone power state
local RS_POWER = true

-- (optional) which side of the computer the disk drive is on
local DISK_SIDE = nil



-- auto-locate disk drive
if not DISK_SIDE then
    local peripheralSides = peripheral.getNames()
    for k,v in pairs(peripheral.getNames()) do
        if peripheral.getType(v) == "drive" then
            DISK_SIDE = v
            break
        end
    end
end

if not DISK_SIDE then
    print("Please attach a disk drive")
    return
end

-- initialize display
rs.setOutput(RS_SIDE, true)
os.pullEvent = os.pullEventRaw
term.clear()
term.setCursorPos(1,1)
term.write("Door Lock Program")
term.setTextColor(colors.lightGray)
term.setCursorPos(1,2)
term.write("Please insert floppy disk")

-- main event loop
local timer = -1
while true do
    local e = {os.pullEvent()}
    if e[1] == "disk" and e[2] == DISK_SIDE then
        -- get the mount path in case of multiple disks already inserted
        local mountPath = disk.getMountPath(DISK_SIDE)
        if mountPath then
            local keyPath = mountPath .. "/.security/key"
            if fs.exists(keyPath) then
                local file = fs.open(keyPath, "r")
                -- remove whitespace characters from password read from floppy disk
                local inputPassword = file.readAll():gsub("%s+", "")
                file.close()
                disk.eject(DISK_SIDE)
                if inputPassword == PASSWORD then
                    disk.eject(DISK_SIDE)
                    rs.setOutput(RS_SIDE, not RS_POWER)
                    timer = os.startTimer(3)
                end
            else
                disk.eject(DISK_SIDE)
            end
        else
            disk.eject(DISK_SIDE)
        end
    elseif e[1] == "timer" and e[2] == timer then
        rs.setOutput(RS_SIDE, RS_POWER)
    end
end