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-- Basic keycard lock by Lymia
-- Released to the public domain

-- Clears the terminal
term.clear()
term.setCursorPos(1,1)

-- What file to look for the password in
local keyFile = "lockFile"
-- The password to look for
local keyContents = "12345"
-- What side to output the door signal to
local outputSide = "left"

while true do
    -- Get raw event data
    local rawEvent = {coroutine.yield()}
    local event = rawEvent[1]
    if event == "disk" then
        local side = rawEvent[2]

        -- Check if this is a data disk
        if disk.isPresent(side) and disk.hasData(side) then
            -- And if so, try to open the lock file
            local file = "/"..disk.getMountPath(side).."/"..keyFile
            file = fs.open(file,"r")
            if file then
                file = file.readAll()

                if file == keyContents then
                    print("Keyfile accepted!")
                    -- Send the door signal...
                    rs.setOutput(outputSide,true)
                    -- Send a "timer" event after 4 seconds
                    -- I could use sleep here, but, this way, I can still process disk
                    -- events while the redstone signal is on.
                    os.startTimer(4)
                else
                    print("Invalid keyfile")
                end
            else
                -- Guess the lockfile's not there
                print("Keyfile not found")
            end
        else
            print("Keyfile not found")
        end

        -- And now, eject the disk
        disk.eject(side)
    elseif event == "timer" then
        -- This follows the timer set up in the lock checking code.
        -- Unset the door signal.
        rs.setOutput(outputSide,false)
    elseif event == "terminate" then
        -- Prevents Ctrl-T (It would be ignored otherwise anyways, but...)
        print("[termination intercepted]")
    end
end