(lua) Door Lock password change

I have a door lock program that requires the user to know the password to gain entry, but I want to know how I can code it so the user can change the password and have the change stay even after a reboot.

function lock()
term.clear()
term.setCursorPos(1,1)
os.pullEvent = os.pullEventRaw
pass = io.read()
if pass == "*ignore asterisks, password goes here**" then
term.clear()
redstone.setOutput("left" , true)
sleep(3)
redstone.setOutput("left" , false)
lock()
else
lock()
end
end
lock()

Use the file API You want to do something like"

local hndl = fs.open("password","r")
local match = hndl.readAll() hndl.close()

You use match in "if pass == match". Then later, when you want to save a different password entered by the user, you use

hndl = fs.open("password","w")
hndl.writeLine(read()) hndl.close()

ChunLing, on 23 October 2012 - 01:31 AM said:

Use the file API You want to do something like"

local hndl = fs.open("password","r")
local match = hndl.readAll() hndl.close()

You use match in "if pass == match". Then later, when you want to save a different password entered by the user, you use

hndl = fs.open("password","w")
hndl.writeLine(read()) hndl.close()

So the variable 'local hndl' will create a file to store the passwords by itself?
I'm kind of confused how to combine them.

function lock()
term.clear()
term.setCursorPos(1,1)
os.pullEvent = os.pullEventRaw
print("Hello user! Type your password or type 'New' to change your password.")
local hndl = fs.open("password" , "r")
local match = hndl.readAll() hndl.close()
pass = io.read()
if pass == "match" then
term.clear()
redstone.setOutput("left" , true)
sleep(3)
redstone.setOutput("left" , false)
lock()
elseif pass= "New"
-- Kind of stuck at this point
lock()
end
end
lock()

Here's a simple program for you

os.pullEvent = os.pullEventRaw
sFile = "passwords.txt"
sRoot = "DoorLock/"

function clear()
	term.clear()
	term.setCursorPos(1,1)
end

-- [[ Check if folder/file for password exists | read password and set pass functions ]] --

function checkFolder()
	if not fs.exists(sRoot) then
		fs.makeDir(sRoot)
		file = fs.open(sRoot..sFile, "w")
		file.close()
	end
end

function readPass()
	file = fs.open(sRoot..sFile, "r")
	line = file.readLine()
	file.close()
end

function setPass()
	clear()
	print("Please set a password:")
	write("  > ")
	pass = read()
	file = fs.open(sRoot..sFile, "w")
	file.write(pass)
	file.close()
	print("nPassword has been changed to: "..pass)
	sleep(3)
end

-- [[ Open door function ]] --

function OpenDoor()
	clear()
	print("Password correct! Please proceed.")
	redstone.setOutput("left" , true)
	sleep(3)
	redstone.setOutput("left" , false)
end

checkFolder()

-- [[ Main part ]] --

while true do
	readPass()
	clear()
	if line == nil then
		setPass()
	else
		print("Type 'new' to set a new password")
		print("Please enter password:")
		write("  > ")
		pass = read("*")
		if pass == line then
			OpenDoor()
		elseif pass == "new" then
			setPass()
		else
			clear()
			print("Invalid password.")
			sleep(3)
		end
	end
end

The creation of local hndl = fs.open("password","r") just makes it so that you can access a file named password. You should create that file yourself using the edit command. The creation of local match = hndl.readAll() is what allows you to use the password you stored in the file named password. Then we call hndl.close() so that we don't have the file still open, cause we already read it and the password is stored in match.

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