Auth Key program Readability revision

-- Changes
-- * moved everything into the .authKey folder.
--   the . makes the folder hidden
--
-- * added block to create .authKey folder if it
--   does not exist
--
-- * cahnged backslashes in file path strings to
--   forward slahes to prevent charecter escapes.
--
-- * renamed pass to passFile because having a
--   pass and a password is confusing.
--
-- * changed password to a local variable so others
--   cannot read it after program runs.
--
-- * added parenthesis to pass.close
--
-- * added return statement to first code block
--   to get rid of the setup variable
--
-- * changed "password = pass.readAll()" to
--   "password == pass.readAll()"
--
-- * Closed the passFile in password checking section.
--
-- * replaced the statement "goodPass = false" with
--   a return statement. This eliminates the
--   goodPass variable and removed a layer of
--   indentation of the bulk of your program.
--
-- * Moved all the code that creates files if they
--   dont exist into the beginning. Its good to put
--   similair code together.
--
-- * Moved code into local functions to seperate the
--   code that checks arguments and the code that
--   actually does stuff. This also means all your
--   code isn't in a gigantic if statement.
--
-- * renamed ranKey to randKey
--
-- * made pcID, user, and key local variables
--
-- * changed send functions to rednet.send functions
--
-- * changed "elseif fs.exists("authIDs\".. pcID) then"
--   to "else". there is only to parts of your if
--   and you dont have to check if the file exists twice.
--
-- * switched the sections in the " if not fs.exists("/.authKey/authIDs/".. pcID) then"
--   statement. I like to avoid negative logic.
--
-- * moved code into a main function. I like to do this
--   becuase all the main logic is up front and you
--   dont have to worry about what order all your
--   functions were declared. There is a main() at the
--   bottom of the code.
--
-- Edited by: GhastTearz
-- Original code at: www.pastebin.com/mGUecsv8

local args = { ... }

local function main()
    -- Make sure all needed files exist
    if not fs.exists("/.authKey") then
        fs.makeDir("/.authKey")
    end
    if not fs.exists("/.authKey/authKeys") then
        fs.makeDir("/.authKey/authKeys")
    end
    if not fs.exists("/.authKey/authIDs") then
        fs.makeDir("/.authKey/authIDs")
    end
    if not fs.exists("/.authKey/Settings") then
        fs.makeDir("/.authKey/Settings")
        print("Please set an admin password:")
        local password = read('*')
        local passFile = fs.open("/.authKey/Settings/password", "w")
        passFile.write(password)
        passFile.close()
        print("Thank you. You may now log in with that password in the future to make keys.")
        print("Keys can only be made from this server, and nowhere else.")
        return
    end

    print("Please enter your password:")
    local password = read('*')
    local passFile = fs.open("/.authKey/Settings/password", "r")
    local correctPassword = passFile.readAll()
    passFile.close()
    if password == correctPassword then
        print("Password correct, logging you in.")
    else
        printError("Password incorrect. Please try again.")
        return
    end

    if args[1] == "createKey" then
        if not args[2] then
            printError("Useage: authKey createKey <Username>")
        else
            createKey(args[2])
        end
    elseif args[1] == "startListener" then
        startListener()
    elseif args[1] == "changePass" then
        changePass()
    else
        printError("Usage:")
        printError("Add new user:                    authKey createKey <Username>")
        printError("Start listening for connections: authKey startListener")
        printError("Change admin password:           authKey changePass")
    end
end


local function createKey(userName)
    math.randomseed(os.time())
    randKey = math.random(10000000)
    local keys = fs.open("/.authKey/authKeys/".. userName, "w")
    keys.write(randKey)
    keys.close()
    print("Your key is: ".. ranKey)
    print("User ".. userName.. " can log in with the client using their username and key.")
    print("This key is valid for a one time use, and will never be usable again.")
end


local function startListener()
    while true do
        local pcID
        local user
        local key
        pcID, user, key = rednet.receive()
        if fs.exists("/.authKey/authIDs/".. pcID) then
            userFile = fs.open("/.authKey/authIDs/".. pcID, "r")
            user = userFile.readAll()
            userFile.close()
            rednet.send(pcID, "Welcome back, ".. user.. "!")
        else
            if fs.exists("/.authKey/authKeys/".. user) then
                keyFile = fs.open("/.authKey/authKeys/".. user, "r")
                if key == keyFile.readAll() then
                    keyFile.close()
                    rednet.send(pcID, "Success")
                    userPcID = fs.open("/.authKey/authIDs/".. pcID, "w")
                    userPcID.write(user)
                    userPcID.close()
                    fs.delete("/.authKey/authKeys/".. user)
                else
                    keyFile.close()
                    rednet.send(pcID, "Failure: Key does not match user.")
                end
            else
                rednet.send(pcID, "Failire: User does not exist.")
            end
        end
    end
end


local function changePass()
    print("Please set a new admin password: ")
    local password = read('*')
    local passFile = fs.open("/.authFile/Settings/password", "w")
    pass.write(password)
    pass.close()
    print("Thank you. You may now log in with that password in the future to make keys.")
    print("Keys can only be made from this server, and nowhere else.")
end


main()