auth.lua

require("/scripts/auth/sha256")

local oldPull = os.pullEvent
os.pullEvent = os.pullEventRaw

function resetCursor(x, y)
 term.clear()
 term.setCursorPos(x, y)
end

function verify_user(username, password)
    for line in io.lines("/.password") do
        i = string.find(line, "|")
        if (i ~= nil and string.sub(line, 1, i-1) == username) then
   digest = digestStr(password)
            if string.sub(line, i+1) == digest then
    resetCursor(1, 1)
    print("Welcome back!")
                return true
            else
    resetCursor(1, 1)
    print("Wrong password")
    return false
            end
        end
    end
 resetCursor(1, 1)
 print("User '"..username.."' does not exist")
 return false
end

local auth = false
resetCursor(1, 1)
while not auth do
    io.write("Username: ")
 local username = string.gsub(read(), "^ +", "")
 username = string.gsub(username, " +$", "")
    io.write("Password: ")
    local password = read("*")
 auth = verify_user(username, password)
 if not auth then
  sleep(2)
  resetCursor(1, 1)
 end
end

os.pullEvent = oldPull