auth

-- cs authentication
-- prompt for login on startup

-- specify the authentication server
local authServer = "empty"

-- specify the authentication protocol
local authProtocol = "auth"

-- specify the local credentials
local localuser = "admin"
local localpass = "admin"

-- used to validate credentials with server
function validateCredentialsRemote(user, pass)
  -- detect and open modems
  for k, v in pairs(redstone.getSides()) do

  end
end

-- used to validate credentials locally
function validateCredentialsLocal(user, pass)
  if user == username and pass = password then
    local valid = true
  else
    local valid = false
  end

  return valid
end

-- continuously check for logins
while true do
  -- clear the terminal
  term.clear()
  term.setCursorPos(1, 1)
  -- print a welcome message
  print("CS AUTH SCRIPT\n")

  -- prompt the user for a username and password
  write("username> ")
  local username = read()
  write("password> ")
  local password = read()
  local credentials = {username, password}

  -- check if the auth server is reachable
  local serverid = rednet.lookup(authProtocol, authServer)
  -- authenticate with the server if reachable
  if serverid ~= nil then
    print("Found")
    local valid = validateCredentialsRemote(username, password)
  -- authenticate locally if the server is not found
  else
    print("Not found")
    local valid = validateCredentialsLocal(username, password)
  end

  -- launch a shell if the credentials are valid
  if valid == true then
    shell.run("/rom/programs/shell")
  else
    print("\nInvalid credentials. Press any key to continue...")
  end
end