jabber.rb

module Jabber
  def self.read
    size = $stdin.read(2).unpack("n").first
    $stdin.read(size).split(':')
  end
  
  def self.write(success)
    answer = success ? 1 : 0
    token = [2, answer].pack("nn")
    $stdout.write(token)
    $stdout.flush
  end
  
  def self.auth(uname, server, pass)
    uname == "vanpelt"
  end
  
  def self.isuser(uname, server)
    uname == "vanpelt"
  end
  
  def self.setpass(uname, server, pass)
    false
  end
end

while true do
  data = Jabber.read
  success = case data[0]
  when "auth": Jabber.auth(*data[1,3])
  when "isuser": Jabber.isuser(*data[1,2])
  when "setpass": Jabber.setpass(*data[1,3])
  else false
  end
  Jabber.write(success)
end