jabber.rb

module Jabber
  def self.read
    size = $stdin.read(2).unpack(">h")
    $stdin.read(size).split(':')
  end
  
  def self.write(success)
    answer = success ? 1 : 0
    token = "2#{answer}".pack(">hh")
    $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

python.py

def from_ejabberd():
    input_length = sys.stdin.read(2)
    (size,) = unpack('>h', input_length)
    return sys.stdin.read(size).split(':')

def to_ejabberd(bool):
    answer = 0
    if bool:
        answer = 1
    token = pack('>hh', 2, answer)
    sys.stdout.write(token)
    sys.stdout.flush()

ruby.rb

def self.read
  size = $stdin.read(2).unpack(">h")
  $stdin.read(size).split(':')
end

def self.write(success)
  answer = success ? 1 : 0
  token = "2#{answer}".pack(">hh")
  $stdout.write(token)
  $stdout.flush
end