#  Tiny Twitter Bot.
#
require 'rubygems'
require 'xmpp4r'
require 'kconv'
 
class Reciever
  attr_accessor :client
 
  # user : Jabber ID
  # pass : Password
  def initialize(user, pass)
    @end = false
    Jabber::debug = true
 
    # connect Jabber client to the Server
    @client = Jabber::Client.new(Jabber::JID.new(user), false)
    @client.connect
    @client.auth(pass)
    @client.send(Jabber::Presence::new)
 
    thread = Thread.current
 
    # a callback to parse recieved messages
    @client.add_message_callback do |message|
      unless message.type == :error
        if message.body =~ /Direct from (.*):/ # who sends DirectMessage ?
          sender = $1
          msg = message.body.split(/\r?\n/)
          msg.shift # cut Direct from ...
          msg.pop # cut last line, too
          body = msg.join
 
          #
          # do whatever you like in following lines :)
          #
          if body =~ /!abort/ # finish if told 'abort'
            @client.send(Jabber::Message::new(message.from, "d #{sender} aborting...").set_type(:chat))
            thread.wakeup
          else
            # it just echoes in this example
            xxx = Kconv.toutf8("d #{sender}\n#{message.body}")
            @client.send(Jabber::Message::new(message.from, xxx).set_type(:chat))
          end # if body
        end # if direct
      end # unless error
    end # callback
 
    @watcher = Thread.new do
      while not @end
        # saying "I'm alive!" to the Jabber server
        @client.send(Jabber::Presence::new)
        sleep 30
      end
    end
  end
 
  def close
    @client.close
    @end = true
    @watcher.join
  end
end # Reciever

#!/opt/local/bin/ruby
require 'open-uri'
 
ID = 'jabber bot ID'
PASSWORD = 'jabber bot password'
 
msg = ARGF.read
msg =~ /\s+http:\/\/twitter.com\/(\w+)$/
screen_name = $1
exit 1 unless screen_name
 
auth = {'Authorization' => 'Basic '+[ID+':'+PASSWORD].pack('m')}
open('http://twitter.com/friendships/create/'+screen_name+'.json', auth)