Sinatra based Github hook that sends commit information to a Jabber chat room

github_jabber_hook.rb

require 'rubygems'
require 'sinatra'
require 'xmpp4r'
require 'xmpp4r/muc'
require 'json'

CONFIG = YAML.load_file('config.yml')

jid = Jabber::JID::new(CONFIG['user_jid'])
client = Jabber::Client::new(jid)
client.connect(CONFIG['host'])
client.auth(CONFIG['user_password'])
muc = Jabber::MUC::SimpleMUCClient.new(client)
muc.join(Jabber::JID.new(CONFIG['muc_jid']))

before do
  if CONFIG.keys.include?('prefix')
    request.path_info = request.path_info.gsub(/^#{CONFIG['prefix']}/, '')
  end
end

post '/' do
  payload = JSON.parse(params[:payload])

  return unless payload.keys.include?('repository')
  repo = payload['repository']['name']

  payload['commits'].each do |c|
    muc.say("#{repo}\n#{c['author']['name']}\n#{c['url']}\n#{c['message']}")
  end

  200
end