app.rb

require 'rubygems'
require 'sinatra/base'
require 'yaml'

require 'pusher'
require 'twilio-ruby'

class App < Sinatra::Base

  set :public_folder, Proc.new { File.join(root, "public") }
  
  config = YAML.load_file('./config.yml')
  
  Pusher.app_id = config['pusher']['app_id']
  Pusher.key = config['pusher']['app_key']
  Pusher.secret = config['pusher']['app_secret']
  
  before do
    @twilio = Twilio::REST::Client.new config['twilio']['account_sid'], config['twilio']['auth_token']
  end
  
  def active_calls
    conference = @twilio.account.conferences.list(status:"in-progress",friendly_name:"moscow").first
    if conference.nil?
      return []
    end
    conference.participants.list.map do |p|
      c = @twilio.account.calls.get(p.call_sid)
      {from: c.from, start_time:c.start_time}
    end
  end
  
  get '/' do
    @app_key = config['pusher']['app_key']
    erb :index
  end
  
  post '/call' do
    if( params['AccountSid'] != config['twilio']['account_sid'] )
      status 401
    else
      c = active_calls
      c << {from: params['From'], start_time:Time.now}
      Pusher['calls'].trigger('call_incoming', c)
      response = Twilio::TwiML::Response.new do |r|
        r.Dial do |d|
          d.Conference 'moscow', muted:true, startConferenceOnEnter:false
        end
      end
      content_type 'text/xml'
      response.to_xml
    end
  end
  
  post '/callstatus' do
    if( params['AccountSid'] != config['twilio']['account_sid'] )
      status 401
    else
      c = active_calls
      Pusher['calls'].trigger('call_incoming', c)
    end
  end
  
  post '/sms' do
    if( params['AccountSid'] != config['twilio']['account_sid'] )
      status 401
    else
      Pusher['sms'].trigger('sms_received', {
        :from_number => '...' + params['From'][-4, 4],
        :timestamp => Time.now.strftime("%Y-%m-%dT%H:%M:%S"),
        :text => params['Body']
      })
    end
  end
    
  run! if app_file == $0

end