social_proxy.rb

class SocialProxy < SimpleDelegator
  attr_reader :auth

  def initialize(auth)
    @auth = auth
    @provider = auth.provider.to_sym

    case @provider
    when :facebook then require 'koala'
    when :twitter  then require 'twitter'
    end

    super send(@provider) if respond_to?(@provider, true)
  end

  def exchange_facebook_token
    oauth = Koala::Facebook::OAuth.new ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_APP_SECRET']
    oauth.exchange_access_token(auth.token)
  end

  private

  def facebook
    Koala::Facebook::API.new auth.token
  end

  def twitter
    Twitter::REST::Client.new do |config|
      config.consumer_key = ENV['TWITTER_CONSUMER_KEY']
      config.consumer_secret = ENV['TWITTER_CONSUMER_SECRET']
      config.access_token = auth.token
      config.access_token_secret = auth.secret
    end
  end
end