Contents

# encoding: utf-8

require 'koala'

module DeviseFacebookOpenGraph
  module Facebook
    class Session
      #
      # Keys found in cookie content. We are supplying reader 
      # methods for these values which are read from cookie content
      #
      FACEBOOK_SESSION_KEYS = %w(session_key expires uid sig secret access_token)

      def self.new_or_nil_if_invalid(cookies)
        session = new(cookies)
        return session if session.valid?
      end

      #
      # Creates a new Facebook session based cookies hash from a request
      #
      def initialize(cookies)
        @cookies = cookies
      end

      #
      # Returns facebook's cookie content
      #
      def cookie_content
        @cookie_content ||= parse_cookie
      end
      
      #
      # Gives access to query as user with an oauth access token fetched from the cookie content
      #
      def graph
        Koala::Facebook::GraphAPI.new(access_token)
      end


      #
      # Define reader methods for facebook session keys
      #
      FACEBOOK_SESSION_KEYS.each do |key|
        define_method key do
          cookie_content[key] if cookie_content
        end
      end

      #
      # Is this a valid session? True if we were able to parse facebook's cookie content
      #
      def valid?
        !!cookie_content
      end
      
      private
        def parse_cookie # :nodoc:
          oauth = Koala::Facebook::OAuth.new(Config.application_id, Config.application_secret)
          user_information_hash = oauth.get_user_info_from_cookie(@cookies)
          
          if user_information_hash.present? && !user_information_hash.is_a?(Hash)
            raise "Expected get_user_info_from_cookie to return a Hash. Got #{user_information_hash.class}"
          end

          user_information_hash
        end
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
devise_facebook_open_graph-0.0.6	lib/devise_facebook_open_graph/facebook/session.rb
devise_facebook_open_graph-0.0.5	lib/devise_facebook_open_graph/facebook/session.rb
devise_facebook_open_graph-0.0.4	lib/devise_facebook_open_graph/facebook/session.rb