Facebooker2
===========

Provides rails helpers for interfacing with Facebook's OpenGraph Javascript
API, http://developers.facebook.com/docs/reference/javascript/.

Requires the mogli gem.


Example
=======

0. Prerequisite: You need a facebook app.  Have your API Key, Application
Secret, and Application ID handy.

1. Install facebooker2 as a plugin in your rails app.

2. Create config/facebooker.yml with the appropriate environment.

production:
  app_id: <your application id>
  secret: <your application secret>
  api_key: <your application key>

3. Create config/initializers/facebooker2.rb and place the following line in it

Facebooker2.load_facebooker_yaml

4. Add the following line to your app/controllers/application_controller.rb

include Facebooker2::Rails::Controller

5. Update your rails applications to use the rails helpers.  This could be in a
shared login partial.

<%= fb_connect_async_js %>
<% if current_facebook_user %>
   <%= "Welcome #{current_facebook_user.first_name} #{current_facebook_user.last_name}!" %>
   or
   <%= "Hello #{fb_name(current_facebook_user, :useyou => false)}!" # link to facebook profile
    %>
  <%= fb_logout_link("Logout of fb", request.url) %><br />
<% else
   # you must explicitly request permissions for facebook user fields.
   # here we instruct facebook to ask the user for permission for our website
   # to access the user's facebook email and birthday
   %>
  <%= fb_login_and_redirect('<your URL here>', :perms => 'email,user_birthday') %>
<% end %>

Using with Canvas Applications
==============================

To improve integration with Facebook and iframe canvas applications, the primary goal
being things like FB.ui work as a dialog rather than a popup, the application
needs to be authenticated against the user's account via OAuth before use.

0. Prerequisite: You need a Facebook app. Have your canvas page name handy.

1. Install facebooker2.

2. Create config/facebooker.yml as above, but add the following key:

production:
  canvas_page_name: <your canvas page name>

3. Add the following lines to your app/controllers/application_controller.rb

include Facebooker2::Rails::Controller::CanvasOAuth

ensure_canvas_connected_to_facebook :oauth_url, 'publish_stream'
create_facebook_oauth_callback :oauth

rescue_from Facebooker2::OAuthException do |exception|
  redirect_to 'http://www.facebook.com/'
end

4. Create a route that generates a URL for the OAuth callback and calls the appropriate
action on your controller:

map.oauth '/oauth', :controller => :application, :action => :oauth

5. Your canvas application will now ensure that the current user has authorized
the application before anything else is allowed.  The authorization and FB.ui dialogs
will appear inline instead of as popups, improving user experience.

Copyright (c) 2010 Mike Mangino, released under the MIT license
Copyright (c) 2010 John Bintz, released under the MIT license