FacebookSession

FacebookSession is a simple Rails plugin that complements the Facebook Javascript SDK. It is capable of loading the API, handling Facebook logins and parsing signed requests.

Add it to your Gemfile and run bundle install:

gem 'facebook_session'

Then run the generator:

rails g facebook_session:install

The default configuration relies on two environment variables being set, FACEBOOK_APPLICATION_ID and FACEBOOK_APPLICATION_SECRET.

If you'd like, you can configure these directly in config/initializers/facebook_session.rb:

FacebookSession.configure(
  application_id:     '12345678',
  application_secret: 'myapplication_secret'
)

Requiring facebook_session in your assets pipeline will automatically load the Facebook JS SDK asynchronously. It will also make sure it works between page loads if you have Turbolinks enabled.

//= require facebook_session

It also provides a method named window.withFacebookAPI that takes a function and runs it as soon as the Facebook SDK is available (or immediately if it's already loaded).

Example (in CoffeeScript):

$('.my-button').click -> withFacebookAPI -> FB.login(...)

You can skip loading the facebook_session script if you already have the SDK set up.

In your controllers, helpers and views, you can now do:

if facebook_session?
  facebook_session.user_id # => Facebook user ID
end

if facebook_signed_request?
  logger.info facebook_signed_request.app_data
end

Copyright (c) 2012 Manual design. See LICENSE for details.