zammad/lib/facebook_database.rb

class FacebookDatabase < OmniAuth::Strategies::Facebook
  option :name, 'facebook'

  def initialize(app, *args, &block)

    # database lookup
#        puts 'FacebookDatabase -> initialize'
    config = Setting.get('auth_facebook_credentials') || {}
    args[0] = config['app_id']
    args[1] = config['app_secret']
    super
  end

end