Grape API authentication methods

auth.rb

module API
  class Auth < Grape::API
    # /api/auth
    resource :auth do
   
      #
      # auth code goes here!
      #

      desc "Returns pong if logged in correctly."
      params do
        requires :token, :type => String, :desc => "Access token."
      end
      get :ping do
        authenticate!
        { :message => "pong" }
      end
    end
  end
end