Grape API example

api.rb

# This example API will recognize users that have authenticated via a web form, 
# but it fails authenticating from http_basic_auth, which has been enabled in Devise for this app
# curl -v -u "[email protected]:herpassword" http://localhost:3000/api/my_email

module MyApp
  class API < Grape::API
    prefix 'api'

    helpers do
      def warden
        env['warden']
      end

      def current_user
        warden.user
      end

      def authenticate!
        error!('401 Unauthorized', 401) unless current_user
      end
    end

    get 'hello' do
      {:hello => 'world'}
    end

    get 'my_email' do
      authenticate!
      current_user.email
    end
  end
end