socialforge/app/api/mobile/api.rb

module Mobile

  class API < Grape::API
    version 'v1', using: :path
    format :json
    content_type :json, "application/json;charset=UTF-8"

    helpers do
      def logger
        API.logger
      end

      def authenticate!
        error!('Unauthorized. Invalid or expired token.', 401) unless current_user
      end

      def current_user
        token = ApiKey.where(access_token: params[:token]).first
        if token && !token.expired?
          @current_user = User.find(token.user_id)
        else
          nil
        end
      end
    end

    mount Apis::Auth
    mount Apis::Users
    mount Apis::Courses

  end
end