Simple api token authentication

gistfile1.txt

class ApplicationController < ActionController::Base
  protect_from_forgery

  respond_to :json

  before_filter :authorize_user!

  helper_method :current_user
  def current_user
    @current_user
  end

private
  def authorize_user!
    @current_user ||= User.find_by_token params[:token]
    render nothing: true, status: 401 unless @current_user
  end
end