Custom auth header for ActiveResource requests

app_auth_headers.rb

class AppAuthHeaders
  
  cattr_accessor :remember_token
  
  def self.headers
    remember_token.blank? ? {"Authorization" => ""} : {"Authorization" => "RememberToken #{self.remember_token}"}
  end
end

application.rb

require File.expand_path('../boot', __FILE__)

require 'rails/all'

Bundler.require(:default, Rails.env) if defined?(Bundler)

module MyApp
  class Application < Rails::Application

    # some configuration   

    # Custom directories with classes and modules you want to be autoloadable.
    config.autoload_paths += %W(#{config.root}/app/extensions)

    # some other configuration   

  end
end

custom_auth_header.rb

module CustomAuthHeader
  def self.included(klass)
    class << klass 
      def headers_with_authorization
        default_headers = headers_without_authorization
        AppAuthHeaders.headers.keys.each {|key| default_headers.delete(key) }
        default_headers.reverse_merge!(EngineAuthHeaders.headers)
      end
      
      alias_method_chain :headers, :authorization
    end
  end
end

ActiveResource::Base.send(:include, CustomAuthHeader)