Bring controller helper auth from spree

lib/spree/core/controller_helpers/auth.rb

@@ -0,0 +1,73 @@
+module Spree
+  module Core
+    module ControllerHelpers
+      module Auth
+        extend ActiveSupport::Concern
+
+        included do
+          before_filter :ensure_api_key
+          helper_method :try_spree_current_user
+
+          rescue_from CanCan::AccessDenied do |exception|
+            unauthorized
+          end
+        end
+
+        # Needs to be overriden so that we use Spree's Ability rather than anyone else's.
+        def current_ability
+          @current_ability ||= Spree::Ability.new(try_spree_current_user)
+        end
+
+        # Redirect as appropriate when an access request fails.  The default action is to redirect to the login screen.
+        # Override this method in your controllers if you want to have special behavior in case the user is not authorized
+        # to access the requested action.  For example, a popup window might simply close itself.
+        def unauthorized
+          if try_spree_current_user
+            flash[:error] = Spree.t(:authorization_failure)
+            redirect_to '/unauthorized'
+          else
+            store_location
+            redirect_to respond_to?(:spree_login_path) ? spree_login_path : spree.root_path
+          end
+        end
+
+        def store_location
+          # disallow return to login, logout, signup pages
+          authentication_routes = [:spree_signup_path, :spree_login_path, :spree_logout_path]
+          disallowed_urls = []
+          authentication_routes.each do |route|
+            if respond_to?(route)
+              disallowed_urls << send(route)
+            end
+          end
+
+          disallowed_urls.map!{ |url| url[/\/\w+$/] }
+          unless disallowed_urls.include?(request.fullpath)
+            session['spree_user_return_to'] = request.fullpath.gsub('//', '/')
+          end
+        end
+
+        # proxy method to *possible* spree_current_user method
+        # Authentication extensions (such as spree_auth_devise) are meant to provide spree_current_user
+        def try_spree_current_user
+          respond_to?(:spree_current_user) ? spree_current_user : nil
+        end
+
+        def redirect_back_or_default(default)
+          redirect_to(session["spree_user_return_to"] || default)
+          session["spree_user_return_to"] = nil
+        end
+
+        # Need to generate an API key for a user due to some actions potentially
+        # requiring authentication to the Spree API
+        def ensure_api_key
+          if user = try_spree_current_user
+            if user.respond_to?(:spree_api_key) && user.spree_api_key.blank?
+              user.generate_spree_api_key!
+            end
+          end
+        end
+      end
+    end
+  end
+end