Use CanCanCan for directions controller

app/abilities/ability.rb

@@ -6,6 +6,7 @@ class Ability
   def initialize(user)
     can [:relation, :relation_history, :way, :way_history, :node, :node_history, :changeset, :note], :browse
     can :index, ChangesetComment
+    can :search, :direction
     can [:index, :permalink, :edit, :help, :fixthemap, :offline, :export, :about, :preview, :copyright, :key, :id], :site
     can [:index, :rss, :show, :comments], DiaryEntry
     can [:finish, :embed], :export

app/controllers/directions_controller.rb

@@ -2,6 +2,7 @@ class DirectionsController < ApplicationController
   before_action :authorize_web
   before_action :set_locale
   before_action :require_oauth, :only => [:search]
+  authorize_resource :class => false
 
   def search
     render :layout => map_layout