Support logout

app/controllers/sessions_controller.rb

@@ -1,6 +1,6 @@
 class SessionsController < ApplicationController
   skip_before_filter :ensure_authenticated
-  protect_from_forgery except: [:new, :create, :failure]
+  protect_from_forgery except: [:new, :create, :failure, :destroy]
 
   def new
     redirect_to '/auth/g'
@@ -20,6 +20,11 @@ def create
     end
   end
 
+  def destroy
+    logout
+    redirect_to root_path
+  end
+
   def failure
     render :inline => 'Snowman says no. <div id="snowman" style="text-align:center; font-size:4000%;">&#9731;</div>'
   end

config/routes.rb

@@ -2,4 +2,5 @@
   get '/login', :to => 'sessions#new', :as => :login
   post '/auth/g/callback', :to => 'sessions#create'
   post '/auth/failure', :to => 'sessions#failure'
+  delete '/logout', :to => 'sessions#destroy', :as => :logout
 end

lib/google_auth/controller.rb

@@ -19,5 +19,10 @@ def ensure_authenticated
       end
     end
 
+    def logout
+      session[:user_id] = nil
+      @current_user = nil
+    end
+
   end
 end