From bf3af8f8a444365f3040da2928837986409fa016 Mon Sep 17 00:00:00 2001
From: Stefan Wintermeyer <stefan.wintermeyer@amooma.de>
Date: Tue, 29 Jan 2013 18:43:06 +0100
Subject: Single Sign On via a ENV['USER_NAME'] mechanism.

---
 app/controllers/application_controller.rb | 18 ++++++++++++++----
 db/migrate/20130129154700_add_sso_key.rb  |  9 +++++++++
 db/schema.rb                              |  2 +-
 3 files changed, 24 insertions(+), 5 deletions(-)
 create mode 100644 db/migrate/20130129154700_add_sso_key.rb

diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 2d49890..2aadf19 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -122,11 +122,21 @@ class ApplicationController < ActionController::Base
   private  
   
   def current_user
-    if session[:user_id] && User.where(:id => session[:user_id]).any?
-      return User.where(:id => session[:user_id]).first
+    if session[:user_id] || GsParameter.get('SingleSignOnEnvUserNameKey').blank?
+      if session[:user_id] && User.where(:id => session[:user_id]).any?
+        return User.where(:id => session[:user_id]).first
+      else
+        session[:user_id] = nil
+        return nil
+      end
     else
-      session[:user_id] = nil
-      return nil
+      if User.where(:user_name => request.env[GsParameter.get('SingleSignOnEnvUserNameKey')]).any?
+        auth_user = User.where(:user_name => request.env[GsParameter.get('SingleSignOnEnvUserNameKey')]).first
+        session[:user_id] = auth_user.id
+        return auth_user
+      else
+        return nil
+      end
     end
   end  
   
diff --git a/db/migrate/20130129154700_add_sso_key.rb b/db/migrate/20130129154700_add_sso_key.rb
new file mode 100644
index 0000000..2e47f39
--- /dev/null
+++ b/db/migrate/20130129154700_add_sso_key.rb
@@ -0,0 +1,9 @@
+class AddSsoKey < ActiveRecord::Migration
+  def up
+    GsParameter.create(:name => 'SingleSignOnEnvUserNameKey', :section => 'Generic', :value => '', :class_type => 'Nil', :description => 'When set to a string this env variable will be used to authenticate the user. e.g. REMOTE_USER')
+  end
+
+  def down
+  	GsParameter.create(:name => 'SingleSignOnEnvUserNameKey').destroy_all
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 7bae5fd..e1bed77 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130128121800) do
+ActiveRecord::Schema.define(:version => 20130129154700) do
 
   create_table "access_authorizations", :force => true do |t|
     t.string   "access_authorizationable_type"
-- 
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