Use new OAuth classes

app/controllers/omniauth_callbacks_controller.rb

@@ -18,33 +18,39 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
   def ldap
     # We only find ourselves here
     # if the authentication to LDAP was successful.
-    @user = Gitlab::LDAP::User.find_or_create(request.env["omniauth.auth"])
+    @user = Gitlab::LDAP::User.find_or_create(oauth)
     @user.remember_me = true if @user.persisted?
-
     sign_in_and_redirect(@user)
   end
   private
   def handle_omniauth
-    oauth = request.env['omniauth.auth']
-    provider, uid = oauth['provider'], oauth['uid']
-
     if current_user
       # Change a logged-in user's authentication method:
-      current_user.extern_uid = uid
-      current_user.provider = provider
+      current_user.extern_uid = oauth['uid']
+      current_user.provider = oauth['provider']
       current_user.save
       redirect_to profile_path
     else
-      @user = User.find_or_new_for_omniauth(oauth)
+      @user = Gitlab::OAuth::User.find(oauth)
+
+      # Create user if does not exist
+      # and allow_single_sign_on is true
+      if Gitlab.config.omniauth['allow_single_sign_on']
+        @user ||= Gitlab::OAuth::User.create(oauth)
+      end
       if @user
-        sign_in_and_redirect @user
+        sign_in_and_redirect(@user)
       else
         flash[:notice] = "There's no such user!"
         redirect_to new_user_session_path
       end
     end
   end
+
+  def oauth
+    @oauth ||= request.env['omniauth.auth']
+  end
 end