1 files changed, 28 insertions, 6 deletions
diff --git a/lib/gitlab/auth/omniauth_identity_linker_base.rb b/lib/gitlab/auth/omniauth_identity_linker_base.rb
index 4ed28d6a8be..ae365fcdfaa 100644
--- a/lib/gitlab/auth/omniauth_identity_linker_base.rb
+++ b/lib/gitlab/auth/omniauth_identity_linker_base.rb
@@ -6,19 +6,41 @@ module Gitlab
       def initialize(current_user, oauth)
         @current_user = current_user
         @oauth = oauth
-        @created = false
+        @changed = false
       end
 
-      def created?
-        @created
+      def link
+        save if identity.new_record?
+      end
+
+      def changed?
+        @changed
       end
 
       def error_message
-        ''
+        identity.validate
+
+        identity.errors.full_messages.join(', ')
+      end
+
+      private
+
+      def save
+        @changed = identity.save
+      end
+
+      def identity
+        @identity ||= current_user.identities
+                                  .with_extern_uid(provider, uid)
+                                  .first_or_initialize(extern_uid: uid)
+      end
+
+      def provider
+        oauth['provider']
       end
 
-      def create_or_update
-        raise NotImplementedError
+      def uid
+        oauth['uid']
       end
     end
   end