Add CAS specifc methods to user model

app/models/user.rb

@@ -616,6 +616,14 @@ def ldap_identity
     @ldap_identity ||= identities.find_by(["provider LIKE ?", "ldap%"])
   end
 
+  def cas_user?
+    identities.exists?(["provider = ? AND extern_uid IS NOT NULL", "cas3"])
+  end
+
+  def cas_identity
+    @cas_identity ||= identities.find_by(["provider = ?", "cas3"])
+  end
+
   def project_deploy_keys
     DeployKey.unscoped.in_projects(self.authorized_projects.pluck(:id)).distinct(:id)
   end