docs: public static IAuthorizationPrincipal principalFromUser(final IPerson user) {
  
          Validate.notNull(user, "Cannot determine an authorization principal for null user.");
  
          final EntityIdentifier userEntityIdentifier = user.getEntityIdentifier();
          Validate.notNull(user, "The user object is defective: lacks entity identifier.");
  
          final String userEntityKey = userEntityIdentifier.getKey();
          Validate.notNull(userEntityKey, "The user object is defective: lacks entity key.");
          final Class userEntityType = userEntityIdentifier.getType();
          Validate.notNull(userEntityType, "The user object is defective: lacks entity type.");
  
          final IAuthorizationPrincipal principal =
                  AuthorizationServiceFacade.instance().newPrincipal(userEntityKey, userEntityType);
  
          return principal;
      }