public Response apply()

in src/main/java/com/googlesource/gerrit/plugins/serviceuser/PutOwner.java [91:138]
44 lines of code
10 McCabe index (conditional complexity)

  public Response<GroupInfo> apply(ServiceUserResource rsrc, Input input)
      throws RestApiException, IOException, PermissionBackendException {
    Boolean ownerAllowed;
    try {
      ownerAllowed = getConfig.get().apply(new ConfigResource()).value().allowOwner;
    } catch (Exception e) {
      throw asRestApiException("Cannot get configuration", e);
    }
    if ((ownerAllowed == null || !ownerAllowed)) {
      permissionBackend.user(self.get()).check(ADMINISTRATE_SERVER);
    }

    if (input == null) {
      input = new Input();
    }

    GroupDescription.Basic group = null;
    String oldGroup;
    try (MetaDataUpdate md = metaDataUpdateFactory.create(allProjects)) {
      ProjectLevelConfig.Bare update = configProvider.get();
      update.load(md);

      Config db = update.getConfig();
      oldGroup = db.getString(USER, rsrc.getUser().getUserName().get(), KEY_OWNER);
      if (Strings.isNullOrEmpty(input.group)) {
        db.unset(USER, rsrc.getUser().getUserName().get(), KEY_OWNER);
      } else {
        group =
            groups.parse(TopLevelResource.INSTANCE, IdString.fromDecoded(input.group)).getGroup();
        UUID groupUUID = group.getGroupUUID();
        if (!AccountGroup.uuid(groupUUID.get()).isInternalGroup()) {
          throw new MethodNotAllowedException("Group with UUID '" + groupUUID + "' is external");
        }
        db.setString(USER, rsrc.getUser().getUserName().get(), KEY_OWNER, groupUUID.get());
      }
      md.setMessage("Set owner for service user '" + rsrc.getUser().getUserName() + "'\n");
      update.commit(md);
      storageCache.invalidate();
    } catch (ConfigInvalidException e) {
      throw asRestApiException("Invalid configuration", e);
    }

    return group != null
        ? (oldGroup != null
            ? Response.ok(json.format(group))
            : Response.created(json.format(group)))
        : Response.<GroupInfo>none();
  }