서로 다른 ID 시스템 동기화

/**
 * Sample for mapping permissions from a source repository to Cloud Search
 * ACLs. In this example, POSIX file permissions are used a the source
 * permissions.
 *
 * @return Acl
 * @throws IOException if unable to read file permissions
 */
static Acl mapPosixFilePermissionToCloudSearchAcl(Path pathToFile) throws IOException {
  // Id of the identity source for external user/group IDs. Shown here,
  // but may be omitted in the SDK as it is automatically applied
  // based on the `api.identitySourceId` configuration parameter.
  String identitySourceId = "abcdef12345";

  // Retrieve the file system permissions for the item being indexed.
  PosixFileAttributeView attributeView = Files.getFileAttributeView(
      pathToFile,
      PosixFileAttributeView.class,
      LinkOption.NOFOLLOW_LINKS);

  if (attributeView == null) {
    // Can't read, return empty ACl
    return new Acl.Builder().build();
  }

  PosixFileAttributes attrs = attributeView.readAttributes();
  // ...
}

// Owner, for search quality.
// Note that for principals the name is not the primary
// email address in Cloud Directory, but the local ID defined
// by the OS. Users and groups must be referred to by their
// external ID and mapped via an identity source.
List<Principal> owners = Collections.singletonList(
    Acl.getUserPrincipal(attrs.owner().getName(), identitySourceId)
);

// List of users to grant access to
List<Principal> readers = new ArrayList<>();

// Add owner, group, others to readers list if permissions
// exist. For this example, other is mapped to everyone
// in the organization.
Set<PosixFilePermission> permissions = attrs.permissions();
if (permissions.contains(PosixFilePermission.OWNER_READ)) {
  readers.add(Acl.getUserPrincipal(attrs.owner().getName(), identitySourceId));
}
if (permissions.contains(PosixFilePermission.GROUP_READ)) {
  String externalGroupName = attrs.group().getName();
  Principal group = Acl.getGroupPrincipal(externalGroupName, identitySourceId);
  readers.add(group);
}
if (permissions.contains(PosixFilePermission.OTHERS_READ)) {
  Principal everyone = Acl.getCustomerPrincipal();
  readers.add(everyone);
}

// Build the Cloud Search ACL. Note that inheritance of permissions
// from parents is omitted. See `setInheritFrom()` and `setInheritanceType()`
// methods on the builder if required by your implementation.
Acl acl = new Acl.Builder()
    .setReaders(readers)
    .setOwners(owners)
    .build();

String namespace = "identitysources/" + idSource;
Group group = new Group()
    .setGroupKey(new EntityKey().setNamespace(namespace).setId(groupId))
    .setDescription("Demo group")
    .setDisplayName(groupName)
    .setLabels(Collections.singletonMap("system/groups/external", ""))
    .setParent(namespace);
try {
  CloudIdentity service = Utils.buildCloudIdentityService();
  Operation createOperation = service.groups().create(group).execute();

  if (createOperation.getDone()) {
    // Note: The response contains the data for a Group object, but as
    // individual fields. To convert to a Group instance, either populate
    // the fields individually or serialize & deserialize to/from JSON.
    //
    // Example:
    // String json = service.getJsonFactory().toString(response);
    // Group createdGroup =  service.getObjectParser()
    //     .parseAndClose(new StringReader(json), Group.class);
    System.out.printf("Group: %s\n",
        createOperation.getResponse().toString());
  } else {
    // Handle case where operation not yet complete, poll for
    // completion. API is currently synchronous and all operations return
    // as completed.
    // ...
  }
} catch (Exception e) {
  System.err.printf("Unable to create group: %s", e.getMessage());
  e.printStackTrace(System.err);
}

if (permissions.contains(PosixFilePermission.GROUP_READ)) {
  String externalGroupName = attrs.group().getName();
  Principal group = Acl.getGroupPrincipal(externalGroupName, identitySourceId);
  readers.add(group);
}