Google Directory API returns Not Authorized when call users().list().execute()

Question

I need to read the list of users (and groups) from my google domain.

So I went to my Google APIs Console and enabled Admin SDK and created a

Answer 1

Google Directory API works with Compute Engine default service account, you do not need to setup Google Drive domain-wide. The only thing: you have to set serviceAccountUser, which is not supported in JSON based credentials. So you can

• use P12 keys
• user JSON credentials with workaround:

make credential copy:

import static com.google.api.client.googleapis.util.Utils.getDefaultJsonFactory;
import static com.google.api.client.googleapis.util.Utils.getDefaultTransport;

private static final String APPLICATION_NAME = "AnyAppName";

private final List SCOPES = ImmutableList.of(
        DirectoryScopes.ADMIN_DIRECTORY_GROUP_MEMBER, DirectoryScopes.ADMIN_DIRECTORY_USER, DirectoryScopes.ADMIN_DIRECTORY_GROUP);

private Directory service;

@PostConstruct
void init() throws GeneralSecurityException, IOException {
    GoogleCredential credential;
    try (InputStream is = new FileInputStream("./config/client_secret.json")) {
        credential = GoogleCredential.fromStream(is);
    }
    GoogleCredential credentialWithUser = new GoogleCredential.Builder()
            .setTransport(getDefaultTransport())
            .setJsonFactory(getDefaultJsonFactory())
            .setServiceAccountUser("admin@yourdomain.ru")  // <--- mail of domain's admin
            .setServiceAccountId(credential.getServiceAccountId())
            .setServiceAccountScopes(SCOPES)
            .setServiceAccountPrivateKey(credential.getServiceAccountPrivateKey())
            .setServiceAccountPrivateKeyId(credential.getServiceAccountPrivateKeyId())
            .setTokenServerEncodedUrl(credential.getTokenServerEncodedUrl()).build();

    service = new Directory.Builder(getDefaultTransport(), getDefaultJsonFactory(), credentialWithUser).setApplicationName(APPLICATION_NAME).build();
}

 public void members() throws IOException {
    Members members = service.members().list("groupName@yourdomain.ru").execute();
    System.out.println(members);
 }

For my trial G Suite account it works!