Class GoogleCredential (2.1.2)

Deprecated. Please use google-auth-library for handling Application Default Credentials and other non-OAuth2 based authentication.

Thread-safe Google-specific implementation of the OAuth 2.0 helper for accessing protected resources using an access token, as well as optionally refreshing the access token when it expires using a refresh token.

There are three modes supported: access token only, refresh token flow, and service account flow (with or without impersonating a user).

If all you have is an access token, you simply pass the TokenResponse to the credential using Builder#setFromTokenResponse(TokenResponse). Google credential uses BearerToken#authorizationHeaderAccessMethod() as the access method. Sample usage:

 public static GoogleCredential createCredentialWithAccessTokenOnly(TokenResponse tokenResponse) {
   return new GoogleCredential().setFromTokenResponse(tokenResponse);
 }
 

If you have a refresh token, it is similar to the case of access token only, but you additionally need to pass the credential the client secrets using Builder#setClientSecrets(GoogleClientSecrets) or Builder#setClientSecrets(String, String). Google credential uses GoogleOAuthConstants#TOKEN_SERVER_URL as the token server URL, and ClientParametersAuthentication with the client ID and secret as the client authentication. Sample usage:

 public static GoogleCredential createCredentialWithRefreshToken(
     HttpTransport transport, JsonFactory jsonFactory,
     GoogleClientSecrets clientSecrets, TokenResponse tokenResponse) {
  return new GoogleCredential.Builder().setTransport(transport)
                        .setJsonFactory(jsonFactory)
                        .setClientSecrets(clientSecrets)
                        .build()
                        .setFromTokenResponse(tokenResponse);
 }
 

The service account flow is used when you want to access data owned by your client application. You download the private key in a .p12 file from the Google APIs Console. Use Builder#setServiceAccountId(String), Builder#setServiceAccountPrivateKeyFromP12File(File), and Builder#setServiceAccountScopes(Collection). Sample usage:

 public static GoogleCredential createCredentialForServiceAccount(HttpTransport transport,
     JsonFactory jsonFactory,
     String serviceAccountId, Collection<String> serviceAccountScopes, File p12File)
     throws GeneralSecurityException, IOException {
   return new GoogleCredential.Builder().setTransport(transport).setJsonFactory(jsonFactory)
       .setServiceAccountId(serviceAccountId).setServiceAccountScopes(serviceAccountScopes)
       .setServiceAccountPrivateKeyFromP12File(p12File).build();
 }
 

You can also use the service account flow to impersonate a user in a domain that you own. This is very similar to the service account flow above, but you additionally call Builder#setServiceAccountUser(String). Sample usage:

 public static GoogleCredential createCredentialForServiceAccountImpersonateUser
     (HttpTransport transport, JsonFactory jsonFactory, String serviceAccountId,
      Collection<String> serviceAccountScopes, File p12File,
      String serviceAccountUser) throws GeneralSecurityException, IOException {
   return new GoogleCredential.Builder()
       .setTransport(transport)
       .setJsonFactory(jsonFactory)
       .setServiceAccountId(serviceAccountId)
       .setServiceAccountScopes(serviceAccountScopes)
       .setServiceAccountPrivateKeyFromP12File(p12File)
       .setServiceAccountUser(serviceAccountUser)
       .build();
 }
 

If you need to persist the access token in a data store, use DataStoreFactory and Builder#addRefreshListener(CredentialRefreshListener) with DataStoreCredentialRefreshListener.

If you have a custom request initializer, request execute interceptor, or unsuccessful response handler, take a look at the sample usage for HttpExecuteInterceptor and HttpUnsuccessfulResponseHandler, which are interfaces that this class also implements.

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Return a credential defined by a Json file.

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Return a credential defined by a Json file.

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Returns the Application Default Credentials.

Returns the Application Default Credentials which are credentials that identify and authorize the whole application. This is the built-in service account if running on Google Compute Engine or the credentials file from the path in the environment variable GOOGLE_APPLICATION_CREDENTIALS.

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Returns the Application Default Credentials.

Returns the Application Default Credentials which are credentials that identify and authorize the whole application. This is the built-in service account if running on Google Compute Engine or the credentials file from the path in the environment variable GOOGLE_APPLICATION_CREDENTIALS.

Constructor with the ability to access protected resources, but not refresh tokens.

To use with the ability to refresh tokens, use Builder.

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For service accounts that need to delegate to a specific user, create a copy of the credential with the specified user.

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For credentials that require scopes, creates a copy of the credential with the specified scopes.

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Indicates whether the credential requires scopes to be specified by calling createScoped before use.

Returns the service account ID (typically an e-mail address) or null if not using the service account flow.

Returns the private key to use with the service account flow or null if not using the service account flow.

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Returns the ID of the private key to use with the service account flow or null if not using the service account flow.

Returns the service account Project ID or null if not present, either because this is not using the service account flow, or is using an older version of the service account configuration.

Returns a collection of OAuth scopes to use with the service account flow or null if not using the service account flow.

Returns the space-separated OAuth scopes to use with the service account flow or null if not using the service account flow.

Returns the email address of the user the application is trying to impersonate in the service account flow or null for none or if not using the service account flow.

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Create a builder from this credential.