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IdTokenFromServiceAccount.java
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IdTokenFromServiceAccount.java
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/*
* Copyright 2022 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// [START auth_cloud_idtoken_service_account]
import com.google.auth.oauth2.IdToken;
import com.google.auth.oauth2.IdTokenProvider.Option;
import com.google.auth.oauth2.ServiceAccountCredentials;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class IdTokenFromServiceAccount {
public static void main(String[] args)
throws IOException, ExecutionException, InterruptedException, GeneralSecurityException {
// TODO(Developer): Replace the below variables before running the code.
// *NOTE*:
// Using service account keys introduces risk; they are long-lived, and can be used by anyone
// that obtains the key. Proper rotation and storage reduce this risk but do not eliminate it.
// For these reasons, you should consider an alternative approach that
// does not use a service account key. Several alternatives to service account keys
// are described here:
// https://cloud.google.com/docs/authentication/external/set-up-adc
// Path to the service account json credential file.
String jsonCredentialPath = "path-to-json-credential-file";
// The url or target audience to obtain the ID token for.
String targetAudience = "http://www.abc.com";
getIdTokenFromServiceAccount(jsonCredentialPath, targetAudience);
}
public static void getIdTokenFromServiceAccount(String jsonCredentialPath, String targetAudience)
throws IOException {
// Initialize the Service Account Credentials class with the path to the json file.
ServiceAccountCredentials serviceAccountCredentials =
ServiceAccountCredentials.fromStream(new FileInputStream(jsonCredentialPath));
// Obtain the id token by providing the target audience.
// tokenOption: Enum of various credential-specific options to apply to the token. Applicable
// only for credentials obtained through Compute Engine or Impersonation.
List<Option> tokenOption = Arrays.asList();
IdToken idToken = serviceAccountCredentials.idTokenWithAudience(targetAudience, tokenOption);
// The following method can also be used to generate the ID token.
// IdTokenCredentials idTokenCredentials = IdTokenCredentials.newBuilder()
// .setIdTokenProvider(serviceAccountCredentials)
// .setTargetAudience(targetAudience)
// .build();
String token = idToken.getTokenValue();
System.out.println("Generated ID token.");
}
}
// [END auth_cloud_idtoken_service_account]