// Copyright 2020 Google LLC // 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. package com.google.cloud.broker.apps.brokerserver.accesstokens.providers; import java.io.IOException; import java.util.List; import com.google.auth.oauth2.GoogleCredentials; import com.google.auth.oauth2.ImpersonatedCredentials; import io.grpc.Status; import com.google.cloud.broker.apps.brokerserver.accesstokens.AccessToken; public class ServiceAccountProvider extends AbstractProvider { @Override public AccessToken getAccessToken(String googleIdentity, List<String> scopes) { if (! googleIdentity.endsWith(".iam.gserviceaccount.com")) { throw new IllegalArgumentException("Google identity `" + googleIdentity + "` is not a service account"); } try { GoogleCredentials credentials = GoogleCredentials.getApplicationDefault(); ImpersonatedCredentials impersonatedCredentials = ImpersonatedCredentials.create(credentials, googleIdentity, null, scopes, 3600); com.google.auth.oauth2.AccessToken token = impersonatedCredentials.refreshAccessToken(); return new AccessToken(token.getTokenValue(), token.getExpirationTime().getTime()); } catch (IOException e) { throw Status.PERMISSION_DENIED.asRuntimeException(); } } }