content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.examples.complete.game.injector;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkNotNull;
  
  import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
  import com.google.api.client.googleapis.json.GoogleJsonResponseException;
  import com.google.api.client.googleapis.util.Utils;
  import com.google.api.client.http.HttpRequestInitializer;
  import com.google.api.client.http.HttpStatusCodes;
  import com.google.api.client.http.HttpTransport;
  import com.google.api.client.json.JsonFactory;
  import com.google.api.services.pubsub.Pubsub;
  import com.google.api.services.pubsub.PubsubScopes;
  import com.google.api.services.pubsub.model.Topic;
  import java.io.IOException;
  
  class InjectorUtils {
  
    private static final String APP_NAME = "injector";
  
    /** Builds a new Pubsub client and returns it. */
    public static Pubsub getClient(final HttpTransport httpTransport, final JsonFactory jsonFactory)
        throws IOException {
      checkNotNull(httpTransport);
      checkNotNull(jsonFactory);
      GoogleCredential credential =
          GoogleCredential.getApplicationDefault(httpTransport, jsonFactory);
      if (credential.createScopedRequired()) {
        credential = credential.createScoped(PubsubScopes.all());
      }
      if (credential.getClientAuthentication() != null) {
        System.out.println(
            "\n***Error! You are not using service account credentials to "
                + "authenticate.\nYou need to use service account credentials for this example,"
                + "\nsince user-level credentials do not have enough pubsub quota,\nand so you will run "
                + "out of PubSub quota very quickly.\nSee "
                + "https://developers.google.com/identity/protocols/application-default-credentials.");
        System.exit(1);
      }
      HttpRequestInitializer initializer = new RetryHttpInitializerWrapper(credential);
      return new Pubsub.Builder(httpTransport, jsonFactory, initializer)
          .setApplicationName(APP_NAME)
          .build();
    }
  
    /** Builds a new Pubsub client with default HttpTransport and JsonFactory and returns it. */
    public static Pubsub getClient() throws IOException {
      return getClient(Utils.getDefaultTransport(), Utils.getDefaultJsonFactory());
    }
  
    /** Returns the fully qualified topic name for Pub/Sub. */
    public static String getFullyQualifiedTopicName(final String project, final String topic) {
      return String.format("projects/%s/topics/%s", project, topic);
    }
  
    /** Create a topic if it doesn't exist. */
    public static void createTopic(Pubsub client, String fullTopicName) throws IOException {
      System.out.println("fullTopicName " + fullTopicName);
      try {
        client.projects().topics().get(fullTopicName).execute();
      } catch (GoogleJsonResponseException e) {
        if (e.getStatusCode() == HttpStatusCodes.STATUS_CODE_NOT_FOUND) {
          Topic topic = client.projects().topics().create(fullTopicName, new Topic()).execute();
          System.out.printf("Topic %s was created.%n", topic.getName());
        }
      }
    }
  }
  