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.camel.component.google.drive;
  
  import java.util.Collection;
  
  import com.google.api.client.auth.oauth2.Credential;
  import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
  import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
  import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
  import com.google.api.client.http.javanet.NetHttpTransport;
  import com.google.api.client.json.jackson2.JacksonFactory;
  import com.google.api.client.util.store.FileDataStoreFactory;
  import com.google.api.services.drive.Drive;
  import org.apache.camel.CamelContext;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class InteractiveGoogleDriveClientFactory implements GoogleDriveClientFactory {
      private static final Logger LOG = LoggerFactory.getLogger(InteractiveGoogleDriveClientFactory.class);
      private static final java.io.File DATA_STORE_DIR = new java.io.File(".google_drive");
      private NetHttpTransport transport;
      private JacksonFactory jsonFactory;
      private FileDataStoreFactory dataStoreFactory;
  
      public InteractiveGoogleDriveClientFactory() {
          this.transport = new NetHttpTransport();
          this.jsonFactory = new JacksonFactory();
      }
  
      @Override
      public Drive makeClient(
              String clientId, String clientSecret, Collection<String> scopes, String applicationName, String refreshToken,
              String accessToken) {
          Credential credential;
          try {
              credential = authorize(clientId, clientSecret, scopes);
              return new Drive.Builder(transport, jsonFactory, credential).setApplicationName(applicationName).build();
          } catch (Exception e) {
              LOG.error("Could not create Google Drive client.", e);
          }
          return null;
      }
  
      /**
       * This method interactively creates the necessary authorization tokens on first run, and stores the tokens in the
       * data store. Subsequent runs will no longer require interactivity as long as the credentials file is not removed.
       */
      private Credential authorize(String clientId, String clientSecret, Collection<String> scopes) throws Exception {
          dataStoreFactory = new FileDataStoreFactory(DATA_STORE_DIR);
          // set up authorization code flow
          GoogleAuthorizationCodeFlow flow
                  = new GoogleAuthorizationCodeFlow.Builder(transport, jsonFactory, clientId, clientSecret, scopes)
                          .setDataStoreFactory(dataStoreFactory)
                          .setAccessType("offline")
                          .build();
          // authorize
          return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
      }
  
      @Override
      public Drive makeClient(
              CamelContext camelContext, String serviceAccountKey, Collection<String> scopes, String applicationName,
              String delegate) {
          throw new IllegalArgumentException("Not implemented");
      }
  }
  