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.sheets;
  
  import java.io.IOException;
  import java.util.Collection;
  
  import com.google.api.client.auth.oauth2.Credential;
  import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
  import com.google.api.client.http.HttpTransport;
  import com.google.api.client.http.javanet.NetHttpTransport;
  import com.google.api.client.json.JsonFactory;
  import com.google.api.client.json.jackson2.JacksonFactory;
  import com.google.api.services.sheets.v4.Sheets;
  import org.apache.camel.CamelContext;
  import org.apache.camel.RuntimeCamelException;
  import org.apache.camel.support.ResourceHelper;
  import org.apache.camel.util.ObjectHelper;
  
  public class BatchGoogleSheetsClientFactory implements GoogleSheetsClientFactory {
  
      private final HttpTransport transport;
      private final JsonFactory jsonFactory;
  
      public BatchGoogleSheetsClientFactory() {
          this(new NetHttpTransport(), new JacksonFactory());
      }
  
      public BatchGoogleSheetsClientFactory(HttpTransport httpTransport) {
          this(httpTransport, new JacksonFactory());
      }
  
      public BatchGoogleSheetsClientFactory(HttpTransport httpTransport, JsonFactory jsonFactory) {
          this.transport = httpTransport;
          this.jsonFactory = jsonFactory;
      }
  
      @Override
      public Sheets makeClient(
              String clientId,
              String clientSecret,
              Collection<String> scopes,
              String applicationName,
              String refreshToken,
              String accessToken) {
          if (clientId == null || clientSecret == null) {
              throw new IllegalArgumentException("clientId and clientSecret are required to create Google Sheets client.");
          }
  
          try {
              Credential credential = authorize(clientId, clientSecret, scopes, refreshToken, accessToken);
  
              Sheets.Builder clientBuilder = new Sheets.Builder(transport, jsonFactory, credential)
                      .setApplicationName(applicationName);
              configure(clientBuilder);
              return clientBuilder.build();
          } catch (Exception e) {
              throw new RuntimeCamelException("Could not create Google Sheets client.", e);
          }
      }
  
      /**
       * Subclasses may add customized configuration to client builder.
       *
       * @param clientBuilder
       */
      protected void configure(Sheets.Builder clientBuilder) {
          clientBuilder.setRootUrl(Sheets.DEFAULT_ROOT_URL);
      }
  
      // Authorizes the installed application to access user's protected data.
      private Credential authorize(
              String clientId, String clientSecret, Collection<String> scopes, String refreshToken, String accessToken) {
          // authorize
          Credential credential = new GoogleCredential.Builder()
                  .setJsonFactory(jsonFactory)
                  .setTransport(transport)
                  .setClientSecrets(clientId, clientSecret)
                  .setServiceAccountScopes(scopes)
                  .build();
  
          if (ObjectHelper.isNotEmpty(refreshToken)) {
              credential.setRefreshToken(refreshToken);
          }
  
          if (ObjectHelper.isNotEmpty(accessToken)) {
              credential.setAccessToken(accessToken);
          }
  
          return credential;
      }
  
      @Override
      public Sheets makeClient(
              CamelContext camelContext, String serviceAccountKey, Collection<String> scopes, String applicationName,
              String delegate) {
          if (serviceAccountKey == null) {
              throw new IllegalArgumentException("serviceAccountKey is required to create Google Sheets client.");
          }
          try {
              Credential credential = authorizeServiceAccount(camelContext, serviceAccountKey, delegate, scopes);
              return new Sheets.Builder(transport, jsonFactory, credential).setApplicationName(applicationName).build();
          } catch (Exception e) {
              throw new RuntimeCamelException("Could not create Google Sheets client.", e);
          }
      }
  
      private Credential authorizeServiceAccount(
              CamelContext camelContext, String serviceAccountKey, String delegate, Collection<String> scopes) {
          // authorize
          try {
              GoogleCredential cred = GoogleCredential
                      .fromStream(ResourceHelper.resolveMandatoryResourceAsInputStream(camelContext, serviceAccountKey),
                              transport,
                              jsonFactory)
                      .createScoped(scopes != null && !scopes.isEmpty() ? scopes : null)
                      .createDelegated(delegate);
              cred.refreshToken();
              return cred;
          } catch (IOException e) {
              throw new RuntimeException(e);
          }
      }
  }
  