content: /*
   * Copyright 2024 Copyright 2022 Aiven Oy and
   * bigquery-connector-for-apache-kafka project contributors
   *
   * This software contains code derived from the Confluent BigQuery
   * Kafka Connector, Copyright Confluent, Inc, which in turn
   * contains code derived from the WePay BigQuery Kafka Connector,
   * Copyright WePay, 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.
   */
  
  package com.wepay.kafka.connect.bigquery.config;
  
  import static com.wepay.kafka.connect.bigquery.config.BigQuerySinkConfig.AUTO_CREATE_BUCKET_CONFIG;
  import static com.wepay.kafka.connect.bigquery.config.BigQuerySinkConfig.ENABLE_BATCH_CONFIG;
  import static com.wepay.kafka.connect.bigquery.config.BigQuerySinkConfig.GCS_BUCKET_NAME_CONFIG;
  
  import com.google.cloud.storage.Bucket;
  import com.google.cloud.storage.Storage;
  import com.google.common.annotations.VisibleForTesting;
  import com.wepay.kafka.connect.bigquery.GcpClientBuilder;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.Optional;
  
  public class GcsBucketValidator extends MultiPropertyValidator<BigQuerySinkConfig> {
  
    private static final Collection<String> DEPENDENTS = Collections.unmodifiableCollection(Arrays.asList(
        ENABLE_BATCH_CONFIG, AUTO_CREATE_BUCKET_CONFIG
    ));
  
    public GcsBucketValidator() {
      super(GCS_BUCKET_NAME_CONFIG);
    }
  
    @Override
    protected Collection<String> dependents() {
      return DEPENDENTS;
    }
  
    @Override
    protected Optional<String> doValidate(BigQuerySinkConfig config) {
      Storage gcs;
      try {
        gcs = new GcpClientBuilder.GcsBuilder()
            .withConfig(config)
            .build();
      } catch (RuntimeException e) {
        return Optional.of(String.format(
            "Failed to construct GCS client%s",
            e.getMessage() != null ? ": " + e.getMessage() : ""
        ));
      }
      return doValidate(gcs, config);
    }
  
    @VisibleForTesting
    Optional<String> doValidate(Storage gcs, BigQuerySinkConfig config) {
      List<String> batchLoadedTopics = config.getList(ENABLE_BATCH_CONFIG);
      if (batchLoadedTopics == null || batchLoadedTopics.isEmpty()) {
        // Batch loading is disabled; no need to validate the GCS bucket
        return Optional.empty();
      }
  
      String bucketName = config.getString(GCS_BUCKET_NAME_CONFIG);
      if (bucketName == null || bucketName.trim().isEmpty()) {
        return Optional.of("When GCS batch loading is enabled, a bucket must be provided");
      }
  
      if (config.getBoolean(AUTO_CREATE_BUCKET_CONFIG)) {
        return Optional.empty();
      }
  
      Bucket bucket = gcs.get(bucketName);
      if (bucket == null) {
        return Optional.of(String.format(
            "Automatic bucket creation is disabled but the GCS bucket %s does not exist. "
                + "Please either manually create this table before restarting the connector or enable automatic bucket creation "
                + "by the connector",
            bucketName
        ));
      }
  
      return Optional.empty();
    }
  }
  