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.sdk.extensions.gcp.storage;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import java.io.IOException;
  import org.apache.beam.sdk.extensions.gcp.options.GcsOptions;
  import org.apache.beam.sdk.extensions.gcp.util.gcsfs.GcsPath;
  import org.apache.beam.sdk.io.fs.ResourceId;
  import org.apache.beam.sdk.options.PipelineOptions;
  
  /** GCP implementation of {@link PathValidator}. Only GCS paths are allowed. */
  public class GcsPathValidator implements PathValidator {
  
    private GcsOptions gcpOptions;
  
    private GcsPathValidator(GcsOptions options) {
      this.gcpOptions = options;
    }
  
    public static GcsPathValidator fromOptions(PipelineOptions options) {
      return new GcsPathValidator(options.as(GcsOptions.class));
    }
  
    /** Validates the input GCS path is accessible and that the path is well formed. */
    @Override
    public void validateInputFilePatternSupported(String filepattern) {
      getGcsPath(filepattern);
      verifyPath(filepattern);
      verifyPathIsAccessible(filepattern, "Could not find file %s");
    }
  
    /** Validates the output GCS path is accessible and that the path is well formed. */
    @Override
    public void validateOutputFilePrefixSupported(String filePrefix) {
      verifyPath(filePrefix);
      verifyPathIsAccessible(filePrefix, "Output path does not exist or is not writeable: %s");
    }
  
    @Override
    public void validateOutputResourceSupported(ResourceId resourceId) {
      checkArgument(
          "gs".equals(resourceId.getScheme()),
          "Expected a valid 'gs://' path but was given: '%s'",
          resourceId);
      verifyPath(resourceId.toString());
    }
  
    @Override
    public String verifyPath(String path) {
      GcsPath gcsPath = getGcsPath(path);
      checkArgument(gcsPath.isAbsolute(), "Must provide absolute paths for Dataflow");
      checkArgument(
          !gcsPath.getObject().isEmpty(),
          "Missing object or bucket in path: '%s', did you mean: 'gs://some-bucket/%s'?",
          gcsPath,
          gcsPath.getBucket());
      checkArgument(
          !gcsPath.getObject().contains("//"),
          "Dataflow Service does not allow objects with consecutive slashes");
      return gcsPath.toResourceName();
    }
  
    private void verifyPathIsAccessible(String path, String errorMessage) {
      GcsPath gcsPath = getGcsPath(path);
      try {
        gcpOptions.getGcsUtil().verifyBucketAccessible(gcsPath);
      } catch (IOException e) {
        throw new RuntimeException(String.format(errorMessage, path), e);
      }
    }
  
    private GcsPath getGcsPath(String path) {
      try {
        return GcsPath.fromUri(path);
      } catch (IllegalArgumentException e) {
        throw new IllegalArgumentException(
            String.format("Expected a valid 'gs://' path but was given '%s'", path), e);
      }
    }
  }
  