/*
 * 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.io.gcp.storage;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.notNullValue;
import static org.hamcrest.CoreMatchers.startsWith;
import static org.hamcrest.MatcherAssert.assertThat;

import java.io.IOException;
import java.util.Collections;
import java.util.Date;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.PipelineResult;
import org.apache.beam.sdk.PipelineResult.State;
import org.apache.beam.sdk.extensions.gcp.options.GcsOptions;
import org.apache.beam.sdk.extensions.gcp.util.GcsUtil;
import org.apache.beam.sdk.extensions.gcp.util.gcsfs.GcsPath;
import org.apache.beam.sdk.io.FileSystems;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.io.fs.MatchResult;
import org.apache.beam.sdk.io.fs.MatchResult.Metadata;
import org.apache.beam.sdk.io.fs.ResolveOptions.StandardResolveOptions;
import org.apache.beam.sdk.io.fs.ResourceId;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.testing.FileChecksumMatcher;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.testing.TestPipelineOptions;
import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Iterables;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

// Run a specific test using:
//   ./gradlew :sdks:java:io:google-cloud-platform:integrationTest --tests
// GcsKmsKeyIT.testGcsWriteWithKmsKey --info

/** Integration test for GCS CMEK support. */
@RunWith(JUnit4.class)
public class GcsKmsKeyIT {

  private static final String INPUT_FILE = "gs://dataflow-samples/shakespeare/kinglear.txt";
  private static final String EXPECTED_CHECKSUM = "b9778bfac7fa8b934e42a322ef4bd4706b538fd0";

  @BeforeClass
  public static void setup() {
    PipelineOptionsFactory.register(TestPipelineOptions.class);
  }

  /**
   * Tests writing to gcpTempLocation with --dataflowKmsKey set on the command line. Verifies that
   * resulting output uses specified key and is readable. Does not verify any temporary files.
   */
  @Test
  public void testGcsWriteWithKmsKey() {
    TestPipelineOptions options =
        TestPipeline.testingPipelineOptions().as(TestPipelineOptions.class);
    GcsOptions gcsOptions = options.as(GcsOptions.class);
    final String expectedKmsKey = gcsOptions.getDataflowKmsKey();
    assertThat(expectedKmsKey, notNullValue());

    ResourceId filenamePrefix =
        FileSystems.matchNewResource(gcsOptions.getGcpTempLocation(), true)
            .resolve(
                String.format("GcsKmsKeyIT-%tF-%<tH-%<tM-%<tS-%<tL.output", new Date()),
                StandardResolveOptions.RESOLVE_FILE);

    Pipeline p = Pipeline.create(options);
    p.apply("ReadLines", TextIO.read().from(INPUT_FILE))
        .apply("WriteLines", TextIO.write().to(filenamePrefix));

    PipelineResult result = p.run();
    State state = result.waitUntilFinish();
    assertThat(state, equalTo(State.DONE));

    String filePattern = filenamePrefix + "*-of-*";
    assertThat(result, new FileChecksumMatcher(EXPECTED_CHECKSUM, filePattern));

    // Verify objects have KMS key set.
    try {
      MatchResult matchResult =
          Iterables.getOnlyElement(FileSystems.match(Collections.singletonList(filePattern)));
      GcsUtil gcsUtil = gcsOptions.getGcsUtil();
      for (Metadata metadata : matchResult.metadata()) {
        String kmsKey =
            gcsUtil.getObject(GcsPath.fromUri(metadata.resourceId().toString())).getKmsKeyName();
        // Returned kmsKey should have a version suffix.
        assertThat(
            metadata.resourceId().toString(),
            kmsKey,
            startsWith(expectedKmsKey + "/cryptoKeyVersions/"));
      }
    } catch (IOException e) {
      throw new AssertionError(e);
    }
  }
}