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   * 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.
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  package org.apache.cassandra.service.snapshot;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.time.Instant;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Arrays;
  
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  import static org.assertj.core.api.Assertions.assertThatIOException;
  import static org.assertj.core.api.Assertions.assertThat;
  
  import com.fasterxml.jackson.databind.ObjectMapper;
  import org.apache.cassandra.config.DurationSpec;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.io.util.FileOutputStreamPlus;
  import org.apache.cassandra.utils.JsonUtils;
  
  public class SnapshotManifestTest
  {
      @Rule
      public TemporaryFolder tempFolder = new TemporaryFolder();
  
      @Test
      public void testDeserializeFromInvalidFile() throws IOException {
          File manifestFile = new File(tempFolder.newFile("invalid"));
          assertThatIOException().isThrownBy(
              () -> {
                  SnapshotManifest.deserializeFromJsonFile(manifestFile);
              });
  
          FileOutputStreamPlus out = new FileOutputStreamPlus(manifestFile);
          out.write(1);
          out.write(2);
          out.write(3);
          out.close();
          assertThatIOException().isThrownBy(
              () -> SnapshotManifest.deserializeFromJsonFile(manifestFile));
      }
  
      @Test
      public void testDeserializeManifest() throws IOException
      {
          Map<String, Object> map = new HashMap<>();
          String createdAt = "2021-07-03T10:37:30Z";
          String expiresAt = "2021-08-03T10:37:30Z";
          map.put("created_at", createdAt);
          map.put("expires_at", expiresAt);
          map.put("files", Arrays.asList("db1", "db2", "db3"));
  
          ObjectMapper mapper = JsonUtils.JSON_OBJECT_MAPPER;
          File manifestFile = new File(tempFolder.newFile("manifest.json"));
          mapper.writeValue((OutputStream) new FileOutputStreamPlus(manifestFile), map);
          SnapshotManifest manifest = SnapshotManifest.deserializeFromJsonFile(manifestFile);
  
          assertThat(manifest.getExpiresAt()).isEqualTo(Instant.parse(expiresAt));
          assertThat(manifest.getCreatedAt()).isEqualTo(Instant.parse(createdAt));
          assertThat(manifest.getFiles()).contains("db1").contains("db2").contains("db3").hasSize(3);
      }
  
      @Test
      public void testOptionalFields() throws IOException {
          Map<String, Object> map = new HashMap<>();
          map.put("files", Arrays.asList("db1", "db2", "db3"));
          ObjectMapper mapper = JsonUtils.JSON_OBJECT_MAPPER;
          File manifestFile = new File(tempFolder.newFile("manifest.json"));
          mapper.writeValue((OutputStream) new FileOutputStreamPlus(manifestFile), map);
          SnapshotManifest manifest = SnapshotManifest.deserializeFromJsonFile(manifestFile);
  
          assertThat(manifest.getExpiresAt()).isNull();
          assertThat(manifest.getCreatedAt()).isNull();
          assertThat(manifest.getFiles()).contains("db1").contains("db2").contains("db3").hasSize(3);
      }
  
      @Test
      public void testIngoredFields() throws IOException {
          Map<String, Object> map = new HashMap<>();
          map.put("files", Arrays.asList("db1", "db2", "db3"));
          map.put("dummy", "dummy");
          ObjectMapper mapper = JsonUtils.JSON_OBJECT_MAPPER;
          File manifestFile = new File(tempFolder.newFile("manifest.json"));
          mapper.writeValue((OutputStream) new FileOutputStreamPlus(manifestFile), map);
          SnapshotManifest manifest = SnapshotManifest.deserializeFromJsonFile(manifestFile);
          assertThat(manifest.getFiles()).contains("db1").contains("db2").contains("db3").hasSize(3);
      }
  
      @Test
      public void testSerializeAndDeserialize() throws Exception {
          SnapshotManifest manifest = new SnapshotManifest(Arrays.asList("db1", "db2", "db3"), new DurationSpec.IntSecondsBound("2m"), Instant.ofEpochMilli(currentTimeMillis()), false);
          File manifestFile = new File(tempFolder.newFile("manifest.json"));
  
          manifest.serializeToJsonFile(manifestFile);
          manifest = SnapshotManifest.deserializeFromJsonFile(manifestFile);
          assertThat(manifest.getExpiresAt()).isNotNull();
          assertThat(manifest.getCreatedAt()).isNotNull();
          assertThat(manifest.getFiles()).contains("db1").contains("db2").contains("db3").hasSize(3);
      }
  }
  