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.cassandra.sidecar.utils;
  
  import io.vertx.core.MultiMap;
  import io.vertx.core.file.FileSystem;
  import org.apache.cassandra.sidecar.common.request.data.XXHash32Digest;
  import org.jetbrains.annotations.NotNull;
  
  import static org.apache.cassandra.sidecar.common.http.SidecarHttpHeaderNames.CONTENT_XXHASH32;
  import static org.apache.cassandra.sidecar.common.http.SidecarHttpHeaderNames.CONTENT_XXHASH32_SEED;
  
  /**
   * Implementation of {@link DigestVerifier} to calculate the digest and match the calculated digest
   * with the expected digest.
   */
  public class XXHash32DigestVerifier extends AsyncFileDigestVerifier<XXHash32Digest>
  {
      protected XXHash32DigestVerifier(@NotNull FileSystem fs, @NotNull XXHash32Digest digest,
                                       @NotNull DigestAlgorithm digestAlgorithm)
      {
          super(fs, digest, digestAlgorithm);
      }
  
      public static XXHash32DigestVerifier create(FileSystem fs, MultiMap headers,
                                                  DigestAlgorithmProvider digestAlgorithmProvider)
      {
          XXHash32Digest digest = new XXHash32Digest(headers.get(CONTENT_XXHASH32), headers.get(CONTENT_XXHASH32_SEED));
          DigestAlgorithm digestAlgorithm = digestAlgorithmProvider.get(maybeGetSeedOrDefault(digest));
          return new XXHash32DigestVerifier(fs, digest, digestAlgorithm);
      }
  
      protected static int maybeGetSeedOrDefault(XXHash32Digest digest)
      {
          String seedHex = digest.seedHex();
          if (seedHex != null)
          {
              return (int) Long.parseLong(seedHex, 16);
          }
          return 0;
      }
  }
  