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 com.aliyun.oss.internal;
  
  import com.aliyun.oss.OSSEncryptionClient;
  import com.aliyun.oss.common.utils.IOUtils;
  import com.aliyun.oss.crypto.AdjustedRangeInputStream;
  import com.aliyun.oss.crypto.CipherInputStream;
  import com.aliyun.oss.model.GetObjectRequest;
  import com.aliyun.oss.model.OSSObject;
  
  import java.io.InputStream;
  
  public class OSSDownloadOperationEncrypted extends OSSDownloadOperation {
      private OSSEncryptionClient ossEncryptionClient;
  
      public OSSDownloadOperationEncrypted(OSSEncryptionClient ossEncryptionClient) {
          super(ossEncryptionClient.getObjectOperation());
          this.ossEncryptionClient = ossEncryptionClient;
      }
  
      @Override
      protected OSSObject getObjectWrap(GetObjectRequest getObjectRequest){
          return ossEncryptionClient.getObject(getObjectRequest);
      }
  
      @Override
      protected Long getInputStreamCRCWrap(InputStream inputStream) {
          if (inputStream instanceof AdjustedRangeInputStream) {
              InputStream subInputStream = ((AdjustedRangeInputStream) inputStream).getWrappedInputStream();
              if (subInputStream instanceof CipherInputStream) {
                  InputStream checkedInputStream = ((CipherInputStream) subInputStream).getDelegateStream();
                  return IOUtils.getCRCValue(checkedInputStream);
              }
          }
          return null;
      }
  }
  