code: /*
   * Copyright © 2014-2017 EntIT Software LLC, a Micro Focus company (L.P.)
   *
   * Licensed 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 io.cloudslang.engine.queue.entities;
  
  import io.cloudslang.score.facade.entities.Execution;
  import net.jpountz.lz4.LZ4FrameInputStream;
  import net.jpountz.lz4.LZ4FrameOutputStream;
  import net.jpountz.lz4.LZ4FrameOutputStream.BLOCKSIZE;
  import org.apache.commons.io.IOUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  
  
  public class ExecutionMessageConverter {
      private static final int SIZE = 1024;
  
      @Autowired(required = false)
      private SensitiveDataHandler sensitiveDataHandler;
  
      public <T> T extractExecution(Payload payload) {
          return objFromBytes(payload.getData());
      }
  
      public Payload createPayload(Execution execution) {
          return createPayload(execution, false);
      }
  
      public Payload createPayload(Execution execution, boolean setContainsSensitiveData) {
          Payload payload = new Payload(objToBytes(execution));
          if (setContainsSensitiveData || checkContainsSensitiveData(execution)) {
              setSensitive(payload);
          }
          return payload;
      }
  
      private boolean checkContainsSensitiveData(Execution execution) {
          return sensitiveDataHandler != null &&
                  sensitiveDataHandler.containsSensitiveData(execution.getSystemContext(), execution.getContexts());
      }
  
      public boolean containsSensitiveData(Payload payload) {
          return isSensitive(payload);
      }
  
      private <T> T objFromBytes(byte[] bytes) {
          ObjectInputStream ois = null;
          try {
              ByteArrayInputStream is = new ByteArrayInputStream(bytes);
              skipPayloadMetaData(is);
  
              ois = new ObjectInputStream(new LZ4FrameInputStream(is));
              // noinspection unchecked
              return (T) ois.readObject();
          } catch (IOException | ClassNotFoundException ex) {
              throw new RuntimeException("Failed to read execution plan from byte[]. Error: ", ex);
          } finally {
              IOUtils.closeQuietly(ois);
          }
      }
  
      private byte[] objToBytes(Object obj) {
          ObjectOutputStream oos = null;
          try {
              ByteArrayOutputStream baos = new ByteArrayOutputStream(SIZE);
              initPayloadMetaData(baos);
  
              oos = new ObjectOutputStream(new LZ4FrameOutputStream(baos, BLOCKSIZE.SIZE_256KB));
              oos.writeObject(obj);
              oos.flush();
  
              return baos.toByteArray();
          } catch (IOException ex) {
              throw new RuntimeException("Failed to serialize execution plan. Error: ", ex);
          } finally {
              IOUtils.closeQuietly(oos);
          }
      }
  
      /***************************************************************************************/
      //we padding payload with clean bytes which then will be used for metadata writing
      private static final byte[] PAYLOAD_META_DATA_INIT_BYTES = {0};
  
      //for now meta data is only one byte
      private static final int INFRA_PART_BYTE = 0;
  
      private static final int IS_SENSITIVE = 1;
  
      private void setSensitive(Payload payload) {
          payload.getData()[INFRA_PART_BYTE] = IS_SENSITIVE;
      }
  
      private boolean isSensitive(Payload payload) {
          return payload.getData()[INFRA_PART_BYTE] == IS_SENSITIVE;
      }
  
      private void skipPayloadMetaData(ByteArrayInputStream is) {
          for (int i = 0; i < PAYLOAD_META_DATA_INIT_BYTES.length; i++) {
              is.read();
          }
      }
  
      private void initPayloadMetaData(ByteArrayOutputStream baos) throws IOException {
          baos.write(PAYLOAD_META_DATA_INIT_BYTES);
      }
  
  }
  