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
  // 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.cloudstack.utils.cryptsetup;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.attribute.PosixFilePermission;
  import java.nio.file.attribute.PosixFilePermissions;
  import java.util.Set;
  
  public class KeyFile implements Closeable {
      private Path filePath = null;
  
      /**
       * KeyFile represents a temporary file for storing data
       * to pass to commands, as an alternative to putting sensitive
       * data on the command line.
       * @param key byte array of content for the KeyFile
       * @throws IOException as the IOException for creating KeyFile
       */
      public KeyFile(byte[] key) throws IOException {
          if (key != null && key.length > 0) {
              Set<PosixFilePermission> permissions = PosixFilePermissions.fromString("rw-------");
              filePath = Files.createTempFile("keyfile", ".tmp", PosixFilePermissions.asFileAttribute(permissions));
              Files.write(filePath, key);
          }
      }
  
      public Path getPath() {
          return filePath;
      }
  
      public boolean isSet() {
          return filePath != null;
      }
  
      /**
       * Converts the keyfile to the absolute path String where it is located
       * @return absolute path as String
       */
      @Override
      public String toString() {
          if (filePath != null) {
              return filePath.toAbsolutePath().toString();
          }
          return "";
      }
  
      /**
       * Deletes the underlying key file
       * @throws IOException as the IOException for deleting the underlying key file
       */
      @Override
      public void close() throws IOException {
          if (isSet()) {
              Files.delete(filePath);
              filePath = null;
          }
      }
  }
  