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.dolphinscheduler.api.utils;
  
  import org.apache.commons.io.IOUtils;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.MalformedURLException;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  
  import lombok.extern.slf4j.Slf4j;
  
  import org.springframework.core.io.Resource;
  import org.springframework.core.io.UrlResource;
  import org.springframework.web.multipart.MultipartFile;
  
  /**
   * file utils
   */
  @Slf4j
  public class FileUtils {
  
      /**
       * copy source InputStream to target file
       * @param file
       * @param destFilename
       */
      public static void copyInputStreamToFile(MultipartFile file, String destFilename) {
          try {
              org.apache.commons.io.FileUtils.copyInputStreamToFile(file.getInputStream(), new File(destFilename));
          } catch (IOException e) {
              log.error("failed to copy file , {} is empty file", file.getOriginalFilename(), e);
          }
      }
  
      /**
       * file to resource
       *
       * @param filename file name
       * @return resource
       * @throws MalformedURLException io exceptions
       */
      public static Resource file2Resource(String filename) throws MalformedURLException {
          Path file = Paths.get(filename);
  
          Resource resource = new UrlResource(file.toUri());
          if (resource.exists() || resource.isReadable()) {
              return resource;
          } else {
              log.error("File can not be read, fileName:{}", filename);
          }
          return null;
      }
  
      /**
       * file convert String
       * @param file MultipartFile file
       * @return file content string
       */
      public static String file2String(MultipartFile file) {
          try (InputStream inputStream = file.getInputStream()) {
              return IOUtils.toString(inputStream, StandardCharsets.UTF_8);
          } catch (IOException e) {
              log.error("file convert to string failed: {}", file.getName());
          }
  
          return "";
      }
  }
  