code: /*
   * Computoser is a music-composition algorithm and a website to present the results
   * Copyright (C) 2012-2014  Bozhidar Bozhanov
   *
   * Computoser is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as
   * published by the Free Software Foundation, either version 3 of the
   * License, or (at your option) any later version.
   *
   * Computoser is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with Computoser.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.music.service;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import javax.inject.Inject;
  
  import org.jets3t.service.S3Service;
  import org.jets3t.service.S3ServiceException;
  import org.jets3t.service.ServiceException;
  import org.jets3t.service.model.S3Object;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.stereotype.Service;
  
  @Service
  public class AmazonFileStorageService implements FileStorageService {
  
      @Inject
      private S3Service service;
  
      @Value("${s3.bucket.name}")
      private String bucketName;
  
      @Override
      public void storeFile(String path, byte[] content) throws IOException {
          storeFile(path, new ByteArrayInputStream(content), content.length);
      }
  
      @Override
      public void storeFile(String path, InputStream is, long size) throws IOException {
          path = stripLeadingSlash(path);
          S3Object fileObject = new S3Object(path);
          fileObject.setDataInputStream(is);
          if (size != -1) {
              fileObject.setContentLength(size);
          }
          try {
              service.putObject(bucketName, fileObject);
          } catch (S3ServiceException e) {
              throw new IOException(e);
          }
      }
  
      @Override
      public InputStream getFile(String path) throws IOException {
          try {
              path = stripLeadingSlash(path);
              S3Object object = service.getObject(bucketName, path);
              return object.getDataInputStream();
          } catch (ServiceException e) {
              throw new IOException(e);
          }
      }
  
      @Override
      public void moveFile(String sourcePath, String targetPath)
              throws IOException {
          try {
              sourcePath = stripLeadingSlash(sourcePath);
              targetPath = stripLeadingSlash(targetPath);
              S3Object targetObject = new S3Object(targetPath);
              service.moveObject(bucketName, sourcePath, bucketName, targetObject, true);
          } catch (ServiceException ex) {
              throw new IOException(ex);
          }
      }
  
      @Override
      public void delete(String path) throws IOException {
          path = stripLeadingSlash(path);
          try {
              service.deleteObject(bucketName, path);
          } catch (ServiceException ex) {
              throw new IOException(ex);
          }
      }
      private String stripLeadingSlash(String path) {
          if (path.charAt(0) == '/') {
              return path.substring(1);
          }
          return path;
      }
  }
  