* Sonatype Nexus (TM) Open Source Version
 * Copyright (c) 2017-present Sonatype, Inc.
 * All rights reserved. Includes the third-party code listed at http://links.sonatype.com/products/nexus/oss/attributions.
 * This program and the accompanying materials are made available under the terms of the Eclipse Public License Version 1.0,
 * which accompanies this distribution and is available at http://www.eclipse.org/legal/epl-v10.html.
 * Sonatype Nexus (TM) Professional Version is available from Sonatype, Inc. "Sonatype" and "Sonatype Nexus" are trademarks
 * of Sonatype, Inc. Apache Maven is a trademark of the Apache Software Foundation. M2eclipse is a trademark of the
 * Eclipse Foundation. All other trademarks are the property of their respective owners.
package org.sonatype.nexus.blobstore.s3.internal;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.S3Object;

import static com.google.common.base.Preconditions.checkNotNull;

 * Persistent properties file stored in AWS S3.
public class S3PropertiesFile
    extends Properties
  private static final Logger log = LoggerFactory.getLogger(S3PropertiesFile.class);

  private final AmazonS3 s3;

  private final String bucket;

  private final String key;

  public S3PropertiesFile(final AmazonS3 s3, final String bucket, final String key) {
    this.s3 = checkNotNull(s3);
    this.bucket = checkNotNull(bucket);
    this.key = checkNotNull(key);

  public void load() throws IOException {
    log.debug("Loading: {}/{}", bucket, key);

    try (S3Object object = s3.getObject(bucket, key)) {
      try (InputStream inputStream = object.getObjectContent()) {

  public void store() throws IOException {
    log.debug("Storing: {}/{}", bucket, key);

    ByteArrayOutputStream bufferStream = new ByteArrayOutputStream();
    store(bufferStream, null);
    byte[] buffer = bufferStream.toByteArray();

    ObjectMetadata metadata = new ObjectMetadata();
    s3.putObject(bucket, key, new ByteArrayInputStream(buffer), metadata);

  public boolean exists() throws IOException {
    return s3.doesObjectExist(bucket, key);

  public void remove() throws IOException {
    s3.deleteObject(bucket, key);

  public String toString() {
    return getClass().getSimpleName() + "{" +
        "bucket=" + bucket +
        ", key=" + key +