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Minio Java Library for Amazon S3 Compatible Cloud Storage

There is a newer version: 8.5.12

/*
 * MinIO Java SDK for Amazon S3 Compatible Cloud Storage, (C) 2020 MinIO, Inc.
 *
 * 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.minio;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/** KMS type of Server-side encryption. */
public class ServerSideEncryptionKms extends ServerSideEncryption {
  private static final ObjectMapper objectMapper = new ObjectMapper();
  private final Map headers;

  public ServerSideEncryptionKms(String keyId, Map context)
      throws JsonProcessingException {
    if (keyId == null) {
      throw new IllegalArgumentException("Key ID cannot be null");
    }

    Map headers = new HashMap<>();
    headers.put("X-Amz-Server-Side-Encryption", "aws:kms");
    headers.put("X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id", keyId);
    if (context != null) {
      headers.put(
          "X-Amz-Server-Side-Encryption-Context",
          Base64.getEncoder()
              .encodeToString(
                  objectMapper.writeValueAsString(context).getBytes(StandardCharsets.UTF_8)));
    }

    this.headers = Collections.unmodifiableMap(headers);
  }

  @Override
  public final Map headers() {
    return headers;
  }

  @Override
  public String toString() {
    return "SSE-KMS";
  }
}