com.netflix.exhibitor.core.s3.S3Utils.java Source code

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Here is the source code for com.netflix.exhibitor.core.s3.S3Utils.java

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/*
 * Copyright 2012 Netflix, 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 com.netflix.exhibitor.core.s3;

import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.PutObjectResult;
import org.apache.commons.codec.binary.Base64;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.security.MessageDigest;
import java.util.Date;

public class S3Utils {
    public static String toBase64(byte[] md5) {
        byte encoded[] = Base64.encodeBase64(md5, false);
        return new String(encoded);
    }

    public static byte[] md5(byte[] buffer, int length) {
        try {
            MessageDigest mdigest = MessageDigest.getInstance("MD5");
            mdigest.update(buffer, 0, length);
            return mdigest.digest();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String toHex(byte[] digest) {
        StringBuilder sb = new StringBuilder(digest.length * 2);
        for (byte b : digest) {
            String hex = Integer.toHexString(b);
            if (hex.length() == 1) {
                sb.append("0");
            } else if (hex.length() == 8) {
                hex = hex.substring(6);
            }
            sb.append(hex);
        }
        return sb.toString().toLowerCase();
    }

    public static ObjectMetadata simpleUploadFile(S3Client client, byte[] bytes, String bucket, String key)
            throws Exception {
        byte[] md5 = md5(bytes, bytes.length);

        ObjectMetadata metadata = new ObjectMetadata();
        metadata.setContentLength(bytes.length);
        metadata.setLastModified(new Date());
        metadata.setContentMD5(S3Utils.toBase64(md5));
        PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, key, new ByteArrayInputStream(bytes),
                metadata);
        PutObjectResult putObjectResult = client.putObject(putObjectRequest);

        if (!putObjectResult.getETag().equals(S3Utils.toHex(md5))) {
            throw new Exception("Unable to match MD5 for config");
        }

        return metadata;
    }
}