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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2013-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.util;

import javax.xml.bind.DatatypeConverter;

import com.amazonaws.log.InternalLogFactory;

/**
 * A Base 64 codec API.
 *
 * See http://www.ietf.org/rfc/rfc4648.txt
 *
 * @author Hanson Char
 */
public enum Base64 {
    ;
    private static final Base64Codec codec = new Base64Codec();

    /**
     * Returns a base 64 encoded string of the given bytes.
     */
    public static String encodeAsString(byte ... bytes) {
        if (bytes == null)
            return null;
        try {
            return DatatypeConverter.printBase64Binary(bytes);
        } catch (NullPointerException ex) {
            // https://netbeans.org/bugzilla/show_bug.cgi?id=224923
            // https://issues.apache.org/jira/browse/CAMEL-4893

            // Note the converter should eventually be initialized and printBase64Binary should start working again
            InternalLogFactory.getLog(Base64.class)
                .debug("Recovering from JAXB bug: https://netbeans.org/bugzilla/show_bug.cgi?id=224923", ex);
        }
        return bytes.length == 0 ? "" : CodecUtils.toStringDirect(codec.encode(bytes));
    }

    /**
     * Returns a 64 encoded byte array of the given bytes.
     */
    public static byte[] encode(byte[] bytes) { return bytes == null || bytes.length == 0 ? bytes : codec.encode(bytes); }

    /**
     * Decodes the given base 64 encoded string,
     * skipping carriage returns, line feeds and spaces as needed.
     */
    public static byte[] decode(String b64) {
        if (b64 == null)
            return null;
        if (b64.length() == 0)
            return new byte[0];
        byte[] buf = new byte[b64.length()];
        int len = CodecUtils.sanitize(b64, buf);
        return codec.decode(buf, len);
    }

    /**
     * Decodes the given base 64 encoded bytes.
     */
    public static byte[] decode(byte[] b64) { return b64 == null || b64.length == 0 ? b64 :  codec.decode(b64, b64.length); }
}