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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * 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
 *
 *      https://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 org.springframework.util;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

/**
 * A simple utility class for Base64 encoding and decoding.
 *
 * 

Adapts to Java 8's {@link java.util.Base64} in a convenience fashion. * * @author Juergen Hoeller * @author Gary Russell * @since 4.1 * @see java.util.Base64 */ public abstract class Base64Utils { private static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8; /** * Base64-encode the given byte array. * @param src the original byte array * @return the encoded byte array */ public static byte[] encode(byte[] src) { if (src.length == 0) { return src; } return Base64.getEncoder().encode(src); } /** * Base64-decode the given byte array. * @param src the encoded byte array * @return the original byte array */ public static byte[] decode(byte[] src) { if (src.length == 0) { return src; } return Base64.getDecoder().decode(src); } /** * Base64-encode the given byte array using the RFC 4648 * "URL and Filename Safe Alphabet". * @param src the original byte array * @return the encoded byte array * @since 4.2.4 */ public static byte[] encodeUrlSafe(byte[] src) { if (src.length == 0) { return src; } return Base64.getUrlEncoder().encode(src); } /** * Base64-decode the given byte array using the RFC 4648 * "URL and Filename Safe Alphabet". * @param src the encoded byte array * @return the original byte array * @since 4.2.4 */ public static byte[] decodeUrlSafe(byte[] src) { if (src.length == 0) { return src; } return Base64.getUrlDecoder().decode(src); } /** * Base64-encode the given byte array to a String. * @param src the original byte array * @return the encoded byte array as a UTF-8 String */ public static String encodeToString(byte[] src) { if (src.length == 0) { return ""; } return new String(encode(src), DEFAULT_CHARSET); } /** * Base64-decode the given byte array from an UTF-8 String. * @param src the encoded UTF-8 String * @return the original byte array */ public static byte[] decodeFromString(String src) { if (src.isEmpty()) { return new byte[0]; } return decode(src.getBytes(DEFAULT_CHARSET)); } /** * Base64-encode the given byte array to a String using the RFC 4648 * "URL and Filename Safe Alphabet". * @param src the original byte array * @return the encoded byte array as a UTF-8 String */ public static String encodeToUrlSafeString(byte[] src) { return new String(encodeUrlSafe(src), DEFAULT_CHARSET); } /** * Base64-decode the given byte array from an UTF-8 String using the RFC 4648 * "URL and Filename Safe Alphabet". * @param src the encoded UTF-8 String * @return the original byte array */ public static byte[] decodeFromUrlSafeString(String src) { return decodeUrlSafe(src.getBytes(DEFAULT_CHARSET)); } }





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