001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.util;
018
019import java.lang.reflect.Method;
020
021import org.apache.logging.log4j.LoggingException;
022
023/**
024 * Base64 encodes Strings. This utility is only necessary because the mechanism to do this changed in Java 8 and
025 * the original method was removed in Java 9.
026 */
027public final class Base64Util {
028
029    private static Method encodeMethod = null;
030    private static Object encoder = null;
031
032    static {
033        try {
034            Class<?> clazz = LoaderUtil.loadClass("java.util.Base64");
035            Class<?> encoderClazz = LoaderUtil.loadClass("java.util.Base64$Encoder");
036            Method method = clazz.getMethod("getEncoder");
037            encoder = method.invoke(null);
038            encodeMethod = encoderClazz.getMethod("encodeToString", byte[].class);
039        } catch (Exception ex) {
040            try {
041                Class<?> clazz = LoaderUtil.loadClass("javax.xml.bind.DataTypeConverter");
042                encodeMethod = clazz.getMethod("printBase64Binary");
043            } catch (Exception ex2) {
044                LowLevelLogUtil.logException("Unable to create a Base64 Encoder", ex2);
045            }
046        }
047    }
048
049    private Base64Util() {
050    }
051
052    public static String encode(String str) {
053        if (str == null) {
054            return null;
055        }
056        byte [] data = str.getBytes();
057        if (encodeMethod != null) {
058            try {
059                return (String) encodeMethod.invoke(encoder, data);
060            } catch (Exception ex) {
061                throw new LoggingException("Unable to encode String", ex);
062            }
063        }
064        throw new LoggingException("No Encoder, unable to encode string");
065    }
066}