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.core.config.plugins.convert;
018
019import java.lang.reflect.InvocationTargetException;
020import java.lang.reflect.Method;
021
022import org.apache.logging.log4j.Logger;
023import org.apache.logging.log4j.status.StatusLogger;
024import org.apache.logging.log4j.util.LoaderUtil;
025
026/**
027 * @Since 2.9
028 */
029public class Base64Converter {
030
031    private static final Logger LOGGER = StatusLogger.getLogger();
032    private static Method method = null;
033    private static Object decoder = null;
034
035    static {
036        try {
037            // Base64 is available in Java 8 and up.
038            Class<?> clazz = LoaderUtil.loadClass("java.util.Base64");
039            final Method getDecoder = clazz.getMethod("getDecoder", (Class[]) null);
040            decoder = getDecoder.invoke(null, (Object[]) null);
041            clazz = decoder.getClass();
042            method = clazz.getMethod("decode", String.class);
043        } catch (final ClassNotFoundException ex) {
044
045        } catch (final NoSuchMethodException ex) {
046
047        } catch (final IllegalAccessException ex) {
048
049        } catch (final InvocationTargetException ex) {
050
051        }
052        if (method == null) {
053            try {
054                // DatatypeConverter is not in the default module in Java 9.
055                final Class<?> clazz = LoaderUtil.loadClass("javax.xml.bind.DatatypeConverter");
056                method = clazz.getMethod("parseBase64Binary", String.class);
057            } catch (final ClassNotFoundException ex) {
058                LOGGER.error("No Base64 Converter is available");
059            } catch (final NoSuchMethodException ex) {
060
061            }
062        }
063    }
064
065    public static byte[] parseBase64Binary(final String encoded) {
066        if (method == null) {
067            LOGGER.error("No base64 converter");
068        } else {
069            try {
070                return (byte[]) method.invoke(decoder, encoded);
071            } catch (final IllegalAccessException ex) {
072                LOGGER.error("Error decoding string - " + ex.getMessage());
073            } catch (final InvocationTargetException ex) {
074                LOGGER.error("Error decoding string - " + ex.getMessage());
075            }
076        }
077        return new byte[0];
078    }
079}