1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.util;
18
19 import java.lang.reflect.Method;
20
21 import org.apache.logging.log4j.LoggingException;
22
23 /**
24 * Base64 encodes Strings. This utility is only necessary because the mechanism to do this changed in Java 8 and
25 * the original method was removed in Java 9.
26 */
27 public final class Base64Util {
28
29 private static Method encodeMethod = null;
30 private static Object encoder = null;
31
32 static {
33 try {
34 Class<?> clazz = LoaderUtil.loadClass("java.util.Base64");
35 Class<?> encoderClazz = LoaderUtil.loadClass("java.util.Base64$Encoder");
36 Method method = clazz.getMethod("getEncoder");
37 encoder = method.invoke(null);
38 encodeMethod = encoderClazz.getMethod("encodeToString", byte[].class);
39 } catch (Exception ex) {
40 try {
41 Class<?> clazz = LoaderUtil.loadClass("javax.xml.bind.DataTypeConverter");
42 encodeMethod = clazz.getMethod("printBase64Binary");
43 } catch (Exception ex2) {
44 LowLevelLogUtil.logException("Unable to create a Base64 Encoder", ex2);
45 }
46 }
47 }
48
49 private Base64Util() {
50 }
51
52 public static String encode(String str) {
53 if (str == null) {
54 return null;
55 }
56 byte [] data = str.getBytes();
57 if (encodeMethod != null) {
58 try {
59 return (String) encodeMethod.invoke(encoder, data);
60 } catch (Exception ex) {
61 throw new LoggingException("Unable to encode String", ex);
62 }
63 }
64 throw new LoggingException("No Encoder, unable to encode string");
65 }
66 }