/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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
*
* http://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.keycloak.common.util;
/**
* @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
* @version $Revision: 1 $
*/
public class Base64Url {
public static String encode(byte[] bytes) {
String s = Base64.encodeBytes(bytes);
s = s.split("=")[0]; // Remove any trailing '='s
s = s.replace('+', '-'); // 62nd char of encoding
s = s.replace('/', '_'); // 63rd char of encoding
return s;
}
public static byte[] decode(String s) {
s = s.replace('-', '+'); // 62nd char of encoding
s = s.replace('_', '/'); // 63rd char of encoding
switch (s.length() % 4) // Pad with trailing '='s
{
case 0:
break; // No pad chars in this case
case 2:
s += "==";
break; // Two pad chars
case 3:
s += "=";
break; // One pad char
default:
throw new RuntimeException(
"Illegal base64url string!");
}
try {
// KEYCLOAK-2479 : Avoid to try gzip decoding as for some objects, it may display exception to STDERR. And we know that object wasn't encoded as GZIP
return Base64.decode(s, Base64.DONT_GUNZIP);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}