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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.catalina.util;
public class StandardSessionIdGenerator extends SessionIdGeneratorBase {
@Override
public String generateSessionId(String route) {
byte[] random = new byte[16];
int sessionIdLength = getSessionIdLength();
// Render the result as a String of hexadecimal digits
// Start with enough space for sessionIdLength and medium route size
StringBuilder buffer = new StringBuilder(2 * sessionIdLength + 20);
int resultLenBytes = 0;
while (resultLenBytes < sessionIdLength) {
getRandomBytes(random);
for (int j = 0; j < random.length && resultLenBytes < sessionIdLength; j++) {
byte b1 = (byte) ((random[j] & 0xf0) >> 4);
byte b2 = (byte) (random[j] & 0x0f);
if (b1 < 10) {
buffer.append((char) ('0' + b1));
} else {
buffer.append((char) ('A' + (b1 - 10)));
}
if (b2 < 10) {
buffer.append((char) ('0' + b2));
} else {
buffer.append((char) ('A' + (b2 - 10)));
}
resultLenBytes++;
}
}
if (route != null && !route.isEmpty()) {
buffer.append('.').append(route);
} else {
String jvmRoute = getJvmRoute();
if (jvmRoute != null && !jvmRoute.isEmpty()) {
buffer.append('.').append(jvmRoute);
}
}
return buffer.toString();
}
}
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