RandomSessionIdGenerator.java
/*
* 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.shiro.session.mgt.eis;
import org.apache.shiro.session.Session;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Serializable;
import java.util.Random;
/**
* Generates session IDs by using a {@link Random} instance to generate random IDs. The default {@code Random}
* implementation is a {@link java.security.SecureRandom SecureRandom} with the {@code SHA1PRNG} algorithm.
*
* @since 1.0
*/
public class RandomSessionIdGenerator implements SessionIdGenerator {
private static final Logger log = LoggerFactory.getLogger(RandomSessionIdGenerator.class);
private static final String RANDOM_NUM_GENERATOR_ALGORITHM_NAME = "SHA1PRNG";
private Random random;
public RandomSessionIdGenerator() {
try {
this.random = java.security.SecureRandom.getInstance(RANDOM_NUM_GENERATOR_ALGORITHM_NAME);
} catch (java.security.NoSuchAlgorithmException e) {
log.debug("The SecureRandom SHA1PRNG algorithm is not available on the current platform. Using the " +
"platform's default SecureRandom algorithm.", e);
this.random = new java.security.SecureRandom();
}
}
public Random getRandom() {
return this.random;
}
public void setRandom(Random random) {
this.random = random;
}
/**
* Returns the String value of the configured {@link Random}'s {@link Random#nextLong() nextLong()} invocation.
*
* @param session the {@link Session} instance to which the ID will be applied.
* @return the String value of the configured {@link Random}'s {@link Random#nextLong()} invocation.
*/
public Serializable generateId(Session session) {
//ignore the argument - just call the Random:
return Long.toString(getRandom().nextLong());
}
}