com.predic8.membrane.core.interceptor.authentication.session.NumericTokenProvider Maven / Gradle / Ivy
/* Copyright 2009, 2011 predic8 GmbH, www.predic8.com
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 com.predic8.membrane.core.interceptor.authentication.session;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.security.SecureRandom;
import java.util.Map;
import java.util.NoSuchElementException;
public abstract class NumericTokenProvider implements TokenProvider {
Logger log = LoggerFactory.getLogger(NumericTokenProvider.class);
private final SecureRandom r = new SecureRandom();
private long hash(Map userAttributes) {
long hash = 0;
for (Map.Entry entry : userAttributes.entrySet()) {
hash += entry.getKey().hashCode();
hash += 3 * entry.getValue().hashCode();
}
return hash;
}
protected String generateToken(Map userAttributes) {
int t = (int) hash(userAttributes);
synchronized(r) {
t = t ^ r.nextInt();
}
t = Math.abs(t % 1000000);
String token = String.format("%06d", t);
synchronized (userAttributes) {
userAttributes.put("token", token);
}
return token;
}
@Override
public void verifyToken(Map userAttributes, String token) {
String t1;
synchronized (userAttributes) {
t1 = userAttributes.get("token");
}
if (t1 == null || !t1.equals(token)) {
log.info("The given token was not equal to generated token.\nGenerated token: \"" + t1 + "\"\nGiven token: \"" + token + "\"\nUser: \"" + userAttributes.get("username")+ "\"");
throw new NoSuchElementException();
}
}
}