org.apache.hadoop.security.FastSaslServerFactory Maven / Gradle / Ivy
/**
* 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.hadoop.security;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import javax.security.sasl.SaslServerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Class for dealing with caching SASL server factories.
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
public class FastSaslServerFactory implements SaslServerFactory {
private final Map> factoryCache =
new HashMap>();
public FastSaslServerFactory(Map props) {
final Enumeration factories =
Sasl.getSaslServerFactories();
while (factories.hasMoreElements()) {
SaslServerFactory factory = factories.nextElement();
for (String mech : factory.getMechanismNames(props)) {
if (!factoryCache.containsKey(mech)) {
factoryCache.put(mech, new ArrayList());
}
factoryCache.get(mech).add(factory);
}
}
}
@Override
public SaslServer createSaslServer(String mechanism, String protocol,
String serverName, Map props, CallbackHandler cbh)
throws SaslException {
SaslServer saslServer = null;
List factories = factoryCache.get(mechanism);
if (factories != null) {
for (SaslServerFactory factory : factories) {
saslServer = factory.createSaslServer(
mechanism, protocol, serverName, props, cbh);
if (saslServer != null) {
break;
}
}
}
return saslServer;
}
@Override
public String[] getMechanismNames(Map props) {
return factoryCache.keySet().toArray(new String[0]);
}
}