| /** |
| * 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<String, List<SaslServerFactory>> factoryCache = |
| new HashMap<String, List<SaslServerFactory>>(); |
| |
| public FastSaslServerFactory(Map<String, ?> props) { |
| final Enumeration<SaslServerFactory> 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<SaslServerFactory>()); |
| } |
| factoryCache.get(mech).add(factory); |
| } |
| } |
| } |
| |
| @Override |
| public SaslServer createSaslServer(String mechanism, String protocol, |
| String serverName, Map<String, ?> props, CallbackHandler cbh) |
| throws SaslException { |
| SaslServer saslServer = null; |
| List<SaslServerFactory> 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<String, ?> props) { |
| return factoryCache.keySet().toArray(new String[0]); |
| } |
| } |