001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.jaas;
018    
019    import java.io.IOException;
020    
021    import javax.security.auth.callback.Callback;
022    import javax.security.auth.callback.CallbackHandler;
023    import javax.security.auth.callback.NameCallback;
024    import javax.security.auth.callback.PasswordCallback;
025    import javax.security.auth.callback.UnsupportedCallbackException;
026    
027    /**
028     * A JASS username password CallbackHandler.
029     */
030    public class JassCredentialCallbackHandler implements CallbackHandler {
031    
032        private final String username;
033        private final String password;
034    
035        public JassCredentialCallbackHandler(String username, String password) {
036            this.username = username;
037            this.password = password;
038        }
039    
040        public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
041            for (int i = 0; i < callbacks.length; i++) {
042                Callback callback = callbacks[i];
043                if (callback instanceof PasswordCallback) {
044                    PasswordCallback passwordCallback = (PasswordCallback)callback;
045                    if (password == null) {
046                        passwordCallback.setPassword(null);
047                    } else {
048                        passwordCallback.setPassword(password.toCharArray());
049                    }
050                } else if (callback instanceof NameCallback) {
051                    NameCallback nameCallback = (NameCallback)callback;
052                    if (username == null) {
053                        nameCallback.setName(null);
054                    } else {
055                        nameCallback.setName(username);
056                    }
057                }
058            }
059        }
060    }