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.geronimo.security.realm.providers;
018    
019    import java.util.Arrays;
020    import javax.security.auth.callback.Callback;
021    import javax.security.auth.callback.CallbackHandler;
022    import javax.security.auth.callback.NameCallback;
023    import javax.security.auth.callback.PasswordCallback;
024    import javax.security.auth.callback.UnsupportedCallbackException;
025    
026    /**
027     * @version $Rev: 706640 $ $Date: 2008-10-21 14:44:05 +0000 (Tue, 21 Oct 2008) $
028     */
029    public class PasswordCallbackHandler implements ClearableCallbackHandler {
030        private final String username;
031        private final char[] password;
032    
033        public PasswordCallbackHandler(String username, char[] password) {
034            this.username = username;
035            this.password = password;
036        }
037    
038        public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
039            for (int i = 0; i < callbacks.length; i++) {
040                Callback callback = callbacks[i];
041                if (callback instanceof NameCallback) {
042                    NameCallback nc = (NameCallback) callback;
043                    nc.setName(username);
044                } else if (callback instanceof PasswordCallback) {
045                    PasswordCallback pc = (PasswordCallback) callback;
046                    pc.setPassword(password);
047                } else {
048                    throw new UnsupportedCallbackException(callback);
049                }
050            }
051        }
052    
053        public void clear() {
054            Arrays.fill(password, '\0');
055        }
056    }