PasswordCallbackHandler.java

/**
 *
 * Copyright 2004-2005 The Apache Software Foundation
 *
 *  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 org.apache.geronimo.security.realm.providers;

import java.util.Arrays;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;

/**
 * @version $Rev$ $Date$
 */
public class PasswordCallbackHandler implements ClearableCallbackHandler {
    private final String username;
    private final char[] password;

    public PasswordCallbackHandler(String username, char[] password) {
        this.username = username;
        this.password = password;
    }

    public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
        for (int i = 0; i < callbacks.length; i++) {
            Callback callback = callbacks[i];
            if (callback instanceof NameCallback) {
                NameCallback nc = (NameCallback) callback;
                nc.setName(username);
            } else if (callback instanceof PasswordCallback) {
                PasswordCallback pc = (PasswordCallback) callback;
                pc.setPassword(password);
            } else {
                throw new UnsupportedCallbackException(callback);
            }
        }
    }

    public void clear() {
        Arrays.fill(password, '\0');
    }
}