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/**
 * 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.activemq.jaas;

import java.io.IOException;

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;

/**
 * A JASS username password CallbackHandler.
 */
public class JassCredentialCallbackHandler implements CallbackHandler {

    private final String username;
    private final String password;

    public JassCredentialCallbackHandler(String username, String password) {
        this.username = username;
        this.password = password;
    }

    @Override
    public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
        for (int i = 0; i < callbacks.length; i++) {
            Callback callback = callbacks[i];
            if (callback instanceof PasswordCallback) {
                PasswordCallback passwordCallback = (PasswordCallback)callback;
                if (password == null) {
                    passwordCallback.setPassword(null);
                } else {
                    passwordCallback.setPassword(password.toCharArray());
                }
            } else if (callback instanceof NameCallback) {
                NameCallback nameCallback = (NameCallback)callback;
                if (username == null) {
                    nameCallback.setName(null);
                } else {
                    nameCallback.setName(username);
                }
            }
        }
    }
}