kerby-kerb/kerb-admin/src/main/java/org/apache/kerby/kerberos/kerb/admin/kpasswd/PasswdHandler.java

/**
 *  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.kerby.kerberos.kerb.admin.kpasswd;

import org.apache.kerby.kerberos.kerb.KrbException;
import org.apache.kerby.kerberos.kerb.admin.kpasswd.request.PasswdRequest;

import java.io.IOException;
import java.nio.ByteBuffer;

public abstract class PasswdHandler {

    /**
     * Init with krbcontext.
     *
     * @param context The krbcontext
     */
    public void init(PasswdContext context) {

    }

    /**
     * Handle the password server request.
     *
     * @param passwdRequest The password server request
     * @throws KrbException e
     */
    public void handleRequest(PasswdRequest passwdRequest) throws KrbException {
        passwdRequest.process();

        String request = "Client request change password.";
        ByteBuffer requestMessage = ByteBuffer.allocate(request.length() + 4);
        requestMessage.putInt(request.length());
        requestMessage.put(request.getBytes());
        requestMessage.flip();

        try {
            sendMessage(passwdRequest, requestMessage);
        } catch (IOException e) {
            throw new KrbException("sending message failed", e);
        }
    }

    /**
     * Process the response message from kdc.
     *
     * @param passwdRequest The kpasswd request
     * @param responseMessage The message from kdc
     * @throws KrbException e
     */
    public void onResponseMessage(PasswdRequest passwdRequest,
                                  ByteBuffer responseMessage) throws KrbException {
        String message = new String(responseMessage.array());
        System.out.println("client receive message: ");
        System.out.println(message);
    }

    /**
     * Send message to password server.
     *
     * @param passwdRequest The change password request
     * @param requestMessage The request message to password server
     * @throws IOException e
     */
    protected abstract void sendMessage(PasswdRequest passwdRequest,
                                        ByteBuffer requestMessage) throws IOException;
}