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/*
 * Copyright (C) 2004-2008 Jive Software. All rights reserved.
 *
 * 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.jivesoftware.openfire.sasl;

import javax.security.auth.callback.Callback;

import java.io.Serializable;


/**
 * This callback isused by SaslServer to determine if a password supplied by a 
 * client is verified.
 * Under most circumstances the PasswordCallback should be used instead, but its
 * use requires the underlying sercurity services have access to the stored password
 * to perform a comparison.
 * The security service provider instantiate and pass a VerifyPasswordCallback to the
 * handle method of a CallbackHandler to verify password information.
 *
 * @see javax.security.auth.callback.PasswordCallback
 * @see javax.security.auth.callback.CallbackHandler
 * @author Jay Kline
 */

public class VerifyPasswordCallback implements Callback, Serializable {

    private static final long serialVersionUID = -6393402725550707836L;

    private char[] password;

    private boolean verified;

    /**
     * Construct a VerifyPasswordCallback.
     * @param password the password to verify.
     */
    public VerifyPasswordCallback(char[] password) {
        this.password = (password == null ? null : password.clone());
        this.verified = false;
    }

    /**
     * Get the retrieved password.
     * @return the retrieved password, which may be null.
     */
    public char[] getPassword() {
        return (password == null ? null : password.clone());
    }

    /**
     * Clear the retrieved password.
     */
    public void clearPassword() {
        if (password != null) {
            for (int i = 0; i < password.length; i++) {
                password[i] = ' ';
            }
            password = null;
        }
    }

    /**
     * Indicate if this password is verified.
     * @param verified true if the password is verified; false otherwise
     */
    public void setVerified(boolean verified) {
        this.verified = verified;
    }

    /**
     * Determines wether the password is verified.
     * @return true if the password is verified; false otherwise
     */
    public boolean getVerified() {
        return verified;
    }

}