/*
 * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.security.sasl.digest;

import java.util.Map;

import javax.security.sasl.*;
import javax.security.auth.callback.CallbackHandler;

import com.sun.security.sasl.util.PolicyUtils;


Client and server factory for DIGEST-MD5 SASL client/server mechanisms.
See DigestMD5Client and DigestMD5Server for input requirements.
Author:
Jonathan Bruce, Rosanna Lee/**
 * Client and server factory for DIGEST-MD5 SASL client/server mechanisms.
 * See DigestMD5Client and DigestMD5Server for input requirements.
 *
 * @author Jonathan Bruce
 * @author Rosanna Lee
 */

public final class FactoryImpl implements SaslClientFactory,
SaslServerFactory{

    private static final String[] myMechs = { "DIGEST-MD5" };
    private static final int DIGEST_MD5 = 0;
    private static final int[] mechPolicies = {
        PolicyUtils.NOPLAINTEXT|PolicyUtils.NOANONYMOUS};

    
Empty constructor.
/**
     * Empty constructor.
     */
    public FactoryImpl() {
    }

    
Returns a new instance of the DIGEST-MD5 SASL client mechanism.
Throws:
SaslException – If there is an error creating the DigestMD5
SASL client.
Returns:
a new SaslClient; otherwise null if unsuccessful./**
     * Returns a new instance of the DIGEST-MD5 SASL client mechanism.
     *
     * @throws SaslException If there is an error creating the DigestMD5
     * SASL client.
     * @return a new SaslClient; otherwise null if unsuccessful.
     */
    public SaslClient createSaslClient(String[] mechs,
         String authorizationId, String protocol, String serverName,
         Map<String,?> props, CallbackHandler cbh)
         throws SaslException {

         for (int i=0; i<mechs.length; i++) {
            if (mechs[i].equals(myMechs[DIGEST_MD5]) &&
                PolicyUtils.checkPolicy(mechPolicies[DIGEST_MD5], props)) {

                if (cbh == null) {
                    throw new SaslException(
                        "Callback handler with support for RealmChoiceCallback, " +
                        "RealmCallback, NameCallback, and PasswordCallback " +
                        "required");
                }

                return new DigestMD5Client(authorizationId,
                    protocol, serverName, props, cbh);
            }
        }
        return null;
    }

    
Returns a new instance of the DIGEST-MD5 SASL server mechanism.
Throws:
SaslException – If there is an error creating the DigestMD5
SASL server.
Returns:
a new SaslServer; otherwise null if unsuccessful./**
     * Returns a new instance of the DIGEST-MD5 SASL server mechanism.
     *
     * @throws SaslException If there is an error creating the DigestMD5
     * SASL server.
     * @return a new SaslServer; otherwise null if unsuccessful.
     */
    public SaslServer createSaslServer(String mech,
         String protocol, String serverName, Map<String,?> props, CallbackHandler cbh)
         throws SaslException {

         if (mech.equals(myMechs[DIGEST_MD5]) &&
             PolicyUtils.checkPolicy(mechPolicies[DIGEST_MD5], props)) {

                if (cbh == null) {
                    throw new SaslException(
                        "Callback handler with support for AuthorizeCallback, "+
                        "RealmCallback, NameCallback, and PasswordCallback " +
                        "required");
                }

                return new DigestMD5Server(protocol, serverName, props, cbh);
         }
         return null;
    }

    
Returns the authentication mechanisms that this factory can produce.
Returns:
String[] {"DigestMD5"} if policies in env match those of this
factory./**
     * Returns the authentication mechanisms that this factory can produce.
     *
     * @return String[] {"DigestMD5"} if policies in env match those of this
     * factory.
     */
    public String[] getMechanismNames(Map<String,?> env) {
        return PolicyUtils.filterMechs(myMechs, mechPolicies, env);
    }
}