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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * 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

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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

  * @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.

      */

    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.

     * @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.

     * @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.

      *

      * @return String[] {"DigestMD5"} if policies in env match those of this

      * factory.

      */

    public String[] getMechanismNames(Map<String,?> env) {

        return PolicyUtils.filterMechs(myMechs, mechPolicies, env);

    }

}