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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.
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 * 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).
 *
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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);
    }
}