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/* **************************************************************************
 * $OpenLDAP: pkg/jldap/com/novell/sasl/client/ClientFactory.java,v 1.3 2005/01/17 15:00:54 sunilk Exp $
 *
 * Copyright (C) 2003 Novell, Inc. All Rights Reserved.
 *
 * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND
 * TREATIES. USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT
 * TO VERSION 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS
 * AVAILABLE AT HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE"
 * IN THE TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION
 * OF THIS WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP
 * PUBLIC LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT
 * THE PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
 ******************************************************************************/
package com.novell.sasl.client;

import com.novell.security.sasl.*;
import java.util.*;

/**
 * Implements a ClientFactory class for all the saslClients in this package
 */
public class ClientFactory extends Object implements SaslClientFactory
{
    public ClientFactory()
    {
    }

    /**
     * Creates a SaslClient using the parameters supplied
     *
     * @param mechanisms  The non-null list of mechanism names to try. Each is
     *                    the IANA-registered name of a SASL mechanism (e.g. "GSSAPI", "CRAM-MD5")
     *
     * @param authorizationId  The possibly null protocol-dependent
     *                     identification to be used for authorization. If
     *                     null or empty, the server derives an authorization
     *                     ID from the client's authentication credentials.
     *                     When the SASL authentication completes
     *                     successfully, the specified entity is granted
     *                     access.
     *
     * @param protocol     The non-null string name of the protocol for which
     *                     the authentication is being performed (e.g. "ldap")
     *
     * @param serverName   The non-null fully qualified host name of the server
     *                     to authenticate to
     *
     * @param props        The possibly null set of properties used to select
     *                     the SASL mechanism and to configure the
     *                     authentication exchange of the selected mechanism.
     *                     See the Sasl class for a list of standard properties.
     *                     Other, possibly mechanism-specific, properties can
     *                     be included. Properties not relevant to the selected
     *                     mechanism are ignored.
     *
     * @param cbh          The possibly null callback handler to used by the
     *                     SASL mechanisms to get further information from the
     *                     application/library to complete the authentication.
     *                     For example, a SASL mechanism might require the
     *                     authentication ID, password and realm from the
     *                     caller. The authentication ID is requested by using
     *                     a NameCallback. The password is requested by using
     *                     a PasswordCallback. The realm is requested by using
     *                     a RealmChoiceCallback if there is a list of realms
     *                     to choose from, and by using a RealmCallback if the
     *                     realm must be entered.
     *
     * @return            A possibly null SaslClient created using the
     *                     parameters supplied. If null, this factory cannot
     *                     produce a SaslClient using the parameters supplied.
     *
     * @exception SaslException  If a SaslClient instance cannot be created
     *                     because of an error
     */
    public SaslClient createSaslClient(
        String[] mechanisms,
        String authorizationId,
        String protocol,
        String serverName,
        Map props,
        javax.security.auth.callback.CallbackHandler cbh)
    throws SaslException
    {
        SaslClient  client=null;
        int         i;

        if (props == null)
            props = new HashMap();

        if (props.get(Sasl.QOP) == null)
            props.put(Sasl.QOP, "auth");

        if (props.get(Sasl.STRENGTH) == null)
            props.put(Sasl.STRENGTH, "high,medium,low");

        if (props.get(Sasl.SERVER_AUTH) == null)
            props.put(Sasl.SERVER_AUTH, "false");

        for (i=0, client=null; (i