/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.qpid.client.security.crammd5hashed;

import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;
import java.util.Map;

public class CRAMMD5HashedSaslClientFactory implements SaslClientFactory
{
    /** The name of this mechanism */
    public static final String MECHANISM = "CRAM-MD5-HASHED";


    public SaslClient createSaslClient(String[] mechanisms, String authorizationId, String protocol, String serverName, Map<String, ?> props, CallbackHandler cbh) throws SaslException
    {
        for (int i = 0; i < mechanisms.length; i++)
        {
            if (mechanisms[i].equals(MECHANISM))
            {
                if (cbh == null)
                {
                    throw new SaslException("CallbackHandler must not be null");
                }

                return new CRAMMD5HashedSaslClient(authorizationId, protocol, serverName, props, cbh);
            }
        }
        return null;
    }

    public String[] getMechanismNames(Map<String,?> props)
    {
        if (props != null)
        {
            if (props.containsKey(Sasl.POLICY_NOPLAINTEXT) ||
                props.containsKey(Sasl.POLICY_NODICTIONARY) ||
                props.containsKey(Sasl.POLICY_NOACTIVE))
            {
                // returned array must be non null according to interface documentation
                return new String[0];
            }
        }

        return new String[]{MECHANISM};
    }
}
