/*
 * 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.catalina.ha.authenticator;

import java.security.Principal;
import java.util.Map;
import java.io.IOException;

import org.apache.catalina.Session;
import org.apache.catalina.ha.ClusterManager;
import org.apache.catalina.ha.ClusterMessage;
import org.apache.catalina.ha.ClusterListener;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

/**
 * Receive replicated SingleSignOnMessage form other cluster node.
 * 
 * @author Fabien Carrion
 */
public class ClusterSingleSignOnListener extends ClusterListener {
 
    private static final Log log =
        LogFactory.getLog(ClusterSingleSignOnListener.class);

    /**
     * The descriptive information about this implementation.
     */
    protected static final String info = "org.apache.catalina.session.ClusterSingleSignOnListener/1.0";

    // ------------------------------------------------------------- Properties

    private ClusterSingleSignOn clusterSSO = null;


    //--Constructor---------------------------------------------

    public ClusterSingleSignOnListener() {
    }

    //--Logic---------------------------------------------------

    /**
     * Return descriptive information about this implementation.
     */
    public String getInfo() {

        return (info);

    }

    public ClusterSingleSignOn getClusterSSO() {

        return clusterSSO;

    }

    public void setClusterSSO(ClusterSingleSignOn clusterSSO) {

        this.clusterSSO = clusterSSO;

    }


    /**
     * Callback from the cluster, when a message is received, The cluster will
     * broadcast it invoking the messageReceived on the receiver.
     * 
     * @param myobj
     *            ClusterMessage - the message received from the cluster
     */
    public void messageReceived(ClusterMessage myobj) {
        if (myobj != null && myobj instanceof SingleSignOnMessage) {
            SingleSignOnMessage msg = (SingleSignOnMessage) myobj;
            int action = msg.getAction();
	    Session session = null;
        Principal principal = null;

	    if (log.isDebugEnabled())
		log.debug("SingleSignOnMessage Received with action "
			  + msg.getAction());

	    switch(action) {
	    case SingleSignOnMessage.ADD_SESSION:
		session = getSession(msg.getSessionId(),
				     msg.getContextName());
		if (session != null)
		    clusterSSO.associateLocal(msg.getSsoId(), session);
		break;
	    case SingleSignOnMessage.DEREGISTER_SESSION:
		session = getSession(msg.getSessionId(),
				     msg.getContextName());
		if (session != null)
		    clusterSSO.deregisterLocal(msg.getSsoId(), session);
		break;
	    case SingleSignOnMessage.LOGOUT_SESSION:
		clusterSSO.deregisterLocal(msg.getSsoId());
		break;
	    case SingleSignOnMessage.REGISTER_SESSION:
            if (msg.getPrincipal() != null) {
                principal = msg.getPrincipal().getPrincipal(clusterSSO.getContainer().getRealm());
            }
            clusterSSO.registerLocal(msg.getSsoId(), principal, msg.getAuthType(),
                    msg.getUsername(), msg.getPassword());
		break;
	    case SingleSignOnMessage.UPDATE_SESSION:
            if (msg.getPrincipal() != null) {
                principal = msg.getPrincipal().getPrincipal(clusterSSO.getContainer().getRealm());
            }
            clusterSSO.updateLocal(msg.getSsoId(), principal, msg.getAuthType(),
                    msg.getUsername(), msg.getPassword());
		break;
	    case SingleSignOnMessage.REMOVE_SESSION:
		session = getSession(msg.getSessionId(),
				     msg.getContextName());
		if (session != null)
		    clusterSSO.removeSessionLocal(msg.getSsoId(), session);
		break;
	    }
	}
    }

    /**
     * Accept only SingleSignOnMessage
     * 
     * @param msg
     *            ClusterMessage
     * @return boolean - returns true to indicate that messageReceived should be
     *         invoked. If false is returned, the messageReceived method will
     *         not be invoked.
     */
    public boolean accept(ClusterMessage msg) {
        return (msg instanceof SingleSignOnMessage);
    }


    private Session getSession(String sessionId, String ctxname) {
	
	Map managers = clusterSSO.getCluster().getManagers() ;
	Session session = null;

	if (ctxname == null) {
	    java.util.Iterator i = managers.keySet().iterator();
	    while (i.hasNext()) {
		String key = (String) i.next();
		ClusterManager mgr = (ClusterManager) managers.get(key);
		if (mgr != null) {
		    try {
			session = mgr.findSession(sessionId);
		    } catch (IOException io) {
			log.error("Session doesn't exist:" + io);
		    }
		    return session;
		} else {
		    //this happens a lot before the system has started
		    // up
		    if (log.isDebugEnabled())
			log.debug("Context manager doesn't exist:"
				  + key);
		}
	    }
	} else {
	    ClusterManager mgr = (ClusterManager) managers.get(ctxname);
	    if (mgr != null) {
		try {
		    session = mgr.findSession(sessionId);
		} catch (IOException io) {
		    log.error("Session doesn't exist:" + io);
		}
		return session;
	    } else if (log.isErrorEnabled())
		log.error("Context manager doesn't exist:" + ctxname);
	}

	return null;
    }
}