/*
* TurnServer, the OpenSource Java Solution for TURN protocol. Maintained by the
* Jitsi community (http://jitsi.org).
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* Licensed 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.jitsi.turnserver.listeners;
import java.util.logging.*;
import org.ice4j.*;
import org.ice4j.attribute.*;
import org.ice4j.message.*;
import org.ice4j.stack.*;
import org.jitsi.turnserver.stack.*;
/**
* The class that would be handling and responding to incoming Refresh requests
* that are validated and sends a success or error response
*
* @author Aakash Garg
*/
public class RefreshRequestListener
implements RequestListener
{
/**
* The <tt>Logger</tt> used by the <tt>RefreshRequestListener</tt> class and
* its instances for logging output.
*/
private static final Logger logger = Logger
.getLogger(RefreshRequestListener.class.getName());
private final TurnStack turnStack;
/**
* The indicator which determines whether this
* <tt>RefreshRequestListener</tt> is currently started.
*/
private boolean started = false;
/**
* Creates a new RefreshRequestListener
*
* @param turnStack
*/
public RefreshRequestListener(StunStack turnStack)
{
if (turnStack instanceof TurnStack)
{
this.turnStack = (TurnStack) turnStack;
}
else
{
throw new IllegalArgumentException("This is not a TurnStack!");
}
}
/**
* (non-Javadoc)
*
* @see org.ice4j.stack.RequestListener#processRequest(org.ice4j.StunMessageEvent)
*/
@Override
public void processRequest(StunMessageEvent evt)
throws IllegalArgumentException
{
if (logger.isLoggable(Level.FINER))
{
logger.setLevel(Level.FINEST);
// logger.finer("Received request " + evt);
}
Message message = evt.getMessage();
if (message.getMessageType() == Message.REFRESH_REQUEST)
{
logger.finer("Received refresh request " + evt);
LifetimeAttribute lifetimeAttribute =
(LifetimeAttribute) message.getAttribute(Attribute.LIFETIME);
Response response = null;
TransportAddress clientAddress = evt.getRemoteAddress();
TransportAddress serverAddress = evt.getLocalAddress();
Transport transport = serverAddress.getTransport();
FiveTuple fiveTuple =
new FiveTuple(clientAddress, serverAddress, transport);
Allocation allocation =
this.turnStack.getServerAllocation(fiveTuple);
if (allocation != null)
{
if (lifetimeAttribute != null)
{
logger.finest("Refreshing allocation with relay addr "
+ allocation.getRelayAddress() + " with lifetime "
+ lifetimeAttribute.getLifetime());
allocation.refresh(lifetimeAttribute.getLifetime());
response = MessageFactory.createRefreshResponse(
(int) allocation.getLifetime());
}
else
{
logger.finest("Refreshing allocation with relay addr "
+ allocation.getRelayAddress()
+ " with default lifetime");
allocation.refresh();
response = MessageFactory.createRefreshResponse(
(int) allocation.getLifetime());
}
}
else
{
logger.finest("Allocation mismatch error");
response = MessageFactory.createRefreshErrorResponse(
ErrorCodeAttribute.ALLOCATION_MISMATCH);
}
try
{
turnStack.sendResponse(evt.getTransactionID().getBytes(),
response, evt.getLocalAddress(), evt.getRemoteAddress());
}
catch (Exception e)
{
logger.log(Level.INFO, "Failed to send " + response
+ " through " + evt.getLocalAddress(), e);
// try to trigger a 500 response although if this one failed,
throw new RuntimeException("Failed to send a response", e);
}
}
else
{
return;
}
}
/**
* Starts this <tt>RefreshRequestListener</tt>. If it is not currently
* running, does nothing.
*/
public void start()
{
if (!started)
{
turnStack.addRequestListener(this);
started = true;
}
}
/**
* Stops this <tt>RefreshRequestListenerr</tt>. A stopped
* <tt>ValidatedRequestListenerr</tt> can be restarted by calling
* {@link #start()} on it.
*/
public void stop()
{
turnStack.removeRequestListener(this);
started = false;
}
}