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/**
* All rights reserved. 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.jivesoftware.smackx.bytestreams.ibb;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.filter.AndFilter;
import org.jivesoftware.smack.filter.IQTypeFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.bytestreams.BytestreamListener;
import org.jivesoftware.smackx.bytestreams.ibb.packet.Open;
/**
* InitiationListener handles all incoming In-Band Bytestream open requests. If there are no
* listeners for a In-Band Bytestream request InitiationListener will always refuse the request and
* reply with a <not-acceptable/> error (<a
* href="http://xmpp.org/extensions/xep-0047.html#example-5" >XEP-0047</a> Section 2.1).
* <p>
* All In-Band Bytestream request having a block size greater than the maximum allowed block size
* for this connection are rejected with an <resource-constraint/> error. The maximum block
* size can be set by invoking {@link InBandBytestreamManager#setMaximumBlockSize(int)}.
*
* @author Henning Staib
*/
class InitiationListener implements PacketListener {
/* manager containing the listeners and the XMPP connection */
private final InBandBytestreamManager manager;
/* packet filter for all In-Band Bytestream requests */
private final PacketFilter initFilter = new AndFilter(new PacketTypeFilter(Open.class),
new IQTypeFilter(IQ.Type.SET));
/* executor service to process incoming requests concurrently */
private final ExecutorService initiationListenerExecutor;
/**
* Constructor.
*
* @param manager the In-Band Bytestream manager
*/
protected InitiationListener(InBandBytestreamManager manager) {
this.manager = manager;
initiationListenerExecutor = Executors.newCachedThreadPool();
}
public void processPacket(final Packet packet) {
initiationListenerExecutor.execute(new Runnable() {
public void run() {
processRequest(packet);
}
});
}
private void processRequest(Packet packet) {
Open ibbRequest = (Open) packet;
// validate that block size is within allowed range
if (ibbRequest.getBlockSize() > this.manager.getMaximumBlockSize()) {
this.manager.replyResourceConstraintPacket(ibbRequest);
return;
}
// ignore request if in ignore list
if (this.manager.getIgnoredBytestreamRequests().remove(ibbRequest.getSessionID()))
return;
// build bytestream request from packet
InBandBytestreamRequest request = new InBandBytestreamRequest(this.manager, ibbRequest);
// notify listeners for bytestream initiation from a specific user
BytestreamListener userListener = this.manager.getUserListener(ibbRequest.getFrom());
if (userListener != null) {
userListener.incomingBytestreamRequest(request);
}
else if (!this.manager.getAllRequestListeners().isEmpty()) {
/*
* if there is no user specific listener inform listeners for all initiation requests
*/
for (BytestreamListener listener : this.manager.getAllRequestListeners()) {
listener.incomingBytestreamRequest(request);
}
}
else {
/*
* if there is no listener for this initiation request, reply with reject message
*/
this.manager.replyRejectPacket(ibbRequest);
}
}
/**
* Returns the packet filter for In-Band Bytestream open requests.
*
* @return the packet filter for In-Band Bytestream open requests
*/
protected PacketFilter getFilter() {
return this.initFilter;
}
/**
* Shuts down the listeners executor service.
*/
protected void shutdown() {
this.initiationListenerExecutor.shutdownNow();
}
}
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