/** | |
* 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(); | |
} | |
} |