mirror of
https://github.com/vanitasvitae/Smack.git
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128 lines
4.8 KiB
Java
128 lines
4.8 KiB
Java
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/**
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.bytestreams.ibb;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import org.jivesoftware.smack.PacketListener;
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import org.jivesoftware.smack.filter.AndFilter;
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import org.jivesoftware.smack.filter.IQTypeFilter;
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import org.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.filter.PacketTypeFilter;
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import org.jivesoftware.smack.packet.IQ;
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import org.jivesoftware.smack.packet.Packet;
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import org.jivesoftware.smackx.bytestreams.BytestreamListener;
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import org.jivesoftware.smackx.bytestreams.ibb.packet.Open;
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/**
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* InitiationListener handles all incoming In-Band Bytestream open requests. If there are no
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* listeners for a In-Band Bytestream request InitiationListener will always refuse the request and
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* reply with a <not-acceptable/> error (<a
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* href="http://xmpp.org/extensions/xep-0047.html#example-5" >XEP-0047</a> Section 2.1).
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* <p>
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* All In-Band Bytestream request having a block size greater than the maximum allowed block size
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* for this connection are rejected with an <resource-constraint/> error. The maximum block
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* size can be set by invoking {@link InBandBytestreamManager#setMaximumBlockSize(int)}.
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*
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* @author Henning Staib
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*/
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class InitiationListener implements PacketListener {
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/* manager containing the listeners and the XMPP connection */
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private final InBandBytestreamManager manager;
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/* packet filter for all In-Band Bytestream requests */
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private final PacketFilter initFilter = new AndFilter(new PacketTypeFilter(Open.class),
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new IQTypeFilter(IQ.Type.SET));
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/* executor service to process incoming requests concurrently */
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private final ExecutorService initiationListenerExecutor;
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/**
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* Constructor.
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*
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* @param manager the In-Band Bytestream manager
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*/
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protected InitiationListener(InBandBytestreamManager manager) {
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this.manager = manager;
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initiationListenerExecutor = Executors.newCachedThreadPool();
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}
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public void processPacket(final Packet packet) {
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initiationListenerExecutor.execute(new Runnable() {
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public void run() {
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processRequest(packet);
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}
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});
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}
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private void processRequest(Packet packet) {
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Open ibbRequest = (Open) packet;
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// validate that block size is within allowed range
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if (ibbRequest.getBlockSize() > this.manager.getMaximumBlockSize()) {
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this.manager.replyResourceConstraintPacket(ibbRequest);
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return;
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}
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// ignore request if in ignore list
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if (this.manager.getIgnoredBytestreamRequests().remove(ibbRequest.getSessionID()))
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return;
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// build bytestream request from packet
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InBandBytestreamRequest request = new InBandBytestreamRequest(this.manager, ibbRequest);
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// notify listeners for bytestream initiation from a specific user
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BytestreamListener userListener = this.manager.getUserListener(ibbRequest.getFrom());
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if (userListener != null) {
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userListener.incomingBytestreamRequest(request);
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}
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else if (!this.manager.getAllRequestListeners().isEmpty()) {
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/*
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* if there is no user specific listener inform listeners for all initiation requests
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*/
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for (BytestreamListener listener : this.manager.getAllRequestListeners()) {
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listener.incomingBytestreamRequest(request);
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}
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}
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else {
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/*
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* if there is no listener for this initiation request, reply with reject message
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*/
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this.manager.replyRejectPacket(ibbRequest);
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}
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}
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/**
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* Returns the packet filter for In-Band Bytestream open requests.
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*
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* @return the packet filter for In-Band Bytestream open requests
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*/
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protected PacketFilter getFilter() {
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return this.initFilter;
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}
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/**
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* Shuts down the listeners executor service.
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*/
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protected void shutdown() {
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this.initiationListenerExecutor.shutdownNow();
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}
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}
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