Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /**
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| 2 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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| 3 | * you may not use this file except in compliance with the License.
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| 4 | * You may obtain a copy of the License at
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| 5 | *
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| 6 | * http://www.apache.org/licenses/LICENSE-2.0
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| 7 | *
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| 8 | * Unless required by applicable law or agreed to in writing, software
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| 9 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 10 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 11 | * See the License for the specific language governing permissions and
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| 12 | * limitations under the License.
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| 13 | */
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| 14 | package org.jivesoftware.smackx.bytestreams.ibb;
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| 15 |
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| 16 | import java.util.concurrent.ExecutorService;
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| 17 | import java.util.concurrent.Executors;
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| 18 |
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| 19 | import org.jivesoftware.smack.PacketListener;
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| 20 | import org.jivesoftware.smack.filter.AndFilter;
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| 21 | import org.jivesoftware.smack.filter.IQTypeFilter;
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| 22 | import org.jivesoftware.smack.filter.PacketFilter;
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| 23 | import org.jivesoftware.smack.filter.PacketTypeFilter;
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| 24 | import org.jivesoftware.smack.packet.IQ;
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| 25 | import org.jivesoftware.smack.packet.Packet;
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| 26 | import org.jivesoftware.smackx.bytestreams.BytestreamListener;
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| 27 | import org.jivesoftware.smackx.bytestreams.ibb.packet.Open;
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| 28 |
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| 29 | /**
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| 30 | * InitiationListener handles all incoming In-Band Bytestream open requests. If there are no
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| 31 | * listeners for a In-Band Bytestream request InitiationListener will always refuse the request and
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| 32 | * reply with a <not-acceptable/> error (<a
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| 33 | * href="http://xmpp.org/extensions/xep-0047.html#example-5" >XEP-0047</a> Section 2.1).
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| 34 | * <p>
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| 35 | * All In-Band Bytestream request having a block size greater than the maximum allowed block size
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| 36 | * for this connection are rejected with an <resource-constraint/> error. The maximum block
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| 37 | * size can be set by invoking {@link InBandBytestreamManager#setMaximumBlockSize(int)}.
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| 38 | *
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| 39 | * @author Henning Staib
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| 40 | */
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| 41 | class InitiationListener implements PacketListener {
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| 42 |
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| 43 | /* manager containing the listeners and the XMPP connection */
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| 44 | private final InBandBytestreamManager manager;
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| 45 |
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| 46 | /* packet filter for all In-Band Bytestream requests */
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| 47 | private final PacketFilter initFilter = new AndFilter(new PacketTypeFilter(Open.class),
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| 48 | new IQTypeFilter(IQ.Type.SET));
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| 49 |
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| 50 | /* executor service to process incoming requests concurrently */
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| 51 | private final ExecutorService initiationListenerExecutor;
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| 52 |
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| 53 | /**
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| 54 | * Constructor.
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| 55 | *
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| 56 | * @param manager the In-Band Bytestream manager
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| 57 | */
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| 58 | protected InitiationListener(InBandBytestreamManager manager) {
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| 59 | this.manager = manager;
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| 60 | initiationListenerExecutor = Executors.newCachedThreadPool();
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| 61 | }
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| 62 |
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| 63 | public void processPacket(final Packet packet) {
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| 64 | initiationListenerExecutor.execute(new Runnable() {
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| 65 |
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| 66 | public void run() {
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| 67 | processRequest(packet);
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| 68 | }
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| 69 | });
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| 70 | }
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| 71 |
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| 72 | private void processRequest(Packet packet) {
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| 73 | Open ibbRequest = (Open) packet;
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| 74 |
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| 75 | // validate that block size is within allowed range
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| 76 | if (ibbRequest.getBlockSize() > this.manager.getMaximumBlockSize()) {
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| 77 | this.manager.replyResourceConstraintPacket(ibbRequest);
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| 78 | return;
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| 79 | }
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| 80 |
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| 81 | // ignore request if in ignore list
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| 82 | if (this.manager.getIgnoredBytestreamRequests().remove(ibbRequest.getSessionID()))
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| 83 | return;
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| 84 |
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| 85 | // build bytestream request from packet
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| 86 | InBandBytestreamRequest request = new InBandBytestreamRequest(this.manager, ibbRequest);
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| 87 |
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| 88 | // notify listeners for bytestream initiation from a specific user
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| 89 | BytestreamListener userListener = this.manager.getUserListener(ibbRequest.getFrom());
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| 90 | if (userListener != null) {
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| 91 | userListener.incomingBytestreamRequest(request);
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| 92 |
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| 93 | }
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| 94 | else if (!this.manager.getAllRequestListeners().isEmpty()) {
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| 95 | /*
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| 96 | * if there is no user specific listener inform listeners for all initiation requests
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| 97 | */
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| 98 | for (BytestreamListener listener : this.manager.getAllRequestListeners()) {
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| 99 | listener.incomingBytestreamRequest(request);
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| 100 | }
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| 101 |
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| 102 | }
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| 103 | else {
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| 104 | /*
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| 105 | * if there is no listener for this initiation request, reply with reject message
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| 106 | */
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| 107 | this.manager.replyRejectPacket(ibbRequest);
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| 108 | }
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| 109 | }
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| 110 |
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| 111 | /**
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| 112 | * Returns the packet filter for In-Band Bytestream open requests.
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| 113 | *
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| 114 | * @return the packet filter for In-Band Bytestream open requests
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| 115 | */
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| 116 | protected PacketFilter getFilter() {
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| 117 | return this.initFilter;
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| 118 | }
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| 119 |
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| 120 | /**
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| 121 | * Shuts down the listeners executor service.
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| 122 | */
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| 123 | protected void shutdown() {
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| 124 | this.initiationListenerExecutor.shutdownNow();
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| 125 | }
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| 126 |
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| 127 | }
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