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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@4341 b35dd754-fafc-0310-a699-88a17e54d16e
507 lines
No EOL
22 KiB
Java
507 lines
No EOL
22 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright 2003-2004 Jive Software.
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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;
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import org.jivesoftware.smack.*;
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import org.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.filter.PacketIDFilter;
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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.smack.packet.XMPPError;
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import org.jivesoftware.smackx.packet.DiscoverInfo;
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import org.jivesoftware.smackx.packet.DiscoverItems;
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import java.util.*;
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/**
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* Manages discovery of services in XMPP entities. This class provides:
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* <ol>
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* <li>A registry of supported features in this XMPP entity.
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* <li>Automatic response when this XMPP entity is queried for information.
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* <li>Ability to discover items and information of remote XMPP entities.
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* <li>Ability to publish publicly available items.
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* </ol>
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*
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* @author Gaston Dombiak
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*/
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public class ServiceDiscoveryManager {
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private static String identityName = "Smack";
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private static String identityType = "pc";
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private static Map instances = new Hashtable();
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private XMPPConnection connection;
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private List features = new ArrayList();
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private Map nodeInformationProviders = new Hashtable();
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// Create a new ServiceDiscoveryManager on every established connection
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static {
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XMPPConnection.addConnectionListener(new ConnectionEstablishedListener() {
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public void connectionEstablished(XMPPConnection connection) {
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new ServiceDiscoveryManager(connection);
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}
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});
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}
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/**
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* Creates a new ServiceDiscoveryManager for a given XMPPConnection. This means that the
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* service manager will respond to any service discovery request that the connection may
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* receive.
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*
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* @param connection the connection to which a ServiceDiscoveryManager is going to be created.
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*/
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public ServiceDiscoveryManager(XMPPConnection connection) {
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this.connection = connection;
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init();
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}
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/**
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* Returns the ServiceDiscoveryManager instance associated with a given XMPPConnection.
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*
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* @param connection the connection used to look for the proper ServiceDiscoveryManager.
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* @return the ServiceDiscoveryManager associated with a given XMPPConnection.
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*/
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public static ServiceDiscoveryManager getInstanceFor(XMPPConnection connection) {
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return (ServiceDiscoveryManager) instances.get(connection);
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}
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/**
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* Returns the name of the client that will be returned when asked for the client identity
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* in a disco request. The name could be any value you need to identity this client.
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*
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* @return the name of the client that will be returned when asked for the client identity
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* in a disco request.
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*/
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public static String getIdentityName() {
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return identityName;
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}
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/**
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* Sets the name of the client that will be returned when asked for the client identity
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* in a disco request. The name could be any value you need to identity this client.
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*
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* @param name the name of the client that will be returned when asked for the client identity
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* in a disco request.
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*/
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public static void setIdentityName(String name) {
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identityName = name;
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}
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/**
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* Returns the type of client that will be returned when asked for the client identity in a
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* disco request. The valid types are defined by the category client. Follow this link to learn
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* the possible types: <a href="http://www.jabber.org/registrar/disco-categories.html#client">Jabber::Registrar</a>.
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*
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* @return the type of client that will be returned when asked for the client identity in a
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* disco request.
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*/
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public static String getIdentityType() {
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return identityType;
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}
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/**
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* Sets the type of client that will be returned when asked for the client identity in a
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* disco request. The valid types are defined by the category client. Follow this link to learn
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* the possible types: <a href="http://www.jabber.org/registrar/disco-categories.html#client">Jabber::Registrar</a>.
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*
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* @param type the type of client that will be returned when asked for the client identity in a
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* disco request.
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*/
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public static void setIdentityType(String type) {
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identityType = type;
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}
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/**
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* Initializes the packet listeners of the connection that will answer to any
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* service discovery request.
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*/
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private void init() {
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// Register the new instance and associate it with the connection
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instances.put(connection, this);
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// Add a listener to the connection that removes the registered instance when
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// the connection is closed
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connection.addConnectionListener(new ConnectionListener() {
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public void connectionClosed() {
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// Unregister this instance since the connection has been closed
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instances.remove(connection);
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}
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public void connectionClosedOnError(Exception e) {
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// Unregister this instance since the connection has been closed
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instances.remove(connection);
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}
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});
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// Listen for disco#items requests and answer with an empty result
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PacketFilter packetFilter = new PacketTypeFilter(DiscoverItems.class);
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PacketListener packetListener = new PacketListener() {
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public void processPacket(Packet packet) {
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DiscoverItems discoverItems = (DiscoverItems) packet;
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// Send back the items defined in the client if the request is of type GET
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if (discoverItems != null && discoverItems.getType() == IQ.Type.GET) {
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DiscoverItems response = new DiscoverItems();
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response.setType(IQ.Type.RESULT);
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response.setTo(discoverItems.getFrom());
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response.setPacketID(discoverItems.getPacketID());
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response.setNode(discoverItems.getNode());
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// Add the defined items related to the requested node. Look for
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// the NodeInformationProvider associated with the requested node.
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NodeInformationProvider nodeInformationProvider =
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getNodeInformationProvider(discoverItems.getNode());
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if (nodeInformationProvider != null) {
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// Specified node was found
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Iterator items = nodeInformationProvider.getNodeItems();
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if (items != null) {
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while (items.hasNext()) {
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response.addItem((DiscoverItems.Item) items.next());
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}
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}
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} else if(discoverItems.getNode() != null) {
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// Return <item-not-found/> error since client doesn't contain
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// the specified node
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response.setType(IQ.Type.ERROR);
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response.setError(new XMPPError(404, "item-not-found"));
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}
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connection.sendPacket(response);
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}
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}
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};
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connection.addPacketListener(packetListener, packetFilter);
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// Listen for disco#info requests and answer the client's supported features
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// To add a new feature as supported use the #addFeature message
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packetFilter = new PacketTypeFilter(DiscoverInfo.class);
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packetListener = new PacketListener() {
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public void processPacket(Packet packet) {
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DiscoverInfo discoverInfo = (DiscoverInfo) packet;
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// Answer the client's supported features if the request is of the GET type
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if (discoverInfo != null && discoverInfo.getType() == IQ.Type.GET) {
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DiscoverInfo response = new DiscoverInfo();
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response.setType(IQ.Type.RESULT);
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response.setTo(discoverInfo.getFrom());
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response.setPacketID(discoverInfo.getPacketID());
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response.setNode(discoverInfo.getNode());
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// Add the client's identity and features only if "node" is null
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if (discoverInfo.getNode() == null) {
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// Set this client identity
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DiscoverInfo.Identity identity = new DiscoverInfo.Identity("client",
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getIdentityName());
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identity.setType(getIdentityType());
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response.addIdentity(identity);
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// Add the registered features to the response
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synchronized (features) {
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for (Iterator it = getFeatures(); it.hasNext();) {
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response.addFeature((String) it.next());
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}
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}
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}
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else {
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// Disco#info was sent to a node. Check if we have information of the
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// specified node
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NodeInformationProvider nodeInformationProvider =
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getNodeInformationProvider(discoverInfo.getNode());
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if (nodeInformationProvider != null) {
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// Node was found. Add node features
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Iterator features = nodeInformationProvider.getNodeFeatures();
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if (features != null) {
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while (features.hasNext()) {
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response.addFeature((String) features.next());
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}
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}
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}
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else {
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// Return <item-not-found/> error since specified node was not found
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response.setType(IQ.Type.ERROR);
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response.setError(new XMPPError(404, "item-not-found"));
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}
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}
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connection.sendPacket(response);
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}
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}
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};
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connection.addPacketListener(packetListener, packetFilter);
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}
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/**
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* Returns the NodeInformationProvider responsible for providing information
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* (ie items) related to a given node or <tt>null</null> if none.<p>
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*
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* In MUC, a node could be 'http://jabber.org/protocol/muc#rooms' which means that the
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* NodeInformationProvider will provide information about the rooms where the user has joined.
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*
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* @param node the node that contains items associated with an entity not addressable as a JID.
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* @return the NodeInformationProvider responsible for providing information related
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* to a given node.
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*/
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private NodeInformationProvider getNodeInformationProvider(String node) {
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if (node == null) {
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return null;
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}
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return (NodeInformationProvider) nodeInformationProviders.get(node);
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}
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/**
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* Sets the NodeInformationProvider responsible for providing information
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* (ie items) related to a given node. Every time this client receives a disco request
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* regarding the items of a given node, the provider associated to that node will be the
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* responsible for providing the requested information.<p>
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*
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* In MUC, a node could be 'http://jabber.org/protocol/muc#rooms' which means that the
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* NodeInformationProvider will provide information about the rooms where the user has joined.
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*
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* @param node the node whose items will be provided by the NodeInformationProvider.
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* @param listener the NodeInformationProvider responsible for providing items related
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* to the node.
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*/
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public void setNodeInformationProvider(String node, NodeInformationProvider listener) {
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nodeInformationProviders.put(node, listener);
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}
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/**
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* Removes the NodeInformationProvider responsible for providing information
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* (ie items) related to a given node. This means that no more information will be
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* available for the specified node.
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*
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* In MUC, a node could be 'http://jabber.org/protocol/muc#rooms' which means that the
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* NodeInformationProvider will provide information about the rooms where the user has joined.
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*
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* @param node the node to remove the associated NodeInformationProvider.
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*/
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public void removeNodeInformationProvider(String node) {
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nodeInformationProviders.remove(node);
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}
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/**
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* Returns the supported features by this XMPP entity.
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*
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* @return an Iterator on the supported features by this XMPP entity.
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*/
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public Iterator getFeatures() {
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synchronized (features) {
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return Collections.unmodifiableList(new ArrayList(features)).iterator();
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}
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}
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/**
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* Registers that a new feature is supported by this XMPP entity. When this client is
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* queried for its information the registered features will be answered.<p>
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*
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* Since no packet is actually sent to the server it is safe to perform this operation
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* before logging to the server. In fact, you may want to configure the supported features
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* before logging to the server so that the information is already available if it is required
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* upon login.
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*
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* @param feature the feature to register as supported.
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*/
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public void addFeature(String feature) {
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synchronized (features) {
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features.add(feature);
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}
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}
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/**
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* Removes the specified feature from the supported features by this XMPP entity.<p>
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*
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* Since no packet is actually sent to the server it is safe to perform this operation
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* before logging to the server.
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*
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* @param feature the feature to remove from the supported features.
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*/
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public void removeFeature(String feature) {
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synchronized (features) {
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features.remove(feature);
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}
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}
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/**
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* Returns true if the specified feature is registered in the ServiceDiscoveryManager.
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*
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* @param feature the feature to look for.
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* @return a boolean indicating if the specified featured is registered or not.
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*/
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public boolean includesFeature(String feature) {
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synchronized (features) {
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return features.contains(feature);
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}
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}
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/**
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* Returns the discovered information of a given XMPP entity addressed by its JID.
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*
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* @param entityID the address of the XMPP entity.
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* @return the discovered information.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public DiscoverInfo discoverInfo(String entityID) throws XMPPException {
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return discoverInfo(entityID, null);
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}
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/**
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* Returns the discovered information of a given XMPP entity addressed by its JID and
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* note attribute. Use this message only when trying to query information which is not
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* directly addressable.
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*
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* @param entityID the address of the XMPP entity.
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* @param node the attribute that supplements the 'jid' attribute.
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* @return the discovered information.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public DiscoverInfo discoverInfo(String entityID, String node) throws XMPPException {
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// Discover the entity's info
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DiscoverInfo disco = new DiscoverInfo();
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disco.setType(IQ.Type.GET);
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disco.setTo(entityID);
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disco.setNode(node);
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// Create a packet collector to listen for a response.
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PacketCollector collector =
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connection.createPacketCollector(new PacketIDFilter(disco.getPacketID()));
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connection.sendPacket(disco);
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// Wait up to 5 seconds for a result.
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IQ result = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
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// Stop queuing results
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collector.cancel();
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if (result == null) {
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throw new XMPPException("No response from the server.");
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}
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if (result.getType() == IQ.Type.ERROR) {
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throw new XMPPException(result.getError());
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}
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return (DiscoverInfo) result;
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}
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/**
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* Returns the discovered items of a given XMPP entity addressed by its JID.
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*
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* @param entityID the address of the XMPP entity.
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* @return the discovered information.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public DiscoverItems discoverItems(String entityID) throws XMPPException {
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return discoverItems(entityID, null);
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}
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/**
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* Returns the discovered items of a given XMPP entity addressed by its JID and
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* note attribute. Use this message only when trying to query information which is not
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* directly addressable.
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*
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* @param entityID the address of the XMPP entity.
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* @param node the attribute that supplements the 'jid' attribute.
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* @return the discovered items.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public DiscoverItems discoverItems(String entityID, String node) throws XMPPException {
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// Discover the entity's items
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DiscoverItems disco = new DiscoverItems();
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disco.setType(IQ.Type.GET);
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disco.setTo(entityID);
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disco.setNode(node);
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// Create a packet collector to listen for a response.
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PacketCollector collector =
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connection.createPacketCollector(new PacketIDFilter(disco.getPacketID()));
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connection.sendPacket(disco);
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// Wait up to 5 seconds for a result.
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IQ result = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
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// Stop queuing results
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collector.cancel();
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if (result == null) {
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throw new XMPPException("No response from the server.");
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}
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if (result.getType() == IQ.Type.ERROR) {
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throw new XMPPException(result.getError());
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}
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return (DiscoverItems) result;
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}
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/**
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* Returns true if the server supports publishing of items. A client may wish to publish items
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* to the server so that the server can provide items associated to the client. These items will
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* be returned by the server whenever the server receives a disco request targeted to the bare
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* address of the client (i.e. user@host.com).
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*
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* @param entityID the address of the XMPP entity.
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* @return true if the server supports publishing of items.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public boolean canPublishItems(String entityID) throws XMPPException {
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DiscoverInfo info = discoverInfo(entityID);
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return info.containsFeature("http://jabber.org/protocol/disco#publish");
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}
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/**
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* Publishes new items to a parent entity. The item elements to publish MUST have at least
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* a 'jid' attribute specifying the Entity ID of the item, and an action attribute which
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* specifies the action being taken for that item. Possible action values are: "update" and
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* "remove".
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*
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* @param entityID the address of the XMPP entity.
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* @param discoverItems the DiscoveryItems to publish.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public void publishItems(String entityID, DiscoverItems discoverItems)
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throws XMPPException {
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publishItems(entityID, null, discoverItems);
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}
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/**
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* Publishes new items to a parent entity and node. The item elements to publish MUST have at
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* least a 'jid' attribute specifying the Entity ID of the item, and an action attribute which
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* specifies the action being taken for that item. Possible action values are: "update" and
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* "remove".
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*
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* @param entityID the address of the XMPP entity.
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* @param node the attribute that supplements the 'jid' attribute.
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* @param discoverItems the DiscoveryItems to publish.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public void publishItems(String entityID, String node, DiscoverItems discoverItems)
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throws XMPPException {
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discoverItems.setType(IQ.Type.SET);
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discoverItems.setTo(entityID);
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discoverItems.setNode(node);
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// Create a packet collector to listen for a response.
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PacketCollector collector =
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connection.createPacketCollector(new PacketIDFilter(discoverItems.getPacketID()));
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connection.sendPacket(discoverItems);
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// Wait up to 5 seconds for a result.
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IQ result = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
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// Stop queuing results
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collector.cancel();
|
|
if (result == null) {
|
|
throw new XMPPException("No response from the server.");
|
|
}
|
|
if (result.getType() == IQ.Type.ERROR) {
|
|
throw new XMPPException(result.getError());
|
|
}
|
|
}
|
|
} |