mirror of
https://codeberg.org/Mercury-IM/Smack
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bb8dcc9874
This also moves the logic to send error IQ replies from "when there is no IQ provider registerd" to "when there is no IQ request handler registered". Which has for example the advantage that IQ parsing no longer asks for a connection instance.
760 lines
31 KiB
Java
760 lines
31 KiB
Java
/**
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*
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* Copyright 2003-2007 Jive Software.
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*
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* 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.disco;
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import org.jivesoftware.smack.SmackException.NoResponseException;
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import org.jivesoftware.smack.SmackException.NotConnectedException;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.ConnectionCreationListener;
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import org.jivesoftware.smack.Manager;
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import org.jivesoftware.smack.XMPPConnectionRegistry;
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import org.jivesoftware.smack.XMPPException.XMPPErrorException;
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import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
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import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
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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.PacketExtension;
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import org.jivesoftware.smack.packet.XMPPError;
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import org.jivesoftware.smackx.caps.EntityCapsManager;
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import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
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import org.jivesoftware.smackx.disco.packet.DiscoverItems;
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import org.jivesoftware.smackx.disco.packet.DiscoverInfo.Identity;
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import org.jivesoftware.smackx.xdata.packet.DataForm;
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import org.jxmpp.util.cache.Cache;
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import org.jxmpp.util.cache.ExpirationCache;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.WeakHashMap;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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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 extends Manager {
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private static final Logger LOGGER = Logger.getLogger(ServiceDiscoveryManager.class.getName());
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private static final String DEFAULT_IDENTITY_NAME = "Smack";
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private static final String DEFAULT_IDENTITY_CATEGORY = "client";
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private static final String DEFAULT_IDENTITY_TYPE = "pc";
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private static DiscoverInfo.Identity defaultIdentity = new Identity(DEFAULT_IDENTITY_CATEGORY,
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DEFAULT_IDENTITY_NAME, DEFAULT_IDENTITY_TYPE);
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private Set<DiscoverInfo.Identity> identities = new HashSet<DiscoverInfo.Identity>();
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private DiscoverInfo.Identity identity = defaultIdentity;
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private EntityCapsManager capsManager;
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private static Map<XMPPConnection, ServiceDiscoveryManager> instances = new WeakHashMap<>();
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private final Set<String> features = new HashSet<String>();
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private DataForm extendedInfo = null;
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private Map<String, NodeInformationProvider> nodeInformationProviders =
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new ConcurrentHashMap<String, NodeInformationProvider>();
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// Create a new ServiceDiscoveryManager on every established connection
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static {
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XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
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public void connectionCreated(XMPPConnection connection) {
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getInstanceFor(connection);
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}
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});
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}
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/**
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* Set the default identity all new connections will have. If unchanged the default identity is an
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* identity where category is set to 'client', type is set to 'pc' and name is set to 'Smack'.
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*
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* @param identity
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*/
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public static void setDefaultIdentity(DiscoverInfo.Identity identity) {
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defaultIdentity = identity;
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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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private ServiceDiscoveryManager(XMPPConnection connection) {
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super(connection);
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addFeature(DiscoverInfo.NAMESPACE);
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addFeature(DiscoverItems.NAMESPACE);
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// Listen for disco#items requests and answer with an empty result
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connection.registerIQRequestHandler(new AbstractIqRequestHandler(DiscoverItems.ELEMENT, DiscoverItems.NAMESPACE, IQ.Type.get, Mode.async) {
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@Override
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public IQ handleIQRequest(IQ iqRequest) {
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DiscoverItems discoverItems = (DiscoverItems) iqRequest;
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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 = getNodeInformationProvider(discoverItems.getNode());
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if (nodeInformationProvider != null) {
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// Specified node was found, add node items
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response.addItems(nodeInformationProvider.getNodeItems());
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// Add packet extensions
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response.addExtensions(nodeInformationProvider.getNodePacketExtensions());
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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(XMPPError.Condition.item_not_found));
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}
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return response;
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}
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});
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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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connection.registerIQRequestHandler(new AbstractIqRequestHandler(DiscoverInfo.ELEMENT, DiscoverInfo.NAMESPACE, IQ.Type.get, Mode.async) {
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@Override
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public IQ handleIQRequest(IQ iqRequest) {
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DiscoverInfo discoverInfo = (DiscoverInfo) iqRequest;
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// Answer the client's supported features if the request is of the GET type
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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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// and if the request was not send to a node. If Entity Caps are
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// enabled the client's identity and features are may also added
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// if the right node is chosen
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if (discoverInfo.getNode() == null) {
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addDiscoverInfoTo(response);
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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 = getNodeInformationProvider(discoverInfo.getNode());
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if (nodeInformationProvider != null) {
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// Node was found. Add node features
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response.addFeatures(nodeInformationProvider.getNodeFeatures());
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// Add node identities
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response.addIdentities(nodeInformationProvider.getNodeIdentities());
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// Add packet extensions
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response.addExtensions(nodeInformationProvider.getNodePacketExtensions());
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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(XMPPError.Condition.item_not_found));
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}
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}
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return response;
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}
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});
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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 String getIdentityName() {
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return identity.getName();
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}
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/**
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* Sets the default identity the client will report.
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*
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* @param identity
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*/
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public void setIdentity(Identity identity) {
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if (identity == null) throw new IllegalArgumentException("Identity can not be null");
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this.identity = identity;
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renewEntityCapsVersion();
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}
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/**
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* Return the default identity of the client.
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*
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* @return the default identity.
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*/
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public Identity getIdentity() {
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return identity;
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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://xmpp.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 String getIdentityType() {
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return identity.getType();
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}
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/**
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* Add an further identity to the client.
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*
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* @param identity
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*/
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public void addIdentity(DiscoverInfo.Identity identity) {
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identities.add(identity);
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renewEntityCapsVersion();
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}
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/**
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* Remove an identity from the client. Note that the client needs at least one identity, the default identity, which
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* can not be removed.
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*
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* @param identity
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* @return true, if successful. Otherwise the default identity was given.
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*/
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public boolean removeIdentity(DiscoverInfo.Identity identity) {
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if (identity.equals(this.identity)) return false;
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identities.remove(identity);
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renewEntityCapsVersion();
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return true;
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}
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/**
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* Returns all identities of this client as unmodifiable Collection
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*
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* @return all identies as set
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*/
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public Set<DiscoverInfo.Identity> getIdentities() {
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Set<Identity> res = new HashSet<Identity>(identities);
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// Add the default identity that must exist
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res.add(defaultIdentity);
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return Collections.unmodifiableSet(res);
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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 synchronized ServiceDiscoveryManager getInstanceFor(XMPPConnection connection) {
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ServiceDiscoveryManager sdm = instances.get(connection);
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if (sdm == null) {
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sdm = new ServiceDiscoveryManager(connection);
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// Register the new instance and associate it with the connection
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instances.put(connection, sdm);
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}
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return sdm;
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}
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/**
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* Add discover info response data.
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*
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* @see <a href="http://xmpp.org/extensions/xep-0030.html#info-basic">XEP-30 Basic Protocol; Example 2</a>
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*
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* @param response the discover info response packet
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*/
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public void addDiscoverInfoTo(DiscoverInfo response) {
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// First add the identities of the connection
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response.addIdentities(getIdentities());
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// Add the registered features to the response
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synchronized (features) {
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for (String feature : getFeatures()) {
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response.addFeature(feature);
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}
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response.addExtension(extendedInfo);
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}
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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 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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* <p>
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* The result is a copied modifiable list of the original features.
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* </p>
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*
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* @return a List of the supported features by this XMPP entity.
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*/
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public List<String> getFeatures() {
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synchronized (features) {
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return new ArrayList<String>(features);
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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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if (!features.contains(feature)) {
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features.add(feature);
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renewEntityCapsVersion();
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}
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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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renewEntityCapsVersion();
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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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* Registers extended discovery information of this XMPP entity. When this
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* client is queried for its information this data form will be returned as
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* specified by XEP-0128.
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* <p>
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*
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* Since no packet is actually sent to the server it is safe to perform this
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* operation before logging to the server. In fact, you may want to
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* configure the extended info before logging to the server so that the
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* information is already available if it is required upon login.
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*
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* @param info
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* the data form that contains the extend service discovery
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* information.
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*/
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public void setExtendedInfo(DataForm info) {
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extendedInfo = info;
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renewEntityCapsVersion();
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}
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/**
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* Returns the data form that is set as extended information for this Service Discovery instance (XEP-0128)
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*
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* @see <a href="http://xmpp.org/extensions/xep-0128.html">XEP-128: Service Discovery Extensions</a>
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* @return the data form
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*/
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public DataForm getExtendedInfo() {
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return extendedInfo;
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}
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/**
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* Returns the data form as List of PacketExtensions, or null if no data form is set.
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* This representation is needed by some classes (e.g. EntityCapsManager, NodeInformationProvider)
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*
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* @return the data form as List of PacketExtensions
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*/
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public List<PacketExtension> getExtendedInfoAsList() {
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List<PacketExtension> res = null;
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if (extendedInfo != null) {
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res = new ArrayList<PacketExtension>(1);
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res.add(extendedInfo);
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}
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return res;
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}
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/**
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* Removes the data form containing extended service discovery information
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* from the information returned 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
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* operation before logging to the server.
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*/
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public void removeExtendedInfo() {
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extendedInfo = null;
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renewEntityCapsVersion();
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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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* Use null as entityID to query the server
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*
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* @param entityID the address of the XMPP entity or null.
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* @return the discovered information.
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* @throws XMPPErrorException
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* @throws NoResponseException
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* @throws NotConnectedException
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*/
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public DiscoverInfo discoverInfo(String entityID) throws NoResponseException, XMPPErrorException, NotConnectedException {
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if (entityID == null)
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return discoverInfo(null, null);
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// Check if the have it cached in the Entity Capabilities Manager
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DiscoverInfo info = EntityCapsManager.getDiscoverInfoByUser(entityID);
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if (info != null) {
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// We were able to retrieve the information from Entity Caps and
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// avoided a disco request, hurray!
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return info;
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}
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// Try to get the newest node#version if it's known, otherwise null is
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// returned
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EntityCapsManager.NodeVerHash nvh = EntityCapsManager.getNodeVerHashByJid(entityID);
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// Discover by requesting the information from the remote entity
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// Note that wee need to use NodeVer as argument for Node if it exists
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info = discoverInfo(entityID, nvh != null ? nvh.getNodeVer() : null);
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// If the node version is known, store the new entry.
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if (nvh != null) {
|
|
if (EntityCapsManager.verifyDiscoverInfoVersion(nvh.getVer(), nvh.getHash(), info))
|
|
EntityCapsManager.addDiscoverInfoByNode(nvh.getNodeVer(), info);
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
/**
|
|
* Returns the discovered information of a given XMPP entity addressed by its JID and
|
|
* note attribute. Use this message only when trying to query information which is not
|
|
* directly addressable.
|
|
*
|
|
* @see <a href="http://xmpp.org/extensions/xep-0030.html#info-basic">XEP-30 Basic Protocol</a>
|
|
* @see <a href="http://xmpp.org/extensions/xep-0030.html#info-nodes">XEP-30 Info Nodes</a>
|
|
*
|
|
* @param entityID the address of the XMPP entity.
|
|
* @param node the optional attribute that supplements the 'jid' attribute.
|
|
* @return the discovered information.
|
|
* @throws XMPPErrorException if the operation failed for some reason.
|
|
* @throws NoResponseException if there was no response from the server.
|
|
* @throws NotConnectedException
|
|
*/
|
|
public DiscoverInfo discoverInfo(String entityID, String node) throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
// Discover the entity's info
|
|
DiscoverInfo disco = new DiscoverInfo();
|
|
disco.setType(IQ.Type.get);
|
|
disco.setTo(entityID);
|
|
disco.setNode(node);
|
|
|
|
Packet result = connection().createPacketCollectorAndSend(disco).nextResultOrThrow();
|
|
|
|
return (DiscoverInfo) result;
|
|
}
|
|
|
|
/**
|
|
* Returns the discovered items of a given XMPP entity addressed by its JID.
|
|
*
|
|
* @param entityID the address of the XMPP entity.
|
|
* @return the discovered information.
|
|
* @throws XMPPErrorException if the operation failed for some reason.
|
|
* @throws NoResponseException if there was no response from the server.
|
|
* @throws NotConnectedException
|
|
*/
|
|
public DiscoverItems discoverItems(String entityID) throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
return discoverItems(entityID, null);
|
|
}
|
|
|
|
/**
|
|
* Returns the discovered items of a given XMPP entity addressed by its JID and
|
|
* note attribute. Use this message only when trying to query information which is not
|
|
* directly addressable.
|
|
*
|
|
* @param entityID the address of the XMPP entity.
|
|
* @param node the optional attribute that supplements the 'jid' attribute.
|
|
* @return the discovered items.
|
|
* @throws XMPPErrorException if the operation failed for some reason.
|
|
* @throws NoResponseException if there was no response from the server.
|
|
* @throws NotConnectedException
|
|
*/
|
|
public DiscoverItems discoverItems(String entityID, String node) throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
// Discover the entity's items
|
|
DiscoverItems disco = new DiscoverItems();
|
|
disco.setType(IQ.Type.get);
|
|
disco.setTo(entityID);
|
|
disco.setNode(node);
|
|
|
|
Packet result = connection().createPacketCollectorAndSend(disco).nextResultOrThrow();
|
|
return (DiscoverItems) result;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the server supports publishing of items. A client may wish to publish items
|
|
* to the server so that the server can provide items associated to the client. These items will
|
|
* be returned by the server whenever the server receives a disco request targeted to the bare
|
|
* address of the client (i.e. user@host.com).
|
|
*
|
|
* @param entityID the address of the XMPP entity.
|
|
* @return true if the server supports publishing of items.
|
|
* @throws XMPPErrorException
|
|
* @throws NoResponseException
|
|
* @throws NotConnectedException
|
|
*/
|
|
public boolean canPublishItems(String entityID) throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
DiscoverInfo info = discoverInfo(entityID);
|
|
return canPublishItems(info);
|
|
}
|
|
|
|
/**
|
|
* Returns true if the server supports publishing of items. A client may wish to publish items
|
|
* to the server so that the server can provide items associated to the client. These items will
|
|
* be returned by the server whenever the server receives a disco request targeted to the bare
|
|
* address of the client (i.e. user@host.com).
|
|
*
|
|
* @param info the discover info packet to check.
|
|
* @return true if the server supports publishing of items.
|
|
*/
|
|
public static boolean canPublishItems(DiscoverInfo info) {
|
|
return info.containsFeature("http://jabber.org/protocol/disco#publish");
|
|
}
|
|
|
|
/**
|
|
* Publishes new items to a parent entity. The item elements to publish MUST have at least
|
|
* a 'jid' attribute specifying the Entity ID of the item, and an action attribute which
|
|
* specifies the action being taken for that item. Possible action values are: "update" and
|
|
* "remove".
|
|
*
|
|
* @param entityID the address of the XMPP entity.
|
|
* @param discoverItems the DiscoveryItems to publish.
|
|
* @throws XMPPErrorException
|
|
* @throws NoResponseException
|
|
* @throws NotConnectedException
|
|
*/
|
|
public void publishItems(String entityID, DiscoverItems discoverItems) throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
publishItems(entityID, null, discoverItems);
|
|
}
|
|
|
|
/**
|
|
* Publishes new items to a parent entity and node. The item elements to publish MUST have at
|
|
* least a 'jid' attribute specifying the Entity ID of the item, and an action attribute which
|
|
* specifies the action being taken for that item. Possible action values are: "update" and
|
|
* "remove".
|
|
*
|
|
* @param entityID the address of the XMPP entity.
|
|
* @param node the attribute that supplements the 'jid' attribute.
|
|
* @param discoverItems the DiscoveryItems to publish.
|
|
* @throws XMPPErrorException if the operation failed for some reason.
|
|
* @throws NoResponseException if there was no response from the server.
|
|
* @throws NotConnectedException
|
|
*/
|
|
public void publishItems(String entityID, String node, DiscoverItems discoverItems) throws NoResponseException, XMPPErrorException, NotConnectedException
|
|
{
|
|
discoverItems.setType(IQ.Type.set);
|
|
discoverItems.setTo(entityID);
|
|
discoverItems.setNode(node);
|
|
|
|
connection().createPacketCollectorAndSend(discoverItems).nextResultOrThrow();
|
|
}
|
|
|
|
/**
|
|
* Queries the remote entity for it's features and returns true if the given feature is found.
|
|
*
|
|
* @param jid the JID of the remote entity
|
|
* @param feature
|
|
* @return true if the entity supports the feature, false otherwise
|
|
* @throws XMPPErrorException
|
|
* @throws NoResponseException
|
|
* @throws NotConnectedException
|
|
*/
|
|
public boolean supportsFeature(String jid, String feature) throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
DiscoverInfo result = discoverInfo(jid);
|
|
return result.containsFeature(feature);
|
|
}
|
|
|
|
/**
|
|
* Create a cache to hold the 25 most recently lookup services for a given feature for a period
|
|
* of 24 hours.
|
|
*/
|
|
private Cache<String, List<String>> services = new ExpirationCache<String, List<String>>(25,
|
|
24 * 60 * 60 * 1000);
|
|
|
|
/**
|
|
* Find all services under the users service that provide a given feature.
|
|
*
|
|
* @param feature the feature to search for
|
|
* @param stopOnFirst if true, stop searching after the first service was found
|
|
* @param useCache if true, query a cache first to avoid network I/O
|
|
* @return a possible empty list of services providing the given feature
|
|
* @throws NoResponseException
|
|
* @throws XMPPErrorException
|
|
* @throws NotConnectedException
|
|
*/
|
|
public List<String> findServices(String feature, boolean stopOnFirst, boolean useCache)
|
|
throws NoResponseException, XMPPErrorException, NotConnectedException {
|
|
List<String> serviceAddresses = null;
|
|
String serviceName = connection().getServiceName();
|
|
if (useCache) {
|
|
serviceAddresses = (List<String>) services.get(feature);
|
|
if (serviceAddresses != null) {
|
|
return serviceAddresses;
|
|
}
|
|
}
|
|
serviceAddresses = new LinkedList<String>();
|
|
// Send the disco packet to the server itself
|
|
DiscoverInfo info;
|
|
try {
|
|
info = discoverInfo(serviceName);
|
|
} catch (XMPPErrorException e) {
|
|
// Be extra robust here: Return the empty linked list and log this situation
|
|
LOGGER.log(Level.WARNING, "Could not discover information about service", e);
|
|
return serviceAddresses;
|
|
}
|
|
// Check if the server supports XEP-33
|
|
if (info.containsFeature(feature)) {
|
|
serviceAddresses.add(serviceName);
|
|
if (stopOnFirst) {
|
|
if (useCache) {
|
|
// Cache the discovered information
|
|
services.put(feature, serviceAddresses);
|
|
}
|
|
return serviceAddresses;
|
|
}
|
|
}
|
|
DiscoverItems items;
|
|
try {
|
|
// Get the disco items and send the disco packet to each server item
|
|
items = discoverItems(serviceName);
|
|
} catch(XMPPErrorException e) {
|
|
LOGGER.log(Level.WARNING, "Could not discover items about service", e);
|
|
return serviceAddresses;
|
|
}
|
|
for (DiscoverItems.Item item : items.getItems()) {
|
|
try {
|
|
// TODO is it OK here in all cases to query without the node attribute?
|
|
// MultipleRecipientManager queried initially also with the node attribute, but this
|
|
// could be simply a fault instead of intentional.
|
|
info = discoverInfo(item.getEntityID());
|
|
}
|
|
catch (XMPPErrorException | NoResponseException e) {
|
|
// Don't throw this exceptions if one of the server's items fail
|
|
LOGGER.log(Level.WARNING, "Exception while discovering info for feature " + feature
|
|
+ " of " + item.getEntityID() + " node: " + item.getNode(), e);
|
|
continue;
|
|
}
|
|
if (info.containsFeature(feature)) {
|
|
serviceAddresses.add(item.getEntityID());
|
|
if (stopOnFirst) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (useCache) {
|
|
// Cache the discovered information
|
|
services.put(feature, serviceAddresses);
|
|
}
|
|
return serviceAddresses;
|
|
}
|
|
|
|
/**
|
|
* Entity Capabilities
|
|
*/
|
|
|
|
/**
|
|
* Loads the ServiceDiscoveryManager with an EntityCapsManger that speeds up certain lookups.
|
|
*
|
|
* @param manager
|
|
*/
|
|
public void setEntityCapsManager(EntityCapsManager manager) {
|
|
capsManager = manager;
|
|
}
|
|
|
|
/**
|
|
* Updates the Entity Capabilities Verification String if EntityCaps is enabled.
|
|
*/
|
|
private void renewEntityCapsVersion() {
|
|
if (capsManager != null && capsManager.entityCapsEnabled())
|
|
capsManager.updateLocalEntityCaps();
|
|
}
|
|
}
|