mirror of
https://codeberg.org/Mercury-IM/Smack
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0e6817dc4f
Don't use the constructor in ConnectionCreationListener to prevent duplicate instances for the same connection. Fixed EntityCaps documentation. git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13799 b35dd754-fafc-0310-a699-88a17e54d16e
700 lines
25 KiB
Java
700 lines
25 KiB
Java
/**
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* Copyright 2009 Jonas Ådahl.
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* Copyright 2011-2013 Florian Schmaus
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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.entitycaps;
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import org.jivesoftware.smack.Connection;
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import org.jivesoftware.smack.ConnectionCreationListener;
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import org.jivesoftware.smack.ConnectionListener;
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import org.jivesoftware.smack.PacketInterceptor;
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import org.jivesoftware.smack.PacketListener;
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import org.jivesoftware.smack.SmackConfiguration;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.XMPPException;
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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.Presence;
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import org.jivesoftware.smack.filter.NotFilter;
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import org.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.filter.AndFilter;
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import org.jivesoftware.smack.filter.PacketTypeFilter;
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import org.jivesoftware.smack.filter.PacketExtensionFilter;
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import org.jivesoftware.smack.util.Base64;
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import org.jivesoftware.smack.util.Cache;
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import org.jivesoftware.smackx.Form;
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import org.jivesoftware.smackx.FormField;
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import org.jivesoftware.smackx.NodeInformationProvider;
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import org.jivesoftware.smackx.ServiceDiscoveryManager;
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import org.jivesoftware.smackx.entitycaps.cache.EntityCapsPersistentCache;
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import org.jivesoftware.smackx.entitycaps.packet.CapsExtension;
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import org.jivesoftware.smackx.packet.DiscoverInfo;
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import org.jivesoftware.smackx.packet.DataForm;
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import org.jivesoftware.smackx.packet.DiscoverInfo.Feature;
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import org.jivesoftware.smackx.packet.DiscoverInfo.Identity;
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import org.jivesoftware.smackx.packet.DiscoverItems.Item;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.Iterator;
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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.Queue;
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import java.util.SortedSet;
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import java.util.TreeSet;
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import java.util.WeakHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.io.IOException;
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import java.lang.ref.WeakReference;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* Keeps track of entity capabilities.
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*
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* @author Florian Schmaus
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*/
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public class EntityCapsManager {
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public static final String NAMESPACE = "http://jabber.org/protocol/caps";
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public static final String ELEMENT = "c";
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private static final String ENTITY_NODE = "http://www.igniterealtime.org/projects/smack";
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private static final Map<String, MessageDigest> SUPPORTED_HASHES = new HashMap<String, MessageDigest>();
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protected static EntityCapsPersistentCache persistentCache;
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private static Map<Connection, EntityCapsManager> instances = Collections
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.synchronizedMap(new WeakHashMap<Connection, EntityCapsManager>());
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/**
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* Map of (node + '#" + hash algorithm) to DiscoverInfo data
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*/
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protected static Map<String, DiscoverInfo> caps = new Cache<String, DiscoverInfo>(1000, -1);
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/**
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* Map of Full JID -> DiscoverInfo/null. In case of c2s connection the
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* key is formed as user@server/resource (resource is required) In case of
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* link-local connection the key is formed as user@host (no resource) In
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* case of a server or component the key is formed as domain
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*/
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protected static Map<String, NodeVerHash> jidCaps = new Cache<String, NodeVerHash>(10000, -1);
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static {
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Connection.addConnectionCreationListener(new ConnectionCreationListener() {
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public void connectionCreated(Connection connection) {
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getInstanceFor(connection);
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}
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});
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try {
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MessageDigest sha1MessageDigest = MessageDigest.getInstance("SHA-1");
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SUPPORTED_HASHES.put("sha-1", sha1MessageDigest);
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} catch (NoSuchAlgorithmException e) {
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// Ignore
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}
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}
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private WeakReference<Connection> weakRefConnection;
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private ServiceDiscoveryManager sdm;
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private boolean entityCapsEnabled;
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private String currentCapsVersion;
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private boolean presenceSend = false;
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private Queue<String> lastLocalCapsVersions = new ConcurrentLinkedQueue<String>();
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/**
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* Add DiscoverInfo to the database.
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*
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* @param nodeVer
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* The node and verification String (e.g.
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* "http://psi-im.org#q07IKJEyjvHSyhy//CH0CxmKi8w=").
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* @param info
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* DiscoverInfo for the specified node.
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*/
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public static void addDiscoverInfoByNode(String nodeVer, DiscoverInfo info) {
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caps.put(nodeVer, info);
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if (persistentCache != null)
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persistentCache.addDiscoverInfoByNodePersistent(nodeVer, info);
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}
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/**
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* Get the Node version (node#ver) of a JID. Returns a String or null if
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* EntiyCapsManager does not have any information.
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*
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* @param user
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* the user (Full JID)
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* @return the node version (node#ver) or null
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*/
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public static String getNodeVersionByJid(String jid) {
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NodeVerHash nvh = jidCaps.get(jid);
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if (nvh != null) {
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return nvh.nodeVer;
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} else {
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return null;
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}
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}
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public static NodeVerHash getNodeVerHashByJid(String jid) {
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return jidCaps.get(jid);
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}
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/**
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* Get the discover info given a user name. The discover info is returned if
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* the user has a node#ver associated with it and the node#ver has a
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* discover info associated with it.
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*
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* @param user
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* user name (Full JID)
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* @return the discovered info
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*/
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public static DiscoverInfo getDiscoverInfoByUser(String user) {
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NodeVerHash nvh = jidCaps.get(user);
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if (nvh == null)
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return null;
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return getDiscoveryInfoByNodeVer(nvh.nodeVer);
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}
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/**
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* Retrieve DiscoverInfo for a specific node.
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*
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* @param nodeVer
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* The node name (e.g.
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* "http://psi-im.org#q07IKJEyjvHSyhy//CH0CxmKi8w=").
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* @return The corresponding DiscoverInfo or null if none is known.
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*/
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public static DiscoverInfo getDiscoveryInfoByNodeVer(String nodeVer) {
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DiscoverInfo info = caps.get(nodeVer);
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if (info != null)
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info = new DiscoverInfo(info);
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return info;
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}
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/**
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* Set the persistent cache implementation
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*
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* @param cache
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* @throws IOException
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*/
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public static void setPersistentCache(EntityCapsPersistentCache cache) throws IOException {
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if (persistentCache != null)
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throw new IllegalStateException("Entity Caps Persistent Cache was already set");
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persistentCache = cache;
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persistentCache.replay();
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}
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/**
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* Sets the maximum Cache size for the JID to nodeVer Cache
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*
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* @param maxCacheSize
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*/
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@SuppressWarnings("rawtypes")
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public static void setJidCapsMaxCacheSize(int maxCacheSize) {
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((Cache) jidCaps).setMaxCacheSize(maxCacheSize);
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}
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/**
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* Sets the maximum Cache size for the nodeVer to DiscoverInfo Cache
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*
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* @param maxCacheSize
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*/
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@SuppressWarnings("rawtypes")
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public static void setCapsMaxCacheSize(int maxCacheSize) {
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((Cache) caps).setMaxCacheSize(maxCacheSize);
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}
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private EntityCapsManager(Connection connection) {
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this.weakRefConnection = new WeakReference<Connection>(connection);
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this.sdm = ServiceDiscoveryManager.getInstanceFor(connection);
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instances.put(connection, this);
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connection.addConnectionListener(new ConnectionListener() {
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public void connectionClosed() {
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presenceSend = false;
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}
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public void connectionClosedOnError(Exception e) {
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presenceSend = false;
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}
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public void reconnectionFailed(Exception e) {
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// ignore
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}
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public void reconnectingIn(int seconds) {
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// ignore
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}
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public void reconnectionSuccessful() {
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// ignore
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}
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});
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// This calculates the local entity caps version
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updateLocalEntityCaps();
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if (SmackConfiguration.autoEnableEntityCaps())
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enableEntityCaps();
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PacketFilter packetFilter = new AndFilter(new PacketTypeFilter(Presence.class), new PacketExtensionFilter(
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ELEMENT, NAMESPACE));
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connection.addPacketListener(new PacketListener() {
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// Listen for remote presence stanzas with the caps extension
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// If we receive such a stanza, record the JID and nodeVer
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@Override
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public void processPacket(Packet packet) {
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if (!entityCapsEnabled())
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return;
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CapsExtension ext = (CapsExtension) packet.getExtension(EntityCapsManager.ELEMENT,
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EntityCapsManager.NAMESPACE);
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String hash = ext.getHash().toLowerCase();
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if (!SUPPORTED_HASHES.containsKey(hash))
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return;
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String from = packet.getFrom();
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String node = ext.getNode();
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String ver = ext.getVer();
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jidCaps.put(from, new NodeVerHash(node, ver, hash));
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}
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}, packetFilter);
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packetFilter = new AndFilter(new PacketTypeFilter(Presence.class), new NotFilter(new PacketExtensionFilter(
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ELEMENT, NAMESPACE)));
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connection.addPacketListener(new PacketListener() {
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@Override
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public void processPacket(Packet packet) {
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// always remove the JID from the map, even if entityCaps are
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// disabled
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String from = packet.getFrom();
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jidCaps.remove(from);
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}
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}, packetFilter);
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packetFilter = new PacketTypeFilter(Presence.class);
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connection.addPacketSendingListener(new PacketListener() {
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@Override
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public void processPacket(Packet packet) {
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presenceSend = true;
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}
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}, packetFilter);
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// Intercept presence packages and add caps data when intended.
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// XEP-0115 specifies that a client SHOULD include entity capabilities
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// with every presence notification it sends.
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PacketFilter capsPacketFilter = new PacketTypeFilter(Presence.class);
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PacketInterceptor packetInterceptor = new PacketInterceptor() {
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public void interceptPacket(Packet packet) {
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if (!entityCapsEnabled)
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return;
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CapsExtension caps = new CapsExtension(ENTITY_NODE, getCapsVersion(), "sha-1");
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packet.addExtension(caps);
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}
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};
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connection.addPacketInterceptor(packetInterceptor, capsPacketFilter);
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// It's important to do this as last action. Since it changes the
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// behavior of the SDM in some ways
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sdm.setEntityCapsManager(this);
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}
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public static synchronized EntityCapsManager getInstanceFor(Connection connection) {
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if (SUPPORTED_HASHES.size() <= 0)
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throw new IllegalStateException("No supported hashes for EntityCapsManager");
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EntityCapsManager entityCapsManager = instances.get(connection);
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if (entityCapsManager == null) {
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entityCapsManager = new EntityCapsManager(connection);
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}
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return entityCapsManager;
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}
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public void enableEntityCaps() {
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// Add Entity Capabilities (XEP-0115) feature node.
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sdm.addFeature(NAMESPACE);
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updateLocalEntityCaps();
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entityCapsEnabled = true;
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}
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public void disableEntityCaps() {
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entityCapsEnabled = false;
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sdm.removeFeature(NAMESPACE);
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}
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public boolean entityCapsEnabled() {
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return entityCapsEnabled;
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}
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/**
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* Remove a record telling what entity caps node a user has.
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*
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* @param user
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* the user (Full JID)
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*/
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public void removeUserCapsNode(String user) {
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jidCaps.remove(user);
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}
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/**
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* Get our own caps version. The version depends on the enabled features. A
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* caps version looks like '66/0NaeaBKkwk85efJTGmU47vXI='
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*
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* @return our own caps version
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*/
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public String getCapsVersion() {
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return currentCapsVersion;
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}
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/**
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* Returns the local entity's NodeVer (e.g.
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* "http://www.igniterealtime.org/projects/smack/#66/0NaeaBKkwk85efJTGmU47vXI=
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* )
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*
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* @return
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*/
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public String getLocalNodeVer() {
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return ENTITY_NODE + '#' + getCapsVersion();
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}
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/**
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* Returns true if Entity Caps are supported by a given JID
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*
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* @param jid
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* @return
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*/
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public boolean areEntityCapsSupported(String jid) {
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if (jid == null)
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return false;
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try {
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DiscoverInfo result = sdm.discoverInfo(jid);
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return result.containsFeature(NAMESPACE);
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} catch (XMPPException e) {
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return false;
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}
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}
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/**
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* Returns true if Entity Caps are supported by the local service/server
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*
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* @return
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*/
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public boolean areEntityCapsSupportedByServer() {
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return areEntityCapsSupported(weakRefConnection.get().getServiceName());
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}
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/**
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* Updates the local user Entity Caps information with the data provided
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*
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* If we are connected and there was already a presence send, another
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* presence is send to inform others about your new Entity Caps node string.
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*
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* @param discoverInfo
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* the local users discover info (mostly the service discovery
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* features)
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* @param identityType
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* the local users identity type
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* @param identityName
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* the local users identity name
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* @param extendedInfo
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* the local users extended info
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*/
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public void updateLocalEntityCaps() {
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Connection connection = weakRefConnection.get();
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DiscoverInfo discoverInfo = new DiscoverInfo();
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discoverInfo.setType(IQ.Type.RESULT);
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discoverInfo.setNode(getLocalNodeVer());
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if (connection != null)
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discoverInfo.setFrom(connection.getUser());
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sdm.addDiscoverInfoTo(discoverInfo);
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currentCapsVersion = generateVerificationString(discoverInfo, "sha-1");
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addDiscoverInfoByNode(ENTITY_NODE + '#' + currentCapsVersion, discoverInfo);
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if (lastLocalCapsVersions.size() > 10) {
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String oldCapsVersion = lastLocalCapsVersions.poll();
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sdm.removeNodeInformationProvider(ENTITY_NODE + '#' + oldCapsVersion);
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}
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lastLocalCapsVersions.add(currentCapsVersion);
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caps.put(currentCapsVersion, discoverInfo);
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if (connection != null)
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jidCaps.put(connection.getUser(), new NodeVerHash(ENTITY_NODE, currentCapsVersion, "sha-1"));
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sdm.setNodeInformationProvider(ENTITY_NODE + '#' + currentCapsVersion, new NodeInformationProvider() {
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List<String> features = sdm.getFeaturesList();
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List<Identity> identities = new LinkedList<Identity>(ServiceDiscoveryManager.getIdentities());
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List<PacketExtension> packetExtensions = sdm.getExtendedInfoAsList();
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@Override
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public List<Item> getNodeItems() {
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return null;
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}
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@Override
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public List<String> getNodeFeatures() {
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return features;
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}
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@Override
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public List<Identity> getNodeIdentities() {
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return identities;
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}
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@Override
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public List<PacketExtension> getNodePacketExtensions() {
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return packetExtensions;
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}
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});
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// Send an empty presence, and let the packet intercepter
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// add a <c/> node to it.
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// See http://xmpp.org/extensions/xep-0115.html#advertise
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// We only send a presence packet if there was already one send
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// to respect ConnectionConfiguration.isSendPresence()
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if (connection != null && connection.isAuthenticated() && presenceSend) {
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Presence presence = new Presence(Presence.Type.available);
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connection.sendPacket(presence);
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}
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}
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/**
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* Verify DisoverInfo and Caps Node as defined in XEP-0115 5.4 Processing
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* Method
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*
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* @see <a href="http://xmpp.org/extensions/xep-0115.html#ver-proc">XEP-0115
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* 5.4 Processing Method</a>
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*
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* @param capsNode
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* the caps node (i.e. node#ver)
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* @param info
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* @return true if it's valid and should be cache, false if not
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*/
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public static boolean verifyDiscoverInfoVersion(String ver, String hash, DiscoverInfo info) {
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// step 3.3 check for duplicate identities
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if (info.containsDuplicateIdentities())
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return false;
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// step 3.4 check for duplicate features
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if (info.containsDuplicateFeatures())
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return false;
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// step 3.5 check for well-formed packet extensions
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if (verifyPacketExtensions(info))
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return false;
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String calculatedVer = generateVerificationString(info, hash);
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if (!ver.equals(calculatedVer))
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return false;
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return true;
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}
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/**
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*
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* @param info
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* @return true if the packet extensions is ill-formed
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*/
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protected static boolean verifyPacketExtensions(DiscoverInfo info) {
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List<FormField> foundFormTypes = new LinkedList<FormField>();
|
|
for (Iterator<PacketExtension> i = info.getExtensions().iterator(); i.hasNext();) {
|
|
PacketExtension pe = i.next();
|
|
if (pe.getNamespace().equals(Form.NAMESPACE)) {
|
|
DataForm df = (DataForm) pe;
|
|
for (Iterator<FormField> it = df.getFields(); it.hasNext();) {
|
|
FormField f = it.next();
|
|
if (f.getVariable().equals("FORM_TYPE")) {
|
|
for (FormField fft : foundFormTypes) {
|
|
if (f.equals(fft))
|
|
return true;
|
|
}
|
|
foundFormTypes.add(f);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Generates a XEP-115 Verification String
|
|
*
|
|
* @see <a href="http://xmpp.org/extensions/xep-0115.html#ver">XEP-115
|
|
* Verification String</a>
|
|
*
|
|
* @param discoverInfo
|
|
* @param hash
|
|
* the used hash function
|
|
* @return The generated verification String or null if the hash is not
|
|
* supported
|
|
*/
|
|
protected static String generateVerificationString(DiscoverInfo discoverInfo, String hash) {
|
|
MessageDigest md = SUPPORTED_HASHES.get(hash.toLowerCase());
|
|
if (md == null)
|
|
return null;
|
|
|
|
DataForm extendedInfo = (DataForm) discoverInfo.getExtension(Form.ELEMENT, Form.NAMESPACE);
|
|
|
|
// 1. Initialize an empty string S ('sb' in this method).
|
|
StringBuilder sb = new StringBuilder(); // Use StringBuilder as we don't
|
|
// need thread-safe StringBuffer
|
|
|
|
// 2. Sort the service discovery identities by category and then by
|
|
// type and then by xml:lang
|
|
// (if it exists), formatted as CATEGORY '/' [TYPE] '/' [LANG] '/'
|
|
// [NAME]. Note that each slash is included even if the LANG or
|
|
// NAME is not included (in accordance with XEP-0030, the category and
|
|
// type MUST be included.
|
|
SortedSet<DiscoverInfo.Identity> sortedIdentities = new TreeSet<DiscoverInfo.Identity>();
|
|
|
|
for (Iterator<DiscoverInfo.Identity> it = discoverInfo.getIdentities(); it.hasNext();)
|
|
sortedIdentities.add(it.next());
|
|
|
|
// 3. For each identity, append the 'category/type/lang/name' to S,
|
|
// followed by the '<' character.
|
|
for (Iterator<DiscoverInfo.Identity> it = sortedIdentities.iterator(); it.hasNext();) {
|
|
DiscoverInfo.Identity identity = it.next();
|
|
sb.append(identity.getCategory());
|
|
sb.append("/");
|
|
sb.append(identity.getType());
|
|
sb.append("/");
|
|
sb.append(identity.getLanguage() == null ? "" : identity.getLanguage());
|
|
sb.append("/");
|
|
sb.append(identity.getName() == null ? "" : identity.getName());
|
|
sb.append("<");
|
|
}
|
|
|
|
// 4. Sort the supported service discovery features.
|
|
SortedSet<String> features = new TreeSet<String>();
|
|
for (Iterator<Feature> it = discoverInfo.getFeatures(); it.hasNext();)
|
|
features.add(it.next().getVar());
|
|
|
|
// 5. For each feature, append the feature to S, followed by the '<'
|
|
// character
|
|
for (String f : features) {
|
|
sb.append(f);
|
|
sb.append("<");
|
|
}
|
|
|
|
// only use the data form for calculation is it has a hidden FORM_TYPE
|
|
// field
|
|
// see XEP-0115 5.4 step 3.6
|
|
if (extendedInfo != null && extendedInfo.hasHiddenFormTypeField()) {
|
|
synchronized (extendedInfo) {
|
|
// 6. If the service discovery information response includes
|
|
// XEP-0128 data forms, sort the forms by the FORM_TYPE (i.e.,
|
|
// by the XML character data of the <value/> element).
|
|
SortedSet<FormField> fs = new TreeSet<FormField>(new Comparator<FormField>() {
|
|
public int compare(FormField f1, FormField f2) {
|
|
return f1.getVariable().compareTo(f2.getVariable());
|
|
}
|
|
});
|
|
|
|
FormField ft = null;
|
|
|
|
for (Iterator<FormField> i = extendedInfo.getFields(); i.hasNext();) {
|
|
FormField f = i.next();
|
|
if (!f.getVariable().equals("FORM_TYPE")) {
|
|
fs.add(f);
|
|
} else {
|
|
ft = f;
|
|
}
|
|
}
|
|
|
|
// Add FORM_TYPE values
|
|
if (ft != null) {
|
|
formFieldValuesToCaps(ft.getValues(), sb);
|
|
}
|
|
|
|
// 7. 3. For each field other than FORM_TYPE:
|
|
// 1. Append the value of the "var" attribute, followed by the
|
|
// '<' character.
|
|
// 2. Sort values by the XML character data of the <value/>
|
|
// element.
|
|
// 3. For each <value/> element, append the XML character data,
|
|
// followed by the '<' character.
|
|
for (FormField f : fs) {
|
|
sb.append(f.getVariable());
|
|
sb.append("<");
|
|
formFieldValuesToCaps(f.getValues(), sb);
|
|
}
|
|
}
|
|
}
|
|
// 8. Ensure that S is encoded according to the UTF-8 encoding (RFC
|
|
// 3269).
|
|
// 9. Compute the verification string by hashing S using the algorithm
|
|
// specified in the 'hash' attribute (e.g., SHA-1 as defined in RFC
|
|
// 3174).
|
|
// The hashed data MUST be generated with binary output and
|
|
// encoded using Base64 as specified in Section 4 of RFC 4648
|
|
// (note: the Base64 output MUST NOT include whitespace and MUST set
|
|
// padding bits to zero).
|
|
byte[] digest = md.digest(sb.toString().getBytes());
|
|
return Base64.encodeBytes(digest);
|
|
}
|
|
|
|
private static void formFieldValuesToCaps(Iterator<String> i, StringBuilder sb) {
|
|
SortedSet<String> fvs = new TreeSet<String>();
|
|
while (i.hasNext()) {
|
|
fvs.add(i.next());
|
|
}
|
|
for (String fv : fvs) {
|
|
sb.append(fv);
|
|
sb.append("<");
|
|
}
|
|
}
|
|
|
|
public static class NodeVerHash {
|
|
private String node;
|
|
private String hash;
|
|
private String ver;
|
|
private String nodeVer;
|
|
|
|
NodeVerHash(String node, String ver, String hash) {
|
|
this.node = node;
|
|
this.ver = ver;
|
|
this.hash = hash;
|
|
nodeVer = node + "#" + ver;
|
|
}
|
|
|
|
public String getNodeVer() {
|
|
return nodeVer;
|
|
}
|
|
|
|
public String getNode() {
|
|
return node;
|
|
}
|
|
|
|
public String getHash() {
|
|
return hash;
|
|
}
|
|
|
|
public String getVer() {
|
|
return ver;
|
|
}
|
|
}
|
|
}
|