/**
* Copyright 2009 Jonas Ådahl.
* Copyright 2011-2013 Florian Schmaus
*
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.entitycaps;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.ConnectionCreationListener;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.PacketInterceptor;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.filter.NotFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.filter.AndFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.filter.PacketExtensionFilter;
import org.jivesoftware.smack.util.Base64;
import org.jivesoftware.smack.util.Cache;
import org.jivesoftware.smackx.Form;
import org.jivesoftware.smackx.FormField;
import org.jivesoftware.smackx.NodeInformationProvider;
import org.jivesoftware.smackx.ServiceDiscoveryManager;
import org.jivesoftware.smackx.entitycaps.cache.EntityCapsPersistentCache;
import org.jivesoftware.smackx.entitycaps.packet.CapsExtension;
import org.jivesoftware.smackx.packet.DiscoverInfo;
import org.jivesoftware.smackx.packet.DataForm;
import org.jivesoftware.smackx.packet.DiscoverInfo.Feature;
import org.jivesoftware.smackx.packet.DiscoverInfo.Identity;
import org.jivesoftware.smackx.packet.DiscoverItems.Item;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Keeps track of entity capabilities.
*
* @author Florian Schmaus
*/
public class EntityCapsManager {
public static final String NAMESPACE = "http://jabber.org/protocol/caps";
public static final String ELEMENT = "c";
private static final String ENTITY_NODE = "http://www.igniterealtime.org/projects/smack";
private static final Map<String, MessageDigest> SUPPORTED_HASHES = new HashMap<String, MessageDigest>();
protected static EntityCapsPersistentCache persistentCache;
private static Map<Connection, EntityCapsManager> instances = Collections
.synchronizedMap(new WeakHashMap<Connection, EntityCapsManager>());
/**
* Map of (node + '#" + hash algorithm) to DiscoverInfo data
*/
protected static Map<String, DiscoverInfo> caps = new Cache<String, DiscoverInfo>(1000, -1);
/**
* Map of Full JID -> DiscoverInfo/null. In case of c2s connection the
* key is formed as user@server/resource (resource is required) In case of
* link-local connection the key is formed as user@host (no resource) In
* case of a server or component the key is formed as domain
*/
protected static Map<String, NodeVerHash> jidCaps = new Cache<String, NodeVerHash>(10000, -1);
static {
Connection.addConnectionCreationListener(new ConnectionCreationListener() {
public void connectionCreated(Connection connection) {
if (connection instanceof XMPPConnection)
new EntityCapsManager(connection);
}
});
try {
MessageDigest sha1MessageDigest = MessageDigest.getInstance("SHA-1");
SUPPORTED_HASHES.put("sha-1", sha1MessageDigest);
} catch (NoSuchAlgorithmException e) {
// Ignore
}
}
private WeakReference<Connection> weakRefConnection;
private ServiceDiscoveryManager sdm;
private boolean entityCapsEnabled;
private String currentCapsVersion;
private boolean presenceSend = false;
private Queue<String> lastLocalCapsVersions = new ConcurrentLinkedQueue<String>();
/**
* Add DiscoverInfo to the database.
*
* @param nodeVer
* The node and verification String (e.g.
* "http://psi-im.org#q07IKJEyjvHSyhy//CH0CxmKi8w=").
* @param info
* DiscoverInfo for the specified node.
*/
public static void addDiscoverInfoByNode(String nodeVer, DiscoverInfo info) {
caps.put(nodeVer, info);
if (persistentCache != null)
persistentCache.addDiscoverInfoByNodePersistent(nodeVer, info);
}
/**
* Get the Node version (node#ver) of a JID. Returns a String or null if
* EntiyCapsManager does not have any information.
*
* @param user
* the user (Full JID)
* @return the node version (node#ver) or null
*/
public static String getNodeVersionByJid(String jid) {
NodeVerHash nvh = jidCaps.get(jid);
if (nvh != null) {
return nvh.nodeVer;
} else {
return null;
}
}
public static NodeVerHash getNodeVerHashByJid(String jid) {
return jidCaps.get(jid);
}
/**
* Get the discover info given a user name. The discover info is returned if
* the user has a node#ver associated with it and the node#ver has a
* discover info associated with it.
*
* @param user
* user name (Full JID)
* @return the discovered info
*/
public static DiscoverInfo getDiscoverInfoByUser(String user) {
NodeVerHash nvh = jidCaps.get(user);
if (nvh == null)
return null;
return getDiscoveryInfoByNodeVer(nvh.nodeVer);
}
/**
* Retrieve DiscoverInfo for a specific node.
*
* @param nodeVer
* The node name (e.g.
* "http://psi-im.org#q07IKJEyjvHSyhy//CH0CxmKi8w=").
* @return The corresponding DiscoverInfo or null if none is known.
*/
public static DiscoverInfo getDiscoveryInfoByNodeVer(String nodeVer) {
DiscoverInfo info = caps.get(nodeVer);
if (info != null)
info = new DiscoverInfo(info);
return info;
}
/**
* Set the persistent cache implementation
*
* @param cache
* @throws IOException
*/
public static void setPersistentCache(EntityCapsPersistentCache cache) throws IOException {
if (persistentCache != null)
throw new IllegalStateException("Entity Caps Persistent Cache was already set");
persistentCache = cache;
persistentCache.replay();
}
/**
* Sets the maximum Cache size for the JID to nodeVer Cache
*
* @param maxCacheSize
*/
@SuppressWarnings("rawtypes")
public static void setJidCapsMaxCacheSize(int maxCacheSize) {
((Cache) jidCaps).setMaxCacheSize(maxCacheSize);
}
/**
* Sets the maximum Cache size for the nodeVer to DiscoverInfo Cache
*
* @param maxCacheSize
*/
@SuppressWarnings("rawtypes")
public static void setCapsMaxCacheSize(int maxCacheSize) {
((Cache) caps).setMaxCacheSize(maxCacheSize);
}
private EntityCapsManager(Connection connection) {
this.weakRefConnection = new WeakReference<Connection>(connection);
this.sdm = ServiceDiscoveryManager.getInstanceFor(connection);
init();
}
private void init() {
Connection connection = weakRefConnection.get();
instances.put(connection, this);
connection.addConnectionListener(new ConnectionListener() {
public void connectionClosed() {
// Unregister this instance since the connection has been closed
presenceSend = false;
instances.remove(weakRefConnection.get());
}
public void connectionClosedOnError(Exception e) {
presenceSend = false;
}
public void reconnectionFailed(Exception e) {
// ignore
}
public void reconnectingIn(int seconds) {
// ignore
}
public void reconnectionSuccessful() {
// ignore
}
});
// This calculates the local entity caps version
updateLocalEntityCaps();
if (SmackConfiguration.autoEnableEntityCaps())
enableEntityCaps();
PacketFilter packetFilter = new AndFilter(new PacketTypeFilter(Presence.class), new PacketExtensionFilter(
ELEMENT, NAMESPACE));
connection.addPacketListener(new PacketListener() {
// Listen for remote presence stanzas with the caps extension
// If we receive such a stanza, record the JID and nodeVer
@Override
public void processPacket(Packet packet) {
if (!entityCapsEnabled())
return;
CapsExtension ext = (CapsExtension) packet.getExtension(EntityCapsManager.ELEMENT,
EntityCapsManager.NAMESPACE);
String hash = ext.getHash().toLowerCase();
if (!SUPPORTED_HASHES.containsKey(hash))
return;
String from = packet.getFrom();
String node = ext.getNode();
String ver = ext.getVer();
jidCaps.put(from, new NodeVerHash(node, ver, hash));
}
}, packetFilter);
packetFilter = new AndFilter(new PacketTypeFilter(Presence.class), new NotFilter(new PacketExtensionFilter(
ELEMENT, NAMESPACE)));
connection.addPacketListener(new PacketListener() {
@Override
public void processPacket(Packet packet) {
// always remove the JID from the map, even if entityCaps are
// disabled
String from = packet.getFrom();
jidCaps.remove(from);
}
}, packetFilter);
packetFilter = new PacketTypeFilter(Presence.class);
connection.addPacketSendingListener(new PacketListener() {
@Override
public void processPacket(Packet packet) {
presenceSend = true;
}
}, packetFilter);
// Intercept presence packages and add caps data when intended.
// XEP-0115 specifies that a client SHOULD include entity capabilities
// with every presence notification it sends.
PacketFilter capsPacketFilter = new PacketTypeFilter(Presence.class);
PacketInterceptor packetInterceptor = new PacketInterceptor() {
public void interceptPacket(Packet packet) {
if (!entityCapsEnabled)
return;
CapsExtension caps = new CapsExtension(ENTITY_NODE, getCapsVersion(), "sha-1");
packet.addExtension(caps);
}
};
connection.addPacketInterceptor(packetInterceptor, capsPacketFilter);
// It's important to do this as last action. Since it changes the
// behavior of the SDM in some ways
sdm.setEntityCapsManager(this);
}
public static synchronized EntityCapsManager getInstanceFor(Connection connection) {
// For testing purposed forbid EntityCaps for non XMPPConnections
// it may work on BOSH connections too
if (!(connection instanceof XMPPConnection))
return null;
if (SUPPORTED_HASHES.size() <= 0)
return null;
EntityCapsManager entityCapsManager = instances.get(connection);
if (entityCapsManager == null) {
entityCapsManager = new EntityCapsManager(connection);
}
return entityCapsManager;
}
public void enableEntityCaps() {
// Add Entity Capabilities (XEP-0115) feature node.
sdm.addFeature(NAMESPACE);
updateLocalEntityCaps();
entityCapsEnabled = true;
}
public void disableEntityCaps() {
entityCapsEnabled = false;
sdm.removeFeature(NAMESPACE);
}
public boolean entityCapsEnabled() {
return entityCapsEnabled;
}
/**
* Remove a record telling what entity caps node a user has.
*
* @param user
* the user (Full JID)
*/
public void removeUserCapsNode(String user) {
jidCaps.remove(user);
}
/**
* Get our own caps version. The version depends on the enabled features. A
* caps version looks like '66/0NaeaBKkwk85efJTGmU47vXI='
*
* @return our own caps version
*/
public String getCapsVersion() {
return currentCapsVersion;
}
/**
* Returns the local entity's NodeVer (e.g.
* "http://www.igniterealtime.org/projects/smack/#66/0NaeaBKkwk85efJTGmU47vXI=
* )
*
* @return
*/
public String getLocalNodeVer() {
return ENTITY_NODE + '#' + getCapsVersion();
}
/**
* Returns true if Entity Caps are supported by a given JID
*
* @param jid
* @return
*/
public boolean areEntityCapsSupported(String jid) {
if (jid == null)
return false;
try {
DiscoverInfo result = sdm.discoverInfo(jid);
return result.containsFeature(NAMESPACE);
} catch (XMPPException e) {
return false;
}
}
/**
* Returns true if Entity Caps are supported by the local service/server
*
* @return
*/
public boolean areEntityCapsSupportedByServer() {
return areEntityCapsSupported(weakRefConnection.get().getServiceName());
}
/**
* Updates the local user Entity Caps information with the data provided
*
* If we are connected and there was already a presence send, another
* presence is send to inform others about your new Entity Caps node string.
*
* @param discoverInfo
* the local users discover info (mostly the service discovery
* features)
* @param identityType
* the local users identity type
* @param identityName
* the local users identity name
* @param extendedInfo
* the local users extended info
*/
public void updateLocalEntityCaps() {
Connection connection = weakRefConnection.get();
DiscoverInfo discoverInfo = new DiscoverInfo();
discoverInfo.setType(IQ.Type.RESULT);
discoverInfo.setNode(getLocalNodeVer());
if (connection != null)
discoverInfo.setFrom(connection.getUser());
sdm.addDiscoverInfoTo(discoverInfo);
currentCapsVersion = generateVerificationString(discoverInfo, "sha-1");
addDiscoverInfoByNode(ENTITY_NODE + '#' + currentCapsVersion, discoverInfo);
if (lastLocalCapsVersions.size() > 10) {
String oldCapsVersion = lastLocalCapsVersions.poll();
sdm.removeNodeInformationProvider(ENTITY_NODE + '#' + oldCapsVersion);
}
lastLocalCapsVersions.add(currentCapsVersion);
caps.put(currentCapsVersion, discoverInfo);
if (connection != null)
jidCaps.put(connection.getUser(), new NodeVerHash(ENTITY_NODE, currentCapsVersion, "sha-1"));
sdm.setNodeInformationProvider(ENTITY_NODE + '#' + currentCapsVersion, new NodeInformationProvider() {
List<String> features = sdm.getFeaturesList();
List<Identity> identities = new LinkedList<Identity>(ServiceDiscoveryManager.getIdentities());
List<PacketExtension> packetExtensions = sdm.getExtendedInfoAsList();
@Override
public List<Item> getNodeItems() {
return null;
}
@Override
public List<String> getNodeFeatures() {
return features;
}
@Override
public List<Identity> getNodeIdentities() {
return identities;
}
@Override
public List<PacketExtension> getNodePacketExtensions() {
return packetExtensions;
}
});
// Send an empty presence, and let the packet intercepter
// add a <c/> node to it.
// See http://xmpp.org/extensions/xep-0115.html#advertise
// We only send a presence packet if there was already one send
// to respect ConnectionConfiguration.isSendPresence()
if (connection != null && connection.isAuthenticated() && presenceSend) {
Presence presence = new Presence(Presence.Type.available);
connection.sendPacket(presence);
}
}
/**
* Verify DisoverInfo and Caps Node as defined in XEP-0115 5.4 Processing
* Method
*
* @see <a href="http://xmpp.org/extensions/xep-0115.html#ver-proc">XEP-0115
* 5.4 Processing Method</a>
*
* @param capsNode
* the caps node (i.e. node#ver)
* @param info
* @return true if it's valid and should be cache, false if not
*/
public static boolean verifyDiscvoerInfoVersion(String ver, String hash, DiscoverInfo info) {
// step 3.3 check for duplicate identities
if (info.containsDuplicateIdentities())
return false;
// step 3.4 check for duplicate features
if (info.containsDuplicateFeatures())
return false;
// step 3.5 check for well-formed packet extensions
if (verifyPacketExtensions(info))
return false;
String calculatedVer = generateVerificationString(info, hash);
if (!ver.equals(calculatedVer))
return false;
return true;
}
/**
*
* @param info
* @return true if the packet extensions is ill-formed
*/
protected static boolean verifyPacketExtensions(DiscoverInfo info) {
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.hasHiddenFromTypeField()) {
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;
}
}
}