/**
* Computes and returns the hash of the specified <tt>capsString</tt> using the specified
* <tt>hashAlgorithm</tt>.
*
* @param hashAlgorithm the name of the algorithm to be used to generate the hash
* @param capsString the capabilities string that we'd like to compute a hash for.
* @return the hash of <tt>capsString</tt> computed by the specified <tt>hashAlgorithm</tt> or
* <tt>null</tt> if generating the hash has failed
*/
private static String capsToHash(String hashAlgorithm, String capsString) {
try {
MessageDigest md = MessageDigest.getInstance(hashAlgorithm);
byte[] digest = md.digest(capsString.getBytes());
return Base64.encodeBytes(digest);
} catch (NoSuchAlgorithmException nsae) {
logger.error("Unsupported XEP-0115: Entity Capabilities hash algorithm: " + hashAlgorithm);
return null;
}
}
/**
* Keeps track of entity capabilities.
*
* <p>This work is based on Jonas Adahl's smack fork.
*
* @author Emil Ivov
* @author Lyubomir Marinov
*/
public class EntityCapsManager {
/**
* The <tt>Logger</tt> used by the <tt>EntityCapsManager</tt> class and its instances for logging
* output.
*/
private static final Logger logger = Logger.getLogger(EntityCapsManager.class);
/** Static OSGi bundle context used by this class. */
private static BundleContext bundleContext;
/** Configuration service instance used by this class. */
private static ConfigurationService configService;
/**
* The prefix of the <tt>ConfigurationService</tt> properties which persist {@link
* #caps2discoverInfo}.
*/
private static final String CAPS_PROPERTY_NAME_PREFIX =
"net.java.sip.communicator.impl.protocol.jabber.extensions.caps." + "EntityCapsManager.CAPS.";
/**
* An empty array of <tt>UserCapsNodeListener</tt> elements explicitly defined in order to reduce
* unnecessary allocations.
*/
private static final UserCapsNodeListener[] NO_USER_CAPS_NODE_LISTENERS =
new UserCapsNodeListener[0];
/** The node value to advertise. */
private static String entityNode =
OSUtils.IS_ANDROID ? "http://android.jitsi.org" : "http://jitsi.org";
/**
* The <tt>Map</tt> of <tt>Caps</tt> to <tt>DiscoverInfo</tt> which associates a node#ver with the
* entity capabilities so that they don't have to be retrieved every time their necessary. Because
* ver is constructed from the entity capabilities using a specific hash method, the hash method
* is also associated with the entity capabilities along with the node and the ver in order to
* disambiguate cases of equal ver values for different entity capabilities constructed using
* different hash methods.
*/
private static final Map<Caps, DiscoverInfo> caps2discoverInfo =
new ConcurrentHashMap<Caps, DiscoverInfo>();
/**
* 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)
*/
private final Map<String, Caps> userCaps = new ConcurrentHashMap<String, Caps>();
/** CapsVerListeners gets notified when the version string is changed. */
private final Set<CapsVerListener> capsVerListeners = new CopyOnWriteArraySet<CapsVerListener>();
/** The current hash of our version and supported features. */
private String currentCapsVersion = null;
/**
* The list of <tt>UserCapsNodeListener</tt>s interested in events notifying about changes in the
* list of user caps nodes of this <tt>EntityCapsManager</tt>.
*/
private final List<UserCapsNodeListener> userCapsNodeListeners =
new LinkedList<UserCapsNodeListener>();
static {
ProviderManager.getInstance()
.addExtensionProvider(
CapsPacketExtension.ELEMENT_NAME, CapsPacketExtension.NAMESPACE, new CapsProvider());
}
/**
* Add {@link DiscoverInfo} to our caps database.
*
* <p><b>Warning</b>: The specified <tt>DiscoverInfo</tt> is trusted to be valid with respect to
* the specified <tt>Caps</tt> for performance reasons because the <tt>DiscoverInfo</tt> should
* have already been validated in order to be used elsewhere anyway.
*
* @param caps the <tt>Caps<tt/> i.e. the node, the hash and the ver for which a
* <tt>DiscoverInfo</tt> is to be added to our caps database.
* @param info {@link DiscoverInfo} for the specified <tt>Caps</tt>.
*/
public static void addDiscoverInfoByCaps(Caps caps, DiscoverInfo info) {
cleanupDiscoverInfo(info);
/*
* DiscoverInfo carries the node we're now associating it with a
* specific node so we'd better keep them in sync.
*/
info.setNode(caps.getNodeVer());
synchronized (caps2discoverInfo) {
DiscoverInfo oldInfo = caps2discoverInfo.put(caps, info);
/*
* If the specified info is a new association for the specified
* node, remember it across application instances in order to not
* query for it over the network.
*/
if ((oldInfo == null) || !oldInfo.equals(info)) {
String xml = info.getChildElementXML();
if ((xml != null) && (xml.length() != 0)) {
getConfigService().setProperty(getCapsPropertyName(caps), xml);
}
}
}
}
/**
* Gets the name of the property in the <tt>ConfigurationService</tt> which is or is to be
* associated with a specific <tt>Caps</tt> value.
*
* @param caps the <tt>Caps</tt> value for which the associated <tt>ConfigurationService</tt>
* property name is to be returned
* @return the name of the property in the <tt>ConfigurationService</tt> which is or is to be
* associated with a specific <tt>Caps</tt> value
*/
private static String getCapsPropertyName(Caps caps) {
return CAPS_PROPERTY_NAME_PREFIX + caps.node + '#' + caps.hash + '#' + caps.ver;
}
/** Returns cached instance of {@link ConfigurationService}. */
private static ConfigurationService getConfigService() {
if (configService == null) {
configService = ServiceUtils.getService(bundleContext, ConfigurationService.class);
}
return configService;
}
/**
* Sets OSGi bundle context instance that will be used by this class.
*
* @param bundleContext the <tt>BundleContext</tt> instance to be used by this class or
* <tt>null</tt> to clear the reference.
*/
public static void setBundleContext(BundleContext bundleContext) {
if (bundleContext == null) {
configService = null;
}
EntityCapsManager.bundleContext = bundleContext;
}
/**
* Add a record telling what entity caps node a user has.
*
* @param user the user (Full JID)
* @param node the node (of the caps packet extension)
* @param hash the hashing algorithm used to calculate <tt>ver</tt>
* @param ver the version (of the caps packet extension)
* @param ext the ext (of the caps packet extension)
* @param online indicates if the user is online
*/
private void addUserCapsNode(
String user, String node, String hash, String ver, String ext, boolean online) {
if ((user != null) && (node != null) && (hash != null) && (ver != null)) {
Caps caps = userCaps.get(user);
if ((caps == null)
|| !caps.node.equals(node)
|| !caps.hash.equals(hash)
|| !caps.ver.equals(ver)) {
caps = new Caps(node, hash, ver, ext);
userCaps.put(user, caps);
} else return;
// Fire userCapsNodeAdded.
UserCapsNodeListener[] listeners;
synchronized (userCapsNodeListeners) {
listeners = userCapsNodeListeners.toArray(NO_USER_CAPS_NODE_LISTENERS);
}
if (listeners.length != 0) {
String nodeVer = caps.getNodeVer();
for (UserCapsNodeListener listener : listeners)
listener.userCapsNodeAdded(user, nodeVer, online);
}
}
}
/**
* Adds a specific <tt>UserCapsNodeListener</tt> to the list of <tt>UserCapsNodeListener</tt>s
* interested in events notifying about changes in the list of user caps nodes of this
* <tt>EntityCapsManager</tt>.
*
* @param listener the <tt>UserCapsNodeListener</tt> which is interested in events notifying about
* changes in the list of user caps nodes of this <tt>EntityCapsManager</tt>
*/
public void addUserCapsNodeListener(UserCapsNodeListener listener) {
if (listener == null) throw new NullPointerException("listener");
synchronized (userCapsNodeListeners) {
if (!userCapsNodeListeners.contains(listener)) userCapsNodeListeners.add(listener);
}
}
/**
* Remove records telling what entity caps node a contact has.
*
* @param contact the contact
*/
public void removeContactCapsNode(Contact contact) {
Caps caps = null;
String lastRemovedJid = null;
Iterator<String> iter = userCaps.keySet().iterator();
while (iter.hasNext()) {
String jid = iter.next();
if (StringUtils.parseBareAddress(jid).equals(contact.getAddress())) {
caps = userCaps.get(jid);
lastRemovedJid = jid;
iter.remove();
}
}
// fire only for the last one, at the end the event out
// of the protocol will be one and for the contact
if (caps != null) {
UserCapsNodeListener[] listeners;
synchronized (userCapsNodeListeners) {
listeners = userCapsNodeListeners.toArray(NO_USER_CAPS_NODE_LISTENERS);
}
if (listeners.length != 0) {
String nodeVer = caps.getNodeVer();
for (UserCapsNodeListener listener : listeners)
listener.userCapsNodeRemoved(lastRemovedJid, nodeVer, false);
}
}
}
/**
* Remove a record telling what entity caps node a user has.
*
* @param user the user (Full JID)
*/
public void removeUserCapsNode(String user) {
Caps caps = userCaps.remove(user);
// Fire userCapsNodeRemoved.
if (caps != null) {
UserCapsNodeListener[] listeners;
synchronized (userCapsNodeListeners) {
listeners = userCapsNodeListeners.toArray(NO_USER_CAPS_NODE_LISTENERS);
}
if (listeners.length != 0) {
String nodeVer = caps.getNodeVer();
for (UserCapsNodeListener listener : listeners)
listener.userCapsNodeRemoved(user, nodeVer, false);
}
}
}
/**
* Removes a specific <tt>UserCapsNodeListener</tt> from the list of
* <tt>UserCapsNodeListener</tt>s interested in events notifying about changes in the list of user
* caps nodes of this <tt>EntityCapsManager</tt>.
*
* @param listener the <tt>UserCapsNodeListener</tt> which is no longer interested in events
* notifying about changes in the list of user caps nodes of this <tt>EntityCapsManager</tt>
*/
public void removeUserCapsNodeListener(UserCapsNodeListener listener) {
if (listener != null) {
synchronized (userCapsNodeListeners) {
userCapsNodeListeners.remove(listener);
}
}
}
/**
* Gets the <tt>Caps</tt> i.e. the node, the hash and the ver of a user.
*
* @param user the user (Full JID)
* @return the <tt>Caps</tt> i.e. the node, the hash and the ver of <tt>user</tt>
*/
public Caps getCapsByUser(String user) {
return userCaps.get(user);
}
/**
* 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 DiscoverInfo getDiscoverInfoByUser(String user) {
Caps caps = userCaps.get(user);
return (caps == null) ? null : getDiscoverInfoByCaps(caps);
}
/**
* Get our own caps version.
*
* @return our own caps version
*/
public String getCapsVersion() {
return currentCapsVersion;
}
/**
* Get our own entity node.
*
* @return our own entity node.
*/
public String getNode() {
return entityNode;
}
/**
* Set our own entity node.
*
* @param node the new node
*/
public void setNode(String node) {
entityNode = node;
}
/**
* Retrieve DiscoverInfo for a specific node.
*
* @param caps the <tt>Caps</tt> i.e. the node, the hash and the ver
* @return The corresponding DiscoverInfo or null if none is known.
*/
public static DiscoverInfo getDiscoverInfoByCaps(Caps caps) {
synchronized (caps2discoverInfo) {
DiscoverInfo discoverInfo = caps2discoverInfo.get(caps);
/*
* If we don't have the discoverInfo in the runtime cache yet, we
* may have it remembered in a previous application instance.
*/
if (discoverInfo == null) {
ConfigurationService configurationService = getConfigService();
String capsPropertyName = getCapsPropertyName(caps);
String xml = configurationService.getString(capsPropertyName);
if ((xml != null) && (xml.length() != 0)) {
IQProvider discoverInfoProvider =
(IQProvider)
ProviderManager.getInstance()
.getIQProvider("query", "http://jabber.org/protocol/disco#info");
if (discoverInfoProvider != null) {
XmlPullParser parser = new MXParser();
try {
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
parser.setInput(new StringReader(xml));
// Start the parser.
parser.next();
} catch (XmlPullParserException xppex) {
parser = null;
} catch (IOException ioex) {
parser = null;
}
if (parser != null) {
try {
discoverInfo = (DiscoverInfo) discoverInfoProvider.parseIQ(parser);
} catch (Exception ex) {
}
if (discoverInfo != null) {
if (caps.isValid(discoverInfo)) caps2discoverInfo.put(caps, discoverInfo);
else {
logger.error(
"Invalid DiscoverInfo for " + caps.getNodeVer() + ": " + discoverInfo);
/*
* The discoverInfo doesn't seem valid
* according to the caps which means that we
* must have stored invalid information.
* Delete the invalid information in order
* to not try to validate it again.
*/
configurationService.removeProperty(capsPropertyName);
}
}
}
}
}
}
return discoverInfo;
}
}
/**
* Removes from, to and packet-id from <tt>info</tt>.
*
* @param info the {@link DiscoverInfo} that we'd like to cleanup.
*/
private static void cleanupDiscoverInfo(DiscoverInfo info) {
info.setFrom(null);
info.setTo(null);
info.setPacketID(null);
}
/**
* Gets the features of a specific <tt>DiscoverInfo</tt> in the form of a read-only
* <tt>Feature</tt> <tt>Iterator<tt/> by calling the internal method {@link
* DiscoverInfo#getFeatures()}.
*
* @param discoverInfo the <tt>DiscoverInfo</tt> the features of which are to be retrieved
* @return a read-only <tt>Feature</tt> <tt>Iterator</tt> which lists the features of the
* specified <tt>discoverInfo</tt>
*/
@SuppressWarnings("unchecked")
private static Iterator<DiscoverInfo.Feature> getDiscoverInfoFeatures(DiscoverInfo discoverInfo) {
Method getFeaturesMethod;
try {
getFeaturesMethod = DiscoverInfo.class.getDeclaredMethod("getFeatures");
} catch (NoSuchMethodException nsmex) {
throw new UndeclaredThrowableException(nsmex);
}
getFeaturesMethod.setAccessible(true);
try {
return (Iterator<DiscoverInfo.Feature>) getFeaturesMethod.invoke(discoverInfo);
} catch (IllegalAccessException iaex) {
throw new UndeclaredThrowableException(iaex);
} catch (InvocationTargetException itex) {
throw new UndeclaredThrowableException(itex);
}
}
/**
* Registers this Manager's listener with <tt>connection</tt>.
*
* @param connection the connection that we'd like this manager to register with.
*/
public void addPacketListener(XMPPConnection connection) {
PacketFilter filter =
new AndFilter(
new PacketTypeFilter(Presence.class),
new PacketExtensionFilter(
CapsPacketExtension.ELEMENT_NAME, CapsPacketExtension.NAMESPACE));
connection.addPacketListener(new CapsPacketListener(), filter);
}
/**
* Adds <tt>listener</tt> to the list of {@link CapsVerListener}s that we notify when new features
* occur and the version hash needs to be regenerated. The method would also notify
* <tt>listener</tt> if our current caps version has been generated and is different than
* <tt>null</tt>.
*
* @param listener the {@link CapsVerListener} we'd like to register.
*/
public void addCapsVerListener(CapsVerListener listener) {
synchronized (capsVerListeners) {
if (capsVerListeners.contains(listener)) return;
capsVerListeners.add(listener);
if (currentCapsVersion != null) listener.capsVerUpdated(currentCapsVersion);
}
}
/**
* Removes <tt>listener</tt> from the list of currently registered {@link CapsVerListener}s.
*
* @param listener the {@link CapsVerListener} we'd like to unregister.
*/
public void removeCapsVerListener(CapsVerListener listener) {
synchronized (capsVerListeners) {
capsVerListeners.remove(listener);
}
}
/**
* Notifies all currently registered {@link CapsVerListener}s that the version hash has changed.
*/
private void fireCapsVerChanged() {
List<CapsVerListener> listenersCopy = null;
synchronized (capsVerListeners) {
listenersCopy = new ArrayList<CapsVerListener>(capsVerListeners);
}
for (CapsVerListener listener : listenersCopy) listener.capsVerUpdated(currentCapsVersion);
}
/**
* Computes and returns the hash of the specified <tt>capsString</tt> using the specified
* <tt>hashAlgorithm</tt>.
*
* @param hashAlgorithm the name of the algorithm to be used to generate the hash
* @param capsString the capabilities string that we'd like to compute a hash for.
* @return the hash of <tt>capsString</tt> computed by the specified <tt>hashAlgorithm</tt> or
* <tt>null</tt> if generating the hash has failed
*/
private static String capsToHash(String hashAlgorithm, String capsString) {
try {
MessageDigest md = MessageDigest.getInstance(hashAlgorithm);
byte[] digest = md.digest(capsString.getBytes());
return Base64.encodeBytes(digest);
} catch (NoSuchAlgorithmException nsae) {
logger.error("Unsupported XEP-0115: Entity Capabilities hash algorithm: " + hashAlgorithm);
return null;
}
}
/**
* Converts the form field values in the <tt>ffValuesIter</tt> into a caps string.
*
* @param ffValuesIter the {@link Iterator} containing the form field values.
* @param capsBldr a <tt>StringBuilder</tt> to which the caps string representing the form field
* values is to be appended
*/
private static void formFieldValuesToCaps(Iterator<String> ffValuesIter, StringBuilder capsBldr) {
SortedSet<String> fvs = new TreeSet<String>();
while (ffValuesIter.hasNext()) fvs.add(ffValuesIter.next());
for (String fv : fvs) capsBldr.append(fv).append('<');
}
/**
* Calculates the <tt>String</tt> for a specific <tt>DiscoverInfo</tt> which is to be hashed in
* order to compute the ver string for that <tt>DiscoverInfo</tt>.
*
* @param discoverInfo the <tt>DiscoverInfo</tt> for which the <tt>String</tt> to be hashed in
* order to compute its ver string is to be calculated
* @return the <tt>String</tt> for <tt>discoverInfo</tt> which is to be hashed in order to compute
* its ver string
*/
private static String calculateEntityCapsString(DiscoverInfo discoverInfo) {
StringBuilder bldr = new StringBuilder();
// Add identities
{
Iterator<DiscoverInfo.Identity> identities = discoverInfo.getIdentities();
SortedSet<DiscoverInfo.Identity> is =
new TreeSet<DiscoverInfo.Identity>(
new Comparator<DiscoverInfo.Identity>() {
public int compare(DiscoverInfo.Identity i1, DiscoverInfo.Identity i2) {
int category = i1.getCategory().compareTo(i2.getCategory());
if (category != 0) return category;
int type = i1.getType().compareTo(i2.getType());
if (type != 0) return type;
/*
* TODO Sort by xml:lang.
*
* Since sort by xml:lang is currently missing,
* use the last supported sort criterion i.e.
* type.
*/
return type;
}
});
if (identities != null) while (identities.hasNext()) is.add(identities.next());
for (DiscoverInfo.Identity i : is) {
bldr.append(i.getCategory())
.append('/')
.append(i.getType())
.append("//")
.append(i.getName())
.append('<');
}
}
// Add features
{
Iterator<DiscoverInfo.Feature> features = getDiscoverInfoFeatures(discoverInfo);
SortedSet<String> fs = new TreeSet<String>();
if (features != null) while (features.hasNext()) fs.add(features.next().getVar());
for (String f : fs) bldr.append(f).append('<');
}
DataForm extendedInfo = (DataForm) discoverInfo.getExtension("x", "jabber:x:data");
if (extendedInfo != null) {
synchronized (extendedInfo) {
SortedSet<FormField> fs =
new TreeSet<FormField>(
new Comparator<FormField>() {
public int compare(FormField f1, FormField f2) {
return f1.getVariable().compareTo(f2.getVariable());
}
});
FormField formType = null;
for (Iterator<FormField> fieldsIter = extendedInfo.getFields(); fieldsIter.hasNext(); ) {
FormField f = fieldsIter.next();
if (!f.getVariable().equals("FORM_TYPE")) fs.add(f);
else formType = f;
}
// Add FORM_TYPE values
if (formType != null) formFieldValuesToCaps(formType.getValues(), bldr);
// Add the other values
for (FormField f : fs) {
bldr.append(f.getVariable()).append('<');
formFieldValuesToCaps(f.getValues(), bldr);
}
}
}
return bldr.toString();
}
/**
* Calculates the ver string for the specified <tt>discoverInfo</tt>, identity type, name
* features, and extendedInfo.
*
* @param discoverInfo the {@link DiscoverInfo} we'd be creating a ver <tt>String</tt> for
*/
public void calculateEntityCapsVersion(DiscoverInfo discoverInfo) {
setCurrentCapsVersion(
discoverInfo,
capsToHash(CapsPacketExtension.HASH_METHOD, calculateEntityCapsString(discoverInfo)));
}
/**
* Set our own caps version.
*
* @param discoverInfo the {@link DiscoverInfo} that we'd like to map to the <tt>capsVersion</tt>.
* @param capsVersion the new caps version
*/
public void setCurrentCapsVersion(DiscoverInfo discoverInfo, String capsVersion) {
Caps caps = new Caps(getNode(), CapsPacketExtension.HASH_METHOD, capsVersion, null);
/*
* DiscoverInfo carries the node and the ver and we're now setting a new
* ver so we should update the DiscoveryInfo.
*/
discoverInfo.setNode(caps.getNodeVer());
if (!caps.isValid(discoverInfo)) {
throw new IllegalArgumentException(
"The specified discoverInfo must be valid with respect"
+ " to the specified capsVersion");
}
currentCapsVersion = capsVersion;
addDiscoverInfoByCaps(caps, discoverInfo);
fireCapsVerChanged();
}
/** The {@link PacketListener} that will be registering incoming caps. */
private class CapsPacketListener implements PacketListener {
/**
* Handles incoming presence packets and maps jids to node#ver strings.
*
* @param packet the incoming presence <tt>Packet</tt> to be handled
* @see PacketListener#processPacket(Packet)
*/
public void processPacket(Packet packet) {
CapsPacketExtension ext =
(CapsPacketExtension)
packet.getExtension(CapsPacketExtension.ELEMENT_NAME, CapsPacketExtension.NAMESPACE);
/*
* Before Version 1.4 of XEP-0115: Entity Capabilities, the 'ver'
* attribute was generated differently and the 'hash' attribute was
* absent. The 'ver' attribute in Version 1.3 represents the
* specific version of the client and thus does not provide a way to
* validate the DiscoverInfo sent by the client. If
* EntityCapsManager receives no 'hash' attribute, it will assume
* the legacy format and will not cache it because the DiscoverInfo
* to be received from the client later on will not be trustworthy.
*/
String hash = ext.getHash();
/* Google Talk web does not set hash but we need it to be cached */
if (hash == null) hash = "";
if (hash != null) {
// Check it the packet indicates that the user is online. We
// will use this information to decide if we're going to send
// the discover info request.
boolean online = (packet instanceof Presence) && ((Presence) packet).isAvailable();
if (online) {
addUserCapsNode(
packet.getFrom(), ext.getNode(), hash, ext.getVersion(), ext.getExtensions(), online);
} else {
removeUserCapsNode(packet.getFrom());
}
}
}
}
/**
* Implements an immutable value which stands for a specific node, a specific hash (algorithm) and
* a specific ver.
*
* @author Lyubomir Marinov
*/
public static class Caps {
/** The hash (algorithm) of this <tt>Caps</tt> value. */
public final String hash;
/** The node of this <tt>Caps</tt> value. */
public final String node;
/** The ext info of this <tt>Caps</tt> value. */
public String ext;
/**
* The String which is the concatenation of {@link #node} and the {@link #ver} separated by the
* character '#'. Cached for the sake of efficiency.
*/
private final String nodeVer;
/** The ver of this <tt>Caps</tt> value. */
public final String ver;
/**
* Initializes a new <tt>Caps</tt> instance which is to represent a specific node, a specific
* hash (algorithm) and a specific ver.
*
* @param node the node to be represented by the new instance
* @param hash the hash (algorithm) to be represented by the new instance
* @param ver the ver to be represented by the new instance
* @param ext the ext to be represented by the new instance
*/
public Caps(String node, String hash, String ver, String ext) {
if (node == null) throw new NullPointerException("node");
if (hash == null) throw new NullPointerException("hash");
if (ver == null) throw new NullPointerException("ver");
this.node = node;
this.hash = hash;
this.ver = ver;
this.ext = ext;
this.nodeVer = this.node + '#' + this.ver;
}
/**
* Gets a <tt>String</tt> which represents the concatenation of the <tt>node</tt> property of
* this instance, the character '#' and the <tt>ver</tt> property of this instance.
*
* @return a <tt>String</tt> which represents the concatenation of the <tt>node</tt> property of
* this instance, the character '#' and the <tt>ver</tt> property of this instance
*/
public final String getNodeVer() {
return nodeVer;
}
/**
* Determines whether a specific <tt>DiscoverInfo</tt> is valid according to this <tt>Caps</tt>
* i.e. whether the <tt>discoverInfo</tt> has the node and the ver of this <tt>Caps</tt> and the
* ver calculated from the <tt>discoverInfo</tt> using the hash (algorithm) of this
* <tt>Caps</tt> is equal to the ver of this <tt>Caps</tt>.
*
* @param discoverInfo the <tt>DiscoverInfo</tt> to be validated by this <tt>Caps</tt>
* @return <tt>true</tt> if the specified <tt>DiscoverInfo</tt> has the node and the ver of this
* <tt>Caps</tt> and the ver calculated from the <tt>discoverInfo</tt> using the hash
* (algorithm) of this <tt>Caps</tt> is equal to the ver of this <tt>Caps</tt>; otherwise,
* <tt>false</tt>
*/
public boolean isValid(DiscoverInfo discoverInfo) {
if (discoverInfo != null) {
// The "node" attribute is not necessary in the query element.
// For example, Swift does not send back the "node" attribute in
// the Disco#info response. Thus, if the node of the IQ response
// is null, then we set it to the request one.
if (discoverInfo.getNode() == null) {
discoverInfo.setNode(getNodeVer());
}
if (getNodeVer().equals(discoverInfo.getNode())
&& !hash.equals("")
&& ver.equals(capsToHash(hash, calculateEntityCapsString(discoverInfo)))) {
return true;
}
}
return false;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Caps caps = (Caps) o;
if (!hash.equals(caps.hash)) return false;
if (!node.equals(caps.node)) return false;
if (!ver.equals(caps.ver)) return false;
return true;
}
@Override
public int hashCode() {
int result = hash.hashCode();
result = 31 * result + node.hashCode();
result = 31 * result + ver.hashCode();
return result;
}
}
}
/**
* Retrieve DiscoverInfo for a specific node.
*
* @param caps the <tt>Caps</tt> i.e. the node, the hash and the ver
* @return The corresponding DiscoverInfo or null if none is known.
*/
public static DiscoverInfo getDiscoverInfoByCaps(Caps caps) {
synchronized (caps2discoverInfo) {
DiscoverInfo discoverInfo = caps2discoverInfo.get(caps);
/*
* If we don't have the discoverInfo in the runtime cache yet, we
* may have it remembered in a previous application instance.
*/
if (discoverInfo == null) {
ConfigurationService configurationService = getConfigService();
String capsPropertyName = getCapsPropertyName(caps);
String xml = configurationService.getString(capsPropertyName);
if ((xml != null) && (xml.length() != 0)) {
IQProvider discoverInfoProvider =
(IQProvider)
ProviderManager.getInstance()
.getIQProvider("query", "http://jabber.org/protocol/disco#info");
if (discoverInfoProvider != null) {
XmlPullParser parser = new MXParser();
try {
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
parser.setInput(new StringReader(xml));
// Start the parser.
parser.next();
} catch (XmlPullParserException xppex) {
parser = null;
} catch (IOException ioex) {
parser = null;
}
if (parser != null) {
try {
discoverInfo = (DiscoverInfo) discoverInfoProvider.parseIQ(parser);
} catch (Exception ex) {
}
if (discoverInfo != null) {
if (caps.isValid(discoverInfo)) caps2discoverInfo.put(caps, discoverInfo);
else {
logger.error(
"Invalid DiscoverInfo for " + caps.getNodeVer() + ": " + discoverInfo);
/*
* The discoverInfo doesn't seem valid
* according to the caps which means that we
* must have stored invalid information.
* Delete the invalid information in order
* to not try to validate it again.
*/
configurationService.removeProperty(capsPropertyName);
}
}
}
}
}
}
return discoverInfo;
}
}
