ServiceDiscoveryManager.java
/**
*
* Copyright 2003-2007 Jive Software, 2018 Florian Schmaus.
*
* 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.disco;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
import org.jivesoftware.smack.ConnectionCreationListener;
import org.jivesoftware.smack.Manager;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPConnectionRegistry;
import org.jivesoftware.smack.XMPPException.XMPPErrorException;
import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Stanza;
import org.jivesoftware.smack.packet.StanzaError;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
import org.jivesoftware.smackx.disco.packet.DiscoverInfo.Identity;
import org.jivesoftware.smackx.disco.packet.DiscoverItems;
import org.jivesoftware.smackx.xdata.packet.DataForm;
import org.jxmpp.jid.DomainBareJid;
import org.jxmpp.jid.EntityBareJid;
import org.jxmpp.jid.Jid;
import org.jxmpp.util.cache.Cache;
import org.jxmpp.util.cache.ExpirationCache;
/**
* Manages discovery of services in XMPP entities. This class provides:
* <ol>
* <li>A registry of supported features in this XMPP entity.
* <li>Automatic response when this XMPP entity is queried for information.
* <li>Ability to discover items and information of remote XMPP entities.
* <li>Ability to publish publicly available items.
* </ol>
*
* @author Gaston Dombiak
* @author Florian Schmaus
*/
public final class ServiceDiscoveryManager extends Manager {
private static final String DEFAULT_IDENTITY_NAME = "Smack";
private static final String DEFAULT_IDENTITY_CATEGORY = "client";
private static final String DEFAULT_IDENTITY_TYPE = "pc";
private static final List<DiscoInfoLookupShortcutMechanism> discoInfoLookupShortcutMechanisms = new ArrayList<>(2);
private static DiscoverInfo.Identity defaultIdentity = new Identity(DEFAULT_IDENTITY_CATEGORY,
DEFAULT_IDENTITY_NAME, DEFAULT_IDENTITY_TYPE);
private final Set<DiscoverInfo.Identity> identities = new HashSet<>();
private DiscoverInfo.Identity identity = defaultIdentity;
private final Set<EntityCapabilitiesChangedListener> entityCapabilitiesChangedListeners = new CopyOnWriteArraySet<>();
private static final Map<XMPPConnection, ServiceDiscoveryManager> instances = new WeakHashMap<>();
private final Set<String> features = new HashSet<>();
private DataForm extendedInfo = null;
private final Map<String, NodeInformationProvider> nodeInformationProviders = new ConcurrentHashMap<>();
// Create a new ServiceDiscoveryManager on every established connection
static {
XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
@Override
public void connectionCreated(XMPPConnection connection) {
getInstanceFor(connection);
}
});
}
/**
* Set the default identity all new connections will have. If unchanged the default identity is an
* identity where category is set to 'client', type is set to 'pc' and name is set to 'Smack'.
*
* @param identity
*/
public static void setDefaultIdentity(DiscoverInfo.Identity identity) {
defaultIdentity = identity;
}
/**
* Creates a new ServiceDiscoveryManager for a given XMPPConnection. This means that the
* service manager will respond to any service discovery request that the connection may
* receive.
*
* @param connection the connection to which a ServiceDiscoveryManager is going to be created.
*/
private ServiceDiscoveryManager(XMPPConnection connection) {
super(connection);
addFeature(DiscoverInfo.NAMESPACE);
addFeature(DiscoverItems.NAMESPACE);
// Listen for disco#items requests and answer with an empty result
connection.registerIQRequestHandler(new AbstractIqRequestHandler(DiscoverItems.ELEMENT, DiscoverItems.NAMESPACE, IQ.Type.get, Mode.async) {
@Override
public IQ handleIQRequest(IQ iqRequest) {
DiscoverItems discoverItems = (DiscoverItems) iqRequest;
DiscoverItems response = new DiscoverItems();
response.setType(IQ.Type.result);
response.setTo(discoverItems.getFrom());
response.setStanzaId(discoverItems.getStanzaId());
response.setNode(discoverItems.getNode());
// Add the defined items related to the requested node. Look for
// the NodeInformationProvider associated with the requested node.
NodeInformationProvider nodeInformationProvider = getNodeInformationProvider(discoverItems.getNode());
if (nodeInformationProvider != null) {
// Specified node was found, add node items
response.addItems(nodeInformationProvider.getNodeItems());
// Add packet extensions
response.addExtensions(nodeInformationProvider.getNodePacketExtensions());
} else if (discoverItems.getNode() != null) {
// Return <item-not-found/> error since client doesn't contain
// the specified node
response.setType(IQ.Type.error);
response.setError(StanzaError.getBuilder(StanzaError.Condition.item_not_found));
}
return response;
}
});
// Listen for disco#info requests and answer the client's supported features
// To add a new feature as supported use the #addFeature message
connection.registerIQRequestHandler(new AbstractIqRequestHandler(DiscoverInfo.ELEMENT, DiscoverInfo.NAMESPACE, IQ.Type.get, Mode.async) {
@Override
public IQ handleIQRequest(IQ iqRequest) {
DiscoverInfo discoverInfo = (DiscoverInfo) iqRequest;
// Answer the client's supported features if the request is of the GET type
DiscoverInfo response = new DiscoverInfo();
response.setType(IQ.Type.result);
response.setTo(discoverInfo.getFrom());
response.setStanzaId(discoverInfo.getStanzaId());
response.setNode(discoverInfo.getNode());
// Add the client's identity and features only if "node" is null
// and if the request was not send to a node. If Entity Caps are
// enabled the client's identity and features are may also added
// if the right node is chosen
if (discoverInfo.getNode() == null) {
addDiscoverInfoTo(response);
} else {
// Disco#info was sent to a node. Check if we have information of the
// specified node
NodeInformationProvider nodeInformationProvider = getNodeInformationProvider(discoverInfo.getNode());
if (nodeInformationProvider != null) {
// Node was found. Add node features
response.addFeatures(nodeInformationProvider.getNodeFeatures());
// Add node identities
response.addIdentities(nodeInformationProvider.getNodeIdentities());
// Add packet extensions
response.addExtensions(nodeInformationProvider.getNodePacketExtensions());
} else {
// Return <item-not-found/> error since specified node was not found
response.setType(IQ.Type.error);
response.setError(StanzaError.getBuilder(StanzaError.Condition.item_not_found));
}
}
return response;
}
});
}
/**
* Returns the name of the client that will be returned when asked for the client identity
* in a disco request. The name could be any value you need to identity this client.
*
* @return the name of the client that will be returned when asked for the client identity
* in a disco request.
*/
public String getIdentityName() {
return identity.getName();
}
/**
* Sets the default identity the client will report.
*
* @param identity
*/
public synchronized void setIdentity(Identity identity) {
this.identity = Objects.requireNonNull(identity, "Identity can not be null");
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
}
/**
* Return the default identity of the client.
*
* @return the default identity.
*/
public Identity getIdentity() {
return identity;
}
/**
* Returns the type of client that will be returned when asked for the client identity in a
* disco request. The valid types are defined by the category client. Follow this link to learn
* the possible types: <a href="http://xmpp.org/registrar/disco-categories.html#client">Jabber::Registrar</a>.
*
* @return the type of client that will be returned when asked for the client identity in a
* disco request.
*/
public String getIdentityType() {
return identity.getType();
}
/**
* Add an further identity to the client.
*
* @param identity
*/
public synchronized void addIdentity(DiscoverInfo.Identity identity) {
identities.add(identity);
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
}
/**
* Remove an identity from the client. Note that the client needs at least one identity, the default identity, which
* can not be removed.
*
* @param identity
* @return true, if successful. Otherwise the default identity was given.
*/
public synchronized boolean removeIdentity(DiscoverInfo.Identity identity) {
if (identity.equals(this.identity)) return false;
identities.remove(identity);
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
return true;
}
/**
* Returns all identities of this client as unmodifiable Collection.
*
* @return all identies as set
*/
public Set<DiscoverInfo.Identity> getIdentities() {
Set<Identity> res = new HashSet<>(identities);
// Add the default identity that must exist
res.add(defaultIdentity);
return Collections.unmodifiableSet(res);
}
/**
* Returns the ServiceDiscoveryManager instance associated with a given XMPPConnection.
*
* @param connection the connection used to look for the proper ServiceDiscoveryManager.
* @return the ServiceDiscoveryManager associated with a given XMPPConnection.
*/
public static synchronized ServiceDiscoveryManager getInstanceFor(XMPPConnection connection) {
ServiceDiscoveryManager sdm = instances.get(connection);
if (sdm == null) {
sdm = new ServiceDiscoveryManager(connection);
// Register the new instance and associate it with the connection
instances.put(connection, sdm);
}
return sdm;
}
/**
* Add discover info response data.
*
* @see <a href="http://xmpp.org/extensions/xep-0030.html#info-basic">XEP-30 Basic Protocol; Example 2</a>
*
* @param response the discover info response packet
*/
public synchronized void addDiscoverInfoTo(DiscoverInfo response) {
// First add the identities of the connection
response.addIdentities(getIdentities());
// Add the registered features to the response
for (String feature : getFeatures()) {
response.addFeature(feature);
}
response.addExtension(extendedInfo);
}
/**
* Returns the NodeInformationProvider responsible for providing information
* (ie items) related to a given node or <tt>null</null> if none.<p>
*
* In MUC, a node could be 'http://jabber.org/protocol/muc#rooms' which means that the
* NodeInformationProvider will provide information about the rooms where the user has joined.
*
* @param node the node that contains items associated with an entity not addressable as a JID.
* @return the NodeInformationProvider responsible for providing information related
* to a given node.
*/
private NodeInformationProvider getNodeInformationProvider(String node) {
if (node == null) {
return null;
}
return nodeInformationProviders.get(node);
}
/**
* Sets the NodeInformationProvider responsible for providing information
* (ie items) related to a given node. Every time this client receives a disco request
* regarding the items of a given node, the provider associated to that node will be the
* responsible for providing the requested information.<p>
*
* In MUC, a node could be 'http://jabber.org/protocol/muc#rooms' which means that the
* NodeInformationProvider will provide information about the rooms where the user has joined.
*
* @param node the node whose items will be provided by the NodeInformationProvider.
* @param listener the NodeInformationProvider responsible for providing items related
* to the node.
*/
public void setNodeInformationProvider(String node, NodeInformationProvider listener) {
nodeInformationProviders.put(node, listener);
}
/**
* Removes the NodeInformationProvider responsible for providing information
* (ie items) related to a given node. This means that no more information will be
* available for the specified node.
*
* In MUC, a node could be 'http://jabber.org/protocol/muc#rooms' which means that the
* NodeInformationProvider will provide information about the rooms where the user has joined.
*
* @param node the node to remove the associated NodeInformationProvider.
*/
public void removeNodeInformationProvider(String node) {
nodeInformationProviders.remove(node);
}
/**
* Returns the supported features by this XMPP entity.
* <p>
* The result is a copied modifiable list of the original features.
* </p>
*
* @return a List of the supported features by this XMPP entity.
*/
public synchronized List<String> getFeatures() {
return new ArrayList<>(features);
}
/**
* Registers that a new feature is supported by this XMPP entity. When this client is
* queried for its information the registered features will be answered.<p>
*
* Since no stanza is actually sent to the server it is safe to perform this operation
* before logging to the server. In fact, you may want to configure the supported features
* before logging to the server so that the information is already available if it is required
* upon login.
*
* @param feature the feature to register as supported.
*/
public synchronized void addFeature(String feature) {
features.add(feature);
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
}
/**
* Removes the specified feature from the supported features by this XMPP entity.<p>
*
* Since no stanza is actually sent to the server it is safe to perform this operation
* before logging to the server.
*
* @param feature the feature to remove from the supported features.
*/
public synchronized void removeFeature(String feature) {
features.remove(feature);
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
}
/**
* Returns true if the specified feature is registered in the ServiceDiscoveryManager.
*
* @param feature the feature to look for.
* @return a boolean indicating if the specified featured is registered or not.
*/
public synchronized boolean includesFeature(String feature) {
return features.contains(feature);
}
/**
* Registers extended discovery information of this XMPP entity. When this
* client is queried for its information this data form will be returned as
* specified by XEP-0128.
* <p>
*
* Since no stanza is actually sent to the server it is safe to perform this
* operation before logging to the server. In fact, you may want to
* configure the extended info before logging to the server so that the
* information is already available if it is required upon login.
*
* @param info
* the data form that contains the extend service discovery
* information.
*/
public synchronized void setExtendedInfo(DataForm info) {
extendedInfo = info;
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
}
/**
* Returns the data form that is set as extended information for this Service Discovery instance (XEP-0128).
*
* @see <a href="http://xmpp.org/extensions/xep-0128.html">XEP-128: Service Discovery Extensions</a>
* @return the data form
*/
public DataForm getExtendedInfo() {
return extendedInfo;
}
/**
* Returns the data form as List of PacketExtensions, or null if no data form is set.
* This representation is needed by some classes (e.g. EntityCapsManager, NodeInformationProvider)
*
* @return the data form as List of PacketExtensions
*/
public List<ExtensionElement> getExtendedInfoAsList() {
List<ExtensionElement> res = null;
if (extendedInfo != null) {
res = new ArrayList<>(1);
res.add(extendedInfo);
}
return res;
}
/**
* Removes the data form containing extended service discovery information
* from the information returned by this XMPP entity.<p>
*
* Since no stanza is actually sent to the server it is safe to perform this
* operation before logging to the server.
*/
public synchronized void removeExtendedInfo() {
extendedInfo = null;
// Notify others of a state change of SDM. In order to keep the state consistent, this
// method is synchronized
renewEntityCapsVersion();
}
/**
* Returns the discovered information of a given XMPP entity addressed by its JID.
* Use null as entityID to query the server
*
* @param entityID the address of the XMPP entity or null.
* @return the discovered information.
* @throws XMPPErrorException
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
*/
public DiscoverInfo discoverInfo(Jid entityID) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
if (entityID == null)
return discoverInfo(null, null);
synchronized (discoInfoLookupShortcutMechanisms) {
for (DiscoInfoLookupShortcutMechanism discoInfoLookupShortcutMechanism : discoInfoLookupShortcutMechanisms) {
DiscoverInfo info = discoInfoLookupShortcutMechanism.getDiscoverInfoByUser(this, entityID);
if (info != null) {
// We were able to retrieve the information from Entity Caps and
// avoided a disco request, hurray!
return info;
}
}
}
// Last resort: Standard discovery.
return discoverInfo(entityID, null);
}
/**
* Returns the discovered information of a given XMPP entity addressed by its JID and
* note attribute. Use this message only when trying to query information which is not
* directly addressable.
*
* @see <a href="http://xmpp.org/extensions/xep-0030.html#info-basic">XEP-30 Basic Protocol</a>
* @see <a href="http://xmpp.org/extensions/xep-0030.html#info-nodes">XEP-30 Info Nodes</a>
*
* @param entityID the address of the XMPP entity.
* @param node the optional attribute that supplements the 'jid' attribute.
* @return the discovered information.
* @throws XMPPErrorException if the operation failed for some reason.
* @throws NoResponseException if there was no response from the server.
* @throws NotConnectedException
* @throws InterruptedException
*/
public DiscoverInfo discoverInfo(Jid entityID, String node) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
// Discover the entity's info
DiscoverInfo disco = new DiscoverInfo();
disco.setType(IQ.Type.get);
disco.setTo(entityID);
disco.setNode(node);
Stanza result = connection().createStanzaCollectorAndSend(disco).nextResultOrThrow();
return (DiscoverInfo) result;
}
/**
* Returns the discovered items of a given XMPP entity addressed by its JID.
*
* @param entityID the address of the XMPP entity.
* @return the discovered information.
* @throws XMPPErrorException if the operation failed for some reason.
* @throws NoResponseException if there was no response from the server.
* @throws NotConnectedException
* @throws InterruptedException
*/
public DiscoverItems discoverItems(Jid entityID) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
return discoverItems(entityID, null);
}
/**
* Returns the discovered items of a given XMPP entity addressed by its JID and
* note attribute. Use this message only when trying to query information which is not
* directly addressable.
*
* @param entityID the address of the XMPP entity.
* @param node the optional attribute that supplements the 'jid' attribute.
* @return the discovered items.
* @throws XMPPErrorException if the operation failed for some reason.
* @throws NoResponseException if there was no response from the server.
* @throws NotConnectedException
* @throws InterruptedException
*/
public DiscoverItems discoverItems(Jid entityID, String node) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
// Discover the entity's items
DiscoverItems disco = new DiscoverItems();
disco.setType(IQ.Type.get);
disco.setTo(entityID);
disco.setNode(node);
Stanza result = connection().createStanzaCollectorAndSend(disco).nextResultOrThrow();
return (DiscoverItems) result;
}
/**
* Returns true if the server supports publishing of items. A client may wish to publish items
* to the server so that the server can provide items associated to the client. These items will
* be returned by the server whenever the server receives a disco request targeted to the bare
* address of the client (i.e. user@host.com).
*
* @param entityID the address of the XMPP entity.
* @return true if the server supports publishing of items.
* @throws XMPPErrorException
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
* @deprecated The disco-publish feature was removed from XEP-0030 in 2008 in favor of XEP-0060: Publish-Subscribe.
*/
@Deprecated
// TODO: Remove in Smack 4.4
public boolean canPublishItems(Jid entityID) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
DiscoverInfo info = discoverInfo(entityID);
return canPublishItems(info);
}
/**
* Returns true if the server supports publishing of items. A client may wish to publish items
* to the server so that the server can provide items associated to the client. These items will
* be returned by the server whenever the server receives a disco request targeted to the bare
* address of the client (i.e. user@host.com).
*
* @param info the discover info stanza to check.
* @return true if the server supports publishing of items.
* @deprecated The disco-publish feature was removed from XEP-0030 in 2008 in favor of XEP-0060: Publish-Subscribe.
*/
@Deprecated
// TODO: Remove in Smack 4.4
public static boolean canPublishItems(DiscoverInfo info) {
return info.containsFeature("http://jabber.org/protocol/disco#publish");
}
/**
* Publishes new items to a parent entity. The item elements to publish MUST have at least
* a 'jid' attribute specifying the Entity ID of the item, and an action attribute which
* specifies the action being taken for that item. Possible action values are: "update" and
* "remove".
*
* @param entityID the address of the XMPP entity.
* @param discoverItems the DiscoveryItems to publish.
* @throws XMPPErrorException
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
* @deprecated The disco-publish feature was removed from XEP-0030 in 2008 in favor of XEP-0060: Publish-Subscribe.
*/
@Deprecated
// TODO: Remove in Smack 4.4
public void publishItems(Jid entityID, DiscoverItems discoverItems) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
publishItems(entityID, null, discoverItems);
}
/**
* Publishes new items to a parent entity and node. The item elements to publish MUST have at
* least a 'jid' attribute specifying the Entity ID of the item, and an action attribute which
* specifies the action being taken for that item. Possible action values are: "update" and
* "remove".
*
* @param entityID the address of the XMPP entity.
* @param node the attribute that supplements the 'jid' attribute.
* @param discoverItems the DiscoveryItems to publish.
* @throws XMPPErrorException if the operation failed for some reason.
* @throws NoResponseException if there was no response from the server.
* @throws NotConnectedException
* @throws InterruptedException
* @deprecated The disco-publish feature was removed from XEP-0030 in 2008 in favor of XEP-0060: Publish-Subscribe.
*/
@Deprecated
// TODO: Remove in Smack 4.4
public void publishItems(Jid entityID, String node, DiscoverItems discoverItems) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
discoverItems.setType(IQ.Type.set);
discoverItems.setTo(entityID);
discoverItems.setNode(node);
connection().createStanzaCollectorAndSend(discoverItems).nextResultOrThrow();
}
/**
* Returns true if the server supports the given feature.
*
* @param feature
* @return true if the server supports the given feature.
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
* @since 4.1
*/
public boolean serverSupportsFeature(CharSequence feature) throws NoResponseException, XMPPErrorException,
NotConnectedException, InterruptedException {
return serverSupportsFeatures(feature);
}
public boolean serverSupportsFeatures(CharSequence... features) throws NoResponseException,
XMPPErrorException, NotConnectedException, InterruptedException {
return serverSupportsFeatures(Arrays.asList(features));
}
public boolean serverSupportsFeatures(Collection<? extends CharSequence> features)
throws NoResponseException, XMPPErrorException, NotConnectedException,
InterruptedException {
return supportsFeatures(connection().getXMPPServiceDomain(), features);
}
/**
* Check if the given features are supported by the connection account. This means that the discovery information
* lookup will be performed on the bare JID of the connection managed by this ServiceDiscoveryManager.
*
* @param features the features to check
* @return <code>true</code> if all features are supported by the connection account, <code>false</code> otherwise
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
* @since 4.2.2
*/
public boolean accountSupportsFeatures(CharSequence... features)
throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
return accountSupportsFeatures(Arrays.asList(features));
}
/**
* Check if the given collection of features are supported by the connection account. This means that the discovery
* information lookup will be performed on the bare JID of the connection managed by this ServiceDiscoveryManager.
*
* @param features a collection of features
* @return <code>true</code> if all features are supported by the connection account, <code>false</code> otherwise
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
* @since 4.2.2
*/
public boolean accountSupportsFeatures(Collection<? extends CharSequence> features)
throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
EntityBareJid accountJid = connection().getUser().asEntityBareJid();
return supportsFeatures(accountJid, features);
}
/**
* Queries the remote entity for it's features and returns true if the given feature is found.
*
* @param jid the JID of the remote entity
* @param feature
* @return true if the entity supports the feature, false otherwise
* @throws XMPPErrorException
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
*/
public boolean supportsFeature(Jid jid, CharSequence feature) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
return supportsFeatures(jid, feature);
}
public boolean supportsFeatures(Jid jid, CharSequence... features) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
return supportsFeatures(jid, Arrays.asList(features));
}
public boolean supportsFeatures(Jid jid, Collection<? extends CharSequence> features) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
DiscoverInfo result = discoverInfo(jid);
for (CharSequence feature : features) {
if (!result.containsFeature(feature)) {
return false;
}
}
return true;
}
/**
* Create a cache to hold the 25 most recently lookup services for a given feature for a period
* of 24 hours.
*/
private final Cache<String, List<DiscoverInfo>> services = new ExpirationCache<>(25,
24 * 60 * 60 * 1000);
/**
* Find all services under the users service that provide a given feature.
*
* @param feature the feature to search for
* @param stopOnFirst if true, stop searching after the first service was found
* @param useCache if true, query a cache first to avoid network I/O
* @return a possible empty list of services providing the given feature
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
*/
public List<DiscoverInfo> findServicesDiscoverInfo(String feature, boolean stopOnFirst, boolean useCache)
throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
return findServicesDiscoverInfo(feature, stopOnFirst, useCache, null);
}
/**
* Find all services under the users service that provide a given feature.
*
* @param feature the feature to search for
* @param stopOnFirst if true, stop searching after the first service was found
* @param useCache if true, query a cache first to avoid network I/O
* @param encounteredExceptions an optional map which will be filled with the exceptions encountered
* @return a possible empty list of services providing the given feature
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
* @since 4.2.2
*/
public List<DiscoverInfo> findServicesDiscoverInfo(String feature, boolean stopOnFirst, boolean useCache, Map<? super Jid, Exception> encounteredExceptions)
throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
DomainBareJid serviceName = connection().getXMPPServiceDomain();
return findServicesDiscoverInfo(serviceName, feature, stopOnFirst, useCache, encounteredExceptions);
}
/**
* Find all services under a given service that provide a given feature.
*
* @param serviceName the service to query
* @param feature the feature to search for
* @param stopOnFirst if true, stop searching after the first service was found
* @param useCache if true, query a cache first to avoid network I/O
* @param encounteredExceptions an optional map which will be filled with the exceptions encountered
* @return a possible empty list of services providing the given feature
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
* @since 4.3.0
*/
public List<DiscoverInfo> findServicesDiscoverInfo(DomainBareJid serviceName, String feature, boolean stopOnFirst,
boolean useCache, Map<? super Jid, Exception> encounteredExceptions)
throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
List<DiscoverInfo> serviceDiscoInfo;
if (useCache) {
serviceDiscoInfo = services.lookup(feature);
if (serviceDiscoInfo != null) {
return serviceDiscoInfo;
}
}
serviceDiscoInfo = new LinkedList<>();
// Send the disco packet to the server itself
DiscoverInfo info;
try {
info = discoverInfo(serviceName);
} catch (XMPPErrorException e) {
if (encounteredExceptions != null) {
encounteredExceptions.put(serviceName, e);
}
return serviceDiscoInfo;
}
// Check if the server supports the feature
if (info.containsFeature(feature)) {
serviceDiscoInfo.add(info);
if (stopOnFirst) {
if (useCache) {
// Cache the discovered information
services.put(feature, serviceDiscoInfo);
}
return serviceDiscoInfo;
}
}
DiscoverItems items;
try {
// Get the disco items and send the disco packet to each server item
items = discoverItems(serviceName);
} catch (XMPPErrorException e) {
if (encounteredExceptions != null) {
encounteredExceptions.put(serviceName, e);
}
return serviceDiscoInfo;
}
for (DiscoverItems.Item item : items.getItems()) {
Jid address = item.getEntityID();
try {
// TODO is it OK here in all cases to query without the node attribute?
// MultipleRecipientManager queried initially also with the node attribute, but this
// could be simply a fault instead of intentional.
info = discoverInfo(address);
}
catch (XMPPErrorException | NoResponseException e) {
if (encounteredExceptions != null) {
encounteredExceptions.put(address, e);
}
continue;
}
if (info.containsFeature(feature)) {
serviceDiscoInfo.add(info);
if (stopOnFirst) {
break;
}
}
}
if (useCache) {
// Cache the discovered information
services.put(feature, serviceDiscoInfo);
}
return serviceDiscoInfo;
}
/**
* Find all services under the users service that provide a given feature.
*
* @param feature the feature to search for
* @param stopOnFirst if true, stop searching after the first service was found
* @param useCache if true, query a cache first to avoid network I/O
* @return a possible empty list of services providing the given feature
* @throws NoResponseException
* @throws XMPPErrorException
* @throws NotConnectedException
* @throws InterruptedException
*/
public List<DomainBareJid> findServices(String feature, boolean stopOnFirst, boolean useCache) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
List<DiscoverInfo> services = findServicesDiscoverInfo(feature, stopOnFirst, useCache);
List<DomainBareJid> res = new ArrayList<>(services.size());
for (DiscoverInfo info : services) {
res.add(info.getFrom().asDomainBareJid());
}
return res;
}
public DomainBareJid findService(String feature, boolean useCache, String category, String type)
throws NoResponseException, XMPPErrorException, NotConnectedException,
InterruptedException {
boolean noCategory = StringUtils.isNullOrEmpty(category);
boolean noType = StringUtils.isNullOrEmpty(type);
if (noType != noCategory) {
throw new IllegalArgumentException("Must specify either both, category and type, or none");
}
List<DiscoverInfo> services = findServicesDiscoverInfo(feature, false, useCache);
if (services.isEmpty()) {
return null;
}
if (!noCategory && !noType) {
for (DiscoverInfo info : services) {
if (info.hasIdentity(category, type)) {
return info.getFrom().asDomainBareJid();
}
}
}
return services.get(0).getFrom().asDomainBareJid();
}
public DomainBareJid findService(String feature, boolean useCache) throws NoResponseException,
XMPPErrorException, NotConnectedException, InterruptedException {
return findService(feature, useCache, null, null);
}
public boolean addEntityCapabilitiesChangedListener(EntityCapabilitiesChangedListener entityCapabilitiesChangedListener) {
return entityCapabilitiesChangedListeners.add(entityCapabilitiesChangedListener);
}
/**
* Notify the {@link EntityCapabilitiesChangedListener} about changed capabilities.
*/
private void renewEntityCapsVersion() {
for (EntityCapabilitiesChangedListener entityCapabilitiesChangedListener : entityCapabilitiesChangedListeners) {
entityCapabilitiesChangedListener.onEntityCapailitiesChanged();
}
}
public static void addDiscoInfoLookupShortcutMechanism(DiscoInfoLookupShortcutMechanism discoInfoLookupShortcutMechanism) {
synchronized (discoInfoLookupShortcutMechanisms) {
discoInfoLookupShortcutMechanisms.add(discoInfoLookupShortcutMechanism);
Collections.sort(discoInfoLookupShortcutMechanisms);
}
}
public static void removeDiscoInfoLookupShortcutMechanism(DiscoInfoLookupShortcutMechanism discoInfoLookupShortcutMechanism) {
synchronized (discoInfoLookupShortcutMechanisms) {
discoInfoLookupShortcutMechanisms.remove(discoInfoLookupShortcutMechanism);
}
}
}