/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.vysper.xmpp.modules.extension.xep0060_pubsub.handler;
import java.util.Collections;
import java.util.List;
import org.apache.vysper.compliance.SpecCompliant;
import org.apache.vysper.xmpp.addressing.Entity;
import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.NodeSubscriberVisitor;
import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.PubSubServiceConfiguration;
import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.SubscriptionItem;
import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.model.CollectionNode;
import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.model.LeafNode;
import org.apache.vysper.xmpp.protocol.NamespaceURIs;
import org.apache.vysper.xmpp.server.ServerRuntimeContext;
import org.apache.vysper.xmpp.server.SessionContext;
import org.apache.vysper.xmpp.stanza.IQStanza;
import org.apache.vysper.xmpp.stanza.IQStanzaType;
import org.apache.vysper.xmpp.stanza.Stanza;
import org.apache.vysper.xmpp.stanza.StanzaBuilder;
/**
* This class handles the "subscriptions" use cases for the "pubsub" namespace.
*
* @author The Apache MINA Project (http://mina.apache.org)
*/
@SpecCompliant(spec = "xep-0060", section = "5.6", status = SpecCompliant.ComplianceStatus.FINISHED, coverage = SpecCompliant.ComplianceCoverage.PARTIAL)
public class PubSubRetrieveSubscriptionsHandler extends AbstractPubSubGeneralHandler {
/**
* Creates a new handler for subscriptions requests of a user.
*
* @param serviceConfiguration
*/
public PubSubRetrieveSubscriptionsHandler(PubSubServiceConfiguration serviceConfiguration) {
super(serviceConfiguration);
}
/**
* @return "subscriptions" as worker element.
*/
@Override
protected String getWorkerElement() {
return "subscriptions";
}
/**
* This method takes care of handling the "subscriptions" use-case
*
* @return the appropriate response stanza
*/
@Override
protected Stanza handleGet(IQStanza stanza, ServerRuntimeContext serverRuntimeContext, SessionContext sessionContext) {
Entity serverJID = serviceConfiguration.getDomainJID();
CollectionNode root = serviceConfiguration.getRootNode();
Entity sender = extractSenderJID(stanza, sessionContext);
String iqStanzaID = stanza.getAttributeValue("id");
StanzaBuilder sb = StanzaBuilder.createDirectReply(stanza, false, IQStanzaType.RESULT);
sb.startInnerElement("pubsub", NamespaceURIs.XEP0060_PUBSUB);
String nodeName = extractNodeName(stanza);
List<SubscriptionItem> subscriptions = collectSubscriptions(root, sender, nodeName);
buildSuccessStanza(sb, nodeName, subscriptions);
sb.endInnerElement(); // pubsub
return new IQStanza(sb.build());
}
/**
* Traverses through all nodes or a single node to collect all subscriptions of the user.
* @return the list of subscriptions or an empty list.
*/
private List<SubscriptionItem> collectSubscriptions(CollectionNode root, Entity sender, String nodeName) {
List<SubscriptionItem> subscriptions;
if (nodeName == null) { // all subscriptions for all nodes
NodeSubscriberVisitor nodeSubscriptionVisitor = new NodeSubscriberVisitor(sender);
root.acceptNodes(nodeSubscriptionVisitor);
subscriptions = nodeSubscriptionVisitor.getSubscriptions();
} else { // only the subscriptions for the requested node
LeafNode node = root.find(nodeName);
if (node == null) {
// done - this is only a filter - no error conditions are defined
subscriptions = Collections.emptyList();
} else {
SubscriberSubscriptionVisitor subscriptionVisitor = new SubscriberSubscriptionVisitor(sender);
node.acceptSubscribers(subscriptionVisitor);
subscriptions = subscriptionVisitor.getSubscriptions();
}
}
return subscriptions;
}
/**
* This method adds the default "success" elements to the given StanzaBuilder.
*/
private void buildSuccessStanza(StanzaBuilder sb, String nodeName, List<SubscriptionItem> subscriptions) {
sb.startInnerElement("subscriptions", NamespaceURIs.XEP0060_PUBSUB);
for (SubscriptionItem s : subscriptions) {
sb.startInnerElement("subscription", NamespaceURIs.XEP0060_PUBSUB);
sb.addAttribute("node", s.getNodeName());
sb.addAttribute("jid", s.getSubscriberJID().getFullQualifiedName());
sb.addAttribute("subscription", s.getSubscriptionState());
sb.addAttribute("subid", s.getSubscriptionID());
sb.endInnerElement();
}
sb.endInnerElement();
}
}