IQDiscoItemsHandler.java 23.5 KB
Newer Older
1 2 3 4 5
/**
 * $RCSfile$
 * $Revision: 1701 $
 * $Date: 2005-07-26 02:23:45 -0300 (Tue, 26 Jul 2005) $
 *
6
 * Copyright (C) 2005-2008 Jive Software. All rights reserved.
7 8
 *
 * This software is published under the terms of the GNU Public License (GPL),
9 10
 * a copy of which is included in this distribution, or a commercial license
 * agreement with Jive.
11 12
 */

13
package org.jivesoftware.openfire.disco;
14 15 16 17

import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.QName;
18
import org.dom4j.tree.DefaultElement;
19 20 21
import org.jivesoftware.openfire.IQHandlerInfo;
import org.jivesoftware.openfire.SessionManager;
import org.jivesoftware.openfire.XMPPServer;
22 23 24
import org.jivesoftware.openfire.cluster.ClusterEventListener;
import org.jivesoftware.openfire.cluster.ClusterManager;
import org.jivesoftware.openfire.cluster.NodeID;
25
import org.jivesoftware.openfire.handler.IQHandler;
26 27
import org.jivesoftware.openfire.resultsetmanager.ResultSet;
import org.jivesoftware.openfire.resultsetmanager.ResultSetImpl;
28 29 30 31 32
import org.jivesoftware.openfire.roster.RosterItem;
import org.jivesoftware.openfire.session.Session;
import org.jivesoftware.openfire.user.User;
import org.jivesoftware.openfire.user.UserManager;
import org.jivesoftware.openfire.user.UserNotFoundException;
33 34 35
import org.jivesoftware.util.cache.Cache;
import org.jivesoftware.util.cache.CacheFactory;
import org.jivesoftware.util.cache.ExternalizableUtil;
36 37 38 39
import org.xmpp.packet.IQ;
import org.xmpp.packet.JID;
import org.xmpp.packet.PacketError;

40 41 42 43
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
44 45
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
46
import java.util.concurrent.locks.Lock;
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69

/**
 * IQDiscoItemsHandler is responsible for handling disco#items requests. This class holds a map with
 * the main entities and the associated DiscoItemsProvider. We are considering the host of the
 * recipient JIDs as main entities. It's the DiscoItemsProvider responsibility to provide the items
 * associated with the JID's name together with any possible requested node.<p>
 * <p/>
 * For example, let's have in the entities map the following entries: "localhost" and
 * "conference.localhost". Associated with each entry we have different DiscoItemsProvider. Now we
 * receive a disco#items request for the following JID: "room@conference.localhost" which is a disco
 * request for a MUC room. So IQDiscoItemsHandler will look for the DiscoItemsProvider associated
 * with the JID's host which in this case is "conference.localhost". Once we have located the
 * provider we will delegate to the provider the responsibility to provide the items specific to
 * the JID's name which in this case is "room". Depending on the implementation, the items could be
 * the list of existing occupants if that information is publicly available. Finally, after we have
 * collected all the items provided by the provider we will add them to the reply. On the other
 * hand, if no provider was found or the provider has no information for the requested name/node
 * then a not-found error will be returned.<p>
 * <p/>
 * Publishing of client items is still not supported.
 *
 * @author Gaston Dombiak
 */
70 71
public class IQDiscoItemsHandler extends IQHandler implements ServerFeaturesProvider, ClusterEventListener,
        UserItemsProvider {
72

73
    public static final String NAMESPACE_DISCO_ITEMS = "http://jabber.org/protocol/disco#items";
74
    private Map<String,DiscoItemsProvider> entities = new HashMap<String,DiscoItemsProvider>();
75 76
    private Map<String, Element> localServerItems = new HashMap<String, Element>();
    private Cache<String, ClusteredServerItem> serverItems;
77
    private Map<String, DiscoItemsProvider> serverNodeProviders = new ConcurrentHashMap<String, DiscoItemsProvider>();
78 79 80 81 82
    private IQHandlerInfo info;
    private IQDiscoInfoHandler infoHandler;

    public IQDiscoItemsHandler() {
        super("XMPP Disco Items Handler");
83
        info = new IQHandlerInfo("query", NAMESPACE_DISCO_ITEMS);
84 85 86 87 88 89
    }

    public IQHandlerInfo getInfo() {
        return info;
    }

Gaston Dombiak's avatar
Gaston Dombiak committed
90
    public IQ handleIQ(IQ packet) {
91 92 93 94 95 96 97 98 99 100 101 102 103 104 105
        // Create a copy of the sent pack that will be used as the reply
        // we only need to add the requested items to the reply if any otherwise add 
        // a not found error
        IQ reply = IQ.createResultIQ(packet);
        
        // TODO Implement publishing client items
        if (IQ.Type.set == packet.getType()) {
            reply.setChildElement(packet.getChildElement().createCopy());
            reply.setError(PacketError.Condition.feature_not_implemented);
            return reply;
        }

        // Look for a DiscoItemsProvider associated with the requested entity.
        // We consider the host of the recipient JID of the packet as the entity. It's the 
        // DiscoItemsProvider responsibility to provide the items associated with the JID's name  
106
        // together with any possible requested node.
107
        DiscoItemsProvider itemsProvider = getProvider(packet.getTo() == null ?
108
                XMPPServer.getInstance().getServerInfo().getXMPPDomain() : packet.getTo().getDomain());
109 110 111 112 113 114 115 116 117 118 119
        if (itemsProvider != null) {
            // Get the JID's name
            String name = packet.getTo() == null ? null : packet.getTo().getNode();
            if (name == null || name.trim().length() == 0) {
                name = null;
            }
            // Get the requested node
            Element iq = packet.getChildElement();
            String node = iq.attributeValue("node");

            // Check if we have items associated with the requested name and node
120
            Iterator<DiscoItem> itemsItr = itemsProvider.getItems(name, node, packet.getFrom());
121 122 123 124
            if (itemsItr != null) {
                reply.setChildElement(iq.createCopy());
                Element queryElement = reply.getChildElement();

125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181
				// See if the requesting entity would like to apply 'result set
				// management'
				final Element rsmElement = packet.getChildElement().element(
						QName.get("set",
								ResultSet.NAMESPACE_RESULT_SET_MANAGEMENT));

				// apply RSM only if the element exists, and the (total) results
				// set is not empty.
				final boolean applyRSM = rsmElement != null
						&& itemsItr.hasNext();

				if (applyRSM) {
					if (!ResultSet.isValidRSMRequest(rsmElement))
					{
						reply.setError(PacketError.Condition.bad_request);
						return reply;
					}
					
					// Calculate which results to include.
					final List<DiscoItem> rsmResults;
					final List<DiscoItem> allItems = new ArrayList<DiscoItem>();
					while (itemsItr.hasNext()) {
						allItems.add(itemsItr.next());
					}
					final ResultSet<DiscoItem> rs = new ResultSetImpl<DiscoItem>(
							allItems);
					try {
						rsmResults = rs.applyRSMDirectives(rsmElement);
					} catch (NullPointerException e) {
						final IQ itemNotFound = IQ.createResultIQ(packet);
						itemNotFound.setError(PacketError.Condition.item_not_found);
						return itemNotFound;
					}

					// add the applicable results to the IQ-result
					for (DiscoItem item : rsmResults) {
						final Element resultElement = item.getElement();
						resultElement.setQName(new QName(resultElement
								.getName(), queryElement.getNamespace()));
						queryElement.add(resultElement.createCopy());
					}

					// overwrite the 'set' element.
					queryElement.remove(queryElement.element(
							QName.get("set",
									ResultSet.NAMESPACE_RESULT_SET_MANAGEMENT)));
					queryElement.add(rs.generateSetElementFromResults(rsmResults));
				} else {
					// don't apply RSM:
	                // Add to the reply all the items provided by the DiscoItemsProvider
	                Element item;
	                while (itemsItr.hasNext()) {
	                    item = itemsItr.next().getElement();
	                    item.setQName(new QName(item.getName(), queryElement.getNamespace()));
	                    queryElement.add(item.createCopy());
	                }
	             }
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
            }
            else {
                // If the DiscoItemsProvider has no items for the requested name and node 
                // then answer a not found error
                reply.setChildElement(packet.getChildElement().createCopy());
                reply.setError(PacketError.Condition.item_not_found);
            }
        }
        else {
            // If we didn't find a DiscoItemsProvider then answer a not found error
            reply.setChildElement(packet.getChildElement().createCopy());
            reply.setError(PacketError.Condition.item_not_found);
        }

        return reply;
    }

    /**
     * Returns the DiscoItemsProvider responsible for providing the items related to a given entity
     * or null if none was found.
     *
     * @param name the name of the identity.
     * @return the DiscoItemsProvider responsible for providing the items related to a given entity
     *         or null if none was found.
     */
    private DiscoItemsProvider getProvider(String name) {
208
        return entities.get(name);
209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
    }

    /**
     * Sets that a given DiscoItemsProvider will provide the items related to a given entity. This
     * message must be used when new modules (e.g. MUC) are implemented and need to provide
     * the items related to them.
     *
     * @param name     the name of the entity.
     * @param provider the DiscoItemsProvider that will provide the entity's items.
     */
    protected void setProvider(String name, DiscoItemsProvider provider) {
        entities.put(name, provider);
    }

    /**
     * Removes the DiscoItemsProvider related to a given entity.
     *
     * @param name the name of the entity.
     */
    protected void removeProvider(String name) {
        entities.remove(name);
    }

    /**
     * Adds the items provided by the new service that implements the ServerItemsProvider
     * interface. This information will be used whenever a disco for items is made against
     * the server (i.e. the packet's target is the server).
     * Example of item is: &lt;item jid='conference.localhost' name='Public chatrooms'/&gt;
     *
     * @param provider the ServerItemsProvider that provides new server items.
     */
240
    public void addServerItemsProvider(ServerItemsProvider provider) {
241
        DiscoServerItem discoItem;
242 243 244 245 246 247 248
        Iterator<DiscoServerItem> items = provider.getItems();
        if (items == null) {
            // Do nothing
            return;
        }
        while (items.hasNext()) {
            discoItem = items.next();
249
            // Add the element to the list of items related to the server
250
            addComponentItem(discoItem.getJID().toString(), discoItem.getNode(), discoItem.getName());
251

252
            // Add the new item as a valid entity that could receive info and items disco requests
253
            String host = discoItem.getJID().getDomain();
254 255 256 257 258
            infoHandler.setProvider(host, discoItem.getDiscoInfoProvider());
            setProvider(host, discoItem.getDiscoItemsProvider());
        }
    }

259 260 261 262 263 264 265
    /**
     * Removes the provided items as a service of the service.
     *
     * @param provider The provider that is being removed.
     */
    public void removeServerItemsProvider(ServerItemsProvider provider) {
        DiscoServerItem discoItem;
266 267 268 269 270 271 272
        Iterator<DiscoServerItem> items = provider.getItems();
        if (items == null) {
            // Do nothing
            return;
        }
        while (items.hasNext()) {
            discoItem = items.next();
273
            // Remove the item from the server items list
274
            removeComponentItem(discoItem.getJID().toString());
275 276

            // Remove the item as a valid entity that could receive info and items disco requests
277
            String host = discoItem.getJID().getDomain();
278 279 280 281 282 283
            infoHandler.removeProvider(host);
            removeProvider(host);
        }

    }

284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313
    /**
     * Sets the DiscoItemsProvider to use when a disco#items packet is sent to the server itself
     * and the specified node. For instance, if node matches "http://jabber.org/protocol/offline"
     * then a special DiscoItemsProvider should be use to return information about offline messages.
     *
     * @param node the node that the provider will handle.
     * @param provider the DiscoItemsProvider that will handle disco#items packets sent with the
     *        specified node.
     */
    public void setServerNodeInfoProvider(String node, DiscoItemsProvider provider) {
        serverNodeProviders.put(node, provider);
    }

    /**
     * Removes the DiscoItemsProvider to use when a disco#items packet is sent to the server itself
     * and the specified node.
     *
     * @param node the node that the provider was handling.
     */
    public void removeServerNodeInfoProvider(String node) {
        serverNodeProviders.remove(node);
    }

    /**
     * Registers a new disco item for a component. The jid attribute of the item will match the jid
     * of the component and the name should be the name of the component discovered using disco.
     *
     * @param jid the jid of the component.
     * @param name the discovered name of the component.
     */
Gaston Dombiak's avatar
Gaston Dombiak committed
314 315 316 317 318 319 320 321 322 323 324 325
    public void addComponentItem(String jid, String name) {
        addComponentItem(jid, null, name);
    }

    /**
     * Registers a new disco item for a component. The jid attribute of the item will match the jid
     * of the component and the name should be the name of the component discovered using disco.
     *
     * @param jid the jid of the component.
     * @param node the node that complements the jid address.
     * @param name the discovered name of the component.
     */
326
    public void addComponentItem(String jid, String node, String name) {
327
        Lock lock = CacheFactory.getLock(jid, serverItems);
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350
        try {
            lock.lock();
            ClusteredServerItem item = serverItems.get(jid);
            if (item == null) {
                // First time a node registers a server item for this component
                item = new ClusteredServerItem();

                Element element = DocumentHelper.createElement("item");
                element.addAttribute("jid", jid);
                element.addAttribute("node", node);
                element.addAttribute("name", name);
                item.element = element;
            }
            if (item.nodes.add(XMPPServer.getInstance().getNodeID())) {
                // Update the cache with latest info
                serverItems.put(jid, item);
            }
            // Keep track of the new server item added by this JVM
            localServerItems.put(jid, item.element);
        }
        finally {
            lock.unlock();
        }
351 352 353 354 355 356 357
    }

    /**
     * Removes a disco item for a component that has been removed from the server.
     *
     * @param jid the jid of the component being removed.
     */
358
    public void removeComponentItem(String jid) {
359 360 361 362
        if (serverItems == null) {
            // Safety check
            return;
        }
363
        Lock lock = CacheFactory.getLock(jid, serverItems);
364 365 366 367 368 369 370 371 372 373 374
        try {
            lock.lock();
            ClusteredServerItem item = serverItems.get(jid);
            if (item != null && item.nodes.remove(XMPPServer.getInstance().getNodeID())) {
                // Update the cache with latest info
                if (item.nodes.isEmpty()) {
                    serverItems.remove(jid);
                }
                else {
                    serverItems.put(jid, item);
                }
375 376
            }
        }
377 378 379 380 381
        finally {
            lock.unlock();
        }
        // Remove locally added server item
        localServerItems.remove(jid);
382 383 384 385
    }

    public void initialize(XMPPServer server) {
        super.initialize(server);
386
        serverItems = CacheFactory.createCache("Disco Server Items");
387 388 389
        // Track the implementors of ServerItemsProvider so that we can collect the items
        // provided by the server
        infoHandler = server.getIQDiscoInfoHandler();
390
        setProvider(server.getServerInfo().getXMPPDomain(), getServerItemsProvider());
391 392
        // Listen to cluster events
        ClusterManager.addListener(this);
393 394 395 396 397 398 399 400 401
    }

    public void start() throws IllegalStateException {
        super.start();
        for (ServerItemsProvider provider : XMPPServer.getInstance().getServerItemsProviders()) {
            addServerItemsProvider(provider);
        }
    }

402 403
    public Iterator<String> getFeatures() {
        List<String> features = new ArrayList<String>();
404 405 406 407 408 409
        features.add("http://jabber.org/protocol/disco#items");
        // TODO Comment out this line when publishing of client items is implemented
        //features.add("http://jabber.org/protocol/disco#publish");
        return features.iterator();
    }

410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
    public void joinedCluster() {
        restoreCacheContent();
    }

    public void joinedCluster(byte[] nodeID) {
        // Do nothing
    }

    public void leftCluster() {
        if (!XMPPServer.getInstance().isShuttingDown()) {
            restoreCacheContent();
        }
    }

    public void leftCluster(byte[] nodeID) {
        if (ClusterManager.isSeniorClusterMember()) {
426
            NodeID leftNode = NodeID.getInstance(nodeID);
427 428
            for (Map.Entry<String, ClusteredServerItem> entry : serverItems.entrySet()) {
                String jid = entry.getKey();
429
                Lock lock = CacheFactory.getLock(jid, serverItems);
430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456
                try {
                    lock.lock();
                    ClusteredServerItem item = entry.getValue();
                    if (item.nodes.remove(leftNode)) {
                        // Update the cache with latest info
                        if (item.nodes.isEmpty()) {
                            serverItems.remove(jid);
                        }
                        else {
                            serverItems.put(jid, item);
                        }
                    }
                }
                finally {
                    lock.unlock();
                }
            }
        }
    }

    public void markedAsSeniorClusterMember() {
        // Do nothing
    }
    private void restoreCacheContent() {
        for (Map.Entry<String, Element> entry : localServerItems.entrySet()) {
            String jid = entry.getKey();
            Element element = entry.getValue();
457
            Lock lock = CacheFactory.getLock(jid, serverItems);
458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
            try {
                lock.lock();
                ClusteredServerItem item = serverItems.get(jid);
                if (item == null) {
                    // First time a node registers a server item for this component
                    item = new ClusteredServerItem();
                    item.element = element;
                }
                if (item.nodes.add(XMPPServer.getInstance().getNodeID())) {
                    // Update the cache with latest info
                    serverItems.put(jid, item);
                }
            }
            finally {
                lock.unlock();
            }
        }
    }

477
    private DiscoItemsProvider getServerItemsProvider() {
478
        return new DiscoItemsProvider() {
479
            public Iterator<DiscoItem> getItems(String name, String node, JID senderJID) {
480 481 482 483 484 485 486 487
                if (node != null) {
                    // Check if there is a provider for the requested node
                    if (serverNodeProviders.get(node) != null) {
                        return serverNodeProviders.get(node).getItems(name, node, senderJID);
                    }
                    return null;
                }
                if (name == null) {
488
                    List<DiscoItem> answer = new ArrayList<DiscoItem>();
489
                    for (ClusteredServerItem item : serverItems.values()) {
490
                        answer.add(new DiscoItem(item.element));
491 492
                    }
                    return answer.iterator();
493 494
                }
                else {
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
                    // If addressed to user@domain, add items from UserItemsProviders to
                    // the reply.
                    List<UserItemsProvider> itemsProviders = XMPPServer.getInstance().getUserItemsProviders();
                    if (itemsProviders.isEmpty()) {
                        // If we didn't find any UserItemsProviders, then answer a not found error
                        return null;
                    }
                    List<DiscoItem> answer = new ArrayList<DiscoItem>();
                    for (UserItemsProvider itemsProvider : itemsProviders) {
                        // Check if we have items associated with the requested name
                        Iterator<Element> itemsItr = itemsProvider.getUserItems(name, senderJID);
                        if (itemsItr != null) {
                            // Add to the reply all the items provided by the UserItemsProvider
                            Element item;
                            while (itemsItr.hasNext()) {
                                item = itemsItr.next();
                                JID itemJid = new JID(item.attributeValue("jid"));
                                String itemName = item.attributeValue("name");
                                String itemNode = item.attributeValue("node");
                                String itemAction = item.attributeValue("action");
                                answer.add(new DiscoItem(itemJid, itemName, itemNode, itemAction));
                            }
                        }
                    }
                    return answer.iterator();
520 521 522 523
                }
            }
        };
    }
524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541

    private static class ClusteredServerItem implements Externalizable {
        private Element element;
        private Set<NodeID> nodes = new HashSet<NodeID>();

        public ClusteredServerItem() {
        }

        public void writeExternal(ObjectOutput out) throws IOException {
            ExternalizableUtil.getInstance().writeSerializable(out, (DefaultElement) element);
            ExternalizableUtil.getInstance().writeExternalizableCollection(out, nodes);
        }

        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
            element = (Element) ExternalizableUtil.getInstance().readSerializable(in);
            ExternalizableUtil.getInstance().readExternalizableCollection(in, nodes, getClass().getClassLoader());
        }
    }
542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564

    public Iterator<Element> getUserItems(String name, JID senderJID) {
        List<Element> answer = new ArrayList<Element>();
        try {
            User user = UserManager.getInstance().getUser(name);
            RosterItem item = user.getRoster().getRosterItem(senderJID);
            // If the requesting entity is subscribed to the account's presence then
            // answer the user's "available resources"
            if (item.getSubStatus() == RosterItem.SUB_FROM ||
                    item.getSubStatus() == RosterItem.SUB_BOTH) {
                for (Session session : SessionManager.getInstance().getSessions(name)) {
                    Element element = DocumentHelper.createElement("item");
                    element.addAttribute("jid", session.getAddress().toString());
                    answer.add(element);
                }
            }
            return answer.iterator();
        }
        catch (UserNotFoundException e) {
            return answer.iterator();
        }
    }
}