pubsubmodule.java

来自「基于Jabber协议的即时消息服务器」· Java 代码 · 共 694 行 · 第 1/2 页

/**
 * $RCSfile: $
 * $Revision: $
 * $Date: $
 *
 * Copyright (C) 2006 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution.
 */

package org.jivesoftware.wildfire.pubsub;

import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.jivesoftware.util.JiveGlobals;
import org.jivesoftware.util.LocaleUtils;
import org.jivesoftware.util.Log;
import org.jivesoftware.util.StringUtils;
import org.jivesoftware.wildfire.PacketRouter;
import org.jivesoftware.wildfire.RoutableChannelHandler;
import org.jivesoftware.wildfire.RoutingTable;
import org.jivesoftware.wildfire.XMPPServer;
import org.jivesoftware.wildfire.auth.UnauthorizedException;
import org.jivesoftware.wildfire.container.BasicModule;
import org.jivesoftware.wildfire.disco.DiscoInfoProvider;
import org.jivesoftware.wildfire.disco.DiscoItemsProvider;
import org.jivesoftware.wildfire.disco.DiscoServerItem;
import org.jivesoftware.wildfire.disco.ServerItemsProvider;
import org.jivesoftware.wildfire.forms.DataForm;
import org.jivesoftware.wildfire.forms.spi.XDataFormImpl;
import org.jivesoftware.wildfire.forms.spi.XFormFieldImpl;
import org.jivesoftware.wildfire.pubsub.models.AccessModel;
import org.jivesoftware.wildfire.pubsub.models.PublisherModel;
import org.xmpp.packet.*;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Module that implements JEP-60: Publish-Subscribe. By default node collections and
 * instant nodes are supported.
 *
 * @author Matt Tucker
 */
public class PubSubModule extends BasicModule implements ServerItemsProvider, DiscoInfoProvider,
        DiscoItemsProvider, RoutableChannelHandler, PubSubService {

    /**
     * the chat service's hostname
     */
    private String serviceName = null;

    /**
     * Collection node that acts as the root node of the entire node hierarchy.
     */
    private CollectionNode rootCollectionNode = null;

    /**
     * Nodes managed by this manager, table: key nodeID (String); value Node
     */
    private Map<String, Node> nodes = new ConcurrentHashMap<String, Node>();
    /**
     * Returns the permission policy for creating nodes. A true value means that not anyone can
     * create a node, only the JIDs listed in <code>allowedToCreate</code> are allowed to create
     * nodes.
     */
    private boolean nodeCreationRestricted = false;

    /**
     * Bare jids of users that are allowed to create nodes. An empty list means that anyone can
     * create nodes.
     */
    private Collection<String> allowedToCreate = new CopyOnWriteArrayList<String>();

    /**
     * Bare jids of users that are system administrators of the PubSub service. A sysadmin
     * has the same permissions as a node owner.
     */
    private Collection<String> sysadmins = new CopyOnWriteArrayList<String>();

    /**
     * The packet router for the server.
     */
    private PacketRouter router = null;

    private RoutingTable routingTable = null;

    /**
     * Default configuration to use for newly created leaf nodes.
     */
    private DefaultNodeConfiguration leafDefaultConfiguration;
    /**
     * Default configuration to use for newly created collection nodes.
     */
    private DefaultNodeConfiguration collectionDefaultConfiguration;

    /**
     * Private component that actually performs the pubsub work.
     */
    private PubSubEngine engine = null;

    public PubSubModule() {
        super("Publish Subscribe Service");
    }

    public void process(Packet packet) {
        // TODO Remove this method when moving PubSub as a component and removing module code
        // The MUC service will receive all the packets whose domain matches the domain of the MUC
        // service. This means that, for instance, a disco request should be responded by the
        // service itself instead of relying on the server to handle the request.
        try {
            // Check if the packet is a disco request or a packet with namespace iq:register
            if (packet instanceof IQ) {
                if (!engine.process((IQ) packet)) {
                    process((IQ) packet);
                }
            }
            else if (packet instanceof Presence) {
                engine.process((Presence) packet);
            }
            else {
                engine.process((Message) packet);
            }
        }
        catch (Exception e) {
            Log.error(LocaleUtils.getLocalizedString("admin.error"), e);
            if (packet instanceof IQ) {
                // Send internal server error
                IQ reply = IQ.createResultIQ((IQ) packet);
                reply.setError(PacketError.Condition.internal_server_error);
                send(reply);
            }
        }
    }

    private void process(IQ iq) {
        // Ignore IQs of type ERROR
        if (IQ.Type.error == iq.getType()) {
            return;
        }
        Element childElement = iq.getChildElement();
        String namespace = null;

        if (childElement != null) {
            namespace = childElement.getNamespaceURI();
        }
        if ("http://jabber.org/protocol/disco#info".equals(namespace)) {
            try {
                // TODO PubSub should have an IQDiscoInfoHandler of its own when PubSub becomes
                // a component
                IQ reply = XMPPServer.getInstance().getIQDiscoInfoHandler().handleIQ(iq);
                router.route(reply);
            }
            catch (UnauthorizedException e) {
                // Do nothing. This error should never happen
            }
        }
        else if ("http://jabber.org/protocol/disco#items".equals(namespace)) {
            try {
                // TODO PubSub should have an IQDiscoItemsHandler of its own when PubSub becomes
                // a component
                IQ reply = XMPPServer.getInstance().getIQDiscoItemsHandler().handleIQ(iq);
                router.route(reply);
            }
            catch (UnauthorizedException e) {
                // Do nothing. This error should never happen
            }
        }
        else {
            // Unknown namespace requested so return error to sender
            engine.sendErrorPacket(iq, PacketError.Condition.service_unavailable, null);
        }
    }

    public String getServiceID() {
        return "pubsub";
    }

    public boolean canCreateNode(JID creator) {
        // Node creation is always allowed for sysadmin
        if (isNodeCreationRestricted() && !isServiceAdmin(creator)) {
            // The user is not allowed to create nodes
            return false;
        }
        return true;
    }

    public boolean isServiceAdmin(JID user) {
        return sysadmins.contains(user.toBareJID()) || allowedToCreate.contains(user.toBareJID());
    }

    public boolean isInstantNodeSupported() {
        return true;
    }

    public boolean isCollectionNodesSupported() {
        return true;
    }

    public CollectionNode getRootCollectionNode() {
        return rootCollectionNode;
    }

    public DefaultNodeConfiguration getDefaultNodeConfiguration(boolean leafType) {
        if (leafType) {
            return leafDefaultConfiguration;
        }
        return collectionDefaultConfiguration;
    }

    public Collection<String> getShowPresences(JID subscriber) {
        return engine.getShowPresences(subscriber);
    }

    public void presenceSubscriptionNotRequired(Node node, JID user) {
        engine.presenceSubscriptionNotRequired(node, user);
    }

    public void presenceSubscriptionRequired(Node node, JID user) {
        engine.presenceSubscriptionRequired(node, user);
    }

    public PubSubEngine getPubSubEngine() {
        return engine;
    }

    public String getServiceName() {
        return serviceName;
    }

    public String getServiceDomain() {
        return serviceName + "." + XMPPServer.getInstance().getServerInfo().getName();
    }

    public JID getAddress() {
        // TODO Cache this JID for performance?
        return new JID(null, getServiceDomain(), null);
    }

    public Collection<String> getUsersAllowedToCreate() {
        return allowedToCreate;
    }

    public Collection<String> getSysadmins() {
        return sysadmins;
    }

    public void addSysadmin(String userJID) {
        sysadmins.add(userJID.trim().toLowerCase());
        // Update the config.
        String[] jids = new String[sysadmins.size()];
        jids = sysadmins.toArray(jids);
        JiveGlobals.setProperty("xmpp.pubsub.sysadmin.jid", fromArray(jids));
    }

    public void removeSysadmin(String userJID) {
        sysadmins.remove(userJID.trim().toLowerCase());
        // Update the config.
        String[] jids = new String[sysadmins.size()];
        jids = sysadmins.toArray(jids);
        JiveGlobals.setProperty("xmpp.pubsub.sysadmin.jid", fromArray(jids));
    }

    public boolean isNodeCreationRestricted() {
        return nodeCreationRestricted;
    }

    public void setNodeCreationRestricted(boolean nodeCreationRestricted) {
        this.nodeCreationRestricted = nodeCreationRestricted;
        JiveGlobals.setProperty("xmpp.pubsub.create.anyone", Boolean.toString(nodeCreationRestricted));
    }

    public void addUserAllowedToCreate(String userJID) {
        // Update the list of allowed JIDs to create nodes.
        allowedToCreate.add(userJID.trim().toLowerCase());
        // Update the config.
        String[] jids = new String[allowedToCreate.size()];
        jids = allowedToCreate.toArray(jids);
        JiveGlobals.setProperty("xmpp.pubsub.create.jid", fromArray(jids));
    }

    public void removeUserAllowedToCreate(String userJID) {
        // Update the list of allowed JIDs to create nodes.
        allowedToCreate.remove(userJID.trim().toLowerCase());
        // Update the config.
        String[] jids = new String[allowedToCreate.size()];
        jids = allowedToCreate.toArray(jids);
        JiveGlobals.setProperty("xmpp.pubsub.create.jid", fromArray(jids));
    }

    public void initialize(XMPPServer server) {
        super.initialize(server);

        serviceName = JiveGlobals.getProperty("xmpp.pubsub.service");
        if (serviceName == null) {
            serviceName = "pubsub";
        }
        // Load the list of JIDs that are sysadmins of the PubSub service
        String property = JiveGlobals.getProperty("xmpp.pubsub.sysadmin.jid");
        String[] jids;
        if (property != null) {
            jids = property.split(",");
            for (String jid : jids) {
                sysadmins.add(jid.trim().toLowerCase());
            }
        }
        nodeCreationRestricted =
                Boolean.parseBoolean(JiveGlobals.getProperty("xmpp.pubsub.create.anyone", "false"));
        // Load the list of JIDs that are allowed to create nodes
        property = JiveGlobals.getProperty("xmpp.pubsub.create.jid");
        if (property != null) {
            jids = property.split(",");
            for (String jid : jids) {
                allowedToCreate.add(jid.trim().toLowerCase());
            }
        }

        routingTable = server.getRoutingTable();
        router = server.getPacketRouter();

        engine = new PubSubEngine(this, server.getPacketRouter());

        // Load default configuration for leaf nodes
        leafDefaultConfiguration = PubSubPersistenceManager.loadDefaultConfiguration(this, true);
        if (leafDefaultConfiguration == null) {
            // Create and save default configuration for leaf nodes;
            leafDefaultConfiguration = new DefaultNodeConfiguration(true);
            leafDefaultConfiguration.setAccessModel(AccessModel.open);
            leafDefaultConfiguration.setPublisherModel(PublisherModel.publishers);
            leafDefaultConfiguration.setDeliverPayloads(true);
            leafDefaultConfiguration.setLanguage("English");
            leafDefaultConfiguration.setMaxPayloadSize(5120);
            leafDefaultConfiguration.setNotifyConfigChanges(true);
            leafDefaultConfiguration.setNotifyDelete(true);
            leafDefaultConfiguration.setNotifyRetract(true);
            leafDefaultConfiguration.setPersistPublishedItems(false);
            leafDefaultConfiguration.setMaxPublishedItems(-1);
            leafDefaultConfiguration.setPresenceBasedDelivery(false);
            leafDefaultConfiguration.setSendItemSubscribe(true);
            leafDefaultConfiguration.setSubscriptionEnabled(true);
            leafDefaultConfiguration.setReplyPolicy(null);
            PubSubPersistenceManager.createDefaultConfiguration(this, leafDefaultConfiguration);
        }
        // Load default configuration for collection nodes
        collectionDefaultConfiguration =