iqdiscoinfohandler.java

基于Jabber协议的即时消息服务器

        serverNodeProviders.remove(node);
    }

    /**
     * Returns the DiscoInfoProvider responsible for providing information about a given entity or
     * null if none was found.
     *
     * @param name the name of the identity.
     * @return the DiscoInfoProvider responsible for providing information about a given entity or
     *         null if none was found.
     */
    private DiscoInfoProvider getProvider(String name) {
        return entities.get(name);
    }

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

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

    /**
     * Adds the features provided by the new service that implements the ServerFeaturesProvider
     * interface. This information will be used whenever a disco for information is made against
     * the server (i.e. the packet's target is the server).
     * Example of features are: jabber:iq:agents, jabber:iq:time, etc.
     *
     * @param provider the ServerFeaturesProvider that provides new server features.
     */
    private void addServerFeaturesProvider(ServerFeaturesProvider provider) {
        for (Iterator<String> it = provider.getFeatures(); it.hasNext();) {
            addServerFeature(it.next());
        }
    }

    /**
     * Adds one specific feature to the information returned whenever a disco for information is
     * made against the server.
     *
     * @param namespace the namespace identifying the new server feature.
     * @return true if the new feature was successfully added.
     */
    public boolean addServerFeature(String namespace) {
        return serverFeatures.add(namespace);
    }

    /**
     * Removes a feature from the information returned whenever a disco for information is
     * made against the server.
     *
     * @param namespace the namespace of the feature to be removed.
     */
    public void removeServerFeature(String namespace) {
        serverFeatures.remove(namespace);
    }

    public void initialize(XMPPServer server) {
        super.initialize(server);
        // Track the implementors of ServerFeaturesProvider so that we can collect the features
        // provided by the server
        for (ServerFeaturesProvider provider : server.getServerFeaturesProviders()) {
            addServerFeaturesProvider(provider);
        }
        setProvider(server.getServerInfo().getName(), getServerInfoProvider());
    }

    /**
     * Returns the DiscoInfoProvider responsible for providing information at the server level. This
     * means that this DiscoInfoProvider will provide information whenever a disco request whose
     * recipient JID is the server (e.g. localhost) is made.
     *
     * @return the DiscoInfoProvider responsible for providing information at the server level.
     */
    private DiscoInfoProvider getServerInfoProvider() {
        DiscoInfoProvider discoInfoProvider = new DiscoInfoProvider() {
            final ArrayList<Element> identities = new ArrayList<Element>();

            public Iterator<Element> getIdentities(String name, String node, JID senderJID) {
                if (node != null && serverNodeProviders.get(node) != null) {
                    // Redirect the request to the disco info provider of the specified node
                    return serverNodeProviders.get(node).getIdentities(name, node, senderJID);
                }
                if (name == null) {
                    // Answer identity of the server
                    synchronized (identities) {
                        if (identities.isEmpty()) {
                            Element identity = DocumentHelper.createElement("identity");
                            identity.addAttribute("category", "server");
                            identity.addAttribute("name", JiveGlobals.getProperty(
                                    "xmpp.server.name", "Wildfire Server"));
                            identity.addAttribute("type", "im");

                            identities.add(identity);
                        }
                    }
                    return identities.iterator();
                }
                else {
                    if (SessionManager.getInstance().isAnonymousRoute(name)) {
                        // Answer identity of an anonymous user.
                        return anonymousUserIdentities.iterator();
                    }
                    else {
                        // Answer identity of a registered user.
                        // Note: We know that this user exists because #hasInfo returned true
                        return registeredUserIdentities.iterator();
                    }
                }
            }

            public Iterator<String> getFeatures(String name, String node, JID senderJID) {
                if (node != null && serverNodeProviders.get(node) != null) {
                    // Redirect the request to the disco info provider of the specified node
                    return serverNodeProviders.get(node).getFeatures(name, node, senderJID);
                }
                if (name == null) {
                    // Answer features of the server
                    return serverFeatures.iterator();
                }
                else {
                    // Answer features of the user
                    return userFeatures.iterator();
                }
            }

            public boolean hasInfo(String name, String node, JID senderJID) {
                if (node != null) {
                    if (serverNodeProviders.get(node) != null) {
                        // Redirect the request to the disco info provider of the specified node
                        return serverNodeProviders.get(node).hasInfo(name, node, senderJID);
                    }
                    // Unknown node
                    return false;
                }
                try {
                    // True if it is an info request of the server, a registered user or an
                    // anonymous user. We now support disco of user's bare JIDs
                    return name == null || UserManager.getInstance().getUser(name) != null ||
                            SessionManager.getInstance().isAnonymousRoute(name);
                }
                catch (UserNotFoundException e) {
                    return false;
                }
            }

            public XDataFormImpl getExtendedInfo(String name, String node, JID senderJID) {
                if (node != null && serverNodeProviders.get(node) != null) {
                    // Redirect the request to the disco info provider of the specified node
                    return serverNodeProviders.get(node).getExtendedInfo(name, node, senderJID);
                }
                return null;
            }
        };
        return discoInfoProvider;
    }
}