001/**
002 *
003 * Copyright 2014 Georg Lukas.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.jivesoftware.smackx.iqversion;
019
020import java.util.Map;
021import java.util.WeakHashMap;
022
023import org.jivesoftware.smack.ConnectionCreationListener;
024import org.jivesoftware.smack.Manager;
025import org.jivesoftware.smack.SmackConfiguration;
026import org.jivesoftware.smack.SmackException.NoResponseException;
027import org.jivesoftware.smack.SmackException.NotConnectedException;
028import org.jivesoftware.smack.XMPPConnection;
029import org.jivesoftware.smack.XMPPConnectionRegistry;
030import org.jivesoftware.smack.XMPPException.XMPPErrorException;
031import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
032import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
033import org.jivesoftware.smack.packet.IQ;
034import org.jivesoftware.smack.packet.StanzaError.Condition;
035
036import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
037import org.jivesoftware.smackx.iqversion.packet.Version;
038
039import org.jxmpp.jid.Jid;
040
041/**
042 * A Version Manager that automatically responds to version IQs with a predetermined reply.
043 *
044 * <p>
045 * The VersionManager takes care of handling incoming version request IQs, according to
046 * XEP-0092 (Software Version). You can configure the version reply for a given connection
047 * by running the following code:
048 * </p>
049 *
050 * <pre>
051 * Version MY_VERSION = new Version("My Little XMPP Application", "v1.23", "OS/2 32-bit");
052 * VersionManager.getInstanceFor(mConnection).setVersion(MY_VERSION);
053 * </pre>
054 *
055 * @author Georg Lukas
056 */
057public final class VersionManager extends Manager {
058    private static final Map<XMPPConnection, VersionManager> INSTANCES = new WeakHashMap<>();
059
060    private static Version defaultVersion;
061
062    private Version ourVersion = defaultVersion;
063
064    public static void setDefaultVersion(String name, String version) {
065        setDefaultVersion(name, version, null);
066    }
067
068    public static void setDefaultVersion(String name, String version, String os) {
069        defaultVersion = generateVersionFrom(name, version, os);
070    }
071
072    private static boolean autoAppendSmackVersion = true;
073
074    static {
075        XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
076            @Override
077            public void connectionCreated(XMPPConnection connection) {
078                VersionManager.getInstanceFor(connection);
079            }
080        });
081    }
082
083    private VersionManager(final XMPPConnection connection) {
084        super(connection);
085
086        ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
087        sdm.addFeature(Version.NAMESPACE);
088
089        connection.registerIQRequestHandler(new AbstractIqRequestHandler(Version.ELEMENT, Version.NAMESPACE, IQ.Type.get,
090                        Mode.async) {
091            @Override
092            public IQ handleIQRequest(IQ iqRequest) {
093                if (ourVersion == null) {
094                    return IQ.createErrorResponse(iqRequest, Condition.not_acceptable);
095                }
096
097                return Version.createResultFor(iqRequest, ourVersion);
098            }
099        });
100    }
101
102    public static synchronized VersionManager getInstanceFor(XMPPConnection connection) {
103        VersionManager versionManager = INSTANCES.get(connection);
104
105        if (versionManager == null) {
106            versionManager = new VersionManager(connection);
107            INSTANCES.put(connection, versionManager);
108        }
109
110        return versionManager;
111    }
112
113    public static void setAutoAppendSmackVersion(boolean autoAppendSmackVersion) {
114        VersionManager.autoAppendSmackVersion = autoAppendSmackVersion;
115    }
116
117    public void setVersion(String name, String version) {
118        setVersion(name, version, null);
119    }
120
121    public void setVersion(String name, String version, String os) {
122        ourVersion = generateVersionFrom(name, version, os);
123    }
124
125    public void unsetVersion() {
126        ourVersion = null;
127    }
128
129    public boolean isSupported(Jid jid) throws NoResponseException, XMPPErrorException,
130                    NotConnectedException, InterruptedException {
131        return ServiceDiscoveryManager.getInstanceFor(connection()).supportsFeature(jid,
132                        Version.NAMESPACE);
133    }
134
135    /**
136     * Request version information from a given JID.
137     *
138     * @param jid
139     * @return the version information or {@code null} if not supported by JID
140     * @throws NoResponseException
141     * @throws XMPPErrorException
142     * @throws NotConnectedException
143     * @throws InterruptedException
144     */
145    public Version getVersion(Jid jid) throws NoResponseException, XMPPErrorException,
146                    NotConnectedException, InterruptedException {
147        if (!isSupported(jid)) {
148            return null;
149        }
150        return connection().createStanzaCollectorAndSend(new Version(jid)).nextResultOrThrow();
151    }
152
153    private static Version generateVersionFrom(String name, String version, String os) {
154        if (autoAppendSmackVersion) {
155            name += " (Smack " + SmackConfiguration.getVersion() + ')';
156        }
157        return new Version(name, version, os);
158    }
159}