Move Packet 'properties' from core to extensions

Code for Jive's packet properties should not be in 'core'. Also
de-serializing input from network causes some security implications, it
is therefore disabled as default.

core/src/main/java/org/jivesoftware/smack/packet/Packet.java

@@ -20,29 +20,21 @@ package org.jivesoftware.smack.packet;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 
-import java.io.ByteArrayOutputStream;
+import java.util.ArrayList;
-import java.io.ObjectOutputStream;
+import java.util.Collection;
-import java.io.Serializable;
+import java.util.Collections;
-import java.util.*;
+import java.util.List;
+import java.util.Locale;
 import java.util.concurrent.CopyOnWriteArrayList;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * Base class for XMPP packets. Every packet has a unique ID (which is automatically
- * generated, but can be overriden). Optionally, the "to" and "from" fields can be set,
+ * generated, but can be overridden). Optionally, the "to" and "from" fields can be set.
- * as well as an arbitrary number of properties.
- *
- * Properties provide an easy mechanism for clients to share data. Each property has a
- * String name, and a value that is a Java primitive (int, long, float, double, boolean)
- * or any Serializable object (a Java object is Serializable when it implements the
- * Serializable interface).
  *
  * @author Matt Tucker
  */
 public abstract class Packet {
-    private static final Logger LOGGER = Logger.getLogger(Packet.class.getName());
+
-    
     protected static final String DEFAULT_LANGUAGE =
             java.util.Locale.getDefault().getLanguage().toLowerCase(Locale.US);
 
@@ -88,7 +80,6 @@ public abstract class Packet {
     private final List<PacketExtension> packetExtensions
             = new CopyOnWriteArrayList<PacketExtension>();
 
-    private final Map<String,Object> properties = new HashMap<String, Object>();
     private XMPPError error = null;
 
     public Packet() {
@@ -292,60 +283,6 @@ public abstract class Packet {
         packetExtensions.remove(extension);
     }
 
-    /**
-     * Returns the packet property with the specified name or <tt>null</tt> if the
-     * property doesn't exist. Property values that were originally primitives will
-     * be returned as their object equivalent. For example, an int property will be
-     * returned as an Integer, a double as a Double, etc.
-     *
-     * @param name the name of the property.
-     * @return the property, or <tt>null</tt> if the property doesn't exist.
-     */
-    public synchronized Object getProperty(String name) {
-        if (properties == null) {
-            return null;
-        }
-        return properties.get(name);
-    }
-
-    /**
-     * Sets a property with an Object as the value. The value must be Serializable
-     * or an IllegalArgumentException will be thrown.
-     *
-     * @param name the name of the property.
-     * @param value the value of the property.
-     */
-    public synchronized void setProperty(String name, Object value) {
-        if (!(value instanceof Serializable)) {
-            throw new IllegalArgumentException("Value must be serialiazble");
-        }
-        properties.put(name, value);
-    }
-
-    /**
-     * Deletes a property.
-     *
-     * @param name the name of the property to delete.
-     */
-    public synchronized void deleteProperty(String name) {
-        if (properties == null) {
-            return;
-        }
-        properties.remove(name);
-    }
-
-    /**
-     * Returns an unmodifiable collection of all the property names that are set.
-     *
-     * @return all property names.
-     */
-    public synchronized Collection<String> getPropertyNames() {
-        if (properties == null) {
-            return Collections.emptySet();
-        }
-        return Collections.unmodifiableSet(new HashSet<String>(properties.keySet()));
-    }
-
     /**
      * Returns the packet as XML. Every concrete extension of Packet must implement
      * this method. In addition to writing out packet-specific data, every sub-class
@@ -368,88 +305,6 @@ public abstract class Packet {
         for (PacketExtension extension : getExtensions()) {
             xml.append(extension.toXML());
         }
-        // Add in packet properties.
-        if (properties != null && !properties.isEmpty()) {
-            xml.halfOpenElement("properties").xmlnsAttribute("http://www.jivesoftware.com/xmlns/xmpp/properties");
-            xml.rightAngelBracket();
-            // Loop through all properties and write them out.
-            for (String name : getPropertyNames()) {
-                Object value = getProperty(name);
-                xml.openElement("property");
-                xml.element("name", name);
-                xml.halfOpenElement("value");
-
-                String type;
-                String valueStr;
-                if (value instanceof Integer) {
-                    type = "integer";
-                    valueStr = Integer.toString((Integer)value);
-                }
-                else if (value instanceof Long) {
-                    type = "long";
-                    valueStr = Long.toString((Long) value);
-                }
-                else if (value instanceof Float) {
-                    type = "float";
-                    valueStr = Float.toString((Float) value);
-                }
-                else if (value instanceof Double) {
-                    type = "double";
-                    valueStr = Double.toString((Double) value);
-                }
-                else if (value instanceof Boolean) {
-                    type = "boolean";
-                    valueStr = Boolean.toString((Boolean) value);
-                }
-                else if (value instanceof String) {
-                    type = "string";
-                    valueStr = (String) value;
-                }
-                // Otherwise, it's a generic Serializable object. Serialized objects are in
-                // a binary format, which won't work well inside of XML. Therefore, we base-64
-                // encode the binary data before adding it.
-                else {
-                    ByteArrayOutputStream byteStream = null;
-                    ObjectOutputStream out = null;
-                    try {
-                        byteStream = new ByteArrayOutputStream();
-                        out = new ObjectOutputStream(byteStream);
-                        out.writeObject(value);
-                        type ="java-object";
-                        valueStr = StringUtils.encodeBase64(byteStream.toByteArray());
-                    }
-                    catch (Exception e) {
-                        LOGGER.log(Level.SEVERE, "Error encoding java object", e);
-                        type ="java-object";
-                        valueStr = "Serializing error: " + e.getMessage();
-                    }
-                    finally {
-                        if (out != null) {
-                            try {
-                                out.close();
-                            }
-                            catch (Exception e) {
-                                // Ignore.
-                            }
-                        }
-                        if (byteStream != null) {
-                            try {
-                                byteStream.close();
-                            }
-                            catch (Exception e) {
-                                // Ignore.
-                            }
-                        }
-                    }
-                }
-                xml.attribute("type", type);
-                xml.rightAngelBracket();
-                xml.escape(valueStr);
-                xml.closeElement("value");
-                xml.closeElement("property");
-            }
-            xml.closeElement("properties");
-        }
         return xml;
     }
 
@@ -479,10 +334,6 @@ public abstract class Packet {
         if (packetID != null ? !packetID.equals(packet.packetID) : packet.packetID != null) {
             return false;
         }
-        if (properties != null ? !properties.equals(packet.properties)
-                : packet.properties != null) {
-            return false;
-        }
         if (to != null ? !to.equals(packet.to) : packet.to != null)  { return false; }
         return !(xmlns != null ? !xmlns.equals(packet.xmlns) : packet.xmlns != null);
     }
@@ -495,7 +346,6 @@ public abstract class Packet {
         result = 31 * result + (to != null ? to.hashCode() : 0);
         result = 31 * result + (from != null ? from.hashCode() : 0);
         result = 31 * result + packetExtensions.hashCode();
-        result = 31 * result + properties.hashCode();
         result = 31 * result + (error != null ? error.hashCode() : 0);
         return result;
     }

core/src/main/java/org/jivesoftware/smack/util/PacketParserUtils.java

@@ -16,9 +16,7 @@
  */
 package org.jivesoftware.smack.util;
 
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.ObjectInputStream;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -55,12 +53,6 @@ import org.xmlpull.v1.XmlPullParserException;
  */
 public class PacketParserUtils {
     private static final Logger LOGGER = Logger.getLogger(PacketParserUtils.class.getName());
-    
-    /**
-     * Namespace used to store packet properties.
-     */
-    private static final String PROPERTIES_NAMESPACE =
-            "http://www.jivesoftware.com/xmlns/xmpp/properties";
 
     /**
      * Parses a message packet.
@@ -69,7 +61,7 @@ public class PacketParserUtils {
      * @return a Message packet.
      * @throws Exception if an exception occurs while parsing the packet.
      */
-    public static Packet parseMessage(XmlPullParser parser) throws Exception {
+    public static Message parseMessage(XmlPullParser parser) throws Exception {
         Message message = new Message();
         String id = parser.getAttributeValue("", "id");
         message.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
@@ -93,7 +85,6 @@ public class PacketParserUtils {
         // in arbitrary sub-elements.
         boolean done = false;
         String thread = null;
-        Map<String, Object> properties = null;
         while (!done) {
             int eventType = parser.next();
             if (eventType == XmlPullParser.START_TAG) {
@@ -131,11 +122,6 @@ public class PacketParserUtils {
                 else if (elementName.equals("error")) {
                     message.setError(parseError(parser));
                 }
-                else if (elementName.equals("properties") &&
-                        namespace.equals(PROPERTIES_NAMESPACE))
-                {
-                    properties = parseProperties(parser);
-                }
                 // Otherwise, it must be a packet extension.
                 else {
                     message.addExtension(
@@ -150,12 +136,6 @@ public class PacketParserUtils {
         }
 
         message.setThread(thread);
-        // Set packet properties.
-        if (properties != null) {
-            for (String name : properties.keySet()) {
-                message.setProperty(name, properties.get(name));
-            }
-        }
         return message;
     }
 
@@ -246,15 +226,6 @@ public class PacketParserUtils {
                 else if (elementName.equals("error")) {
                     presence.setError(parseError(parser));
                 }
-                else if (elementName.equals("properties") &&
-                        namespace.equals(PROPERTIES_NAMESPACE))
-                {
-                    Map<String,Object> properties = parseProperties(parser);
-                    // Set packet properties.
-                    for (String name : properties.keySet()) {
-                        presence.setProperty(name, properties.get(name));
-                    }
-                }
                 // Otherwise, it must be a packet extension.
                 else {
                 	try {
@@ -549,87 +520,6 @@ public class PacketParserUtils {
         return methods;
     }
 
-    /**
-     * Parse a properties sub-packet. If any errors occur while de-serializing Java object
-     * properties, an exception will be printed and not thrown since a thrown
-     * exception will shut down the entire connection. ClassCastExceptions will occur
-     * when both the sender and receiver of the packet don't have identical versions
-     * of the same class.
-     *
-     * @param parser the XML parser, positioned at the start of a properties sub-packet.
-     * @return a map of the properties.
-     * @throws Exception if an error occurs while parsing the properties.
-     */
-    public static Map<String, Object> parseProperties(XmlPullParser parser) throws Exception {
-        Map<String, Object> properties = new HashMap<String, Object>();
-        while (true) {
-            int eventType = parser.next();
-            if (eventType == XmlPullParser.START_TAG && parser.getName().equals("property")) {
-                // Parse a property
-                boolean done = false;
-                String name = null;
-                String type = null;
-                String valueText = null;
-                Object value = null;
-                while (!done) {
-                    eventType = parser.next();
-                    if (eventType == XmlPullParser.START_TAG) {
-                        String elementName = parser.getName();
-                        if (elementName.equals("name")) {
-                            name = parser.nextText();
-                        }
-                        else if (elementName.equals("value")) {
-                            type = parser.getAttributeValue("", "type");
-                            valueText = parser.nextText();
-                        }
-                    }
-                    else if (eventType == XmlPullParser.END_TAG) {
-                        if (parser.getName().equals("property")) {
-                            if ("integer".equals(type)) {
-                                value = Integer.valueOf(valueText);
-                            }
-                            else if ("long".equals(type))  {
-                                value = Long.valueOf(valueText);
-                            }
-                            else if ("float".equals(type)) {
-                                value = Float.valueOf(valueText);
-                            }
-                            else if ("double".equals(type)) {
-                                value = Double.valueOf(valueText);
-                            }
-                            else if ("boolean".equals(type)) {
-                                value = Boolean.valueOf(valueText);
-                            }
-                            else if ("string".equals(type)) {
-                                value = valueText;
-                            }
-                            else if ("java-object".equals(type)) {
-                                try {
-                                    byte [] bytes = StringUtils.decodeBase64(valueText);
-                                    ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes));
-                                    value = in.readObject();
-                                }
-                                catch (Exception e) {
-                                    LOGGER.log(Level.SEVERE, "Error parsing java object", e);
-                                }
-                            }
-                            if (name != null && value != null) {
-                                properties.put(name, value);
-                            }
-                            done = true;
-                        }
-                    }
-                }
-            }
-            else if (eventType == XmlPullParser.END_TAG) {
-                if (parser.getName().equals("properties")) {
-                    break;
-                }
-            }
-        }
-        return properties;
-    }
-
     /**
      * Parses SASL authentication error packets.
      * 

documentation/extensions/intro.html

@@ -90,6 +90,11 @@
             <td><a href="http://www.xmpp.org/extensions/xep-0332.html">XEP-0332</a></td>
             <td>Allows to transport HTTP communication over XMPP peer-to-peer networks.</td>
         </tr>
+        <tr>
+            <td><a href="properties.html">Jive Properties</a></td>
+            <td>N/A</td>
+            <td>TODO</td>
+        </tr>
     </table>
 </body>
 </html>

documentation/extensions/properties.html

@@ -10,10 +10,6 @@
 Packet Properties
 </div>
 
-<div class="nav">
-&laquo; <a href="index.html">Table of Contents</a>
-</div>
-
 <p>
 Smack provides an easy mechanism for attaching arbitrary properties to packets. Each property
 has a String name, and a value that is a Java primitive (int, long, float, double, boolean) or
@@ -32,10 +28,13 @@ demonstrates how to set properties:
 
 <div class="code"><pre>
 Message message = chat.createMessage();
+JivePropertiesExtension jpe = new JivePropertiesExtension();
 <font color="gray"><i>// Add a Color object as a property.</i></font>
-message.setProperty(<font color="blue">"favoriteColor"</font>, new Color(0, 0, 255));
+jpe.setProperty(<font color="blue">"favoriteColor"</font>, new Color(0, 0, 255));
 <font color="gray"><i>// Add an int as a property.</i></font>
-message.setProperty(<font color="blue">"favoriteNumber"</font>, 4);
+jpe.setProperty(<font color="blue">"favoriteNumber"</font>, 4);
+<font color="gray"><i>// Add the JivePropertiesExtension to the message packet</i></font>
+message.addPacketExtension(jpe);
 chat.sendMessage(message);
 </pre></div>
 
@@ -45,14 +44,23 @@ Getting those same properties would use the following code:
 
 <div class="code"><pre>
 Message message = chat.nextMessage();
+<font color="gray"><i>// Get the JivePropertiesExtension</i></font>
+JivePropertiesExtension jpe = message.getExtension(JivePropertiesExtension.NAMESPACE);
 <font color="gray"><i>// Get a Color object property.</i></font>
-Color favoriteColor = (Color)message.getProperty(<font color="blue">"favoriteColor"</font>);
+Color favoriteColor = (Color)jpe.getProperty(<font color="blue">"favoriteColor"</font>);
 <font color="gray"><i>// Get an int property. Note that properties are always returned as
 // Objects, so we must cast the value to an Integer, then convert
 // it to an int.</i></font>
-int favoriteNumber = ((Integer)message.getProperty(<font color="blue">"favoriteNumber"</font>)).intValue();
+int favoriteNumber = ((Integer)jpe.getProperty(<font color="blue">"favoriteNumber"</font>)).intValue();
 </pre></div>
 
+<p>
+For convenience <code>JivePropertiesManager</code> contains two helper
+methods namely <code>addProperty(Packet packet, String name, Object
+value)</code> and
+<code>getProperty(Packet packet, String name)</code>.
+</p>
+
 <p class="subheader">
 Objects as Properties
 </p>
@@ -63,10 +71,6 @@ you should keep the following in mind:
 </p>
 
 <ul>
- 	<li>Packet extensions are the more standard way to add extra data to XMPP stanzas. Using
-		properties may be more convenient in some cases, however, since Smack will do the
-		work of handling the XML.
-
 	<li>When you send a Java object as a property, only clients running Java will be able to 
 		interpret the data. So, consider using a series of primitive values to transfer data 
 		instead.

documentation/extensions/toc.html

@@ -24,6 +24,7 @@
 <a href="pubsub.html">PubSub</a><br>
 <a href="caps.html">Entity Capabilities</a><br>
 <a href="privacy.html">Privacy</a><br>
+<a href="properties.html">JiveProperties</a>
 </p>
 
 </body>

documentation/index.html

@@ -20,7 +20,6 @@
 	<li><a href="roster.html">Roster and Presence</a>
 	<li><a href="processing.html">Processing Incoming Packets</a>
 	<li><a href="providers.html">Provider Architecture</a>
-    <li><a href="properties.html">Packet Properties</a>
     <li><a href="debugging.html">Debugging with Smack</a>
     <p>
     <li><a href="extensions/index.html">Smack Extensions Manual</a>

extensions/src/main/java/org/jivesoftware/smackx/jiveproperties/JivePropertiesManager.java

@@ -0,0 +1,77 @@
+/**
+ *
+ * Copyright 2014 Florian Schmaus.
+ *
+ * Licensed 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.jivesoftware.smackx.jiveproperties;
+
+import org.jivesoftware.smack.packet.Packet;
+import org.jivesoftware.smackx.jiveproperties.packet.JivePropertiesExtension;
+
+public class JivePropertiesManager {
+
+    private static boolean javaObjectEnabled = false;
+
+    /**
+     * Enables deserialization of Java objects embedded in the 'properties' packet extension. Since
+     * this is a security sensitive feature, it is disabled per default in Smack. Only enable it if
+     * you are sure that you understand the potential security implications it can cause.
+     * <p>
+     * See also:
+     * <ul>
+     * <li> <a href="http://stackoverflow.com/questions/19054460/">"What is the security impact of deserializing untrusted data in Java?" on Stackoverflow<a>
+     * <ul>
+     * @param enabled true to enable Java object deserialization
+     */
+    public static void setJavaObjectEnabled(boolean enabled) {
+        JivePropertiesManager.javaObjectEnabled = enabled;
+    }
+
+    public static boolean isJavaObjectEnabled() {
+        return javaObjectEnabled;
+    }
+
+    /**
+     * Convenience method to add a property to a packet.
+     * 
+     * @param packet the packet to add the property to.
+     * @param name the name of the property to add.
+     * @param value the value of the property to add.
+     */
+    public static void addProperty(Packet packet, String name, Object value) {
+        JivePropertiesExtension jpe = (JivePropertiesExtension) packet.getExtension(JivePropertiesExtension.NAMESPACE);
+        if (jpe == null) {
+            jpe = new JivePropertiesExtension();
+            packet.addExtension(jpe);
+        }
+        jpe.setProperty(name, value);
+    }
+
+    /**
+     * Convenience method to get a property from a packet. Will return null if the packet contains
+     * not property with the given name.
+     * 
+     * @param packet
+     * @param name
+     * @return the property or <tt>null</tt> if none found.
+     */
+    public static Object getProperty(Packet packet, String name) {
+        Object res = null;
+        JivePropertiesExtension jpe = (JivePropertiesExtension) packet.getExtension(JivePropertiesExtension.NAMESPACE);
+        if (jpe != null) {
+            res = jpe.getProperty(name);
+        }
+        return res;
+    }
+}

extensions/src/main/java/org/jivesoftware/smackx/jiveproperties/packet/JivePropertiesExtension.java

@@ -0,0 +1,210 @@
+/**
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * Licensed 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.jivesoftware.smackx.jiveproperties.packet;
+
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+
+/**
+ * Properties provide an easy mechanism for clients to share data. Each property has a
+ * String name, and a value that is a Java primitive (int, long, float, double, boolean)
+ * or any Serializable object (a Java object is Serializable when it implements the
+ * Serializable interface).
+ *
+ */
+public class JivePropertiesExtension implements PacketExtension {
+    /**
+     * Namespace used to store packet properties.
+     */
+    public static final String NAMESPACE = "http://www.jivesoftware.com/xmlns/xmpp/properties";
+
+    public static final String ELEMENT = "properties";
+
+    private static final Logger LOGGER = Logger.getLogger(JivePropertiesExtension.class.getName());
+    
+    private final Map<String, Object> properties;
+
+    public JivePropertiesExtension() {
+        properties = new HashMap<String, Object>();
+    }
+
+    public JivePropertiesExtension(Map<String, Object> properties) {
+        this.properties = properties;
+    }
+
+    /**
+     * Returns the packet property with the specified name or <tt>null</tt> if the
+     * property doesn't exist. Property values that were originally primitives will
+     * be returned as their object equivalent. For example, an int property will be
+     * returned as an Integer, a double as a Double, etc.
+     *
+     * @param name the name of the property.
+     * @return the property, or <tt>null</tt> if the property doesn't exist.
+     */
+    public synchronized Object getProperty(String name) {
+        if (properties == null) {
+            return null;
+        }
+        return properties.get(name);
+    }
+
+    /**
+     * Sets a property with an Object as the value. The value must be Serializable
+     * or an IllegalArgumentException will be thrown.
+     *
+     * @param name the name of the property.
+     * @param value the value of the property.
+     */
+    public synchronized void setProperty(String name, Object value) {
+        if (!(value instanceof Serializable)) {
+            throw new IllegalArgumentException("Value must be serialiazble");
+        }
+        properties.put(name, value);
+    }
+
+    /**
+     * Deletes a property.
+     *
+     * @param name the name of the property to delete.
+     */
+    public synchronized void deleteProperty(String name) {
+        if (properties == null) {
+            return;
+        }
+        properties.remove(name);
+    }
+
+    /**
+     * Returns an unmodifiable collection of all the property names that are set.
+     *
+     * @return all property names.
+     */
+    public synchronized Collection<String> getPropertyNames() {
+        if (properties == null) {
+            return Collections.emptySet();
+        }
+        return Collections.unmodifiableSet(new HashSet<String>(properties.keySet()));
+    }
+ 
+    @Override
+    public String getElementName() {
+        return ELEMENT;
+    }
+
+    @Override
+    public String getNamespace() {
+        return NAMESPACE;
+    }
+
+    @Override
+    public CharSequence toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.rightAngelBracket();
+        // Loop through all properties and write them out.
+        for (String name : getPropertyNames()) {
+            Object value = getProperty(name);
+            xml.openElement("property");
+            xml.element("name", name);
+            xml.halfOpenElement("value");
+
+            String type;
+            String valueStr;
+            if (value instanceof Integer) {
+                type = "integer";
+                valueStr = Integer.toString((Integer) value);
+            }
+            else if (value instanceof Long) {
+                type = "long";
+                valueStr = Long.toString((Long) value);
+            }
+            else if (value instanceof Float) {
+                type = "float";
+                valueStr = Float.toString((Float) value);
+            }
+            else if (value instanceof Double) {
+                type = "double";
+                valueStr = Double.toString((Double) value);
+            }
+            else if (value instanceof Boolean) {
+                type = "boolean";
+                valueStr = Boolean.toString((Boolean) value);
+            }
+            else if (value instanceof String) {
+                type = "string";
+                valueStr = (String) value;
+            }
+            // Otherwise, it's a generic Serializable object. Serialized objects are in
+            // a binary format, which won't work well inside of XML. Therefore, we base-64
+            // encode the binary data before adding it.
+            else {
+                ByteArrayOutputStream byteStream = null;
+                ObjectOutputStream out = null;
+                try {
+                    byteStream = new ByteArrayOutputStream();
+                    out = new ObjectOutputStream(byteStream);
+                    out.writeObject(value);
+                    type = "java-object";
+                    valueStr = StringUtils.encodeBase64(byteStream.toByteArray());
+                }
+                catch (Exception e) {
+                    LOGGER.log(Level.SEVERE, "Error encoding java object", e);
+                    type = "java-object";
+                    valueStr = "Serializing error: " + e.getMessage();
+                }
+                finally {
+                    if (out != null) {
+                        try {
+                            out.close();
+                        }
+                        catch (Exception e) {
+                            // Ignore.
+                        }
+                    }
+                    if (byteStream != null) {
+                        try {
+                            byteStream.close();
+                        }
+                        catch (Exception e) {
+                            // Ignore.
+                        }
+                    }
+                }
+            }
+            xml.attribute("type", type);
+            xml.rightAngelBracket();
+            xml.escape(valueStr);
+            xml.closeElement("value");
+            xml.closeElement("property");
+        }
+        xml.closeElement(this);
+
+        return xml;
+    }
+
+}

extensions/src/main/java/org/jivesoftware/smackx/jiveproperties/provider/JivePropertiesExtensionProvider.java

@@ -0,0 +1,127 @@
+/**
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * Licensed 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.jivesoftware.smackx.jiveproperties.provider;
+
+import java.io.ByteArrayInputStream;
+import java.io.ObjectInputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smack.provider.PacketExtensionProvider;
+import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smackx.jiveproperties.JivePropertiesManager;
+import org.jivesoftware.smackx.jiveproperties.packet.JivePropertiesExtension;
+import org.xmlpull.v1.XmlPullParser;
+
+public class JivePropertiesExtensionProvider implements PacketExtensionProvider {
+
+    private static final Logger LOGGER = Logger.getLogger(JivePropertiesExtensionProvider.class.getName());
+
+    /**
+     * Parse a properties sub-packet. If any errors occur while de-serializing Java object
+     * properties, an exception will be printed and not thrown since a thrown exception will shut
+     * down the entire connection. ClassCastExceptions will occur when both the sender and receiver
+     * of the packet don't have identical versions of the same class.
+     * <p>
+     * Note that you have to explicitly enabled Java object deserialization with @{link
+     * {@link JivePropertiesManager#setJavaObjectEnabled(boolean)}
+     * 
+     * @param parser the XML parser, positioned at the start of a properties sub-packet.
+     * @return a map of the properties.
+     * @throws Exception if an error occurs while parsing the properties.
+     */
+    @Override
+    public PacketExtension parseExtension(XmlPullParser parser) throws Exception {
+        Map<String, Object> properties = new HashMap<String, Object>();
+        while (true) {
+            int eventType = parser.next();
+            if (eventType == XmlPullParser.START_TAG && parser.getName().equals("property")) {
+                // Parse a property
+                boolean done = false;
+                String name = null;
+                String type = null;
+                String valueText = null;
+                Object value = null;
+                while (!done) {
+                    eventType = parser.next();
+                    if (eventType == XmlPullParser.START_TAG) {
+                        String elementName = parser.getName();
+                        if (elementName.equals("name")) {
+                            name = parser.nextText();
+                        }
+                        else if (elementName.equals("value")) {
+                            type = parser.getAttributeValue("", "type");
+                            valueText = parser.nextText();
+                        }
+                    }
+                    else if (eventType == XmlPullParser.END_TAG) {
+                        if (parser.getName().equals("property")) {
+                            if ("integer".equals(type)) {
+                                value = Integer.valueOf(valueText);
+                            }
+                            else if ("long".equals(type))  {
+                                value = Long.valueOf(valueText);
+                            }
+                            else if ("float".equals(type)) {
+                                value = Float.valueOf(valueText);
+                            }
+                            else if ("double".equals(type)) {
+                                value = Double.valueOf(valueText);
+                            }
+                            else if ("boolean".equals(type)) {
+                                value = Boolean.valueOf(valueText);
+                            }
+                            else if ("string".equals(type)) {
+                                value = valueText;
+                            }
+                            else if ("java-object".equals(type)) {
+                                if (JivePropertiesManager.isJavaObjectEnabled()) {
+                                    try {
+                                        byte[] bytes = StringUtils.decodeBase64(valueText);
+                                        ObjectInputStream in = new ObjectInputStream(
+                                                        new ByteArrayInputStream(bytes));
+                                        value = in.readObject();
+                                    }
+                                    catch (Exception e) {
+                                        LOGGER.log(Level.SEVERE, "Error parsing java object", e);
+                                    }
+                                }
+                                else {
+                                    LOGGER.severe("JavaObject is not enabled. Enable with JivePropertiesManager.setJavaObjectEnabled(true)");
+                                }
+                            }
+                            if (name != null && value != null) {
+                                properties.put(name, value);
+                            }
+                            done = true;
+                        }
+                    }
+                }
+            }
+            else if (eventType == XmlPullParser.END_TAG) {
+                if (parser.getName().equals(JivePropertiesExtension.ELEMENT)) {
+                    break;
+                }
+            }
+        }
+        return new JivePropertiesExtension(properties);
+    }
+
+}

extensions/src/main/resources/org.jivesoftware.smackx/extensions.providers

@@ -456,4 +456,10 @@
         <className>org.jivesoftware.smackx.amp.provider.AMPExtensionProvider</className>
     </extensionProvider>
 
+    <!-- JiveProperties -->
+    <extensionProvider>
+        <elementName>properties</elementName>
+        <namespace>http://www.jivesoftware.com/xmlns/xmpp/properties</namespace>
+        <className>org.jivesoftware.smackx.jiveproperties.provider.JivePropertiesExtensionProvider</className>
+    </extensionProvider>
 </smackProviders>

extensions/src/test/java/org/jivesoftware/smackx/jiveproperties/JivePropertiesExtensionTest.java

@@ -0,0 +1,66 @@
+/**
+ *
+ * Copyright 2014 Florian Schmaus
+ *
+ * Licensed 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.jivesoftware.smackx.jiveproperties;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.test.util.TestUtils;
+import org.jivesoftware.smack.util.PacketParserUtils;
+import org.jivesoftware.smackx.InitExtensions;
+import org.jivesoftware.smackx.jiveproperties.packet.JivePropertiesExtension;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class JivePropertiesExtensionTest extends InitExtensions {
+
+    @Before
+    public void setUp() {
+        JivePropertiesManager.setJavaObjectEnabled(true);
+    }
+
+    @After
+    public void tearDown() {
+        JivePropertiesManager.setJavaObjectEnabled(false);
+    }
+
+    @Test
+    public void checkProvider() throws Exception {
+        // @formatter:off
+        String properties = "<message from='romeo@example.net/orchard' to='juliet@example.com/balcony'>"
+                        + "<body>Neither, fair saint, if either thee dislike.</body>"
+                        + "<properties xmlns='http://www.jivesoftware.com/xmlns/xmpp/properties'>"
+                        + "<property>"
+                        + "<name>FooBar</name>"
+                        + "<value type='integer'>42</value>"
+                        + "</property>"
+                        + "</properties>"
+                        + "</message>";
+        // @formatter:on
+
+        Message message = PacketParserUtils.parseMessage(TestUtils.getMessageParser(properties));
+        JivePropertiesExtension jpe = (JivePropertiesExtension) message.getExtension(JivePropertiesExtension.NAMESPACE);
+        assertNotNull(jpe);
+
+        Integer integer = (Integer) jpe.getProperty("FooBar");
+        assertNotNull(integer);
+        int fourtytwo = integer;
+        assertEquals(42, fourtytwo);
+    }
+}