* fleshing out XMPP entities, adding XmppWriter and XmppSerializer

having spent the last couple of days wrestling with .NET XmlSerializer
  and trying to get it to do what is required by XMPP (RFC 3920 & 3921)
  this is the preliminary result of that wrestling (you should see the
  other guy!): XmppSerializer allows us to serialize Xmpp stanza (and
  theoretically deserialize [or reify] them), XmppWriter helps avoiding
  various gratuitous crap added in by off-the-shelf XmlSerializer.

  this is currently not used anywhere but the plan is to use it for 
  at least an XMPPBridgeModule.

OpenSim/Framework/Communications/XMPP/XmppError.cs

@@ -25,10 +25,17 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using System;
+using System.Xml;
+using System.Xml.Serialization;
+
 namespace OpenSim.Framework.Communications.XMPP
 {
-    public class XMPPParser
+    [XmlRoot("error")]
+    public class XmppErrorStanza
     {
-
+        public XmppErrorStanza()
+        {
+        }
     }
 }

OpenSim/Framework/Communications/XMPP/XmppIqStanza.cs

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Xml;
+using System.Xml.Serialization;
+
+namespace OpenSim.Framework.Communications.XMPP
+{
+    /// <summary>
+    /// An IQ needs to have one of the follow types set.
+    /// </summary>
+    public enum XmppIqType
+    {
+        [XmlEnum("set")] set,
+        [XmlEnum("get")] get,
+        [XmlEnum("result")] result,
+        [XmlEnum("error")] error,
+    }
+
+    /// <summary>
+    /// XmppIqStanza needs to be subclassed as the query content is
+    /// specific to the query type.
+    /// </summary>
+    [XmlRoot("iq")]
+    public abstract class XmppIqStanza: XmppStanza
+    {
+        /// <summary>
+        /// IQ type: one of set, get, result, error
+        /// </summary>
+        [XmlAttribute("type")]
+        public XmppIqType Type;
+
+        public XmppIqStanza(): base()
+        {
+        }
+    }
+}

OpenSim/Framework/Communications/XMPP/XmppMessageStanza.cs

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Xml;
+using System.Xml.Serialization;
+
+namespace OpenSim.Framework.Communications.XMPP
+{
+    /// <summary>
+    /// Message types.
+    /// </summary>
+    public enum XmppMessageType
+    {
+        [XmlEnum("chat")] chat,
+        [XmlEnum("error")] error,
+        [XmlEnum("groupchat")] groupchat,
+        [XmlEnum("headline")] headline,
+        [XmlEnum("normal")] normal,
+    }
+
+    /// <summary>
+    /// Message body.
+    /// </summary>
+    public class XmppMessageBody
+    {
+        [XmlText]
+        public string Text;
+
+        public XmppMessageBody()
+        {
+        }
+
+        public XmppMessageBody(string message)
+        {
+            Text = message;
+        }
+    }
+
+    [XmlRoot("message")]
+    public class XmppMessageStanza: XmppStanza
+    {
+        /// <summary>
+        /// IQ type: one of set, get, result, error
+        /// </summary>
+        [XmlAttribute("type")]
+        public XmppMessageType MessageType;
+
+        // [XmlAttribute("error")]
+        // public XmppError Error;
+
+        [XmlElement("body")]
+        public XmppMessageBody Body;
+
+        public XmppMessageStanza() : base()
+        {
+        }
+
+        public XmppMessageStanza(string fromJid, string toJid, XmppMessageType mType, string message) :
+            base(fromJid, toJid)
+        {
+            MessageType = mType;
+            Body = new XmppMessageBody(message);
+        }
+    }
+}

OpenSim/Framework/Communications/XMPP/XmppSerializer.cs

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Xml;
+using System.Xml.Serialization;
+
+namespace OpenSim.Framework.Communications.XMPP
+{
+    public class XMPPSerializer
+    {
+        // need to do it this way, as XmlSerializer(type, extratypes)
+        // does not work on mono (at least).
+        private Dictionary<Type, XmlSerializer> _serializers = new Dictionary<Type, XmlSerializer>();
+        private XmlSerializerNamespaces _xmlNs;
+        private string _defaultNS;
+
+        public XMPPSerializer(bool server)
+        {
+            _xmlNs = new XmlSerializerNamespaces();
+            _xmlNs.Add(String.Empty, String.Empty);
+            if (server) 
+                _defaultNS = "jabber:server";
+            else
+                _defaultNS = "jabber:client";
+
+            _serializers[typeof(XmppMessageStanza)] = new XmlSerializer(typeof(XmppMessageStanza), _defaultNS);
+        }
+
+        public void Serialize(XmlWriter xw, object o)
+        {
+            if (!_serializers.ContainsKey(o.GetType())) 
+                throw new ArgumentException(String.Format("no serializer available for type {0}", o.GetType()));
+
+            _serializers[o.GetType()].Serialize(xw, o, _xmlNs);
+        }
+    }
+}

OpenSim/Framework/Communications/XMPP/XmppStanza.cs

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Xml;
+using System.Xml.Serialization;
+
+namespace OpenSim.Framework.Communications.XMPP
+{
+    public abstract class XmppStanza
+    {
+        /// <summary>
+        /// counter used for generating ID
+        /// </summary>
+        [XmlIgnore]
+        private static ulong _ctr = 0;
+
+        /// <summary>
+        /// recipient JID
+        /// </summary>
+        [XmlAttribute("to")]
+        public string ToJid;
+
+        /// <summary>
+        /// sender JID
+        /// </summary>
+        [XmlAttribute("from")]
+        public string FromJid;
+
+        /// <summary>
+        /// unique ID.
+        /// </summary>
+        [XmlAttribute("id")]
+        public string MessageId;
+
+        public XmppStanza()
+        {
+        }
+
+        public XmppStanza(string fromJid, string toJid)
+        {
+            ToJid = toJid;
+            FromJid = fromJid;
+            MessageId = String.Format("OpenSim_{0}{1}", DateTime.UtcNow.Ticks, _ctr++);
+        }
+    }
+}

OpenSim/Framework/Communications/XMPP/XmppWriter.cs

@@ -25,31 +25,34 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-using System;
+using System.IO;
+using System.Text;
 using System.Xml;
 
+using IOStream = System.IO.Stream;
+
 namespace OpenSim.Framework.Communications.XMPP
 {
-    public class Stanza
+    public class XMPPWriter: XmlTextWriter
     {
-        public string localName = String.Empty;
+        public XMPPWriter(TextWriter textWriter) : base(textWriter)
-        public JId to;
-        public JId from;
-        public string id;
-        public string lang;
-        public string nodeName;
-
-        public Stanza(XmlNode node, Object defaults, bool hasID)
         {
-
         }
-        //public virtual XmlElement getNode()
+
-        //{
+        public XMPPWriter(IOStream stream) : this(stream, Encoding.UTF8)
-            //return new XmlElement();
+        {
-        //}
+        }
-        public virtual string generateId()
+
+        public XMPPWriter(IOStream stream, Encoding enc) : base(stream, enc)
+        {
+        }
+
+        public override void WriteStartDocument()
+        {
+        }
+
+        public override void WriteStartDocument(bool standalone)
         {
-            return "";
         }
     }
 }