From 7692f3e18f49fc57b63efbe54b7ac71de2fb7e16 Mon Sep 17 00:00:00 2001
From: Dr Scofield
Date: Mon, 14 Jul 2008 12:18:32 +0000
Subject: further work in progress on the HttpServer side: XmlRpc handler path
 almost complete and soon to be ready for testing; OSHttpResponse code out.

---
 OpenSim/Framework/Servers/BaseHttpServer.cs      |   2 +-
 OpenSim/Framework/Servers/OSHttpHandler.cs       |  25 +-
 OpenSim/Framework/Servers/OSHttpRequest.cs       |  39 ++-
 OpenSim/Framework/Servers/OSHttpRequestPump.cs   |  80 ++++--
 OpenSim/Framework/Servers/OSHttpResponse.cs      | 305 +++++++++++++++++++----
 OpenSim/Framework/Servers/OSHttpXmlRpcHandler.cs | 222 +++++++++++++++++
 6 files changed, 594 insertions(+), 79 deletions(-)
 create mode 100644 OpenSim/Framework/Servers/OSHttpXmlRpcHandler.cs

diff --git a/OpenSim/Framework/Servers/BaseHttpServer.cs b/OpenSim/Framework/Servers/BaseHttpServer.cs
index 22698d0..9d2a804 100644
--- a/OpenSim/Framework/Servers/BaseHttpServer.cs
+++ b/OpenSim/Framework/Servers/BaseHttpServer.cs
@@ -416,7 +416,7 @@ namespace OpenSim.Framework.Servers
             {
                 try
                 {
-                    response.OutputStream.Close();
+                    response.Send();
                 }
                 catch (SocketException e)
                 {
diff --git a/OpenSim/Framework/Servers/OSHttpHandler.cs b/OpenSim/Framework/Servers/OSHttpHandler.cs
index da96cca..a9f42f3 100644
--- a/OpenSim/Framework/Servers/OSHttpHandler.cs
+++ b/OpenSim/Framework/Servers/OSHttpHandler.cs
@@ -59,10 +59,18 @@ namespace OpenSim.Framework.Servers
     {
         Unprocessed,
         Pass,
-        Handled,
-        Detached,
+        Done,
     }
 
+    /// <summary>
+    /// An OSHttpHandler that matches on the "content-type" header can
+    /// supply an OSHttpContentTypeChecker delegate which will be
+    /// invoked by the request matcher in OSHttpRequestPump.
+    /// </summary>
+    /// <returns>true if the handler is interested in the content;
+    /// false otherwise</returns>
+    public delegate bool OSHttpContentTypeChecker(OSHttpRequest req);
+
     public interface OSHttpHandler
     {
         /// <summary>
@@ -98,6 +106,19 @@ namespace OpenSim.Framework.Servers
             get;
         }
 
+
+        /// <summary>
+        /// An OSHttpHandler that matches on the "content-type" header can
+        /// supply an OSHttpContentTypeChecker delegate which will be
+        /// invoked by the request matcher in OSHttpRequestPump.
+        /// </summary>
+        /// <returns>true if the handler is interested in the content;
+        /// false otherwise</returns>
+        OSHttpContentTypeChecker ContentTypeChecker
+        { 
+            get;
+        }
+
         OSHttpHandlerResult Process(OSHttpRequest request);
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Framework/Servers/OSHttpRequest.cs b/OpenSim/Framework/Servers/OSHttpRequest.cs
index c523143..7549f08 100644
--- a/OpenSim/Framework/Servers/OSHttpRequest.cs
+++ b/OpenSim/Framework/Servers/OSHttpRequest.cs
@@ -59,7 +59,7 @@ namespace OpenSim.Framework.Servers
         private IPEndPoint _ipEndPoint;
 
         private HttpRequest _request;
-        // private HttpClientContext _context;
+        private HttpClientContext _context;
 
         public string[] AcceptTypes
         {
@@ -152,11 +152,28 @@ namespace OpenSim.Framework.Servers
             get { return _ipEndPoint; }
         }
 
-        public HttpRequest HttpRequest
+
+        internal HttpRequest HttpRequest
         {
             get { return _request; }
         }
 
+        internal HttpClientContext HttpClientContext
+        {
+            get { return _context; }
+        }
+        
+        /// <summary>
+        /// Internal whiteboard for handlers to store temporary stuff
+        /// into.
+        /// </summary>
+        internal Dictionary<string, object> Whiteboard
+        {
+            get { return _whiteboard; }
+        }
+        private Dictionary<string, object> _whiteboard = new Dictionary<string, object>();
+
+
         public OSHttpRequest()
         {
         }
@@ -185,7 +202,7 @@ namespace OpenSim.Framework.Servers
 
         public OSHttpRequest(HttpClientContext context, HttpRequest req)
         {
-            // _context = context;
+            _context = context;
             _request = req;
 
             _acceptTypes = req.AcceptTypes;
@@ -215,5 +232,21 @@ namespace OpenSim.Framework.Servers
             // _isSecureConnection = req.IsSecureConnection;
             // _isAuthenticated = req.IsAuthenticated;
         }
+
+        public override string ToString()
+        {
+            StringBuilder me = new StringBuilder();
+            me.Append(String.Format("OSHttpRequest: {0} {1}\n", HttpMethod, RawUrl));
+            foreach (string k in Headers.AllKeys)
+            {
+                me.Append(String.Format("    {0}: {1}\n", k, Headers[k]));
+            }
+            if (null != RemoteIPEndPoint)
+            {
+                me.Append(String.Format("    IP: {0}\n", RemoteIPEndPoint.ToString()));
+            }
+
+            return me.ToString();
+        }
     }
 }
diff --git a/OpenSim/Framework/Servers/OSHttpRequestPump.cs b/OpenSim/Framework/Servers/OSHttpRequestPump.cs
index 4218be5..56714fa 100644
--- a/OpenSim/Framework/Servers/OSHttpRequestPump.cs
+++ b/OpenSim/Framework/Servers/OSHttpRequestPump.cs
@@ -28,6 +28,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
+using System.IO;
 using System.Net;
 using System.Reflection;
 using System.Text.RegularExpressions;
@@ -114,7 +115,7 @@ namespace OpenSim.Framework.Servers
                         
                     // process req: we try each handler in turn until
                     // we are either out of handlers or get back a
-                    // Handled or Detached
+                    // Pass or Done
                     OSHttpHandlerResult rc = OSHttpHandlerResult.Unprocessed;
                     foreach (OSHttpHandler h in handlers)
                     {
@@ -123,22 +124,35 @@ namespace OpenSim.Framework.Servers
                         // Pass: handler did not process the request,
                         // try next handler
                         if (OSHttpHandlerResult.Pass == rc) continue;
-                        // Detached: handler is taking over processing
-                        // of request, we are done
-                        if (OSHttpHandlerResult.Detached == rc) break;
-                            
-                        if (OSHttpHandlerResult.Handled != rc)
-                        {
-                            // something went wrong
-                            throw new Exception(String.Format("[{0}] got unexpected OSHttpHandlerResult {1}", EngineID, rc));
-                        }
+
+                        // Handled: handler has processed the request
+                        if (OSHttpHandlerResult.Done == rc) break;
                             
-                        // Handled: clean up now
-                        req.HttpRequest.AddHeader("keep-alive", "false");
+                        // hmm, something went wrong
+                        throw new Exception(String.Format("[{0}] got unexpected OSHttpHandlerResult {1}", EngineID, rc));
+                    }
+                    
+                    if (OSHttpHandlerResult.Unprocessed == rc)
+                    {
+                        _log.InfoFormat("[{0}] OSHttpHandler: no handler registered for {1}", EngineID, req);
+
+                        // set up response header
+                        OSHttpResponse resp = new OSHttpResponse(req);
+                        resp.StatusCode = (int)OSHttpStatusCode.ClientErrorNotFound;
+                        resp.StatusDescription = String.Format("no handler on call for {0}", req);
+                        resp.ContentType = "text/html";
+
+                        // add explanatory message
+                        StreamWriter body = new StreamWriter(resp.Body);
+                        body.WriteLine("<html>");
+                        body.WriteLine("<header><title>Ooops...</title><header>");
+                        body.WriteLine(String.Format("<body><p>{0}</p></body>", resp.StatusDescription));
+                        body.WriteLine("</html>");
+                        body.Flush();
 
-                        break;
+                        // and ship it back
+                        resp.HttpResponse.Send();
                     }
-                        
                 }
                 catch (Exception e)
                 {
@@ -199,17 +213,37 @@ namespace OpenSim.Framework.Servers
                     NameValueCollection headers = req.HttpRequest.Headers;
                     foreach (string tag in headerRegexs.Keys)
                     {
-                        if (null != headers[tag])
+                        // do we have a header "tag"?
+                        if (null == headers[tag])
                         {
-                            Match hm = headerRegexs[tag].Match(headers[tag]);
-                            if (hm.Success) {
-                                headersMatch++;
-                                continue;
-                            }
+                            // no: remove the handler if it was added
+                            // earlier and on to the next one
+                            scoredHandlers.Remove(h);
+                            break;
                         }
-
-                        scoredHandlers.Remove(h);
-                        break;
+                            
+                        // does the content of header "tag" match
+                        // the supplied regex?
+                        Match hm = headerRegexs[tag].Match(headers[tag]);
+                        if (!hm.Success) {
+                            // no: remove the handler if it was added
+                            // earlier and on to the next one
+                            scoredHandlers.Remove(h);
+                            break;
+                        }
+                        
+                        // if we are looking at the "content-type" tag,
+                        // check wether h has a ContentTypeChecker and
+                        // invoke it if it has
+                        if ((null != h.ContentTypeChecker) && !h.ContentTypeChecker(req))
+                        {
+                            scoredHandlers.Remove(h);
+                            break;
+                        }
+                        
+                        // ok: header matches
+                        headersMatch++;
+                        continue;
                     }
                     // check whether h got kicked out
                     if (!scoredHandlers.ContainsKey(h)) continue;
diff --git a/OpenSim/Framework/Servers/OSHttpResponse.cs b/OpenSim/Framework/Servers/OSHttpResponse.cs
index e1ab005..352c6f6 100644
--- a/OpenSim/Framework/Servers/OSHttpResponse.cs
+++ b/OpenSim/Framework/Servers/OSHttpResponse.cs
@@ -25,141 +25,346 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using System;
 using System.Collections;
 using System.IO;
 using System.Net;
 using System.Text;
+using HttpServer;
 
 namespace OpenSim.Framework.Servers
 {
+    /// <summary>
+    /// OSHttpResponse is the OpenSim representation of an HTTP
+    /// response.
+    /// </summary>
+    /// <remarks>
+    /// OSHttpResponse is currently dual "homed" in that it support
+    /// both the .NET HttpListenerResponse and the HttpServer
+    /// HttpResponse (similar to OSHttpRequest); this duality is only
+    /// temporary and the .NET usage will disappear once the switch to
+    /// HttpServer is completed.
+    /// </remarks>
     public class OSHttpResponse
     {
-        private string _contentType;
-        private bool _contentTypeSet;
+
+        // property code below is a bit messy, will all resolve to
+        // harmony once we've completed the switch
+
+        /// <summary>
+        /// Content type property.
+        /// </summary>
+        /// <remarks>
+        /// Setting this property will also set IsContentTypeSet to
+        /// true. 
+        /// </remarks>
         public string ContentType
         {
-            get { return _contentType; }
+            get 
+            { 
+                return HttpServer ? _httpResponse.ContentType : _contentType; 
+            }
             set
             {
-                _contentType = value;
-                _contentTypeSet = true;
+                if (HttpServer)
+                {
+                    _httpResponse.ContentType = value;
+                }
+                else
+                {
+                    _contentType = value;
+                    _contentTypeSet = true;
+                }
             }
         }
+        private string _contentType;
+
+        /// <summary>
+        /// Boolean property indicating whether the content type
+        /// property actively has been set.
+        /// </summary>
+        /// <remarks>
+        /// IsContentTypeSet will go away together with .NET base.
+        /// </remarks>
         public bool IsContentTypeSet
         {
             get { return _contentTypeSet; }
         }
+        private bool _contentTypeSet;
 
-        private long _contentLength64;
-        public long ContentLength64
+
+        /// <summary>
+        /// Length of the body content; 0 if there is no body.
+        /// </summary>
+        public long ContentLength
         {
-            get { return _contentLength64; }
+            get 
+            { 
+                return HttpServer ?  _httpResponse.ContentLength : _contentLength;
+            }
             set
             {
-                _contentLength64 = value;
-                if (null != _resp) _resp.ContentLength64 = value;
+                if (HttpServer)
+                    _httpResponse.ContentLength = value;
+                else
+                    _contentLength = value;
             }
         }
+        private long _contentLength;
 
-        private Encoding _contentEncoding;
+        /// <summary>
+        /// Aliases for ContentLength.
+        /// </summary>
+        public long ContentLength64
+        {
+            get { return ContentLength; }
+            set { ContentLength = value; }
+        }
+
+        /// <summary>
+        /// Encoding of the body content.
+        /// </summary>
         public Encoding ContentEncoding
         {
-            get { return _contentEncoding; }
+            get { 
+                return HttpServer ? _httpResponse.Encoding : _contentEncoding; 
+            }
             set
             {
-                _contentEncoding = value;
-                if (null != _resp) _resp.ContentEncoding = value;
+                if (HttpServer)
+                    _httpResponse.Encoding = value;
+                else 
+                    _contentEncoding = value;
             }
         }
+        private Encoding _contentEncoding;
 
-        public WebHeaderCollection Headers;
-        // public CookieCollection Cookies;
+        /// <summary>
+        /// Headers of the response.
+        /// </summary>
+        public WebHeaderCollection Headers
+        {
+            get 
+            { 
+                return HttpServer ? null : _headers; 
+            }
+        }
+        private WebHeaderCollection _headers;
 
-        private bool _keepAlive;
+        /// <summary>
+        /// Get or set the keep alive property.
+        /// </summary>
         public bool KeepAlive
         {
-            get { return _keepAlive; }
+            get 
+            { 
+                if (HttpServer)
+                    return _httpResponse.Connection == ConnectionType.KeepAlive; 
+                else
+                    return _keepAlive;
+            }
             set
             {
-                _keepAlive = value;
-                if (null != _resp) _resp.KeepAlive = value;
+                if (HttpServer)
+                    _httpResponse.Connection = ConnectionType.KeepAlive;
+                else 
+                    _keepAlive = value;
             }
         }
+        private bool _keepAlive;
 
-        public Stream OutputStream;
+        /// <summary>
+        /// Return the output stream feeding the body.
+        /// </summary>
+        /// <remarks>
+        /// On its way out...
+        /// </remarks>
+        public Stream OutputStream
+        {
+            get 
+            { 
+                return HttpServer ? _httpResponse.Body : _outputStream;
+            }
+        }
+        private Stream _outputStream;
+
+
+        /// <summary>
+        /// Return the output stream feeding the body.
+        /// </summary>
+        public Stream Body
+        {
+            get 
+            { 
+                if (HttpServer)
+                    return _httpResponse.Body; 
+                throw new Exception("[OSHttpResponse] mixed .NET and HttpServer access");
+            }
+        }
 
-        private string _redirectLocation;
+        /// <summary>
+        /// Set a redirct location.
+        /// </summary>
         public string RedirectLocation
         {
-            get { return _redirectLocation; }
+            // get { return _redirectLocation; }
             set
             {
-                _redirectLocation = value;
-                if (null != _resp) _resp.RedirectLocation = value;
+                if (HttpServer)
+                    _httpResponse.Redirect(value);
+                // else
+                //     _redirectLocation = value;
             }
         }
+        // private string _redirectLocation;
 
-        private bool _sendChunked;
+
+        
+        /// <summary>
+        /// Chunk transfers.
+        /// </summary>
         public bool SendChunked
         {
-            get { return _sendChunked; }
+            get 
+            { 
+                return HttpServer ? _httpResponse.Chunked :_sendChunked; 
+            }
+
             set
             {
-                _sendChunked = value;
-                if (null != _resp) _resp.SendChunked = value;
+                if (HttpServer)
+                    _httpResponse.Chunked = value;
+                else
+                    _sendChunked = value;
             }
         }
+        private bool _sendChunked;
 
-        private int _statusCode;
+
+        /// <summary>
+        /// HTTP status code.
+        /// </summary>
         public int StatusCode
         {
-            get { return _statusCode; }
+            get 
+            { 
+                return HttpServer ? (int)_httpResponse.Status : _statusCode; 
+            }
+
             set
             {
-                _statusCode = value;
-                if (null != _resp) _resp.StatusCode = value;
+                if (HttpServer)
+                    _httpResponse.Status = (HttpStatusCode)value;
+                else
+                    _statusCode = value;
             }
         }
+        private int _statusCode;
 
-        private string _statusDescription;
+
+        /// <summary>
+        /// HTTP status description.
+        /// </summary>
         public string StatusDescription
         {
-            get { return _statusDescription; }
+            get 
+            { 
+                return HttpServer ? _httpResponse.Reason : _statusDescription; 
+            }
+
             set
             {
-                _statusDescription = value;
-                if (null != _resp) _resp.StatusDescription = value;
+                if (HttpServer)
+                    _httpResponse.Reason = value;
+                else
+                    _statusDescription = value;
             }
         }
+        private string _statusDescription;
 
-        private HttpListenerResponse _resp;
+        private HttpResponse _httpResponse;
+
+        internal bool HttpServer
+        {
+            get { return null != _httpResponse; }
+        }
+
+        internal HttpResponse HttpResponse
+        {
+            get { return _httpResponse; }
+        }
 
         public OSHttpResponse()
         {
         }
 
+        /// <summary>
+        /// Instantiate an OSHttpResponse object based on an
+        /// underlying .NET HttpListenerResponse.
+        /// </summary>
+        /// <remarks>
+        /// Almost deprecated; will go west to make once HttpServer
+        /// base takes over.
+        /// </remarks>
         public OSHttpResponse(HttpListenerResponse resp)
         {
-            ContentEncoding = resp.ContentEncoding;
-            ContentLength64 = resp.ContentLength64;
+            _contentEncoding = resp.ContentEncoding;
+            _contentLength = resp.ContentLength64;
             _contentType = resp.ContentType;
-            Headers = resp.Headers;
-            // Cookies = resp.Cookies;
-            KeepAlive = resp.KeepAlive;
-            OutputStream = resp.OutputStream;
-            RedirectLocation = resp.RedirectLocation;
-            SendChunked = resp.SendChunked;
-            StatusCode = resp.StatusCode;
-            StatusDescription = resp.StatusDescription;
+            _headers = resp.Headers;
+            // _cookies = resp.Cookies;
+            _keepAlive = resp.KeepAlive;
+            _outputStream = resp.OutputStream;
+            // _redirectLocation = resp.RedirectLocation;
+            _sendChunked = resp.SendChunked;
+            _statusCode = resp.StatusCode;
+            _statusDescription = resp.StatusDescription;
 
             _contentTypeSet = false;
 
-            _resp = resp;
+            // _resp = resp;
         }
 
+        /// <summary>
+        /// Instantiate an OSHttpResponse object from an OSHttpRequest
+        /// object.
+        /// </summary
+        /// <param name="req">Incoming OSHttpRequest to which we are
+        /// replying</param> 
+        public OSHttpResponse(OSHttpRequest req)
+        {
+            _httpResponse = new HttpResponse(req.HttpClientContext, req.HttpRequest);
+        }
+
+        /// <summary>
+        /// Add a header field and content to the response.
+        /// </summary>
+        /// <param name="key">string containing the header field
+        /// name</param>
+        /// <param name="value">string containing the header field
+        /// value</param> 
         public void AddHeader(string key, string value)
         {
-            Headers.Add(key, value);
+            if (HttpServer)
+                _headers.Add(key, value);
+            else
+                _httpResponse.AddHeader(key, value);
+        }
+
+        /// <summary>
+        /// Send the response back to the remote client
+        /// </summary>
+        public void Send()
+        {
+            if (HttpServer)
+            {
+                _httpResponse.Body.Flush();
+                _httpResponse.Send();
+            } 
+            else 
+            {
+                OutputStream.Close();
+            }
         }
     }
 }
diff --git a/OpenSim/Framework/Servers/OSHttpXmlRpcHandler.cs b/OpenSim/Framework/Servers/OSHttpXmlRpcHandler.cs
new file mode 100644
index 0000000..4205547
--- /dev/null
+++ b/OpenSim/Framework/Servers/OSHttpXmlRpcHandler.cs
@@ -0,0 +1,222 @@
+/*
+ * 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.Net;
+using System.Reflection;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Xml;
+using log4net;
+using Nwc.XmlRpc;
+
+namespace OpenSim.Framework.Servers
+{
+    public delegate XmlRpcResponse OSHttpXmlRpcProcessor(XmlRpcRequest request);
+
+    public class OSHttpXmlRpcHandler: OSHttpHandler
+    {
+        private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        /// <summary>
+        /// Regular expression used to match against path of incoming
+        /// HTTP request. If you want to match any string either use
+        /// '.*' or null. To match for the emtpy string use '^$'
+        /// </summary>
+        public Regex Path 
+        {
+            get { return _pathsRegex; }
+        }
+        private Regex _pathsRegex;
+
+        /// <summary>
+        /// Dictionary of (header name, regular expression) tuples,
+        /// allowing us to match on HTTP header fields.
+        /// </summary>
+        public Dictionary<string, Regex> Headers
+        { 
+            get { return _headers; }
+        }
+        private Dictionary<string, Regex> _headers;
+
+        /// <summary>
+        /// Regex to whitelist IP end points. A null value disables
+        /// checking of IP end points.
+        /// </summary>
+        /// <remarks>
+        /// This feature is currently not implemented as it requires
+        /// (trivial) changes to HttpServer.HttpListener that have not
+        /// been implemented.
+        /// </remarks>
+        public Regex IPEndPointWhitelist
+        {
+            get { return _ipEndPointRegex; }
+        }
+        private Regex _ipEndPointRegex;
+
+        /// <summary>
+        /// An OSHttpHandler that matches on the "content-type" header can
+        /// supply an OSHttpContentTypeChecker delegate which will be
+        /// invoked by the request matcher in OSHttpRequestPump.
+        /// </summary>
+        /// <returns>true if the handler is interested in the content;
+        /// false otherwise</returns>
+        public OSHttpContentTypeChecker ContentTypeChecker
+        { 
+            get 
+            { 
+                return delegate(OSHttpRequest req)
+                {
+                    XmlRpcRequest xmlRpcRequest = null;
+                    
+                    // check whether req is already reified
+                    // if not: reify (and post to whiteboard)
+                    try 
+                    {
+                        if (req.Whiteboard.ContainsKey("xmlrequest"))
+                        {
+                            xmlRpcRequest = req.Whiteboard["xmlrequest"] as XmlRpcRequest;
+                        }
+                        else 
+                        {
+                            StreamReader body = new StreamReader(req.InputStream);
+                            string requestBody = body.ReadToEnd();
+                            xmlRpcRequest = (XmlRpcRequest)(new XmlRpcRequestDeserializer()).Deserialize(requestBody);
+                            req.Whiteboard["xmlrequest"] = xmlRpcRequest;
+                        }
+                    }
+                    catch (XmlException)
+                    {
+                        _log.ErrorFormat("[OSHttpXmlRpcHandler] failed to deserialize XmlRpcRequest from {0}", req.ToString());
+                        return false;
+                    }
+
+                    // check against methodName
+                    if ((null != xmlRpcRequest) 
+                        && !String.IsNullOrEmpty(xmlRpcRequest.MethodName) 
+                        && xmlRpcRequest.MethodName == _methodName)
+                    {
+                        _log.DebugFormat("[OSHttpXmlRpcHandler] located handler {0} for {1}", _methodName, req.ToString());
+                        return true;
+                    }
+                    
+                    return false;
+                };
+            }
+        }
+
+        // contains handler for processing XmlRpc Request
+        private OSHttpXmlRpcProcessor _handler;
+        
+        // contains XmlRpc method name
+        private string _methodName;
+
+
+        /// <summary>
+        /// Instantiate an XmlRpc handler.
+        /// </summary>
+        /// <param name="handler">OSHttpXmlRpcProcessor
+        /// delegate</param>
+        /// <param name="methodName">XmlRpc method name</param>
+        /// <param name="path">XmlRpc path prefix (regular expression)</param>
+        /// <param name="headers">Dictionary with header names and
+        /// regular expressions to match content of headers</param>
+        /// <param name="whitelist">IP whitelist of remote end points
+        /// to accept (regular expression)</param>
+        /// <remarks>
+        /// Except for handler and methodName, all other parameters
+        /// can be null, in which case they are not taken into account
+        /// when the handler is being looked up.
+        /// </remarks>
+        public OSHttpXmlRpcHandler(OSHttpXmlRpcProcessor handler, string methodName, Regex path, 
+                                   Dictionary<string, Regex> headers, Regex whitelist)
+        {
+            _handler = handler;
+            _pathsRegex = path;
+            _methodName = methodName;
+
+            if (null == _headers) _headers = new Dictionary<string, Regex>();
+            _headers.Add("content-type", new Regex(@"^(text|application)/xml", RegexOptions.IgnoreCase | 
+                                                   RegexOptions.Compiled));
+
+            _ipEndPointRegex = whitelist;
+        }
+
+
+        /// <summary>
+        /// Instantiate an XmlRpc handler.
+        /// </summary>
+        /// <param name="handler">OSHttpXmlRpcProcessor
+        /// delegate</param>
+        /// <param name="methodName">XmlRpc method name</param>
+        public OSHttpXmlRpcHandler(OSHttpXmlRpcProcessor handler, string methodName)
+            : this(handler, methodName, null, null, null)
+        {
+        }
+
+
+        /// <summary>
+        /// Invoked by OSHttpRequestPump.
+        /// </summary>
+        public OSHttpHandlerResult Process(OSHttpRequest request) 
+        {
+            XmlRpcResponse xmlRpcResponse;
+            string responseString;
+
+            OSHttpResponse resp = new OSHttpResponse(request);
+            
+            try 
+            {
+                // reified XmlRpcRequest must still be on the whiteboard
+                XmlRpcRequest xmlRpcRequest = request.Whiteboard["xmlrequest"] as XmlRpcRequest;
+                xmlRpcResponse = _handler(xmlRpcRequest);
+                responseString = XmlRpcResponseSerializer.Singleton.Serialize(xmlRpcResponse);
+                
+                resp.ContentType = "text/xml";
+                byte[] buffer = Encoding.UTF8.GetBytes(responseString);
+
+                resp.SendChunked = false;
+                resp.ContentLength = buffer.Length;
+                resp.ContentEncoding = Encoding.UTF8;
+
+                resp.Body.Write(buffer, 0, buffer.Length);
+                resp.Body.Flush();
+
+                resp.Send();
+
+            }
+            catch (Exception ex)
+            {
+                _log.WarnFormat("[OSHttpXmlRpcHandler]: Error: {0}", ex.Message);
+                return OSHttpHandlerResult.Pass;
+            }
+            return OSHttpHandlerResult.Done;
+        }
+    }
+}
\ No newline at end of file
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