OSHttpXmlRpcHandler.cs

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 * See CONTRIBUTORS.TXT for a full list of copyright holders.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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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.HttpServer
{
    public delegate XmlRpcResponse OSHttpXmlRpcProcessor(XmlRpcRequest request);

    public class OSHttpXmlRpcHandler: OSHttpHandler
    {
        private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        protected bool XmlRpcMethodMatch(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 XmlRpcMethod _handler;

        // contains XmlRpc method name
        private string _methodName;


        public OSHttpXmlRpcHandler(XmlRpcMethod handler, string methodName, Regex path,
                                   Dictionary<string, Regex> headers, Regex whitelist)
            : base(new Regex(@"^POST$", RegexOptions.IgnoreCase | RegexOptions.Compiled), path, null, headers,
                   new Regex(@"^(text|application)/xml", RegexOptions.IgnoreCase | RegexOptions.Compiled),
                   whitelist)
        {
            _handler = handler;
            _methodName = methodName;
        }


        public OSHttpXmlRpcHandler(XmlRpcMethod handler, string methodName)
            : this(handler, methodName, null, null, null)
        {
        }


        public override OSHttpHandlerResult Process(OSHttpRequest request)
        {
            XmlRpcResponse xmlRpcResponse;
            string responseString;

            // check whether we are interested in this request
            if (!XmlRpcMethodMatch(request)) return OSHttpHandlerResult.Pass;


            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;
        }
    }
}