Synnefo » Pithos MS Client

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Xml;

using System.Net;

namespace AppLimit.NetSparkle

{

    public class NetSparkleAppCast

    {

        private NetSparkleConfiguration _config;

        private String _castUrl;

        private const String itemNode = "item";

        private const String descriptionNode = "description";

        private const String enclosureNode = "enclosure";

        private const String releaseNotesLinkNode = "sparkle:releaseNotesLink";

        private const String versionAttribute = "sparkle:version";

        private const String dasSignature = "sparkle:dsaSignature";

        private const String urlAttribute = "url";

        public NetSparkleAppCast(String castUrl, NetSparkleConfiguration config)

        {

            _config     = config;

            _castUrl    = castUrl;

        }

        public NetSparkleAppCastItem GetLatestVersion()

        {

            NetSparkleAppCastItem latestVersion = null;

            // build a http web request stream

            WebRequest request = HttpWebRequest.Create(_castUrl);

            // request the cast and build the stream

            WebResponse response = request.GetResponse();

            Stream inputstream = response.GetResponseStream();

            NetSparkleAppCastItem currentItem = null;

            XmlTextReader reader = new XmlTextReader(inputstream);

            while(reader.Read())

            {

                if ( reader.NodeType == XmlNodeType.Element)

                {

                    switch (reader.Name)

                    {

                        case itemNode:

                            {

                                currentItem = new NetSparkleAppCastItem();

                                break;

                            }

/*

                        case descriptionNode:

                            {

                                if (currentItem != null)

                                {

                                    currentItem.Summary = reader.ReadElementContentAsString();

                                }

                                break;

                            }

*/

                        case releaseNotesLinkNode:

                            {

                                currentItem.ReleaseNotesLink = reader.ReadString();

                                currentItem.ReleaseNotesLink = currentItem.ReleaseNotesLink.Trim('\n');

                                break;

                            }

                        case enclosureNode:

                            {

                                currentItem.Version = reader.GetAttribute(versionAttribute);

                                var downloadLink = reader.GetAttribute(urlAttribute);

                                downloadLink = Environment.Is64BitOperatingSystem

                                    ? downloadLink.Replace(".x86.", ".x64.")

                                    : downloadLink.Replace(".x64.", ".x86.") ;

                                currentItem.DownloadLink = downloadLink;

                                currentItem.DSASignature = reader.GetAttribute(dasSignature);

                                break;

                            }

                    }

                }

                else if (reader.NodeType == XmlNodeType.EndElement)

                {

                    switch (reader.Name)

                    {

                        case itemNode:

                            {

                                if (latestVersion == null)

                                    latestVersion = currentItem;

                                else if (currentItem.CompareTo(latestVersion) > 0 )

                                {

                                        latestVersion = currentItem;

                                }

                                break;

                            }                            

                    }

                }                    

            }

            // add some other attributes

            latestVersion.AppName = _config.ApplicationName;

            latestVersion.AppVersionInstalled = _config.InstalledVersion;

            // go ahead

            return latestVersion;

        }

    }

}