code.grnet.gr Git - pithos-ms-client/blob - trunk/NetSparkle/NetSparkleAppCast.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Linq;
   4 using System.Text;
   5 using System.IO;
   6 using System.Xml;
   7 using System.Net;
   8
   9 namespace AppLimit.NetSparkle
  10 {
  11     public class NetSparkleAppCast
  12     {
  13         private NetSparkleConfiguration _config;
  14         private String _castUrl;
  15
  16         private const String itemNode = "item";
  17         private const String enclosureNode = "enclosure";
  18         private const String releaseNotesLinkNode = "sparkle:releaseNotesLink";
  19         private const String versionAttribute = "sparkle:version";
  20         private const String dasSignature = "sparkle:dsaSignature";
  21         private const String urlAttribute = "url";
  22
  23         public NetSparkleAppCast(String castUrl, NetSparkleConfiguration config)
  24         {
  25             _config     = config;
  26             _castUrl    = castUrl;
  27         }
  28
  29         public NetSparkleAppCastItem GetLatestVersion()
  30         {
  31             NetSparkleAppCastItem latestVersion = null;
  32
  33             // build a http web request stream
  34             WebRequest request = HttpWebRequest.Create(_castUrl);
  35
  36             // request the cast and build the stream
  37             WebResponse response = request.GetResponse();
  38
  39             Stream inputstream = response.GetResponseStream();
  40
  41             NetSparkleAppCastItem currentItem = null;
  42
  43             XmlTextReader reader = new XmlTextReader(inputstream);
  44             while(reader.Read())
  45             {
  46                 if ( reader.NodeType == XmlNodeType.Element)
  47                 {
  48                     switch(reader.Name)
  49                     {
  50                         case itemNode:
  51                             {
  52                                 currentItem = new NetSparkleAppCastItem();
  53                                 break;
  54                             }
  55                         case releaseNotesLinkNode:
  56                             {
  57                                 currentItem.ReleaseNotesLink = reader.ReadString();
  58                                 currentItem.ReleaseNotesLink = currentItem.ReleaseNotesLink.Trim('\n');
  59                                 break;
  60                             }
  61                         case enclosureNode:
  62                             {
  63                                 currentItem.Version = reader.GetAttribute(versionAttribute);
  64                                 currentItem.DownloadLink = reader.GetAttribute(urlAttribute);
  65                                 currentItem.DSASignature = reader.GetAttribute(dasSignature);
  66
  67                                 break;
  68                             }
  69                     }
  70                 }
  71                 else if (reader.NodeType == XmlNodeType.EndElement)
  72                 {
  73                     switch (reader.Name)
  74                     {
  75                         case itemNode:
  76                             {
  77                                 if (latestVersion == null)
  78                                     latestVersion = currentItem;
  79                                 else if (currentItem.CompareTo(latestVersion) > 0 )
  80                                 {
  81                                         latestVersion = currentItem;
  82                                 }
  83                                 break;
  84                             }
  85                     }
  86                 }
  87             }
  88
  89             // add some other attributes
  90             latestVersion.AppName = _config.ApplicationName;
  91             latestVersion.AppVersionInstalled = _config.InstalledVersion;
  92
  93             // go ahead
  94             return latestVersion;
  95         }
  96
  97     }
  98 }