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 descriptionNode = "description";
  18         private const String enclosureNode = "enclosure";
  19         private const String releaseNotesLinkNode = "sparkle:releaseNotesLink";
  20         private const String versionAttribute = "sparkle:version";
  21         private const String dasSignature = "sparkle:dsaSignature";
  22         private const String urlAttribute = "url";
  23
  24         public NetSparkleAppCast(String castUrl, NetSparkleConfiguration config)
  25         {
  26             _config     = config;
  27             _castUrl    = castUrl;
  28         }
  29
  30         public NetSparkleAppCastItem GetLatestVersion()
  31         {
  32             NetSparkleAppCastItem latestVersion = null;
  33
  34             // build a http web request stream
  35             WebRequest request = HttpWebRequest.Create(_castUrl);
  36
  37             // request the cast and build the stream
  38             WebResponse response = request.GetResponse();
  39
  40             Stream inputstream = response.GetResponseStream();
  41
  42             NetSparkleAppCastItem currentItem = null;
  43
  44             XmlTextReader reader = new XmlTextReader(inputstream);
  45             while(reader.Read())
  46             {
  47                 if ( reader.NodeType == XmlNodeType.Element)
  48                 {
  49                     switch (reader.Name)
  50                     {
  51                         case itemNode:
  52                             {
  53                                 currentItem = new NetSparkleAppCastItem();
  54                                 break;
  55                             }
  56 /*
  57                         case descriptionNode:
  58                             {
  59                                 if (currentItem != null)
  60                                 {
  61                                     currentItem.Summary = reader.ReadElementContentAsString();
  62                                 }
  63                                 break;
  64                             }
  65 */
  66                         case releaseNotesLinkNode:
  67                             {
  68                                 currentItem.ReleaseNotesLink = reader.ReadString();
  69                                 currentItem.ReleaseNotesLink = currentItem.ReleaseNotesLink.Trim('\n');
  70                                 break;
  71                             }
  72                         case enclosureNode:
  73                             {
  74                                 currentItem.Version = reader.GetAttribute(versionAttribute);
  75                                 currentItem.DownloadLink = reader.GetAttribute(urlAttribute);
  76                                 currentItem.DSASignature = reader.GetAttribute(dasSignature);
  77
  78                                 break;
  79                             }
  80                     }
  81                 }
  82                 else if (reader.NodeType == XmlNodeType.EndElement)
  83                 {
  84                     switch (reader.Name)
  85                     {
  86                         case itemNode:
  87                             {
  88                                 if (latestVersion == null)
  89                                     latestVersion = currentItem;
  90                                 else if (currentItem.CompareTo(latestVersion) > 0 )
  91                                 {
  92                                         latestVersion = currentItem;
  93                                 }
  94                                 break;
  95                             }
  96                     }
  97                 }
  98             }
  99
 100             // add some other attributes
 101             latestVersion.AppName = _config.ApplicationName;
 102             latestVersion.AppVersionInstalled = _config.InstalledVersion;
 103
 104             // go ahead
 105             return latestVersion;
 106         }
 107
 108     }
 109 }