/// <summary>
/// Opens a previous application feed and populates default information from it.
/// </summary>
/// <param name="feedUrl">Url to feed.</param>
public void OpenPrevious(Uri feedUrl)
{
string localFeedPath = null;
bool download = false;
if (feedUrl.Scheme == Uri.UriSchemeHttp || feedUrl.Scheme == Uri.UriSchemeHttps)
{
localFeedPath = Path.GetTempFileName();
download = true;
}
else if (feedUrl.Scheme == Uri.UriSchemeFile)
{
localFeedPath = feedUrl.LocalPath;
}
else
{
throw new ArgumentException("Only http:, https:, and file: protocols are supported.", "feedUrl");
}
if (download)
{
this.DownloadUrl(feedUrl, localFeedPath);
}
this.previousFeed = new XmlDocument();
this.previousAppItem = null;
XmlNamespaceManager namespaces = new XmlNamespaceManager(this.previousFeed.NameTable);
namespaces.AddNamespace("as", "http://appsyndication.org/schemas/appsyn");
this.previousFeed.Load(localFeedPath);
// Get the application id, if there isn't one this isn't a valid application feed.
XmlNode node = this.previousFeed.SelectSingleNode("rss/channel/as:application", namespaces);
if (node == null)
{
throw new ApplicationException("Did not open a valid Application Feed");
}
this.feedId = new Guid(node.InnerText);
// Get the title and description from the previous feed, if present.
node = this.previousFeed.SelectSingleNode("rss/channel/title");
if (node != null)
{
this.title = node.InnerText;
}
node = this.previousFeed.SelectSingleNode("rss/channel/description");
if (node != null)
{
this.description = node.InnerText;
}
// Find the previous app.
XmlNodeList items = this.previousFeed.SelectNodes("rss/channel/item");
foreach (XmlNode item in items)
{
// Get the application's version from the feed. If there is
// no version, then this isn't an application feed.
node = item.SelectSingleNode("as:version", namespaces);
if (node == null)
{
continue;
}
// If this item's application version isn't higher, skip proccessing it.
Version appVersion = new Version(node.InnerText);
if (this.previousAppItem != null && appVersion < this.previousAppItem.Version)
{
continue;
}
// Get the URL to the application. If there is no URL, then this
// isn't a valid application feed.
node = item.SelectSingleNode("enclosure/@url");
if (node == null)
{
continue;
}
this.previousAppItem = new ApplicationFeedItem();
this.previousAppItem.Version = appVersion;
try
{
this.previousAppItem.Url = new Uri(node.Value);
}
catch (UriFormatException)
{
this.previousAppItem.Url = new Uri(feedUrl, node.Value);
}
// Get the optional application id, if there is one.
node = item.SelectSingleNode("as:application", namespaces);
if (node != null)
{
this.previousAppItem.Id = node.InnerText;
}
}
}
/// <summary>
/// Opens a previous application feed and populates default information from it.
/// </summary>
/// <param name="feedUrl">Url to feed.</param>
public void OpenPrevious(Uri feedUrl)
{
string localFeedPath = null;
bool download = false;
if (feedUrl.Scheme == Uri.UriSchemeHttp || feedUrl.Scheme == Uri.UriSchemeHttps)
{
localFeedPath = Path.GetTempFileName();
download = true;
}
else if (feedUrl.Scheme == Uri.UriSchemeFile)
{
localFeedPath = feedUrl.LocalPath;
}
else
{
throw new ArgumentException("Only http:, https:, and file: protocols are supported.", "feedUrl");
}
if (download)
{
this.DownloadUrl(feedUrl, localFeedPath);
}
this.previousFeed = new XmlDocument();
this.previousAppItem = null;
XmlNamespaceManager namespaces = new XmlNamespaceManager(this.previousFeed.NameTable);
namespaces.AddNamespace("as", "http://appsyndication.org/schemas/appsyn");
this.previousFeed.Load(localFeedPath);
// Get the application id, if there isn't one this isn't a valid application feed.
XmlNode node = this.previousFeed.SelectSingleNode("rss/channel/as:application", namespaces);
if (node == null)
{
throw new ApplicationException("Did not open a valid Application Feed");
}
this.feedId = new Guid(node.InnerText);
// Get the title and description from the previous feed, if present.
node = this.previousFeed.SelectSingleNode("rss/channel/title");
if (node != null)
{
this.title = node.InnerText;
}
node = this.previousFeed.SelectSingleNode("rss/channel/description");
if (node != null)
{
this.description = node.InnerText;
}
// Find the previous app.
XmlNodeList items = this.previousFeed.SelectNodes("rss/channel/item");
foreach (XmlNode item in items)
{
// Get the application's version from the feed. If there is
// no version, then this isn't an application feed.
node = item.SelectSingleNode("as:version", namespaces);
if (node == null)
{
continue;
}
// If this item's application version isn't higher, skip proccessing it.
Version appVersion = new Version(node.InnerText);
if (this.previousAppItem != null && appVersion < this.previousAppItem.Version)
{
continue;
}
// Get the URL to the application. If there is no URL, then this
// isn't a valid application feed.
node = item.SelectSingleNode("enclosure/@url");
if (node == null)
{
continue;
}
this.previousAppItem = new ApplicationFeedItem();
this.previousAppItem.Version = appVersion;
try
{
this.previousAppItem.Url = new Uri(node.Value);
}
catch (UriFormatException)
{
this.previousAppItem.Url = new Uri(feedUrl, node.Value);
}
// Get the optional application id, if there is one.
node = item.SelectSingleNode("as:application", namespaces);
if (node != null)
{
this.previousAppItem.Id = node.InnerText;
}
}
}
