/// <summary>
/// This method checks if an update is required. During this process the appcast
/// will be downloaded and checked against the reference assembly. Ensure that
/// the calling process has access to the internet and read access to the
/// reference assembly. This method is also called from the background loops.
/// </summary>
/// <param name="config">the configuration</param>
/// <param name="latestVersion">returns the latest version</param>
/// <returns><c>true</c> if an update is required</returns>
public bool IsUpdateRequired(KryptonSparkleConfiguration config, out KryptonSparkleAppCastItem latestVersion)
{
// report
ReportDiagnosticMessage("Downloading and checking appcast");
// init the appcast
KryptonSparkleAppCast cast = new KryptonSparkleAppCast(_AppCastUrl, config);
// check if any updates are available
try
{
latestVersion = cast.GetLatestVersion();
}
catch (Exception e)
{
// show the exeception message
ReportDiagnosticMessage("Error during app cast download: " + e.Message);
// just null the version info
latestVersion = null;
}
if (latestVersion == null)
{
ReportDiagnosticMessage("No version information in app cast found");
return(false);
}
ReportDiagnosticMessage("Lastest version on the server is " + latestVersion.Version);
// set the last check time
ReportDiagnosticMessage("Touch the last check timestamp");
config.TouchCheckTime();
// check if the available update has to be skipped
if (latestVersion.Version.Equals(config.SkipThisVersion))
{
ReportDiagnosticMessage("Latest update has to be skipped (user decided to skip version " + config.SkipThisVersion + ")");
return(false);
}
// check if the version will be the same then the installed version
Version v1 = new Version(config.InstalledVersion);
Version v2 = new Version(latestVersion.Version);
if (v2 <= v1)
{
ReportDiagnosticMessage("Installed version is valid, no update needed (" + config.InstalledVersion + ")");
return(false);
}
// ok we need an update
return(true);
}
/// <summary>
/// Updates from appcast
/// </summary>
/// <param name="currentItem">the current (top-most) item in the app-cast</param>
private void Update(KryptonSparkleAppCastItem currentItem)
{
if (currentItem != null)
{
// show the update ui
if (EnableSilentMode)
{
InitDownloadAndInstallProcess(currentItem);
}
else
{
ShowUpdateNeededUI(currentItem);
}
}
}
/// <summary>
/// This method shows the update ui and allows to perform the
/// update process
/// </summary>
/// <param name="currentItem">the item to show the UI for</param>
public void ShowUpdateNeededUI(KryptonSparkleAppCastItem currentItem)
{
if (this.UserWindow == null)
{
// create the form
this.UserWindow = new KryptonSparkleForm(currentItem, ApplicationIcon, ApplicationWindowIcon);
}
this.UserWindow.CurrentItem = currentItem;
if (this.HideReleaseNotes)
{
this.UserWindow.HideReleaseNotes();
}
// clear if already set.
this.UserWindow.UserResponded -= new EventHandler(OnUserWindowUserResponded);
this.UserWindow.UserResponded += new EventHandler(OnUserWindowUserResponded);
this.UserWindow.Show();
}
/// <summary>
/// Starts the download process
/// </summary>
/// <param name="item">the appcast item to download</param>
private void InitDownloadAndInstallProcess(KryptonSparkleAppCastItem item)
{
// get the filename of the download lin
string[] segments = item.DownloadLink.Split('/');
string fileName = segments[segments.Length - 1];
// get temp path
_downloadTempFileName = Environment.ExpandEnvironmentVariables("%temp%\\" + fileName);
if (this.ProgressWindow == null)
{
this.ProgressWindow = new KryptonSparkleDownloadProgress(this, item, ApplicationIcon, ApplicationWindowIcon, EnableSilentMode);
}
else
{
this.ProgressWindow.InstallAndRelaunch -= new EventHandler(OnProgressWindowInstallAndRelaunch);
}
this.ProgressWindow.TempFileName = _downloadTempFileName;
this.ProgressWindow.InstallAndRelaunch += new EventHandler(OnProgressWindowInstallAndRelaunch);
// set up the download client
// start async download
if (_webDownloadClient != null)
{
_webDownloadClient.DownloadProgressChanged -= new DownloadProgressChangedEventHandler(this.ProgressWindow.OnClientDownloadProgressChanged);
_webDownloadClient.DownloadFileCompleted -= new AsyncCompletedEventHandler(OnWebDownloadClientDownloadFileCompleted);
_webDownloadClient = null;
}
_webDownloadClient = new WebClient
{
UseDefaultCredentials = true,
Proxy = { Credentials = CredentialCache.DefaultNetworkCredentials },
};
_webDownloadClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(this.ProgressWindow.OnClientDownloadProgressChanged);
_webDownloadClient.DownloadFileCompleted += new AsyncCompletedEventHandler(OnWebDownloadClientDownloadFileCompleted);
Uri url = new Uri(item.DownloadLink);
_webDownloadClient.DownloadFileAsync(url, _downloadTempFileName);
this.ProgressWindow.ShowDialog();
}
/// <summary>
/// Gets the latest version
/// </summary>
/// <returns>the AppCast item corresponding to the latest version</returns>
public KryptonSparkleAppCastItem GetLatestVersion()
{
KryptonSparkleAppCastItem latestVersion = null;
// build a http web request stream
WebRequest request = WebRequest.Create(_castUrl);
request.UseDefaultCredentials = true;
request.Proxy.Credentials = CredentialCache.DefaultNetworkCredentials;
// request the cast and build the stream
WebResponse response = request.GetResponse();
using (Stream inputstream = response.GetResponseStream())
{
KryptonSparkleAppCastItem currentItem = null;
if (inputstream == null)
{
return(null);
}
using (XmlTextReader reader = new XmlTextReader(inputstream))
{
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
switch (reader.Name)
{
case itemNode:
{
currentItem = new KryptonSparkleAppCastItem();
break;
}
case releaseNotesLinkNode:
{
if (currentItem != null)
{
currentItem.ReleaseNotesLink = reader.ReadString();
currentItem.ReleaseNotesLink = currentItem.ReleaseNotesLink.Trim('\n');
}
break;
}
case enclosureNode:
{
if (currentItem != null)
{
currentItem.Version = reader.GetAttribute(versionAttribute);
currentItem.DownloadLink = reader.GetAttribute(urlAttribute);
currentItem.DSASignature = reader.GetAttribute(dasSignature);
}
break;
}
}
break;
case XmlNodeType.EndElement:
switch (reader.Name)
{
case itemNode:
{
if (latestVersion == null)
{
latestVersion = currentItem;
}
else if (currentItem.CompareTo(latestVersion) > 0)
{
latestVersion = currentItem;
}
break;
}
}
break;
}
}
}
}
// add some other attributes
if (latestVersion != null)
{
latestVersion.AppName = _config.ApplicationName;
latestVersion.AppVersionInstalled = _config.InstalledVersion;
}
// go ahead
return(latestVersion);
}
