/// <summary>
/// Returns a value indicating if a new update is available.
/// </summary>
/// <param name="url">The URL from which the update manifest can be downloaded.</param>
/// <param name="xmlPublicKey">The public key formatted as an XML document.</param>
/// <param name="currentVersion">The current version of the product.</param>
/// <returns>
/// <see langword="true" /> if a new version of the product is available; otherwise, <see langword="false" />.
/// </returns>
public UpdateInformation MostRecentUpdateOnRemoteServer(Uri url, string xmlPublicKey, Version currentVersion)
{
{
Lokad.Enforce.Argument(() => url);
Lokad.Enforce.Argument(() => xmlPublicKey);
Lokad.Enforce.Argument(() => currentVersion);
}
UpdateInformation info;
var manifestXml = HttpGetString(url);
if (string.IsNullOrWhiteSpace(manifestXml))
{
info = new UpdateInformation
{
LatestAvailableVersion = "0.0.0.0",
UpdateIsAvailableAndValid = false
};
return info;
}
// Create a new XML document.
var xmlDoc = new XmlDocument
{
PreserveWhitespace = true
};
// Load an XML file into the XmlDocument object.
xmlDoc.LoadXml(manifestXml);
// Verify the signature of the signed XML.
var cryptoProvider = new RSACryptoServiceProvider();
cryptoProvider.FromXmlString(xmlPublicKey);
if (!VerifyXml(xmlDoc, cryptoProvider))
{
info = new UpdateInformation
{
LatestAvailableVersion = "0.0.0.0",
UpdateIsAvailableAndValid = false
};
return info;
}
var s = new XmlSerializer(typeof(UpdateInformation));
using (var sr = new StringReader(manifestXml))
{
info = (UpdateInformation)s.Deserialize(new XmlTextReader(sr));
info.UpdateIsAvailableAndValid = new Version(info.LatestAvailableVersion) > currentVersion;
}
return info;
}
/// <summary>
/// Starts the download of the application update.
/// </summary>
/// <param name="information">The object that provides all the information about the new update.</param>
/// <returns>A task that handles the download process and returns a file object pointing to the newly downloaded file.</returns>
public Task<FileInfo> StartDownloadAsync(UpdateInformation information)
{
return Task<FileInfo>.Factory.StartNew(StartDownload, information, TaskCreationOptions.LongRunning);
}
private async Task<FileInfo> DownloadUpdateAsync(UpdateInformation info)
{
return await m_Updater.StartDownloadAsync(info);
}
