public async Task RefreshUpdateInfo(UpdateCheckFrequency frequency)
{
if (!CheckUpdateNeeded(frequency))
{
return;
}
LastCheckError = null;
using (HttpClient client = new HttpClient())
{
client.DefaultRequestHeaders.Add("Cache-Control", "no-cache");
client.DefaultRequestHeaders.UserAgent.TryParseAdd(UserAgent);
UriBuilder uriBuilder = new UriBuilder(settings.UpdateSource + versionFile);
try
{
string versions = await client.GetStringAsync(uriBuilder.Uri).ConfigureAwait(false);
File.WriteAllText(VersionFile, versions);
channels = ResolveUpdateChannels();
}
catch (HttpRequestException httpException)
{
Trace.WriteLine(httpException);
LastCheckError = httpException;
}
}
}
public UpdateManager(UserSettings settings)
{
this.settings = settings ?? throw new ArgumentNullException(nameof(settings));
channels = ResolveUpdateChannels();
// Check for elevation to update; elevation is needed if the update writes failed and the user is NOT an
// Administrator. Weird cases (like no permissions on the directory for anyone) are not handled.
if (!CheckUpdateWrites())
{
WindowsIdentity identity = WindowsIdentity.GetCurrent();
WindowsPrincipal principal = new WindowsPrincipal(identity);
UpdaterNeedsElevation = !principal.IsInRole(WindowsBuiltInRole.Administrator);
}
}
