public async Task <Result> CheckForUpdatesAsync()
{
try
{
this.Show();
#if DEBUG
const bool SkipUpdate = true;
#else
const bool SkipUpdate = false;
#endif
var curProcess = Process.GetCurrentProcess();
var processFilePath = curProcess.MainModule?.FileName;
var processFileOldPath = $"{processFilePath}.old";
if (string.IsNullOrEmpty(processFilePath))
{
MessageBox.Show(this,
"Fatal error...could not locate the running program on the file system.",
"Update Failed",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return(Result.Failed);
}
var otherProcesses = Process.GetProcessesByName(curProcess.ProcessName)
.Where(p => p.Id != curProcess.Id);
foreach (var process in otherProcesses)
{
process.WaitForExit(3000);
process.Kill();
}
if (File.Exists(processFileOldPath))
{
File.Delete(processFileOldPath);
}
using var web = new WebClient();
var localHash = CryptoUtility.CalculateFileMd5(processFilePath);
var remoteHash = await web.DownloadStringTaskAsync(this.remoteMd5Url);
// ReSharper disable once RedundantLogicalConditionalExpressionOperand
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
if (SkipUpdate || localHash == remoteHash)
{
return(Result.NoUpdateNeeded);
}
this.lbStatus.Text = "Updating program...";
this.pbDownload.Style = ProgressBarStyle.Continuous;
web.DownloadProgressChanged += (o, e) => this.Invoke(new Action(() => {
var dlSize = e.BytesReceived.Bytes();
var totalSize = e.TotalBytesToReceive.Bytes();
this.lbProgress.Text = $"Downloading updates... {dlSize.ToString("0.##")} / {totalSize.ToString("0.##")} ({e.ProgressPercentage}%)";
this.pbDownload.Value = e.ProgressPercentage;
}));
var updateFilePath = Path.Combine(Path.GetTempPath(), "MinecraftLauncher.exe");
if (File.Exists(updateFilePath))
{
File.Delete(updateFilePath);
}
await web.DownloadFileWrappedAsync(this.remoteFileUrl, updateFilePath);
this.lbStatus.Text = "Installing updates...";
this.pbDownload.Style = ProgressBarStyle.Marquee;
File.Move(processFilePath, processFileOldPath);
File.Move(updateFilePath, processFilePath);
var newLocalHash = CryptoUtility.CalculateFileMd5(processFilePath);
if (newLocalHash != remoteHash)
{
MessageBox.Show(this,
"Checksum mismatch! The update file is invalid. Update failed.",
"Update Failed",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
File.Delete(processFilePath);
File.Move(processFileOldPath, processFilePath);
return(Result.Failed);
}
MessageBox.Show(this,
"Update complete! Click OK to restart the program and apply the update.",
"Update Complete",
MessageBoxButtons.OK,
MessageBoxIcon.Information);
Process.Start(new ProcessStartInfo {
FileName = processFilePath,
UseShellExecute = true,
});
return(Result.NeedsRestart);
}
catch (Exception ex)
{
Console.WriteLine("Exception in updater:");
Console.WriteLine(ex);
throw;
}
finally
{
this.Close();
}
}