public bool IsValid(string path, string sha256)
{
if (string.IsNullOrWhiteSpace(sha256))
{
return(false);
}
if (!_fileSystem.FileExists(path))
{
_logger.Debug("No existing download was found");
return(false);
}
try
{
_checksumService.ValidateHash(path, sha256);
_logger.Debug($"Installer is already downloaded: {path}");
return(true);
}
catch (ChecksumVerificationException)
{
_logger.Warn("Checksum verification failed. ignoring cache.");
}
return(false);
}
private async Task <string> TransferFile(string source, string destinationFolder, string sha256)
{
_hub.Publish(new FileTransferStartedEvent(source, destinationFolder));
_logger.Debug($"Transferring file from {source} to {destinationFolder}");
var client = GetClient(source);
var fileName = await client.GetFileName(source);
var destinationPath = Path.Combine(destinationFolder, fileName);
if (_transferCacheService.IsValid(destinationPath, sha256))
{
_logger.Info("Skipping download. Using already downloaded file.");
}
else
{
var progressCallback = new Action <ProgressUpdatedEvent>(p => _hub.Publish(p));
Console.WriteLine();
_logger.Info($"Downloading installer from {source}");
await client.TransferFile(source, destinationPath, progressCallback);
_logger.Debug($"Installer downloaded to {destinationPath}");
if (sha256 == null)
{
_logger.Debug("No hash provided. skipping checksum validation");
}
else
{
_checksumService.ValidateHash(destinationPath, sha256);
}
}
_hub.Publish(new FileTransferCompletedEvent(source, destinationFolder));
return(destinationPath);
}
