public string DownloadFile(Uri remoteLocation, string localFilename, int timeoutMilliseconds, bool showProgress, Request request) {
if (request == null) {
throw new ArgumentNullException("request");
}
if (remoteLocation == null) {
throw new ArgumentNullException("remoteLocation");
}
request.Debug("Calling 'WebDownloader::DownloadFile' '{0}','{1}','{2}','{3}'", remoteLocation, localFilename, timeoutMilliseconds, showProgress);
if (remoteLocation.Scheme.ToLowerInvariant() != "http" && remoteLocation.Scheme.ToLowerInvariant() != "https" && remoteLocation.Scheme.ToLowerInvariant() != "ftp") {
request.Error(ErrorCategory.InvalidResult, remoteLocation.ToString(), Constants.Messages.SchemeNotSupported, remoteLocation.Scheme);
return null;
}
if (localFilename == null) {
localFilename = "downloadedFile.tmp".GenerateTemporaryFilename();
}
localFilename = Path.GetFullPath(localFilename);
// did the caller pass us a directory name?
if (Directory.Exists(localFilename)) {
localFilename = Path.Combine(localFilename, "downloadedFile.tmp");
}
// make sure that the parent folder is created first.
var folder = Path.GetDirectoryName(localFilename);
if (!Directory.Exists(folder)) {
Directory.CreateDirectory(folder);
}
// clobber an existing file if it's already there.
// todo: in the future, we could check the md5 of the file and if the remote server supports it
// todo: we could skip the download.
if (File.Exists(localFilename)) {
localFilename.TryHardToDelete();
}
// setup the progress tracker if the caller wanted one.
int pid = 0;
if (showProgress) {
pid = request.StartProgress(0, "Downloading '{0}'", remoteLocation);
}
#if CORECLR
var task = Download(remoteLocation, localFilename, showProgress, request, pid);
task.Wait(timeoutMilliseconds);
if (!task.IsCompleted)
{
request.Warning(Constants.Status.TimedOut);
request.Debug("Timed out downloading '{0}'", remoteLocation.AbsoluteUri);
}
#else
var webClient = new WebClient();
webClient.Headers.Add("user-agent", "chocolatey command line");
var done = new ManualResetEvent(false);
webClient.DownloadFileCompleted += (sender, args) => {
if (args.Cancelled || args.Error != null) {
localFilename = null;
}
done.Set();
};
var lastPercent = 0;
if (showProgress) {
webClient.DownloadProgressChanged += (sender, args) => {
// Progress(requestObject, 2, (int)percent, "Downloading {0} of {1} bytes", args.BytesReceived, args.TotalBytesToReceive);
var percent = (int)((args.BytesReceived*100)/args.TotalBytesToReceive);
if (percent > lastPercent) {
lastPercent = percent;
request.Progress(pid, (int)((args.BytesReceived*100)/args.TotalBytesToReceive), "To {0}", localFilename);
}
};
}
// start the download
webClient.DownloadFileAsync(remoteLocation, localFilename);
// wait for the completion
if (timeoutMilliseconds > 0) {
if (!done.WaitOne(timeoutMilliseconds))
{
webClient.CancelAsync();
request.Warning(Constants.Status.TimedOut);
request.Debug("Timed out downloading '{0}'", remoteLocation.AbsoluteUri);
return null;
}
} else {
// wait until it completes or fails on it's own
done.WaitOne();
}
#endif
// if we don't have the file by this point, we've failed.
if (localFilename == null || !File.Exists(localFilename)) {
request.CompleteProgress(pid, false);
request.Error(ErrorCategory.InvalidResult, remoteLocation.ToString(), Constants.Messages.UnableToDownload, remoteLocation.ToString(), localFilename);
return null;
}
if (showProgress) {
request.CompleteProgress(pid, true);
}
return localFilename;
}