/// <inheritdoc/>
public override async Task<FtpResponse> Process(FtpCommand command, CancellationToken cancellationToken)
{
var argument = command.Argument;
var path = Data.Path.Clone();
IUnixFileSystemEntry targetEntry;
if (string.IsNullOrEmpty(argument))
{
targetEntry = path.Count == 0 ? Data.FileSystem.Root : path.Peek();
}
else
{
var foundEntry = await Data.FileSystem.SearchEntryAsync(path, argument, cancellationToken);
if (foundEntry?.Entry == null)
return new FtpResponse(550, "File system entry not found.");
targetEntry = foundEntry.Entry;
}
var dirEntry = targetEntry as IUnixDirectoryEntry;
var isDirEntry = dirEntry != null;
var listDir = string.Equals(command.Name, "MLSD", StringComparison.OrdinalIgnoreCase);
if (listDir && !isDirEntry)
return new FtpResponse(501, "Not a directory.");
await Connection.WriteAsync(new FtpResponse(150, "Opening data connection."), cancellationToken);
ITcpSocketClient responseSocket;
try
{
responseSocket = await Connection.CreateResponseSocket();
}
catch (Exception)
{
return new FtpResponse(425, "Can't open data connection.");
}
try
{
var formatter = new FactsListFormatter(Data.User, Data.FileSystem, path, Data.ActiveMlstFacts);
var encoding = Data.NlstEncoding ?? Connection.Encoding;
using (var stream = await Connection.CreateEncryptedStream(responseSocket.WriteStream))
{
using (var writer = new StreamWriter(stream, encoding, 4096, true)
{
NewLine = "\r\n",
})
{
if (listDir)
{
foreach (var line in formatter.GetPrefix(dirEntry))
{
Connection.Log?.Debug(line);
await writer.WriteLineAsync(line);
}
foreach (var entry in await Data.FileSystem.GetEntriesAsync(dirEntry, cancellationToken))
{
var line = formatter.Format(entry);
Connection.Log?.Debug(line);
await writer.WriteLineAsync(line);
}
foreach (var line in formatter.GetSuffix(dirEntry))
{
Connection.Log?.Debug(line);
await writer.WriteLineAsync(line);
}
}
else
{
var line = formatter.Format(targetEntry);
Connection.Log?.Debug(line);
await writer.WriteLineAsync(line);
}
await writer.FlushAsync();
}
await stream.FlushAsync(cancellationToken);
}
}
finally
{
responseSocket.Dispose();
}
// Use 250 when the connection stays open.
return new FtpResponse(226, "Closing data connection.");
}