private async Task <ISmtpCommand> GetCommandAsync(CancellationToken token)
{
string line = await _connection.ReadLineAsync(Encoding.UTF8, token);
_log.Verbose($"SMTP <- {line}");
if (line.Length < 4)
{
await this.SendReplyAsync(SmtpReplyCode.SyntaxError, "No command found", token);
return(null);
}
int spaceIndex = line.IndexOf(" ", StringComparison.Ordinal);
string command;
string arguments;
if (spaceIndex == -1)
{
command = line;
arguments = null;
}
else
{
command = line.Substring(0, spaceIndex).ToUpperInvariant();
arguments = line.Substring(spaceIndex + 1);
}
var commandExecutor = _context.ResolveOptionalKeyed <ISmtpCommand>(command);
if (commandExecutor == null)
{
await this.SendReplyAsync(SmtpReplyCode.SyntaxError, "Command not implemented", token);
return(null);
}
commandExecutor.Initialize(arguments);
return(commandExecutor);
}
public Task <byte[]> ReadAuthenticationFragmentAsync(CancellationToken cancellationToken)
{
return(_connection.ReadLineAsync(Encoding.ASCII, cancellationToken)
.ContinueWith(t => Convert.FromBase64String(t.Result), cancellationToken));
}
