public async Task SendMSearchResponseAsync(IMSearchResponse mSearchResponse, IMSearchRequest mSearchRequest)
{
var wait = new Random();
await Task.Delay(TimeSpan.FromMilliseconds(wait.Next(50, (int)mSearchRequest.MX.TotalMilliseconds)));
if (mSearchResponse.ResponseCastMethod != CastMethod.Unicast)
{
await _httpListener.SendOnMulticast(ComposeMSearchResponseDatagram(mSearchResponse));
}
if (int.TryParse(mSearchRequest.TCPPORT, out int tcpSpecifiedRemotePort))
{
await SendOnTcp(mSearchRequest.HostIp, tcpSpecifiedRemotePort,
ComposeMSearchResponseDatagram(mSearchResponse));
}
else
{
await SendOnTcp(mSearchRequest.HostIp, mSearchRequest.HostPort,
ComposeMSearchResponseDatagram(mSearchResponse));
}
}
private static byte[] ComposeMSearchResponseDatagram(IMSearchResponse response)
{
var stringBuilder = new StringBuilder();
stringBuilder.Append($"HTTP/1.1 {response.StatusCode} {response.ResponseReason}\r\n");
stringBuilder.Append($"CACHE-CONTROL: max-age = {response.CacheControl.TotalSeconds}\r\n");
stringBuilder.Append($"DATE: {DateTime.Now:r}\r\n");
stringBuilder.Append($"EXT:\r\n");
stringBuilder.Append($"LOCATION: {response.Location}\r\n");
stringBuilder.Append($"SERVER: " +
$"{response.Server.OperatingSystem}/{response.Server.OperatingSystemVersion}/" +
$" " +
$"UPnP/{response.Server.UpnpMajorVersion}.{response.Server.UpnpMinorVersion}" +
$" " +
$"{response.Server.ProductName}/{response.Server.ProductVersion}\r\n");
stringBuilder.Append($"ST: {response.ST}\r\n");
stringBuilder.Append($"USN: {response.USN}\r\n");
stringBuilder.Append($"BOOTID.UPNP.ORG: {response.BOOTID}\r\n");
HeaderHelper.AddOptionalHeader(stringBuilder, "CONFIGID.UPNP.ORG", response.CONFIGID);
HeaderHelper.AddOptionalHeader(stringBuilder, "SEARCHPORT.UPNP.ORG", response.SEARCHPORT);
HeaderHelper.AddOptionalHeader(stringBuilder, "SECURELOCATION.UPNP.ORG", response.SECURELOCATION);
// Adding additional vendor specific headers if they exist.
if (response.Headers?.Any() ?? false)
{
foreach (var header in response.Headers)
{
stringBuilder.Append($"{header.Key}: {header.Value}\r\n");
}
}
stringBuilder.Append("\r\n");
stringBuilder.Append("\r\n");
return(Encoding.UTF8.GetBytes(stringBuilder.ToString()));
}
public async Task MSearchResponse(IMSearchResponse mSearchResponse, IMSearchRequest mSearchRequest)
{
await SendMSearchResponseAsync(mSearchResponse, mSearchRequest);
}
