public static void WriteMessageStream(MemoryStream outStream, Message outMessage, string sessionKey, Aes aes, bool encrypt)
{
outMessage.ReplaceControlValue(Message.TimestampControlValueName, DateTime.Now.ToUniversalTime().ToString());
outMessage.ReplaceControlValue(Message.SessionKeyControlValueName, sessionKey);
if (encrypt)
{
aes.GenerateIV();
StreamUtilities.WriteStringToMemoryStream(outStream, aes.IV.Length + "!");
outStream.Write(aes.IV, 0, aes.IV.Length);
StreamUtilities.RunCryptoTransform(outMessage.Serialize(), aes.CreateEncryptor(), outStream, true);
}
else
{
outMessage.Serialize(outStream);
}
}
//private string timestampPrefix()
//{
// return DateTime.Now.ToString("yyyyMMddHHmmssFFFFFFF");
//}
private Message sendMessage(Message request, bool encryptMessage)
{
lock (request)
{
//TODO: learn how to use compile flags
//request.ToFile(timestampPrefix() + "_request.xml");
//calibrate
if (nextCalibrate == null || nextCalibrate < DateTime.Now)
{
request.ReplaceControlValue(Message.LibraryVersionControlValueName, InternalLibraryVersion.GetLibraryVersion().ToString());
nextCalibrate = DateTime.Now.Add(calibrateFrequency);
}
System.Net.WebClient webClient = new System.Net.WebClient();
if (accessKey != null)
webClient.QueryString[Message.AccessKeyHeaderName] = accessKey;
//set encryption is using...
Aes aes = null;
if (encryptionKey != null)
{
try
{
aes = StreamUtilities.GetAesCryptoTransform(encryptionKey, null);
}
catch (CryptographicException exception)
{
throw new Exceptions.CommunicationException("Encryption exception. Is the encryption key the right length?", exception);
}
}
//message is all ready to go.
MemoryStream outgoingStream = new MemoryStream();
Common.WriteMessageStream(outgoingStream, request, sessionKey, aes, encryptMessage);
//TODO: fix these last-minute converstions to/from arrays
byte[] responseBytes;
try
{
responseBytes = webClient.UploadData(url, outgoingStream.ToArray());
}
catch (System.Net.WebException exception)
{
throw new Exceptions.CommunicationException(exception.Message);
}
MemoryStream responseStream = StreamUtilities.ToMemoryStream(responseBytes);
Message response = responseStream.ToMessage(aes);
//update sessionKey
if (response.controlValues.ContainsKey(Message.NewSessionKeyControlValueName))
sessionKey = response.controlValues[Message.NewSessionKeyControlValueName];
//response.ToFile(timestampPrefix() + "_response.xml");
return response;
}
}
public static Message CreatePing()
{
var result = new Message();
result.ReplaceControlValue(ControlActionControlValueName, PingActionControlValueName);
return result;
}