private async Task AcknowledgeMessageAsync(
OpenVaspPayload payload,
string symKey,
string asymKey,
string returnTopic = null)
{
var envelopeId = Guid.NewGuid().ToString("N");
var ackPayload = new OpenVaspPayload(
Instruction.Ack,
_vaspId, // receiver becomes a sender
payload.ConnectionId,
envelopeId)
{
EnvelopeAck = payload.EnvelopeId
};
var ackEnvelope = new MessageEnvelope
{
Topic = returnTopic ?? payload.ReturnTopic,
EncryptionKey = symKey ?? asymKey,
EncryptionType = symKey != null ? EncryptionType.Symmetric : EncryptionType.Asymmetric,
};
await _outboundEnvelopeService.AcknowledgeAsync(ackEnvelope, ackPayload.ToString());
_logger?.LogInformation(
$"Sent ACK to {payload.Instruction} with topic {ackEnvelope.Topic} for connection {payload.ConnectionId} from {_vaspId} to {payload.SenderVaspId}");
}
public async Task SendAsync(string connectionId, string message, Instruction instruction, string receiverVaspId)
{
var connection = _connections[connectionId];
var receiverVaspCode = (receiverVaspId ?? connection.CounterPartyVaspId).Substring(4, 8);
var envelopeId = Guid.NewGuid().ToString("N");
var payload = new OpenVaspPayload(
instruction,
_vaspId,
connection.Id,
envelopeId)
{
ReturnTopic = connection.InboundTopic,
OvMessage = message
};
if (instruction == Instruction.Invite || instruction == Instruction.Accept || instruction == Instruction.Deny)
{
payload.EcdhPk = ECDH_Key.ImportKey(connection.PrivateKey).PublicKey;
}
var topic = connection.OutboundTopic ?? receiverVaspCode;
if (string.IsNullOrWhiteSpace(topic))
{
throw new InvalidOperationException($"Topic is empty for connection {connection.Id}");
}
var envelope = new MessageEnvelope
{
Topic = topic,
};
if (instruction == Instruction.Invite || instruction == Instruction.Close && string.IsNullOrWhiteSpace(connection.SymKeyId))
{
envelope.EncryptionType = EncryptionType.Asymmetric;
var vaspTransportKey = await _vaspCodesService.GetTransportKeyAsync(receiverVaspCode);
if (vaspTransportKey == null)
{
throw new InvalidOperationException($"Transport key for vasp code {receiverVaspCode} cannot be found during message sending");
}
envelope.EncryptionKey = vaspTransportKey.DecompressPublicKey().ToHex(true);
}
else if (instruction == Instruction.Accept || instruction == Instruction.Deny ||
instruction == Instruction.Close && connection.Status == ConnectionStatus.PartiallyActive)
{
envelope.EncryptionType = EncryptionType.Asymmetric;
envelope.EncryptionKey = connection.CounterPartyPublicKey.DecompressPublicKey().ToHex(true);
}
else
{
envelope.EncryptionType = EncryptionType.Symmetric;
envelope.EncryptionKey = connection.SymKeyId;
}
var outboundEnvelope = new OutboundEnvelope
{
Id = envelopeId,
ConnectionId = connectionId,
Envelope = envelope,
TotalResents = 0,
Payload = payload.ToString()
};
_openVaspPayloads[payload.EnvelopeId] = payload;
await _outboundEnvelopeService.SendEnvelopeAsync(outboundEnvelope, instruction != Instruction.Deny);
if (instruction == Instruction.Deny)
{
await DeactivateAsync(connectionId);
}
}
