public BeneficiarySession(
VaspContractInfo beneficiaryVaspContractInfo,
VaspInformation beneficiaryVasp,
string sessionId,
string counterpartyTopic,
string counterPartyPubSigningKey,
string sharedKey,
string privateSigningKey,
IWhisperRpc whisperRpc,
IVaspMessageHandler vaspMessageHandler,
ITransportClient transportClient,
ISignService signService)
: base(
beneficiaryVaspContractInfo,
beneficiaryVasp,
counterPartyPubSigningKey,
sharedKey,
privateSigningKey,
whisperRpc,
transportClient,
signService)
{
this.SessionId = sessionId;
this.CounterPartyTopic = counterpartyTopic;
this._vaspMessageHandler = vaspMessageHandler;
_messageHandlerResolverBuilder.AddHandler(typeof(TransferRequestMessage), new TransferRequestMessageHandler(
async(message, cancellationToken) =>
{
await _vaspMessageHandler.TransferRequestHandlerAsync(message, this);
}));
_messageHandlerResolverBuilder.AddHandler(typeof(TransferDispatchMessage), new TransferDispatchMessageHandler(
async(message, cancellationToken) =>
{
await _vaspMessageHandler.TransferDispatchHandlerAsync(message, this);
}));
_messageHandlerResolverBuilder.AddHandler(typeof(TerminationMessage),
new TerminationMessageHandler(async(message, token) =>
{
_hasReceivedTerminationMessage = true;
await TerminateAsync(message.GetMessageCode());
}));
}
/// <summary>
/// Run listener which would process incoming messages.
/// </summary>
/// <param name="messageHandler">Handler which authorizes originator's Vasp and processes Transfer Request and Transfer Dispatch Messages</param>
public void RunListener(IVaspMessageHandler messageHandler)
{
lock (_lock)
{
if (!_hasStartedListening)
{
_hasStartedListening = true;
var token = _cancellationTokenSource.Token;
var taskFactory = new TaskFactory(_cancellationTokenSource.Token);
this._listener = taskFactory.StartNew(async(_) =>
{
var privateKeyId = await _whisperRpc.RegisterKeyPairAsync(this._handshakeKey.PrivateKey);
string messageFilter =
await _whisperRpc.CreateMessageFilterAsync(topicHex: _vaspContractInfo.VaspCode.Code,
privateKeyId);
do
{
var sessionRequestMessages = await _transportClient.GetSessionMessagesAsync(messageFilter);
if (sessionRequestMessages != null &&
sessionRequestMessages.Count != 0)
{
foreach (var message in sessionRequestMessages)
{
var sessionRequestMessage = message.Message as SessionRequestMessage;
if (sessionRequestMessage == null)
{
continue;
}
var isAuthorized =
await messageHandler.AuthorizeSessionRequestAsync(sessionRequestMessage.VASP);
if (!isAuthorized)
{
continue;
}
var originatorVaspContractInfo =
await _ethereumRpc.GetVaspContractInfoAync(sessionRequestMessage.VASP
.VaspIdentity);
if (!_signService.VerifySign(message.Payload, message.Signature,
originatorVaspContractInfo.SigningKey))
{
continue;
}
var sharedSecret =
this._handshakeKey.GenerateSharedSecretHex(sessionRequestMessage.HandShake
.EcdhPubKey);
var session = new BeneficiarySession(
originatorVaspContractInfo,
this.VaspInfo,
sessionRequestMessage.Message.SessionId,
sessionRequestMessage.HandShake.TopicA,
originatorVaspContractInfo.SigningKey,
sharedSecret,
this._signatureKey,
this._whisperRpc,
messageHandler,
_transportClient,
_signService);
this.NotifySessionCreated(session);
session.OnSessionTermination += this.ProcessSessionTermination;
if (_beneficiarySessionsDict.TryAdd(session.SessionId, session))
{
await session.StartAsync();
}
else
{
await session.TerminateAsync(TerminationMessage.TerminationMessageCode
.SessionClosedTransferDeclinedByBeneficiaryVasp);
}
}
continue;
}
await Task.Delay(5000, token);
} while (!token.IsCancellationRequested);
}, token, TaskCreationOptions.LongRunning);
}
else
{
throw new Exception("You can start observation only once.");
}
}
}