/// <summary>
/// Combine creates a network-specific transaction from an unsigned transaction and an array of provided signatures.
/// The signed transaction returned from this method will be sent to the `/construction/submit` endpoint by the caller.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public JObject ConstructionCombine(ConstructionCombineRequest request)
{
NeoTransaction neoTx;
try
{
byte[] unsigned = request.UnsignedTransaction.HexToBytes();
TransactionType type = (TransactionType)unsigned[0];
switch (type)
{
case TransactionType.ClaimTransaction:
neoTx = new ClaimTransaction();
break;
case TransactionType.ContractTransaction:
neoTx = new ContractTransaction();
break;
case TransactionType.StateTransaction:
neoTx = new StateTransaction();
break;
case TransactionType.InvocationTransaction:
neoTx = new InvocationTransaction();
break;
default:
throw new ArgumentException();
}
using (MemoryStream ms = new MemoryStream(unsigned, false))
using (BinaryReader br = new BinaryReader(ms, Encoding.UTF8))
{
(neoTx as IVerifiable).DeserializeUnsigned(br);
}
}
catch (Exception)
{
return(Error.TX_DESERIALIZE_ERROR.ToJson());
}
if (neoTx.Witnesses != null && neoTx.Witnesses.Length > 0)
{
return(Error.TX_ALREADY_SIGNED.ToJson());
}
if (request.Signatures.Length == 0)
{
return(Error.NO_SIGNATURE.ToJson());
}
Witness witness;
if (request.Signatures.Length == 1) // single signed
{
witness = CreateSignatureWitness(request.Signatures[0]);
}
else
{
witness = CreateMultiSignatureWitness(request.Signatures);
}
if (witness is null)
{
return(Error.INVALID_SIGNATURES.ToJson());
}
neoTx.Witnesses = new Witness[] { witness };
byte[] signed = neoTx.ToArray();
ConstructionCombineResponse response = new ConstructionCombineResponse(signed.ToHexString());
return(response.ToJson());
}
/// <summary>
/// Combine creates a network-specific transaction from an unsigned transaction and an array of provided signatures.
/// The signed transaction returned from this method will be sent to the `/construction/submit` endpoint by the caller.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public JObject ConstructionCombine(ConstructionCombineRequest request)
{
if (request.NetworkIdentifier?.Blockchain?.ToLower() != "neo n3")
{
return(Error.NETWORK_IDENTIFIER_INVALID.ToJson());
}
if (request.NetworkIdentifier?.Network?.ToLower() != network)
{
return(Error.NETWORK_IDENTIFIER_INVALID.ToJson());
}
NeoTransaction neoTx;
try
{
byte[] txRaw = Convert.FromBase64String(request.UnsignedTransaction); // use base64 string in N3
neoTx = txRaw.AsSerializable <NeoTransaction>();
}
catch (Exception)
{
return(Error.TX_DESERIALIZE_ERROR.ToJson());
}
if (neoTx.Witnesses == null || neoTx.Witnesses.Length != neoTx.Signers.Length)
{
return(Error.TX_WITNESSES_INVALID.ToJson());
}
if (request.Signatures.Length == 0)
{
return(Error.NO_SIGNATURE.ToJson());
}
var signData = neoTx.GetSignData(system.Settings.Network);
for (int i = 0; i < neoTx.Signers.Length; i++)
{
var witness = neoTx.Witnesses[i];
if (witness.VerificationScript.IsSignatureContract())
{
var sign = request.Signatures.First(s =>
s.PublicKey.AddressHash == neoTx.Signers[i].Account);
CreateSignatureWitness(witness, sign, signData);
}
else if (witness.VerificationScript.IsMultiSigContract(out var m, out ECPoint[] points))
{
var pubKeys = points.OrderBy(p => p).Select(p => p.ToUInt160FromPublicKey()).ToList();
var signs = new List <byte[]>();
var count = 0;
foreach (var pubkeyhash in pubKeys)
{
if (count == m)
{
break;
}
var sign = request.Signatures.First(s => s.PublicKey.AddressHash == pubkeyhash);
signs.Add(sign.HexBytes.HexToBytes());
count++;
}
var mulWitness = new Witness();
using (ScriptBuilder sb = new ScriptBuilder())
{
signs.ForEach(p => sb.EmitPush(p));
witness.InvocationScript = sb.ToArray();
}
}
}
byte[] signed = neoTx.ToArray();
ConstructionCombineResponse response = new ConstructionCombineResponse(Convert.ToBase64String(signed));
return(response.ToJson());
}