/// <summary>
/// Transfer NEP5 tokens.
/// </summary>
/// <param name="attributes"></param>
/// <param name="outputs"></param>
/// <param name="changeAddress"></param>
/// <param name="fee"></param>
/// <returns></returns>
public override async Task <Transaction> TransferNep5(List <TransactionAttribute> attributes,
IEnumerable <TransferOutput> outputs,
UInt160 changeAddress = null, decimal fee = 0)
{
InvocationTransaction tx;
var cOutputs = outputs.Where(p => !p.IsGlobalAsset).GroupBy(p => new
{
AssetId = (UInt160)p.AssetId,
Account = p.ScriptHash
}, (k, g) => new
{
k.AssetId,
Value = g.Aggregate(BigInteger.Zero, (x, y) => x + y.Value.Value),
k.Account
}).ToArray();
if (cOutputs.Length == 0)
{
return(null);
}
var nep5Balances = await TransactionBuilderHelper.GetNep5Balances(AddressScriptHash.ToAddress(), _restService);
using (ScriptBuilder sb = new ScriptBuilder())
{
foreach (var output in cOutputs)
{
var nep5Balance = nep5Balances.SingleOrDefault(x => x.AssetHash == output.AssetId.ToString().Remove(0, 2));
if (nep5Balance == null)
{
throw new WalletException($"Not enough balance of: {output.AssetId} ");
}
sb.EmitAppCall(output.AssetId, Nep5Methods.transfer.ToString(), AddressScriptHash, output.Account, output.Value);
sb.Emit(OpCode.THROWIFNOT);
}
byte[] nonce = GenerateNonce(8);
sb.Emit(OpCode.RET, nonce);
tx = new InvocationTransaction
{
Version = 1,
Script = sb.ToArray()
};
}
if (attributes == null)
{
attributes = new List <TransactionAttribute>();
}
attributes.Add(new TransactionAttribute
{
Usage = TransactionAttributeUsage.Script,
Data = AddressScriptHash.ToArray()
});
tx.Attributes = attributes.ToArray();
tx.Inputs = new CoinReference[0];
tx.Outputs = outputs.Where(p => p.IsGlobalAsset).Select(p => p.ToTxOutput()).ToArray();
tx.Witnesses = new Witness[0];
var gasConsumed = await EstimateGasAsync(tx.Script.ToHexString()); //todo add gas limit
tx.Gas = InvocationTransaction.GetGas(Fixed8.FromDecimal(gasConsumed));
tx = MakeTransaction(tx, AddressScriptHash, changeAddress, Fixed8.FromDecimal(fee));
var success = await SignAndSendTransaction(tx);
return(success ? tx : null);
}
