GenerateInputsOutputs(KeyPair key, string symbol, IEnumerable <TransactionOutput> targets)
{
if (targets == null)
{
throw new WalletException("Invalid amount list");
}
var address = Helper.CreateSignatureRedeemScript(key.PublicKey);
var unspent = await GetUnspent(Wallet.ToAddress(address.ToScriptHash()));
// filter any asset lists with zero unspent inputs
unspent = unspent.Where(pair => pair.Value.Count > 0).ToDictionary(pair => pair.Key, pair => pair.Value);
var inputs = new List <SignedTransaction.Input>();
var outputs = new List <SignedTransaction.Output>();
string assetId;
var info = GetAssetsInfo();
if (info.ContainsKey(symbol))
{
assetId = info[symbol];
}
else
{
throw new WalletException($"{symbol} is not a valid blockchain asset.");
}
if (!unspent.ContainsKey(symbol))
{
throw new WalletException($"Not enough {symbol} in address {address}");
}
decimal cost = 0;
var fromHash = key.PublicKeyHash.ToArray();
var transactionOutputs = targets.ToList();
foreach (var target in transactionOutputs)
{
if (target.AddressHash.SequenceEqual(fromHash))
{
throw new WalletException("Target can't be same as input");
}
cost += target.Amount;
}
var sources = unspent[symbol];
decimal selected = 0;
foreach (var src in sources)
{
selected += (decimal)src.Value;
var input = new SignedTransaction.Input
{
PrevHash = src.TxId.HexToBytes().Reverse().ToArray(),
PrevIndex = src.N
};
inputs.Add(input);
if (selected >= cost)
{
break;
}
}
if (selected < cost)
{
throw new WalletException($"Not enough {symbol}");
}
if (cost > 0)
{
foreach (var target in transactionOutputs)
{
var output = new SignedTransaction.Output
{
AssetId = assetId.HexToBytes().Reverse().ToArray(),
ScriptHash = target.AddressHash.ToArray(),
Value = target.Amount
};
outputs.Add(output);
}
}
if (selected > cost || cost == 0)
{
var left = selected - cost;
var signatureScript = Helper.CreateSignatureRedeemScript(key.PublicKey).ToScriptHash();
var change = new SignedTransaction.Output
{
AssetId = assetId.HexToBytes().Reverse().ToArray(),
ScriptHash = signatureScript.ToArray(),
Value = left
};
outputs.Add(change);
}
return(inputs, outputs);
}
public static void SerializeTransactionInput(BinaryWriter writer, SignedTransaction.Input input)
{
writer.Write(input.PrevHash);
writer.Write((ushort)input.PrevIndex);
}