private static void CheckCoinbaseSignatureScript(Transaction.Input coinbaseInput)
{
var scriptLength = coinbaseInput.SignatureScript.Length;
if (scriptLength < BlockChain.MinCoinbaseScriptLength || scriptLength > BlockChain.MaxCoinbaseScriptLength)
{
throw new TransactionRuleException($"Coinbase transaction input signature script length {scriptLength} is outside valid range");
}
}
private async Task RecalculatePendingTransaction()
{
if (PendingOutputs.Count == 0 || PendingOutputs.Any(x => !x.IsValid))
{
UnsetPendingTransaction();
return;
}
var walletClient = App.Current.Synchronizer?.WalletRpcClient;
var outputs = PendingOutputs.Select(po =>
{
var amount = po.OutputAmount;
var script = po.BuildOutputScript().Script;
return new Transaction.Output(amount, Transaction.Output.LatestPkScriptVersion, script);
}).ToArray();
TransactionAuthor.InputSource inputSource = async targetAmount =>
{
var inputs = new Transaction.Input[0];
// TODO: don't hardcode confs
var funding = await walletClient.FundTransactionAsync(SelectedAccount.Account, targetAmount, 1);
if (funding.Item2 >= targetAmount)
{
inputs = funding.Item1.Select(o =>
Transaction.Input.CreateFromPrefix(new Transaction.OutPoint(o.TransactionHash, o.OutputIndex, o.Tree),
TransactionRules.MaxInputSequence)).ToArray();
}
return Tuple.Create(funding.Item2, inputs);
};
TransactionAuthor.ChangeSource changeSource = async () =>
{
// Use cached change script if one has already been generated for this account.
var selectedAccount = SelectedAccount.Account;
OutputScript cachedScript;
if (_unusedChangeScripts.TryGetValue(selectedAccount, out cachedScript))
return cachedScript;
var changeAddress = await walletClient.NextInternalAddressAsync(SelectedAccount.Account);
var changeScript = Address.Decode(changeAddress).BuildScript();
_unusedChangeScripts[selectedAccount] = changeScript;
return changeScript;
};
try
{
var r = await TransactionAuthor.BuildUnsignedTransaction(outputs, TransactionFees.DefaultFeePerKb, inputSource, changeSource);
SetPendingTransaction(r.Item1, r.Item2, outputs.Sum(o => o.Amount));
}
catch (Exception ex)
{
UnsetPendingTransaction();
// Insufficient funds will need a nicer error displayed somehow. For now, hide it
// while disabling the UI to create the transaction. All other errors are unexpected.
if (!(ex is InsufficientFundsException)) throw;
}
}