/// <inheritdoc />
public List <UnspentOutputReference> GetSpendableTransactionsInAccount(WalletAccountReference walletAccountReference, int confirmations = 0)
{
Guard.NotNull(walletAccountReference, nameof(walletAccountReference));
Wallet wallet = this.GetWalletByName(walletAccountReference.WalletName);
HdAccount account = wallet.GetAccountByCoinType(walletAccountReference.AccountName, this.coinType);
if (account == null)
{
throw new WalletException($"Account '{walletAccountReference.AccountName}' in wallet '{walletAccountReference.WalletName}' not found.");
}
return(account.GetSpendableTransactions(this.chain.Tip.Height, confirmations));
}
/// <inheritdoc />
public (string hex, uint256 transactionId, Money fee) BuildTransaction(WalletAccountReference accountReference, string password, Script destinationScript, Money amount, FeeType feeType, int minConfirmations)
{
if (amount == Money.Zero)
{
throw new WalletException($"Cannot send transaction with 0 {this.coinType}");
}
// get the wallet and the account
Wallet wallet = this.GetWalletByName(accountReference.WalletName);
HdAccount account = this.GetAccounts(wallet).GetAccountByName(accountReference.AccountName);
// get a list of transactions outputs that have not been spent
var spendableTransactions = account.GetSpendableTransactions().ToList();
// remove whats under min confirmations
var currentHeight = this.chain.Height;
spendableTransactions = spendableTransactions.Where(s => currentHeight - s.BlockHeight >= minConfirmations).ToList();
// get total spendable balance in the account.
var balance = spendableTransactions.Sum(t => t.Amount);
// make sure we have enough funds
if (balance < amount)
{
throw new WalletException("Not enough funds.");
}
// calculate which addresses needs to be used as well as the fee to be charged
var calculationResult = this.CalculateFees(spendableTransactions, amount, feeType.ToConfirmations());
// get extended private key
var privateKey = Key.Parse(wallet.EncryptedSeed, password, wallet.Network);
var seedExtKey = new ExtKey(privateKey, wallet.ChainCode);
var signingKeys = new HashSet <ISecret>();
var coins = new List <Coin>();
foreach (var transactionToUse in calculationResult.transactionsToUse)
{
var address = account.FindAddressesForTransaction(t => t.Id == transactionToUse.Id && t.Index == transactionToUse.Index && t.Amount > 0).Single();
ExtKey addressExtKey = seedExtKey.Derive(new KeyPath(address.HdPath));
BitcoinExtKey addressPrivateKey = addressExtKey.GetWif(wallet.Network);
signingKeys.Add(addressPrivateKey);
coins.Add(new Coin(transactionToUse.Id, (uint)transactionToUse.Index, transactionToUse.Amount, transactionToUse.ScriptPubKey));
}
// get address to send the change to
var changeAddress = account.GetFirstUnusedChangeAddress();
// build transaction
var builder = new TransactionBuilder();
Transaction tx = builder
.AddCoins(coins)
.AddKeys(signingKeys.ToArray())
.Send(destinationScript, amount)
.SetChange(changeAddress.ScriptPubKey)
.SendFees(calculationResult.fee)
.BuildTransaction(true);
if (!builder.Verify(tx))
{
throw new WalletException("Could not build transaction, please make sure you entered the correct data.");
}
return(tx.ToHex(), tx.GetHash(), calculationResult.fee);
}