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// Copyright (c) 2009-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <wallet/psbtwallet.h>
TransactionError FillPSBT(const CWallet* pwallet, PartiallySignedTransaction& psbtx, bool& complete, int sighash_type, bool sign, bool bip32derivs)
{
LOCK(pwallet->cs_wallet);
// Get all of the previous transactions
complete = true;
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
const CTxIn& txin = psbtx.tx->vin[i];
PSBTInput& input = psbtx.inputs.at(i);
if (PSBTInputSigned(input)) {
continue;
}
// Verify input looks sane. This will check that we have at most one uxto, witness or non-witness.
if (!input.IsSane()) {
return TransactionError::INVALID_PSBT;
}
// If we have no utxo, grab it from the wallet.
if (!input.non_witness_utxo && input.witness_utxo.IsNull()) {
const uint256& txhash = txin.prevout.hash;
const auto it = pwallet->mapWallet.find(txhash);
if (it != pwallet->mapWallet.end()) {
const CWalletTx& wtx = it->second;
// We only need the non_witness_utxo, which is a superset of the witness_utxo.
// The signing code will switch to the smaller witness_utxo if this is ok.
input.non_witness_utxo = wtx.tx;
}
}
// Get the Sighash type
if (sign && input.sighash_type > 0 && input.sighash_type != sighash_type) {
return TransactionError::SIGHASH_MISMATCH;
}
// Get the scriptPubKey to know which SigningProvider to use
CScript script;
if (!input.witness_utxo.IsNull()) {
script = input.witness_utxo.scriptPubKey;
} else if (input.non_witness_utxo) {
if (txin.prevout.n >= input.non_witness_utxo->vout.size()) {
return TransactionError::MISSING_INPUTS;
}
script = input.non_witness_utxo->vout[txin.prevout.n].scriptPubKey;
} else {
// There's no UTXO so we can just skip this now
complete = false;
continue;
}
SignatureData sigdata;
input.FillSignatureData(sigdata);
std::unique_ptr<SigningProvider> provider = pwallet->GetSigningProvider(script, sigdata);
if (!provider) {
complete = false;
continue;
}
complete &= SignPSBTInput(HidingSigningProvider(provider.get(), !sign, !bip32derivs), psbtx, i, sighash_type);
}
// Fill in the bip32 keypaths and redeemscripts for the outputs so that hardware wallets can identify change
for (unsigned int i = 0; i < psbtx.tx->vout.size(); ++i) {
const CTxOut& out = psbtx.tx->vout.at(i);
std::unique_ptr<SigningProvider> provider = pwallet->GetSigningProvider(out.scriptPubKey);
if (provider) {
UpdatePSBTOutput(HidingSigningProvider(provider.get(), true, !bip32derivs), psbtx, i);
}
}
return TransactionError::OK;
}
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