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// Copyright (c) 2020-2022 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 <chainparams.h>
#include <common/args.h>
#include <common/system.h>
#include <external_signer.h>
#include <node/types.h>
#include <wallet/external_signer_scriptpubkeyman.h>
#include <iostream>
#include <key_io.h>
#include <memory>
#include <stdexcept>
#include <string>
#include <univalue.h>
#include <utility>
#include <vector>
using common::PSBTError;
namespace wallet {
bool ExternalSignerScriptPubKeyMan::SetupDescriptor(WalletBatch& batch, std::unique_ptr<Descriptor> desc)
{
LOCK(cs_desc_man);
assert(m_storage.IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
assert(m_storage.IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER));
int64_t creation_time = GetTime();
// Make the descriptor
WalletDescriptor w_desc(std::move(desc), creation_time, 0, 0, 0);
m_wallet_descriptor = w_desc;
// Store the descriptor
if (!batch.WriteDescriptor(GetID(), m_wallet_descriptor)) {
throw std::runtime_error(std::string(__func__) + ": writing descriptor failed");
}
// TopUp
TopUpWithDB(batch);
m_storage.UnsetBlankWalletFlag(batch);
return true;
}
ExternalSigner ExternalSignerScriptPubKeyMan::GetExternalSigner() {
const std::string command = gArgs.GetArg("-signer", "");
if (command == "") throw std::runtime_error(std::string(__func__) + ": restart bitcoind with -signer=<cmd>");
std::vector<ExternalSigner> signers;
ExternalSigner::Enumerate(command, signers, Params().GetChainTypeString());
if (signers.empty()) throw std::runtime_error(std::string(__func__) + ": No external signers found");
// TODO: add fingerprint argument instead of failing in case of multiple signers.
if (signers.size() > 1) throw std::runtime_error(std::string(__func__) + ": More than one external signer found. Please connect only one at a time.");
return signers[0];
}
util::Result<void> ExternalSignerScriptPubKeyMan::DisplayAddress(const CTxDestination& dest, const ExternalSigner &signer) const
{
// TODO: avoid the need to infer a descriptor from inside a descriptor wallet
const CScript& scriptPubKey = GetScriptForDestination(dest);
auto provider = GetSolvingProvider(scriptPubKey);
auto descriptor = InferDescriptor(scriptPubKey, *provider);
const UniValue& result = signer.DisplayAddress(descriptor->ToString());
const UniValue& error = result.find_value("error");
if (error.isStr()) return util::Error{strprintf(_("Signer returned error: %s"), error.getValStr())};
const UniValue& ret_address = result.find_value("address");
if (!ret_address.isStr()) return util::Error{_("Signer did not echo address")};
if (ret_address.getValStr() != EncodeDestination(dest)) {
return util::Error{strprintf(_("Signer echoed unexpected address %s"), ret_address.getValStr())};
}
return util::Result<void>();
}
// If sign is true, transaction must previously have been filled
std::optional<PSBTError> ExternalSignerScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
{
if (!sign) {
return DescriptorScriptPubKeyMan::FillPSBT(psbt, txdata, sighash_type, false, bip32derivs, n_signed, finalize);
}
// Already complete if every input is now signed
bool complete = true;
for (const auto& input : psbt.inputs) {
// TODO: for multisig wallets, we should only care if all _our_ inputs are signed
complete &= PSBTInputSigned(input);
}
if (complete) return {};
std::string strFailReason;
if(!GetExternalSigner().SignTransaction(psbt, strFailReason)) {
tfm::format(std::cerr, "Failed to sign: %s\n", strFailReason);
return PSBTError::EXTERNAL_SIGNER_FAILED;
}
if (finalize) FinalizePSBT(psbt); // This won't work in a multisig setup
return {};
}
} // namespace wallet
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