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// Copyright (c) 2018-2022 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 <external_signer.h>
#include <chainparams.h>
#include <common/run_command.h>
#include <core_io.h>
#include <psbt.h>
#include <util/strencodings.h>
#include <algorithm>
#include <stdexcept>
#include <string>
#include <vector>
ExternalSigner::ExternalSigner(const std::string& command, const std::string chain, const std::string& fingerprint, const std::string name): m_command(command), m_chain(chain), m_fingerprint(fingerprint), m_name(name) {}
std::string ExternalSigner::NetworkArg() const
{
return " --chain " + m_chain;
}
bool ExternalSigner::Enumerate(const std::string& command, std::vector<ExternalSigner>& signers, const std::string chain)
{
// Call <command> enumerate
const UniValue result = RunCommandParseJSON(command + " enumerate");
if (!result.isArray()) {
throw std::runtime_error(strprintf("'%s' received invalid response, expected array of signers", command));
}
for (const UniValue& signer : result.getValues()) {
// Check for error
const UniValue& error = signer.find_value("error");
if (!error.isNull()) {
if (!error.isStr()) {
throw std::runtime_error(strprintf("'%s' error", command));
}
throw std::runtime_error(strprintf("'%s' error: %s", command, error.getValStr()));
}
// Check if fingerprint is present
const UniValue& fingerprint = signer.find_value("fingerprint");
if (fingerprint.isNull()) {
throw std::runtime_error(strprintf("'%s' received invalid response, missing signer fingerprint", command));
}
const std::string& fingerprintStr{fingerprint.get_str()};
// Skip duplicate signer
bool duplicate = false;
for (const ExternalSigner& signer : signers) {
if (signer.m_fingerprint.compare(fingerprintStr) == 0) duplicate = true;
}
if (duplicate) break;
std::string name;
const UniValue& model_field = signer.find_value("model");
if (model_field.isStr() && model_field.getValStr() != "") {
name += model_field.getValStr();
}
signers.emplace_back(command, chain, fingerprintStr, name);
}
return true;
}
UniValue ExternalSigner::DisplayAddress(const std::string& descriptor) const
{
return RunCommandParseJSON(m_command + " --fingerprint " + m_fingerprint + NetworkArg() + " displayaddress --desc " + descriptor);
}
UniValue ExternalSigner::GetDescriptors(const int account)
{
return RunCommandParseJSON(m_command + " --fingerprint " + m_fingerprint + NetworkArg() + " getdescriptors --account " + strprintf("%d", account));
}
bool ExternalSigner::SignTransaction(PartiallySignedTransaction& psbtx, std::string& error)
{
// Serialize the PSBT
DataStream ssTx{};
ssTx << psbtx;
// parse ExternalSigner master fingerprint
std::vector<unsigned char> parsed_m_fingerprint = ParseHex(m_fingerprint);
// Check if signer fingerprint matches any input master key fingerprint
auto matches_signer_fingerprint = [&](const PSBTInput& input) {
for (const auto& entry : input.hd_keypaths) {
if (parsed_m_fingerprint == MakeUCharSpan(entry.second.fingerprint)) return true;
}
for (const auto& entry : input.m_tap_bip32_paths) {
if (parsed_m_fingerprint == MakeUCharSpan(entry.second.second.fingerprint)) return true;
}
return false;
};
if (!std::any_of(psbtx.inputs.begin(), psbtx.inputs.end(), matches_signer_fingerprint)) {
error = "Signer fingerprint " + m_fingerprint + " does not match any of the inputs:\n" + EncodeBase64(ssTx.str());
return false;
}
const std::string command = m_command + " --stdin --fingerprint " + m_fingerprint + NetworkArg();
const std::string stdinStr = "signtx " + EncodeBase64(ssTx.str());
const UniValue signer_result = RunCommandParseJSON(command, stdinStr);
if (signer_result.find_value("error").isStr()) {
error = signer_result.find_value("error").get_str();
return false;
}
if (!signer_result.find_value("psbt").isStr()) {
error = "Unexpected result from signer";
return false;
}
PartiallySignedTransaction signer_psbtx;
std::string signer_psbt_error;
if (!DecodeBase64PSBT(signer_psbtx, signer_result.find_value("psbt").get_str(), signer_psbt_error)) {
error = strprintf("TX decode failed %s", signer_psbt_error);
return false;
}
psbtx = signer_psbtx;
return true;
}
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