diff options
Diffstat (limited to 'src/rpc/rawtransaction.cpp')
| -rw-r--r-- | src/rpc/rawtransaction.cpp | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp index 2adfd0c0fc..866158e003 100644 --- a/src/rpc/rawtransaction.cpp +++ b/src/rpc/rawtransaction.cpp @@ -1755,6 +1755,80 @@ UniValue utxoupdatepsbt(const JSONRPCRequest& request) return EncodeBase64((unsigned char*)ssTx.data(), ssTx.size()); } +UniValue joinpsbts(const JSONRPCRequest& request) +{ + if (request.fHelp || request.params.size() != 1) { + throw std::runtime_error( + RPCHelpMan{"joinpsbts", + "\nJoins multiple distinct PSBTs with different inputs and outputs into one PSBT with inputs and outputs from all of the PSBTs\n" + "No input in any of the PSBTs can be in more than one of the PSBTs.\n", + { + {"txs", RPCArg::Type::ARR, RPCArg::Optional::NO, "A json array of base64 strings of partially signed transactions", + { + {"psbt", RPCArg::Type::STR, RPCArg::Optional::NO, "A base64 string of a PSBT"} + }} + }, + RPCResult { + " \"psbt\" (string) The base64-encoded partially signed transaction\n" + }, + RPCExamples { + HelpExampleCli("joinpsbts", "\"psbt\"") + }}.ToString()); + } + + RPCTypeCheck(request.params, {UniValue::VARR}, true); + + // Unserialize the transactions + std::vector<PartiallySignedTransaction> psbtxs; + UniValue txs = request.params[0].get_array(); + + if (txs.size() <= 1) { + throw JSONRPCError(RPC_INVALID_PARAMETER, "At least two PSBTs are required to join PSBTs."); + } + + int32_t best_version = 1; + uint32_t best_locktime = 0xffffffff; + for (unsigned int i = 0; i < txs.size(); ++i) { + PartiallySignedTransaction psbtx; + std::string error; + if (!DecodeBase64PSBT(psbtx, txs[i].get_str(), error)) { + throw JSONRPCError(RPC_DESERIALIZATION_ERROR, strprintf("TX decode failed %s", error)); + } + psbtxs.push_back(psbtx); + // Choose the highest version number + if (psbtx.tx->nVersion > best_version) { + best_version = psbtx.tx->nVersion; + } + // Choose the lowest lock time + if (psbtx.tx->nLockTime < best_locktime) { + best_locktime = psbtx.tx->nLockTime; + } + } + + // Create a blank psbt where everything will be added + PartiallySignedTransaction merged_psbt; + merged_psbt.tx = CMutableTransaction(); + merged_psbt.tx->nVersion = best_version; + merged_psbt.tx->nLockTime = best_locktime; + + // Merge + for (auto& psbt : psbtxs) { + for (unsigned int i = 0; i < psbt.tx->vin.size(); ++i) { + if (!merged_psbt.AddInput(psbt.tx->vin[i], psbt.inputs[i])) { + throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Input %s:%d exists in multiple PSBTs", psbt.tx->vin[i].prevout.hash.ToString().c_str(), psbt.tx->vin[i].prevout.n)); + } + } + for (unsigned int i = 0; i < psbt.tx->vout.size(); ++i) { + merged_psbt.AddOutput(psbt.tx->vout[i], psbt.outputs[i]); + } + merged_psbt.unknown.insert(psbt.unknown.begin(), psbt.unknown.end()); + } + + CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION); + ssTx << merged_psbt; + return EncodeBase64((unsigned char*)ssTx.data(), ssTx.size()); +} + // clang-format off static const CRPCCommand commands[] = { // category name actor (function) argNames @@ -1774,6 +1848,7 @@ static const CRPCCommand commands[] = { "rawtransactions", "createpsbt", &createpsbt, {"inputs","outputs","locktime","replaceable"} }, { "rawtransactions", "converttopsbt", &converttopsbt, {"hexstring","permitsigdata","iswitness"} }, { "rawtransactions", "utxoupdatepsbt", &utxoupdatepsbt, {"psbt"} }, + { "rawtransactions", "joinpsbts", &joinpsbts, {"txs"} }, { "blockchain", "gettxoutproof", &gettxoutproof, {"txids", "blockhash"} }, { "blockchain", "verifytxoutproof", &verifytxoutproof, {"proof"} }, |