283 lines
12 KiB
C++
283 lines
12 KiB
C++
// Copyright (c) 2010 Satoshi Nakamoto
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// Copyright (c) 2009-2019 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <rpc/rawtransaction_util.h>
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#include <coins.h>
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#include <core_io.h>
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#include <interfaces/chain.h>
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#include <key_io.h>
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#include <keystore.h>
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#include <policy/policy.h>
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#include <primitives/transaction.h>
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#include <rpc/protocol.h>
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#include <rpc/util.h>
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#include <tinyformat.h>
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#include <univalue.h>
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#include <util/rbf.h>
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#include <util/strencodings.h>
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CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& rbf)
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{
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if (inputs_in.isNull() || outputs_in.isNull())
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, arguments 1 and 2 must be non-null");
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UniValue inputs = inputs_in.get_array();
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const bool outputs_is_obj = outputs_in.isObject();
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UniValue outputs = outputs_is_obj ? outputs_in.get_obj() : outputs_in.get_array();
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CMutableTransaction rawTx;
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if (!locktime.isNull()) {
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int64_t nLockTime = locktime.get_int64();
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if (nLockTime < 0 || nLockTime > LOCKTIME_MAX)
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range");
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rawTx.nLockTime = nLockTime;
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}
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bool rbfOptIn = rbf.isTrue();
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for (unsigned int idx = 0; idx < inputs.size(); idx++) {
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const UniValue& input = inputs[idx];
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const UniValue& o = input.get_obj();
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uint256 txid = ParseHashO(o, "txid");
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const UniValue& vout_v = find_value(o, "vout");
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if (!vout_v.isNum())
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key");
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int nOutput = vout_v.get_int();
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if (nOutput < 0)
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout must be positive");
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uint32_t nSequence;
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if (rbfOptIn) {
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nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
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} else if (rawTx.nLockTime) {
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nSequence = CTxIn::SEQUENCE_FINAL - 1;
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} else {
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nSequence = CTxIn::SEQUENCE_FINAL;
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}
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// set the sequence number if passed in the parameters object
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const UniValue& sequenceObj = find_value(o, "sequence");
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if (sequenceObj.isNum()) {
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int64_t seqNr64 = sequenceObj.get_int64();
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if (seqNr64 < 0 || seqNr64 > CTxIn::SEQUENCE_FINAL) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, sequence number is out of range");
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} else {
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nSequence = (uint32_t)seqNr64;
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}
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}
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CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence);
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rawTx.vin.push_back(in);
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}
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if (!outputs_is_obj) {
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// Translate array of key-value pairs into dict
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UniValue outputs_dict = UniValue(UniValue::VOBJ);
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for (size_t i = 0; i < outputs.size(); ++i) {
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const UniValue& output = outputs[i];
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if (!output.isObject()) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair not an object as expected");
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}
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if (output.size() != 1) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair must contain exactly one key");
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}
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outputs_dict.pushKVs(output);
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}
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outputs = std::move(outputs_dict);
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}
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// Duplicate checking
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std::set<CTxDestination> destinations;
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bool has_data{false};
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for (const std::string& name_ : outputs.getKeys()) {
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if (name_ == "data") {
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if (has_data) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, duplicate key: data");
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}
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has_data = true;
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std::vector<unsigned char> data = ParseHexV(outputs[name_].getValStr(), "Data");
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CTxOut out(0, CScript() << OP_RETURN << data);
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rawTx.vout.push_back(out);
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} else {
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CTxDestination destination = DecodeDestination(name_);
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if (!IsValidDestination(destination)) {
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throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
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}
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if (!destinations.insert(destination).second) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
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}
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CScript scriptPubKey = GetScriptForDestination(destination);
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CAmount nAmount = AmountFromValue(outputs[name_]);
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CTxOut out(nAmount, scriptPubKey);
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rawTx.vout.push_back(out);
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}
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}
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if (!rbf.isNull() && rawTx.vin.size() > 0 && rbfOptIn != SignalsOptInRBF(CTransaction(rawTx))) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
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}
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return rawTx;
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}
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/** Pushes a JSON object for script verification or signing errors to vErrorsRet. */
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static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std::string& strMessage)
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{
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UniValue entry(UniValue::VOBJ);
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entry.pushKV("txid", txin.prevout.hash.ToString());
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entry.pushKV("vout", (uint64_t)txin.prevout.n);
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UniValue witness(UniValue::VARR);
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for (unsigned int i = 0; i < txin.scriptWitness.stack.size(); i++) {
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witness.push_back(HexStr(txin.scriptWitness.stack[i].begin(), txin.scriptWitness.stack[i].end()));
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}
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entry.pushKV("witness", witness);
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entry.pushKV("scriptSig", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
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entry.pushKV("sequence", (uint64_t)txin.nSequence);
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entry.pushKV("error", strMessage);
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vErrorsRet.push_back(entry);
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}
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UniValue SignTransaction(CMutableTransaction& mtx, const UniValue& prevTxsUnival, CBasicKeyStore* keystore, std::map<COutPoint, Coin>& coins, bool is_temp_keystore, const UniValue& hashType)
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{
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// Add previous txouts given in the RPC call:
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if (!prevTxsUnival.isNull()) {
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UniValue prevTxs = prevTxsUnival.get_array();
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for (unsigned int idx = 0; idx < prevTxs.size(); ++idx) {
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const UniValue& p = prevTxs[idx];
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if (!p.isObject()) {
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throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "expected object with {\"txid'\",\"vout\",\"scriptPubKey\"}");
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}
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UniValue prevOut = p.get_obj();
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RPCTypeCheckObj(prevOut,
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{
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{"txid", UniValueType(UniValue::VSTR)},
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{"vout", UniValueType(UniValue::VNUM)},
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{"scriptPubKey", UniValueType(UniValue::VSTR)},
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});
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uint256 txid = ParseHashO(prevOut, "txid");
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int nOut = find_value(prevOut, "vout").get_int();
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if (nOut < 0) {
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throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "vout must be positive");
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}
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COutPoint out(txid, nOut);
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std::vector<unsigned char> pkData(ParseHexO(prevOut, "scriptPubKey"));
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CScript scriptPubKey(pkData.begin(), pkData.end());
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{
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auto coin = coins.find(out);
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if (coin != coins.end() && !coin->second.IsSpent() && coin->second.out.scriptPubKey != scriptPubKey) {
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std::string err("Previous output scriptPubKey mismatch:\n");
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err = err + ScriptToAsmStr(coin->second.out.scriptPubKey) + "\nvs:\n"+
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ScriptToAsmStr(scriptPubKey);
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throw JSONRPCError(RPC_DESERIALIZATION_ERROR, err);
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}
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Coin newcoin;
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newcoin.out.scriptPubKey = scriptPubKey;
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newcoin.out.nValue = MAX_MONEY;
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if (prevOut.exists("amount")) {
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newcoin.out.nValue = AmountFromValue(find_value(prevOut, "amount"));
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}
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newcoin.nHeight = 1;
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coins[out] = std::move(newcoin);
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}
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// if redeemScript and private keys were given, add redeemScript to the keystore so it can be signed
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if (is_temp_keystore && (scriptPubKey.IsPayToScriptHash() || scriptPubKey.IsPayToWitnessScriptHash())) {
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RPCTypeCheckObj(prevOut,
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{
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{"redeemScript", UniValueType(UniValue::VSTR)},
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{"witnessScript", UniValueType(UniValue::VSTR)},
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}, true);
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UniValue rs = find_value(prevOut, "redeemScript");
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if (!rs.isNull()) {
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std::vector<unsigned char> rsData(ParseHexV(rs, "redeemScript"));
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CScript redeemScript(rsData.begin(), rsData.end());
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keystore->AddCScript(redeemScript);
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// Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
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// This is only for compatibility, it is encouraged to use the explicit witnessScript field instead.
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keystore->AddCScript(GetScriptForWitness(redeemScript));
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}
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UniValue ws = find_value(prevOut, "witnessScript");
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if (!ws.isNull()) {
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std::vector<unsigned char> wsData(ParseHexV(ws, "witnessScript"));
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CScript witnessScript(wsData.begin(), wsData.end());
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keystore->AddCScript(witnessScript);
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// Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
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keystore->AddCScript(GetScriptForWitness(witnessScript));
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}
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}
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}
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}
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int nHashType = ParseSighashString(hashType);
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bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
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// Script verification errors
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UniValue vErrors(UniValue::VARR);
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// Use CTransaction for the constant parts of the
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// transaction to avoid rehashing.
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const CTransaction txConst(mtx);
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// Sign what we can:
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for (unsigned int i = 0; i < mtx.vin.size(); i++) {
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CTxIn& txin = mtx.vin[i];
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auto coin = coins.find(txin.prevout);
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if (coin == coins.end() || coin->second.IsSpent()) {
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TxInErrorToJSON(txin, vErrors, "Input not found or already spent");
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continue;
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}
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const CScript& prevPubKey = coin->second.out.scriptPubKey;
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const CAmount& amount = coin->second.out.nValue;
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SignatureData sigdata = DataFromTransaction(mtx, i, coin->second.out);
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// Only sign SIGHASH_SINGLE if there's a corresponding output:
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if (!fHashSingle || (i < mtx.vout.size())) {
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ProduceSignature(*keystore, MutableTransactionSignatureCreator(&mtx, i, amount, nHashType), prevPubKey, sigdata);
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}
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UpdateInput(txin, sigdata);
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// amount must be specified for valid segwit signature
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if (amount == MAX_MONEY && !txin.scriptWitness.IsNull()) {
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throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing amount for %s", coin->second.out.ToString()));
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}
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ScriptError serror = SCRIPT_ERR_OK;
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if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), &serror)) {
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if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) {
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// Unable to sign input and verification failed (possible attempt to partially sign).
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TxInErrorToJSON(txin, vErrors, "Unable to sign input, invalid stack size (possibly missing key)");
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} else {
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TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
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}
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}
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}
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bool fComplete = vErrors.empty();
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UniValue result(UniValue::VOBJ);
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result.pushKV("hex", EncodeHexTx(CTransaction(mtx)));
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result.pushKV("complete", fComplete);
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if (!vErrors.empty()) {
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result.pushKV("errors", vErrors);
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}
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return result;
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}
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