Initial Vexta Core v0.1.0 release
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25c454329d
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src/rpc/rawtransaction_util.cpp
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309
src/rpc/rawtransaction_util.cpp
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// Copyright (c) 2010 Satoshi Nakamoto
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// Copyright (c) 2009-2020 The DigiByte 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 <key_io.h>
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#include <policy/policy.h>
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#include <primitives/transaction.h>
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#include <rpc/request.h>
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#include <rpc/util.h>
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#include <script/sign.h>
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#include <script/signingprovider.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, bool rbf)
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{
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if (outputs_in.isNull()) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, output argument must be non-null");
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}
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UniValue inputs;
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if (inputs_in.isNull()) {
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inputs = UniValue::VARR;
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} else {
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inputs = inputs_in.get_array();
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}
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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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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 cannot be negative");
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uint32_t nSequence;
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if (rbf) {
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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 Vexta 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 && rawTx.vin.size() > 0 && !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]));
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}
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entry.pushKV("witness", witness);
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entry.pushKV("scriptSig", HexStr(txin.scriptSig));
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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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void ParsePrevouts(const UniValue& prevTxsUnival, FillableSigningProvider* keystore, std::map<COutPoint, Coin>& coins)
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{
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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 cannot be negative");
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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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const bool is_p2sh = scriptPubKey.IsPayToScriptHash();
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const bool is_p2wsh = scriptPubKey.IsPayToWitnessScriptHash();
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if (keystore && (is_p2sh || is_p2wsh)) {
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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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UniValue ws = find_value(prevOut, "witnessScript");
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if (rs.isNull() && ws.isNull()) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Missing redeemScript/witnessScript");
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}
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// work from witnessScript when possible
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std::vector<unsigned char> scriptData(!ws.isNull() ? ParseHexV(ws, "witnessScript") : ParseHexV(rs, "redeemScript"));
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CScript script(scriptData.begin(), scriptData.end());
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keystore->AddCScript(script);
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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 done for redeemScript only for compatibility, it is encouraged to use the explicit witnessScript field instead.
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CScript witness_output_script{GetScriptForDestination(WitnessV0ScriptHash(script))};
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keystore->AddCScript(witness_output_script);
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if (!ws.isNull() && !rs.isNull()) {
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// if both witnessScript and redeemScript are provided,
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// they should either be the same (for backwards compat),
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// or the redeemScript should be the encoded form of
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// the witnessScript (ie, for p2sh-p2wsh)
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if (ws.get_str() != rs.get_str()) {
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std::vector<unsigned char> redeemScriptData(ParseHexV(rs, "redeemScript"));
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CScript redeemScript(redeemScriptData.begin(), redeemScriptData.end());
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if (redeemScript != witness_output_script) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript does not correspond to witnessScript");
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}
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}
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}
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if (is_p2sh) {
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const CTxDestination p2sh{ScriptHash(script)};
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const CTxDestination p2sh_p2wsh{ScriptHash(witness_output_script)};
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if (scriptPubKey == GetScriptForDestination(p2sh)) {
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// traditional p2sh; arguably an error if
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// we got here with rs.IsNull(), because
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// that means the p2sh script was specified
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// via witnessScript param, but for now
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// we'll just quietly accept it
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} else if (scriptPubKey == GetScriptForDestination(p2sh_p2wsh)) {
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// p2wsh encoded as p2sh; ideally the witness
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// script was specified in the witnessScript
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// param, but also support specifying it via
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// redeemScript param for backwards compat
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// (in which case ws.IsNull() == true)
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} else {
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// otherwise, can't generate scriptPubKey from
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// either script, so we got unusable parameters
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throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript/witnessScript does not match scriptPubKey");
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}
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} else if (is_p2wsh) {
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// plain p2wsh; could throw an error if script
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// was specified by redeemScript rather than
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// witnessScript (ie, ws.IsNull() == true), but
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// accept it for backwards compat
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const CTxDestination p2wsh{WitnessV0ScriptHash(script)};
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if (scriptPubKey != GetScriptForDestination(p2wsh)) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript/witnessScript does not match scriptPubKey");
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}
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}
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}
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}
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}
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}
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void SignTransaction(CMutableTransaction& mtx, const SigningProvider* keystore, const std::map<COutPoint, Coin>& coins, const UniValue& hashType, UniValue& result)
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{
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int nHashType = ParseSighashString(hashType);
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// Script verification errors
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std::map<int, std::string> input_errors;
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bool complete = SignTransaction(mtx, keystore, coins, nHashType, input_errors);
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SignTransactionResultToJSON(mtx, complete, coins, input_errors, result);
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}
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void SignTransactionResultToJSON(CMutableTransaction& mtx, bool complete, const std::map<COutPoint, Coin>& coins, const std::map<int, std::string>& input_errors, UniValue& result)
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{
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// Make errors UniValue
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UniValue vErrors(UniValue::VARR);
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for (const auto& err_pair : input_errors) {
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if (err_pair.second == "Missing amount") {
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// This particular error needs to be an exception for some reason
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throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing amount for %s", coins.at(mtx.vin.at(err_pair.first).prevout).out.ToString()));
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}
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TxInErrorToJSON(mtx.vin.at(err_pair.first), vErrors, err_pair.second);
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}
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result.pushKV("hex", EncodeHexTx(CTransaction(mtx)));
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result.pushKV("complete", complete);
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if (!vErrors.empty()) {
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if (result.exists("errors")) {
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vErrors.push_backV(result["errors"].getValues());
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}
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result.pushKV("errors", vErrors);
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}
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}
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