aboutsummaryrefslogtreecommitdiff
path: root/src/rpc/rawtransaction_util.cpp
blob: a62f90215a02315fd5c6f852b588966c0658da2b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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 <rpc/rawtransaction_util.h>

#include <coins.h>
#include <consensus/amount.h>
#include <core_io.h>
#include <key_io.h>
#include <policy/policy.h>
#include <primitives/transaction.h>
#include <rpc/request.h>
#include <rpc/util.h>
#include <script/sign.h>
#include <script/signingprovider.h>
#include <tinyformat.h>
#include <univalue.h>
#include <util/rbf.h>
#include <util/strencodings.h>
#include <util/translation.h>

void AddInputs(CMutableTransaction& rawTx, const UniValue& inputs_in, std::optional<bool> rbf)
{
    UniValue inputs;
    if (inputs_in.isNull()) {
        inputs = UniValue::VARR;
    } else {
        inputs = inputs_in.get_array();
    }

    for (unsigned int idx = 0; idx < inputs.size(); idx++) {
        const UniValue& input = inputs[idx];
        const UniValue& o = input.get_obj();

        Txid txid = Txid::FromUint256(ParseHashO(o, "txid"));

        const UniValue& vout_v = o.find_value("vout");
        if (!vout_v.isNum())
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key");
        int nOutput = vout_v.getInt<int>();
        if (nOutput < 0)
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout cannot be negative");

        uint32_t nSequence;

        if (rbf.value_or(true)) {
            nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
        } else if (rawTx.nLockTime) {
            nSequence = CTxIn::MAX_SEQUENCE_NONFINAL; /* CTxIn::SEQUENCE_FINAL - 1 */
        } else {
            nSequence = CTxIn::SEQUENCE_FINAL;
        }

        // set the sequence number if passed in the parameters object
        const UniValue& sequenceObj = o.find_value("sequence");
        if (sequenceObj.isNum()) {
            int64_t seqNr64 = sequenceObj.getInt<int64_t>();
            if (seqNr64 < 0 || seqNr64 > CTxIn::SEQUENCE_FINAL) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, sequence number is out of range");
            } else {
                nSequence = (uint32_t)seqNr64;
            }
        }

        CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence);

        rawTx.vin.push_back(in);
    }
}

UniValue NormalizeOutputs(const UniValue& outputs_in)
{
    if (outputs_in.isNull()) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, output argument must be non-null");
    }

    const bool outputs_is_obj = outputs_in.isObject();
    UniValue outputs = outputs_is_obj ? outputs_in.get_obj() : outputs_in.get_array();

    if (!outputs_is_obj) {
        // Translate array of key-value pairs into dict
        UniValue outputs_dict = UniValue(UniValue::VOBJ);
        for (size_t i = 0; i < outputs.size(); ++i) {
            const UniValue& output = outputs[i];
            if (!output.isObject()) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair not an object as expected");
            }
            if (output.size() != 1) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair must contain exactly one key");
            }
            outputs_dict.pushKVs(output);
        }
        outputs = std::move(outputs_dict);
    }
    return outputs;
}

std::vector<std::pair<CTxDestination, CAmount>> ParseOutputs(const UniValue& outputs)
{
    // Duplicate checking
    std::set<CTxDestination> destinations;
    std::vector<std::pair<CTxDestination, CAmount>> parsed_outputs;
    bool has_data{false};
    for (const std::string& name_ : outputs.getKeys()) {
        if (name_ == "data") {
            if (has_data) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, duplicate key: data");
            }
            has_data = true;
            std::vector<unsigned char> data = ParseHexV(outputs[name_].getValStr(), "Data");
            CTxDestination destination{CNoDestination{CScript() << OP_RETURN << data}};
            CAmount amount{0};
            parsed_outputs.emplace_back(destination, amount);
        } else {
            CTxDestination destination{DecodeDestination(name_)};
            CAmount amount{AmountFromValue(outputs[name_])};
            if (!IsValidDestination(destination)) {
                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
            }

            if (!destinations.insert(destination).second) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
            }
            parsed_outputs.emplace_back(destination, amount);
        }
    }
    return parsed_outputs;
}

void AddOutputs(CMutableTransaction& rawTx, const UniValue& outputs_in)
{
    UniValue outputs(UniValue::VOBJ);
    outputs = NormalizeOutputs(outputs_in);

    std::vector<std::pair<CTxDestination, CAmount>> parsed_outputs = ParseOutputs(outputs);
    for (const auto& [destination, nAmount] : parsed_outputs) {
        CScript scriptPubKey = GetScriptForDestination(destination);

        CTxOut out(nAmount, scriptPubKey);
        rawTx.vout.push_back(out);
    }
}

CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, std::optional<bool> rbf)
{
    CMutableTransaction rawTx;

    if (!locktime.isNull()) {
        int64_t nLockTime = locktime.getInt<int64_t>();
        if (nLockTime < 0 || nLockTime > LOCKTIME_MAX)
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range");
        rawTx.nLockTime = nLockTime;
    }

    AddInputs(rawTx, inputs_in, rbf);
    AddOutputs(rawTx, outputs_in);

    if (rbf.has_value() && rbf.value() && rawTx.vin.size() > 0 && !SignalsOptInRBF(CTransaction(rawTx))) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
    }

    return rawTx;
}

/** Pushes a JSON object for script verification or signing errors to vErrorsRet. */
static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std::string& strMessage)
{
    UniValue entry(UniValue::VOBJ);
    entry.pushKV("txid", txin.prevout.hash.ToString());
    entry.pushKV("vout", (uint64_t)txin.prevout.n);
    UniValue witness(UniValue::VARR);
    for (unsigned int i = 0; i < txin.scriptWitness.stack.size(); i++) {
        witness.push_back(HexStr(txin.scriptWitness.stack[i]));
    }
    entry.pushKV("witness", std::move(witness));
    entry.pushKV("scriptSig", HexStr(txin.scriptSig));
    entry.pushKV("sequence", (uint64_t)txin.nSequence);
    entry.pushKV("error", strMessage);
    vErrorsRet.push_back(std::move(entry));
}

void ParsePrevouts(const UniValue& prevTxsUnival, FillableSigningProvider* keystore, std::map<COutPoint, Coin>& coins)
{
    if (!prevTxsUnival.isNull()) {
        const UniValue& prevTxs = prevTxsUnival.get_array();
        for (unsigned int idx = 0; idx < prevTxs.size(); ++idx) {
            const UniValue& p = prevTxs[idx];
            if (!p.isObject()) {
                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "expected object with {\"txid'\",\"vout\",\"scriptPubKey\"}");
            }

            const UniValue& prevOut = p.get_obj();

            RPCTypeCheckObj(prevOut,
                {
                    {"txid", UniValueType(UniValue::VSTR)},
                    {"vout", UniValueType(UniValue::VNUM)},
                    {"scriptPubKey", UniValueType(UniValue::VSTR)},
                });

            Txid txid = Txid::FromUint256(ParseHashO(prevOut, "txid"));

            int nOut = prevOut.find_value("vout").getInt<int>();
            if (nOut < 0) {
                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "vout cannot be negative");
            }

            COutPoint out(txid, nOut);
            std::vector<unsigned char> pkData(ParseHexO(prevOut, "scriptPubKey"));
            CScript scriptPubKey(pkData.begin(), pkData.end());

            {
                auto coin = coins.find(out);
                if (coin != coins.end() && !coin->second.IsSpent() && coin->second.out.scriptPubKey != scriptPubKey) {
                    std::string err("Previous output scriptPubKey mismatch:\n");
                    err = err + ScriptToAsmStr(coin->second.out.scriptPubKey) + "\nvs:\n"+
                        ScriptToAsmStr(scriptPubKey);
                    throw JSONRPCError(RPC_DESERIALIZATION_ERROR, err);
                }
                Coin newcoin;
                newcoin.out.scriptPubKey = scriptPubKey;
                newcoin.out.nValue = MAX_MONEY;
                if (prevOut.exists("amount")) {
                    newcoin.out.nValue = AmountFromValue(prevOut.find_value("amount"));
                }
                newcoin.nHeight = 1;
                coins[out] = std::move(newcoin);
            }

            // if redeemScript and private keys were given, add redeemScript to the keystore so it can be signed
            const bool is_p2sh = scriptPubKey.IsPayToScriptHash();
            const bool is_p2wsh = scriptPubKey.IsPayToWitnessScriptHash();
            if (keystore && (is_p2sh || is_p2wsh)) {
                RPCTypeCheckObj(prevOut,
                    {
                        {"redeemScript", UniValueType(UniValue::VSTR)},
                        {"witnessScript", UniValueType(UniValue::VSTR)},
                    }, true);
                const UniValue& rs{prevOut.find_value("redeemScript")};
                const UniValue& ws{prevOut.find_value("witnessScript")};
                if (rs.isNull() && ws.isNull()) {
                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Missing redeemScript/witnessScript");
                }

                // work from witnessScript when possible
                std::vector<unsigned char> scriptData(!ws.isNull() ? ParseHexV(ws, "witnessScript") : ParseHexV(rs, "redeemScript"));
                CScript script(scriptData.begin(), scriptData.end());
                keystore->AddCScript(script);
                // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
                // This is done for redeemScript only for compatibility, it is encouraged to use the explicit witnessScript field instead.
                CScript witness_output_script{GetScriptForDestination(WitnessV0ScriptHash(script))};
                keystore->AddCScript(witness_output_script);

                if (!ws.isNull() && !rs.isNull()) {
                    // if both witnessScript and redeemScript are provided,
                    // they should either be the same (for backwards compat),
                    // or the redeemScript should be the encoded form of
                    // the witnessScript (ie, for p2sh-p2wsh)
                    if (ws.get_str() != rs.get_str()) {
                        std::vector<unsigned char> redeemScriptData(ParseHexV(rs, "redeemScript"));
                        CScript redeemScript(redeemScriptData.begin(), redeemScriptData.end());
                        if (redeemScript != witness_output_script) {
                            throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript does not correspond to witnessScript");
                        }
                    }
                }

                if (is_p2sh) {
                    const CTxDestination p2sh{ScriptHash(script)};
                    const CTxDestination p2sh_p2wsh{ScriptHash(witness_output_script)};
                    if (scriptPubKey == GetScriptForDestination(p2sh)) {
                        // traditional p2sh; arguably an error if
                        // we got here with rs.IsNull(), because
                        // that means the p2sh script was specified
                        // via witnessScript param, but for now
                        // we'll just quietly accept it
                    } else if (scriptPubKey == GetScriptForDestination(p2sh_p2wsh)) {
                        // p2wsh encoded as p2sh; ideally the witness
                        // script was specified in the witnessScript
                        // param, but also support specifying it via
                        // redeemScript param for backwards compat
                        // (in which case ws.IsNull() == true)
                    } else {
                        // otherwise, can't generate scriptPubKey from
                        // either script, so we got unusable parameters
                        throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript/witnessScript does not match scriptPubKey");
                    }
                } else if (is_p2wsh) {
                    // plain p2wsh; could throw an error if script
                    // was specified by redeemScript rather than
                    // witnessScript (ie, ws.IsNull() == true), but
                    // accept it for backwards compat
                    const CTxDestination p2wsh{WitnessV0ScriptHash(script)};
                    if (scriptPubKey != GetScriptForDestination(p2wsh)) {
                        throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript/witnessScript does not match scriptPubKey");
                    }
                }
            }
        }
    }
}

void SignTransaction(CMutableTransaction& mtx, const SigningProvider* keystore, const std::map<COutPoint, Coin>& coins, const UniValue& hashType, UniValue& result)
{
    int nHashType = ParseSighashString(hashType);

    // Script verification errors
    std::map<int, bilingual_str> input_errors;

    bool complete = SignTransaction(mtx, keystore, coins, nHashType, input_errors);
    SignTransactionResultToJSON(mtx, complete, coins, input_errors, result);
}

void SignTransactionResultToJSON(CMutableTransaction& mtx, bool complete, const std::map<COutPoint, Coin>& coins, const std::map<int, bilingual_str>& input_errors, UniValue& result)
{
    // Make errors UniValue
    UniValue vErrors(UniValue::VARR);
    for (const auto& err_pair : input_errors) {
        if (err_pair.second.original == "Missing amount") {
            // This particular error needs to be an exception for some reason
            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing amount for %s", coins.at(mtx.vin.at(err_pair.first).prevout).out.ToString()));
        }
        TxInErrorToJSON(mtx.vin.at(err_pair.first), vErrors, err_pair.second.original);
    }

    result.pushKV("hex", EncodeHexTx(CTransaction(mtx)));
    result.pushKV("complete", complete);
    if (!vErrors.empty()) {
        if (result.exists("errors")) {
            vErrors.push_backV(result["errors"].getValues());
        }
        result.pushKV("errors", std::move(vErrors));
    }
}