1  // Copyright (c) 2010 Satoshi Nakamoto
  2  // Copyright (c) 2009-present The Bitcoin Core developers
  3  // Distributed under the MIT software license, see the accompanying
  4  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  5  
  6  #include <rpc/rawtransaction_util.h>
  7  
  8  #include <coins.h>
  9  #include <consensus/amount.h>
 10  #include <core_io.h>
 11  #include <key_io.h>
 12  #include <policy/policy.h>
 13  #include <primitives/transaction.h>
 14  #include <rpc/request.h>
 15  #include <rpc/util.h>
 16  #include <script/sign.h>
 17  #include <script/signingprovider.h>
 18  #include <tinyformat.h>
 19  #include <univalue.h>
 20  #include <util/rbf.h>
 21  #include <util/string.h>
 22  #include <util/strencodings.h>
 23  #include <util/translation.h>
 24  
 25  void AddInputs(CMutableTransaction& rawTx, const UniValue& inputs_in, std::optional<bool> rbf)
 26  {
 27      UniValue inputs;
 28      if (inputs_in.isNull()) {
 29          inputs = UniValue::VARR;
 30      } else {
 31          inputs = inputs_in.get_array();
 32      }
 33  
 34      for (unsigned int idx = 0; idx < inputs.size(); idx++) {
 35          const UniValue& input = inputs[idx];
 36          const UniValue& o = input.get_obj();
 37  
 38          Txid txid = Txid::FromUint256(ParseHashO(o, "txid"));
 39  
 40          const UniValue& vout_v = o.find_value("vout");
 41          if (!vout_v.isNum())
 42              throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key");
 43          int nOutput = vout_v.getInt<int>();
 44          if (nOutput < 0)
 45              throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout cannot be negative");
 46  
 47          uint32_t nSequence;
 48  
 49          if (rbf.value_or(true)) {
 50              nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
 51          } else if (rawTx.nLockTime) {
 52              nSequence = CTxIn::MAX_SEQUENCE_NONFINAL; /* CTxIn::SEQUENCE_FINAL - 1 */
 53          } else {
 54              nSequence = CTxIn::SEQUENCE_FINAL;
 55          }
 56  
 57          // set the sequence number if passed in the parameters object
 58          const UniValue& sequenceObj = o.find_value("sequence");
 59          if (sequenceObj.isNum()) {
 60              int64_t seqNr64 = sequenceObj.getInt<int64_t>();
 61              if (seqNr64 < 0 || seqNr64 > CTxIn::SEQUENCE_FINAL) {
 62                  throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, sequence number is out of range");
 63              } else {
 64                  nSequence = (uint32_t)seqNr64;
 65              }
 66          }
 67  
 68          CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence);
 69  
 70          rawTx.vin.push_back(in);
 71      }
 72  }
 73  
 74  UniValue NormalizeOutputs(const UniValue& outputs_in)
 75  {
 76      if (outputs_in.isNull()) {
 77          throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, output argument must be non-null");
 78      }
 79  
 80      const bool outputs_is_obj = outputs_in.isObject();
 81      UniValue outputs = outputs_is_obj ? outputs_in.get_obj() : outputs_in.get_array();
 82  
 83      if (!outputs_is_obj) {
 84          // Translate array of key-value pairs into dict
 85          UniValue outputs_dict = UniValue(UniValue::VOBJ);
 86          for (size_t i = 0; i < outputs.size(); ++i) {
 87              const UniValue& output = outputs[i];
 88              if (!output.isObject()) {
 89                  throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair not an object as expected");
 90              }
 91              if (output.size() != 1) {
 92                  throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, key-value pair must contain exactly one key");
 93              }
 94              outputs_dict.pushKVs(output);
 95          }
 96          outputs = std::move(outputs_dict);
 97      }
 98      return outputs;
 99  }
100  
101  std::vector<std::pair<CTxDestination, CAmount>> ParseOutputs(const UniValue& outputs)
102  {
103      // Duplicate checking
104      std::set<CTxDestination> destinations;
105      std::vector<std::pair<CTxDestination, CAmount>> parsed_outputs;
106      bool has_data{false};
107      for (const std::string& name_ : outputs.getKeys()) {
108          if (name_ == "data") {
109              if (has_data) {
110                  throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, duplicate key: data");
111              }
112              has_data = true;
113              std::vector<unsigned char> data = ParseHexV(outputs[name_].getValStr(), "Data");
114              CTxDestination destination{CNoDestination{CScript() << OP_RETURN << data}};
115              CAmount amount{0};
116              parsed_outputs.emplace_back(destination, amount);
117          } else {
118              CTxDestination destination{DecodeDestination(name_)};
119              CAmount amount{AmountFromValue(outputs[name_])};
120              if (!IsValidDestination(destination)) {
121                  throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_);
122              }
123  
124              if (!destinations.insert(destination).second) {
125                  throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_);
126              }
127              parsed_outputs.emplace_back(destination, amount);
128          }
129      }
130      return parsed_outputs;
131  }
132  
133  void AddOutputs(CMutableTransaction& rawTx, const UniValue& outputs_in)
134  {
135      UniValue outputs(UniValue::VOBJ);
136      outputs = NormalizeOutputs(outputs_in);
137  
138      std::vector<std::pair<CTxDestination, CAmount>> parsed_outputs = ParseOutputs(outputs);
139      for (const auto& [destination, nAmount] : parsed_outputs) {
140          CScript scriptPubKey = GetScriptForDestination(destination);
141  
142          CTxOut out(nAmount, scriptPubKey);
143          rawTx.vout.push_back(out);
144      }
145  }
146  
147  CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, std::optional<bool> rbf, const uint32_t version)
148  {
149      CMutableTransaction rawTx;
150  
151      if (!locktime.isNull()) {
152          int64_t nLockTime = locktime.getInt<int64_t>();
153          if (nLockTime < 0 || nLockTime > LOCKTIME_MAX)
154              throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range");
155          rawTx.nLockTime = nLockTime;
156      }
157  
158      if (version < TX_MIN_STANDARD_VERSION || version > TX_MAX_STANDARD_VERSION) {
159          throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter, version out of range(%d~%d)", TX_MIN_STANDARD_VERSION, TX_MAX_STANDARD_VERSION));
160      }
161      rawTx.version = version;
162  
163      AddInputs(rawTx, inputs_in, rbf);
164      AddOutputs(rawTx, outputs_in);
165  
166      if (rbf.has_value() && rbf.value() && rawTx.vin.size() > 0 && !SignalsOptInRBF(CTransaction(rawTx))) {
167          throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
168      }
169  
170      return rawTx;
171  }
172  
173  /** Pushes a JSON object for script verification or signing errors to vErrorsRet. */
174  static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std::string& strMessage)
175  {
176      UniValue entry(UniValue::VOBJ);
177      entry.pushKV("txid", txin.prevout.hash.ToString());
178      entry.pushKV("vout", txin.prevout.n);
179      UniValue witness(UniValue::VARR);
180      for (unsigned int i = 0; i < txin.scriptWitness.stack.size(); i++) {
181          witness.push_back(HexStr(txin.scriptWitness.stack[i]));
182      }
183      entry.pushKV("witness", std::move(witness));
184      entry.pushKV("scriptSig", HexStr(txin.scriptSig));
185      entry.pushKV("sequence", txin.nSequence);
186      entry.pushKV("error", strMessage);
187      vErrorsRet.push_back(std::move(entry));
188  }
189  
190  void ParsePrevouts(const UniValue& prevTxsUnival, FlatSigningProvider* keystore, std::map<COutPoint, Coin>& coins)
191  {
192      if (!prevTxsUnival.isNull()) {
193          const UniValue& prevTxs = prevTxsUnival.get_array();
194          for (unsigned int idx = 0; idx < prevTxs.size(); ++idx) {
195              const UniValue& p = prevTxs[idx];
196              if (!p.isObject()) {
197                  throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "expected object with {\"txid'\",\"vout\",\"scriptPubKey\"}");
198              }
199  
200              const UniValue& prevOut = p.get_obj();
201  
202              RPCTypeCheckObj(prevOut,
203                  {
204                      {"txid", UniValueType(UniValue::VSTR)},
205                      {"vout", UniValueType(UniValue::VNUM)},
206                      {"scriptPubKey", UniValueType(UniValue::VSTR)},
207                  });
208  
209              Txid txid = Txid::FromUint256(ParseHashO(prevOut, "txid"));
210  
211              int nOut = prevOut.find_value("vout").getInt<int>();
212              if (nOut < 0) {
213                  throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "vout cannot be negative");
214              }
215  
216              COutPoint out(txid, nOut);
217              std::vector<unsigned char> pkData(ParseHexO(prevOut, "scriptPubKey"));
218              CScript scriptPubKey(pkData.begin(), pkData.end());
219  
220              {
221                  auto coin = coins.find(out);
222                  if (coin != coins.end() && !coin->second.IsSpent() && coin->second.out.scriptPubKey != scriptPubKey) {
223                      std::string err("Previous output scriptPubKey mismatch:\n");
224                      err = err + ScriptToAsmStr(coin->second.out.scriptPubKey) + "\nvs:\n"+
225                          ScriptToAsmStr(scriptPubKey);
226                      throw JSONRPCError(RPC_DESERIALIZATION_ERROR, err);
227                  }
228                  Coin newcoin;
229                  newcoin.out.scriptPubKey = scriptPubKey;
230                  newcoin.out.nValue = MAX_MONEY;
231                  if (prevOut.exists("amount")) {
232                      newcoin.out.nValue = AmountFromValue(prevOut.find_value("amount"));
233                  }
234                  newcoin.nHeight = 1;
235                  coins[out] = std::move(newcoin);
236              }
237  
238              // if redeemScript and private keys were given, add redeemScript to the keystore so it can be signed
239              const bool is_p2sh = scriptPubKey.IsPayToScriptHash();
240              const bool is_p2wsh = scriptPubKey.IsPayToWitnessScriptHash();
241              if (keystore && (is_p2sh || is_p2wsh)) {
242                  RPCTypeCheckObj(prevOut,
243                      {
244                          {"redeemScript", UniValueType(UniValue::VSTR)},
245                          {"witnessScript", UniValueType(UniValue::VSTR)},
246                      }, true);
247                  const UniValue& rs{prevOut.find_value("redeemScript")};
248                  const UniValue& ws{prevOut.find_value("witnessScript")};
249                  if (rs.isNull() && ws.isNull()) {
250                      throw JSONRPCError(RPC_INVALID_PARAMETER, "Missing redeemScript/witnessScript");
251                  }
252  
253                  // work from witnessScript when possible
254                  std::vector<unsigned char> scriptData(!ws.isNull() ? ParseHexV(ws, "witnessScript") : ParseHexV(rs, "redeemScript"));
255                  CScript script(scriptData.begin(), scriptData.end());
256                  keystore->scripts.emplace(CScriptID(script), script);
257                  // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
258                  // This is done for redeemScript only for compatibility, it is encouraged to use the explicit witnessScript field instead.
259                  CScript witness_output_script{GetScriptForDestination(WitnessV0ScriptHash(script))};
260                  keystore->scripts.emplace(CScriptID(witness_output_script), witness_output_script);
261  
262                  if (!ws.isNull() && !rs.isNull()) {
263                      // if both witnessScript and redeemScript are provided,
264                      // they should either be the same (for backwards compat),
265                      // or the redeemScript should be the encoded form of
266                      // the witnessScript (ie, for p2sh-p2wsh)
267                      if (ws.get_str() != rs.get_str()) {
268                          std::vector<unsigned char> redeemScriptData(ParseHexV(rs, "redeemScript"));
269                          CScript redeemScript(redeemScriptData.begin(), redeemScriptData.end());
270                          if (redeemScript != witness_output_script) {
271                              throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript does not correspond to witnessScript");
272                          }
273                      }
274                  }
275  
276                  if (is_p2sh) {
277                      const CTxDestination p2sh{ScriptHash(script)};
278                      const CTxDestination p2sh_p2wsh{ScriptHash(witness_output_script)};
279                      if (scriptPubKey == GetScriptForDestination(p2sh)) {
280                          // traditional p2sh; arguably an error if
281                          // we got here with rs.IsNull(), because
282                          // that means the p2sh script was specified
283                          // via witnessScript param, but for now
284                          // we'll just quietly accept it
285                      } else if (scriptPubKey == GetScriptForDestination(p2sh_p2wsh)) {
286                          // p2wsh encoded as p2sh; ideally the witness
287                          // script was specified in the witnessScript
288                          // param, but also support specifying it via
289                          // redeemScript param for backwards compat
290                          // (in which case ws.IsNull() == true)
291                      } else {
292                          // otherwise, can't generate scriptPubKey from
293                          // either script, so we got unusable parameters
294                          throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript/witnessScript does not match scriptPubKey");
295                      }
296                  } else if (is_p2wsh) {
297                      // plain p2wsh; could throw an error if script
298                      // was specified by redeemScript rather than
299                      // witnessScript (ie, ws.IsNull() == true), but
300                      // accept it for backwards compat
301                      const CTxDestination p2wsh{WitnessV0ScriptHash(script)};
302                      if (scriptPubKey != GetScriptForDestination(p2wsh)) {
303                          throw JSONRPCError(RPC_INVALID_PARAMETER, "redeemScript/witnessScript does not match scriptPubKey");
304                      }
305                  }
306              }
307          }
308      }
309  }
310  
311  void SignTransaction(CMutableTransaction& mtx, const SigningProvider* keystore, const std::map<COutPoint, Coin>& coins, const UniValue& hashType, UniValue& result)
312  {
313      std::optional<int> nHashType = ParseSighashString(hashType);
314      if (!nHashType) {
315          nHashType = SIGHASH_DEFAULT;
316      }
317  
318      // Script verification errors
319      std::map<int, bilingual_str> input_errors;
320  
321      bool complete = SignTransaction(mtx, keystore, coins, *nHashType, input_errors);
322      SignTransactionResultToJSON(mtx, complete, coins, input_errors, result);
323  }
324  
325  void SignTransactionResultToJSON(CMutableTransaction& mtx, bool complete, const std::map<COutPoint, Coin>& coins, const std::map<int, bilingual_str>& input_errors, UniValue& result)
326  {
327      // Make errors UniValue
328      UniValue vErrors(UniValue::VARR);
329      for (const auto& err_pair : input_errors) {
330          if (err_pair.second.original == "Missing amount") {
331              // This particular error needs to be an exception for some reason
332              throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing amount for %s", coins.at(mtx.vin.at(err_pair.first).prevout).out.ToString()));
333          }
334          TxInErrorToJSON(mtx.vin.at(err_pair.first), vErrors, err_pair.second.original);
335      }
336  
337      result.pushKV("hex", EncodeHexTx(CTransaction(mtx)));
338      result.pushKV("complete", complete);
339      if (!vErrors.empty()) {
340          if (result.exists("errors")) {
341              vErrors.push_backV(result["errors"].getValues());
342          }
343          result.pushKV("errors", std::move(vErrors));
344      }
345  }
346  
347  std::vector<RPCResult> DecodeTxDoc(const std::string& txid_field_doc, bool wallet)
348  {
349      return {
350          {RPCResult::Type::STR_HEX, "txid", txid_field_doc},
351          {RPCResult::Type::STR_HEX, "hash", "The transaction hash (differs from txid for witness transactions)"},
352          {RPCResult::Type::NUM, "size", "The serialized transaction size"},
353          {RPCResult::Type::NUM, "vsize", "The virtual transaction size (differs from size for witness transactions)"},
354          {RPCResult::Type::NUM, "weight", "The transaction's weight (between vsize*4-3 and vsize*4)"},
355          {RPCResult::Type::NUM, "version", "The version"},
356          {RPCResult::Type::NUM_TIME, "locktime", "The lock time"},
357          {RPCResult::Type::ARR, "vin", "",
358          {
359              {RPCResult::Type::OBJ, "", "",
360              {
361                  {RPCResult::Type::STR_HEX, "coinbase", /*optional=*/true, "The coinbase value (only if coinbase transaction)"},
362                  {RPCResult::Type::STR_HEX, "txid", /*optional=*/true, "The transaction id (if not coinbase transaction)"},
363                  {RPCResult::Type::NUM, "vout", /*optional=*/true, "The output number (if not coinbase transaction)"},
364                  {RPCResult::Type::OBJ, "scriptSig", /*optional=*/true, "The script (if not coinbase transaction)",
365                  {
366                      {RPCResult::Type::STR, "asm", "Disassembly of the signature script"},
367                      {RPCResult::Type::STR_HEX, "hex", "The raw signature script bytes, hex-encoded"},
368                  }},
369                  {RPCResult::Type::ARR, "txinwitness", /*optional=*/true, "",
370                  {
371                      {RPCResult::Type::STR_HEX, "hex", "hex-encoded witness data (if any)"},
372                  }},
373                  {RPCResult::Type::NUM, "sequence", "The script sequence number"},
374              }},
375          }},
376          {RPCResult::Type::ARR, "vout", "",
377          {
378              {RPCResult::Type::OBJ, "", "", Cat(
379                  {
380                      {RPCResult::Type::STR_AMOUNT, "value", "The value in " + CURRENCY_UNIT},
381                      {RPCResult::Type::NUM, "n", "index"},
382                      {RPCResult::Type::OBJ, "scriptPubKey", "", ScriptPubKeyDoc()},
383                  },
384                      wallet ?
385                      std::vector<RPCResult>{{RPCResult::Type::BOOL, "ischange", /*optional=*/true, "Output script is change (only present if true)"}} :
386                      std::vector<RPCResult>{}
387                  )
388              },
389          }},
390      };
391  }