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bitcoin/src/rpc/output_script.cpp

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// 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 <key_io.h>
#include <outputtype.h>
#include <pubkey.h>
#include <rpc/protocol.h>
#include <rpc/request.h>
#include <rpc/server.h>
#include <rpc/util.h>
#include <script/descriptor.h>
#include <script/script.h>
#include <script/signingprovider.h>
#include <script/standard.h>
#include <tinyformat.h>
#include <univalue.h>
#include <util/check.h>
#include <util/strencodings.h>
#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <tuple>
#include <vector>
static RPCHelpMan validateaddress()
{
return RPCHelpMan{
"validateaddress",
"\nReturn information about the given bitcoin address.\n",
{
{"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address to validate"},
},
RPCResult{
RPCResult::Type::OBJ, "", "",
{
{RPCResult::Type::BOOL, "isvalid", "If the address is valid or not"},
{RPCResult::Type::STR, "address", /*optional=*/true, "The bitcoin address validated"},
{RPCResult::Type::STR_HEX, "scriptPubKey", /*optional=*/true, "The hex-encoded scriptPubKey generated by the address"},
{RPCResult::Type::BOOL, "isscript", /*optional=*/true, "If the key is a script"},
{RPCResult::Type::BOOL, "iswitness", /*optional=*/true, "If the address is a witness address"},
{RPCResult::Type::NUM, "witness_version", /*optional=*/true, "The version number of the witness program"},
{RPCResult::Type::STR_HEX, "witness_program", /*optional=*/true, "The hex value of the witness program"},
{RPCResult::Type::STR, "error", /*optional=*/true, "Error message, if any"},
{RPCResult::Type::ARR, "error_locations", /*optional=*/true, "Indices of likely error locations in address, if known (e.g. Bech32 errors)",
{
{RPCResult::Type::NUM, "index", "index of a potential error"},
}},
}
},
RPCExamples{
HelpExampleCli("validateaddress", "\"" + EXAMPLE_ADDRESS[0] + "\"") +
HelpExampleRpc("validateaddress", "\"" + EXAMPLE_ADDRESS[0] + "\"")
},
[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
std::string error_msg;
std::vector<int> error_locations;
CTxDestination dest = DecodeDestination(request.params[0].get_str(), error_msg, &error_locations);
const bool isValid = IsValidDestination(dest);
CHECK_NONFATAL(isValid == error_msg.empty());
UniValue ret(UniValue::VOBJ);
ret.pushKV("isvalid", isValid);
if (isValid) {
std::string currentAddress = EncodeDestination(dest);
ret.pushKV("address", currentAddress);
CScript scriptPubKey = GetScriptForDestination(dest);
ret.pushKV("scriptPubKey", HexStr(scriptPubKey));
UniValue detail = DescribeAddress(dest);
ret.pushKVs(detail);
} else {
UniValue error_indices(UniValue::VARR);
for (int i : error_locations) error_indices.push_back(i);
ret.pushKV("error_locations", error_indices);
ret.pushKV("error", error_msg);
}
return ret;
},
};
}
static RPCHelpMan createmultisig()
{
return RPCHelpMan{"createmultisig",
"\nCreates a multi-signature address with n signature of m keys required.\n"
"It returns a json object with the address and redeemScript.\n",
{
{"nrequired", RPCArg::Type::NUM, RPCArg::Optional::NO, "The number of required signatures out of the n keys."},
{"keys", RPCArg::Type::ARR, RPCArg::Optional::NO, "The hex-encoded public keys.",
{
{"key", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "The hex-encoded public key"},
}},
{"address_type", RPCArg::Type::STR, RPCArg::Default{"legacy"}, "The address type to use. Options are \"legacy\", \"p2sh-segwit\", and \"bech32\"."},
},
RPCResult{
RPCResult::Type::OBJ, "", "",
{
{RPCResult::Type::STR, "address", "The value of the new multisig address."},
{RPCResult::Type::STR_HEX, "redeemScript", "The string value of the hex-encoded redemption script."},
{RPCResult::Type::STR, "descriptor", "The descriptor for this multisig"},
{RPCResult::Type::ARR, "warnings", /*optional=*/true, "Any warnings resulting from the creation of this multisig",
{
{RPCResult::Type::STR, "", ""},
}},
}
},
RPCExamples{
"\nCreate a multisig address from 2 public keys\n"
+ HelpExampleCli("createmultisig", "2 \"[\\\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\\\",\\\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\\\"]\"") +
"\nAs a JSON-RPC call\n"
+ HelpExampleRpc("createmultisig", "2, [\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\",\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\"]")
},
[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
int required = request.params[0].getInt<int>();
// Get the public keys
const UniValue& keys = request.params[1].get_array();
std::vector<CPubKey> pubkeys;
for (unsigned int i = 0; i < keys.size(); ++i) {
if (IsHex(keys[i].get_str()) && (keys[i].get_str().length() == 66 || keys[i].get_str().length() == 130)) {
pubkeys.push_back(HexToPubKey(keys[i].get_str()));
} else {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Invalid public key: %s\n.", keys[i].get_str()));
}
}
// Get the output type
OutputType output_type = OutputType::LEGACY;
if (!request.params[2].isNull()) {
std::optional<OutputType> parsed = ParseOutputType(request.params[2].get_str());
if (!parsed) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown address type '%s'", request.params[2].get_str()));
} else if (parsed.value() == OutputType::BECH32M) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "createmultisig cannot create bech32m multisig addresses");
}
output_type = parsed.value();
}
// Construct using pay-to-script-hash:
FillableSigningProvider keystore;
CScript inner;
const CTxDestination dest = AddAndGetMultisigDestination(required, pubkeys, output_type, keystore, inner);
// Make the descriptor
std::unique_ptr<Descriptor> descriptor = InferDescriptor(GetScriptForDestination(dest), keystore);
UniValue result(UniValue::VOBJ);
result.pushKV("address", EncodeDestination(dest));
result.pushKV("redeemScript", HexStr(inner));
result.pushKV("descriptor", descriptor->ToString());
UniValue warnings(UniValue::VARR);
if (descriptor->GetOutputType() != output_type) {
// Only warns if the user has explicitly chosen an address type we cannot generate
warnings.push_back("Unable to make chosen address type, please ensure no uncompressed public keys are present.");
}
PushWarnings(warnings, result);
return result;
},
};
}
static RPCHelpMan getdescriptorinfo()
{
const std::string EXAMPLE_DESCRIPTOR = "wpkh([d34db33f/84h/0h/0h]0279be667ef9dcbbac55a06295Ce870b07029Bfcdb2dce28d959f2815b16f81798)";
return RPCHelpMan{"getdescriptorinfo",
{"\nAnalyses a descriptor.\n"},
{
{"descriptor", RPCArg::Type::STR, RPCArg::Optional::NO, "The descriptor."},
},
RPCResult{
RPCResult::Type::OBJ, "", "",
{
{RPCResult::Type::STR, "descriptor", "The descriptor in canonical form, without private keys"},
{RPCResult::Type::STR, "checksum", "The checksum for the input descriptor"},
{RPCResult::Type::BOOL, "isrange", "Whether the descriptor is ranged"},
{RPCResult::Type::BOOL, "issolvable", "Whether the descriptor is solvable"},
{RPCResult::Type::BOOL, "hasprivatekeys", "Whether the input descriptor contained at least one private key"},
}
},
RPCExamples{
"Analyse a descriptor\n" +
HelpExampleCli("getdescriptorinfo", "\"" + EXAMPLE_DESCRIPTOR + "\"") +
HelpExampleRpc("getdescriptorinfo", "\"" + EXAMPLE_DESCRIPTOR + "\"")
},
[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
FlatSigningProvider provider;
std::string error;
auto desc = Parse(request.params[0].get_str(), provider, error);
if (!desc) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, error);
}
UniValue result(UniValue::VOBJ);
result.pushKV("descriptor", desc->ToString());
result.pushKV("checksum", GetDescriptorChecksum(request.params[0].get_str()));
result.pushKV("isrange", desc->IsRange());
result.pushKV("issolvable", desc->IsSolvable());
result.pushKV("hasprivatekeys", provider.keys.size() > 0);
return result;
},
};
}
static RPCHelpMan deriveaddresses()
{
const std::string EXAMPLE_DESCRIPTOR = "wpkh([d34db33f/84h/0h/0h]xpub6DJ2dNUysrn5Vt36jH2KLBT2i1auw1tTSSomg8PhqNiUtx8QX2SvC9nrHu81fT41fvDUnhMjEzQgXnQjKEu3oaqMSzhSrHMxyyoEAmUHQbY/0/*)#cjjspncu";
return RPCHelpMan{"deriveaddresses",
{"\nDerives one or more addresses corresponding to an output descriptor.\n"
"Examples of output descriptors are:\n"
" pkh(<pubkey>) P2PKH outputs for the given pubkey\n"
" wpkh(<pubkey>) Native segwit P2PKH outputs for the given pubkey\n"
" sh(multi(<n>,<pubkey>,<pubkey>,...)) P2SH-multisig outputs for the given threshold and pubkeys\n"
" raw(<hex script>) Outputs whose scriptPubKey equals the specified hex scripts\n"
" tr(<pubkey>,multi_a(<n>,<pubkey>,<pubkey>,...)) P2TR-multisig outputs for the given threshold and pubkeys\n"
"\nIn the above, <pubkey> either refers to a fixed public key in hexadecimal notation, or to an xpub/xprv optionally followed by one\n"
"or more path elements separated by \"/\", where \"h\" represents a hardened child key.\n"
"For more information on output descriptors, see the documentation in the doc/descriptors.md file.\n"},
{
{"descriptor", RPCArg::Type::STR, RPCArg::Optional::NO, "The descriptor."},
{"range", RPCArg::Type::RANGE, RPCArg::Optional::OMITTED, "If a ranged descriptor is used, this specifies the end or the range (in [begin,end] notation) to derive."},
},
RPCResult{
RPCResult::Type::ARR, "", "",
{
{RPCResult::Type::STR, "address", "the derived addresses"},
}
},
RPCExamples{
"First three native segwit receive addresses\n" +
HelpExampleCli("deriveaddresses", "\"" + EXAMPLE_DESCRIPTOR + "\" \"[0,2]\"") +
HelpExampleRpc("deriveaddresses", "\"" + EXAMPLE_DESCRIPTOR + "\", \"[0,2]\"")
},
[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
const std::string desc_str = request.params[0].get_str();
int64_t range_begin = 0;
int64_t range_end = 0;
if (request.params.size() >= 2 && !request.params[1].isNull()) {
std::tie(range_begin, range_end) = ParseDescriptorRange(request.params[1]);
}
FlatSigningProvider key_provider;
std::string error;
auto desc = Parse(desc_str, key_provider, error, /* require_checksum = */ true);
if (!desc) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, error);
}
if (!desc->IsRange() && request.params.size() > 1) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Range should not be specified for an un-ranged descriptor");
}
if (desc->IsRange() && request.params.size() == 1) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Range must be specified for a ranged descriptor");
}
UniValue addresses(UniValue::VARR);
for (int64_t i = range_begin; i <= range_end; ++i) {
FlatSigningProvider provider;
std::vector<CScript> scripts;
if (!desc->Expand(i, key_provider, scripts, provider)) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Cannot derive script without private keys");
}
for (const CScript& script : scripts) {
CTxDestination dest;
if (!ExtractDestination(script, dest)) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Descriptor does not have a corresponding address");
}
addresses.push_back(EncodeDestination(dest));
}
}
// This should not be possible, but an assert seems overkill:
if (addresses.empty()) {
throw JSONRPCError(RPC_MISC_ERROR, "Unexpected empty result");
}
return addresses;
},
};
}
void RegisterOutputScriptRPCCommands(CRPCTable& t)
{
static const CRPCCommand commands[]{
{"util", &validateaddress},
{"util", &createmultisig},
{"util", &deriveaddresses},
{"util", &getdescriptorinfo},
};
for (const auto& c : commands) {
t.appendCommand(c.name, &c);
}
}
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