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Swap in descriptors support into scantxoutset

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pull/585/head
Pieter Wuille 6 years ago
parent 0652c3284f
commit 151600bb49
2 changed files with 49 additions and 125 deletions
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164
src/rpc/blockchain.cpp
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@ -20,6 +20,7 @@
#include <policy/policy.h>
#include <primitives/transaction.h>
#include <rpc/server.h>
#include <script/descriptor.h>
#include <streams.h>
#include <sync.h>
#include <txdb.h>
@ -1984,66 +1985,35 @@ public:
}
};
static const char *g_default_scantxoutset_script_types[] = { "P2PKH", "P2SH_P2WPKH", "P2WPKH" };
enum class OutputScriptType {
UNKNOWN,
P2PK,
P2PKH,
P2SH_P2WPKH,
P2WPKH
};
static inline OutputScriptType GetOutputScriptTypeFromString(const std::string& outputtype)
{
if (outputtype == "P2PK") return OutputScriptType::P2PK;
else if (outputtype == "P2PKH") return OutputScriptType::P2PKH;
else if (outputtype == "P2SH_P2WPKH") return OutputScriptType::P2SH_P2WPKH;
else if (outputtype == "P2WPKH") return OutputScriptType::P2WPKH;
else return OutputScriptType::UNKNOWN;
}
CTxDestination GetDestinationForKey(const CPubKey& key, OutputScriptType type)
{
switch (type) {
case OutputScriptType::P2PKH: return key.GetID();
case OutputScriptType::P2SH_P2WPKH:
case OutputScriptType::P2WPKH: {
if (!key.IsCompressed()) return key.GetID();
CTxDestination witdest = WitnessV0KeyHash(key.GetID());
if (type == OutputScriptType::P2SH_P2WPKH) {
CScript witprog = GetScriptForDestination(witdest);
return CScriptID(witprog);
} else {
return witdest;
}
}
default: assert(false);
}
}
UniValue scantxoutset(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
throw std::runtime_error(
"scantxoutset <action> ( <scanobjects> )\n"
"\nScans the unspent transaction output set for possible entries that matches common scripts of given public keys.\n"
"Using addresses as scanobjects will _not_ detect unspent P2PK txouts\n"
"\nScans the unspent transaction output set for entries that match certain output descriptors.\n"
"Examples of output descriptors are:\n"
" addr(<address>) Outputs whose scriptPubKey corresponds to the specified address (does not include P2PK)\n"
" raw(<hex script>) Outputs whose scriptPubKey equals the specified hex scripts\n"
" combo(<pubkey>) P2PK, P2PKH, P2WPKH, and P2SH-P2WPKH outputs for the given pubkey\n"
" pkh(<pubkey>) P2PKH outputs for the given pubkey\n"
" sh(multi(<n>,<pubkey>,<pubkey>,...)) P2SH-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 \"/\", and optionally ending in \"/*\" or \"/*'\" to specify all unhardened or hardened child keys.\n"
"In the latter case, a range needs to be specified by below if different from 1000.\n"
"For more information on output descriptors, see the documentation at TODO\n"
"\nArguments:\n"
"1. \"action\" (string, required) The action to execute\n"
" \"start\" for starting a scan\n"
" \"abort\" for aborting the current scan (returns true when abort was successful)\n"
" \"status\" for progress report (in %) of the current scan\n"
"2. \"scanobjects\" (array, optional) Array of scan objects (only one object type per scan object allowed)\n"
" [\n"
" { \"address\" : \"<address>\" }, (string, optional) Bitcoin address\n"
" { \"script\" : \"<scriptPubKey>\" }, (string, optional) HEX encoded script (scriptPubKey)\n"
" { \"pubkey\" : (object, optional) Public key\n"
" {\n"
" \"pubkey\" : \"<pubkey\">, (string, required) HEX encoded public key\n"
" \"script_types\" : [ ... ], (array, optional) Array of script-types to derive from the pubkey (possible values: \"P2PK\", \"P2PKH\", \"P2SH-P2WPKH\", \"P2WPKH\")\n"
" }\n"
"2. \"scanobjects\" (array, required) Array of scan objects\n"
" [ Every scan object is either a string descriptor or an object:\n"
" \"descriptor\", (string, optional) An output descriptor\n"
" { (object, optional) An object with output descriptor and metadata\n"
" \"desc\": \"descriptor\", (string, required) An output descriptor\n"
" \"range\": n, (numeric, optional) Up to what child index HD chains should be explored (default: 1000)\n"
" },\n"
" ...\n"
" ]\n"
"\nResult:\n"
"{\n"
@ -2090,79 +2060,35 @@ UniValue scantxoutset(const JSONRPCRequest& request)
// loop through the scan objects
for (const UniValue& scanobject : request.params[1].get_array().getValues()) {
if (!scanobject.isObject()) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid scan object");
}
UniValue address_uni = find_value(scanobject, "address");
UniValue pubkey_uni = find_value(scanobject, "pubkey");
UniValue script_uni = find_value(scanobject, "script");
// make sure only one object type is present
if (1 != !address_uni.isNull() + !pubkey_uni.isNull() + !script_uni.isNull()) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Only one object type is allowed per scan object");
} else if (!address_uni.isNull() && !address_uni.isStr()) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Scanobject \"address\" must contain a single string as value");
} else if (!pubkey_uni.isNull() && !pubkey_uni.isObject()) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Scanobject \"pubkey\" must contain an object as value");
} else if (!script_uni.isNull() && !script_uni.isStr()) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Scanobject \"script\" must contain a single string as value");
} else if (address_uni.isStr()) {
// type: address
// decode destination and derive the scriptPubKey
// add the script to the scan containers
CTxDestination dest = DecodeDestination(address_uni.get_str());
if (!IsValidDestination(dest)) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
}
CScript script = GetScriptForDestination(dest);
assert(!script.empty());
needles.insert(script);
} else if (pubkey_uni.isObject()) {
// type: pubkey
// derive script(s) according to the script_type parameter
UniValue script_types_uni = find_value(pubkey_uni, "script_types");
UniValue pubkeydata_uni = find_value(pubkey_uni, "pubkey");
// check the script types and use the default if not provided
if (!script_types_uni.isNull() && !script_types_uni.isArray()) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "script_types must be an array");
} else if (script_types_uni.isNull()) {
// use the default script types
script_types_uni = UniValue(UniValue::VARR);
for (const char *t : g_default_scantxoutset_script_types) {
script_types_uni.push_back(t);
}
}
// check the acctual pubkey
if (!pubkeydata_uni.isStr() || !IsHex(pubkeydata_uni.get_str())) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Public key must be hex encoded");
}
CPubKey pubkey(ParseHexV(pubkeydata_uni, "pubkey"));
if (!pubkey.IsFullyValid()) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid public key");
}
// loop through the script types and derive the script
for (const UniValue& script_type_uni : script_types_uni.get_array().getValues()) {
OutputScriptType script_type = GetOutputScriptTypeFromString(script_type_uni.get_str());
if (script_type == OutputScriptType::UNKNOWN) throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid script type");
CScript script;
if (script_type == OutputScriptType::P2PK) {
// support legacy P2PK scripts
script << ToByteVector(pubkey) << OP_CHECKSIG;
std::string desc_str;
int range = 1000;
if (scanobject.isStr()) {
desc_str = scanobject.get_str();
} else if (scanobject.isObject()) {
UniValue desc_uni = find_value(scanobject, "desc");
if (desc_uni.isNull()) throw JSONRPCError(RPC_INVALID_PARAMETER, "Descriptor needs to be provided in scan object");
desc_str = desc_uni.get_str();
UniValue range_uni = find_value(scanobject, "range");
if (!range_uni.isNull()) {
range = range_uni.get_int();
if (range < 0 || range > 1000000) throw JSONRPCError(RPC_INVALID_PARAMETER, "range out of range");
}
} else {
script = GetScriptForDestination(GetDestinationForKey(pubkey, script_type));
throw JSONRPCError(RPC_INVALID_PARAMETER, "Scan object needs to be either a string or an object");
}
FlatSigningProvider provider;
auto desc = Parse(desc_str, provider);
if (!desc) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Invalid descriptor '%s'", desc_str));
}
assert(!script.empty());
needles.insert(script);
if (!desc->IsRange()) range = 0;
for (int i = 0; i <= range; ++i) {
std::vector<CScript> scripts;
if (!desc->Expand(i, provider, scripts, provider)) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Cannot derive script without private keys: '%s'", desc_str));
}
} else if (script_uni.isStr()) {
// type: script
// check and add the script to the scan containers (needles array)
CScript script(ParseHexV(script_uni, "script"));
// TODO: check script: max length, has OP, is unspenable etc.
needles.insert(script);
needles.insert(scripts.begin(), scripts.end());
}
}

8
test/functional/rpc_scantxoutset.py
Unescape View File

@ -36,13 +36,11 @@ class ScantxoutsetTest(BitcoinTestFramework):
self.restart_node(0, ['-nowallet'])
self.log.info("Test if we have found the non HD unspent outputs.")
assert_equal(self.nodes[0].scantxoutset("start", [ {"pubkey": {"pubkey": pubk1}}, {"pubkey": {"pubkey": pubk2}}, {"pubkey": {"pubkey": pubk3}}])['total_amount'], 6)
assert_equal(self.nodes[0].scantxoutset("start", [ {"address": addr_P2SH_SEGWIT}, {"address": addr_LEGACY}, {"address": addr_BECH32}])['total_amount'], 6)
assert_equal(self.nodes[0].scantxoutset("start", [ {"address": addr_P2SH_SEGWIT}, {"address": addr_LEGACY}, {"pubkey": {"pubkey": pubk3}} ])['total_amount'], 6)
assert_equal(self.nodes[0].scantxoutset("start", [ "combo(" + pubk1 + ")", "combo(" + pubk2 + ")", "combo(" + pubk3 + ")"])['total_amount'], 6)
assert_equal(self.nodes[0].scantxoutset("start", [ "addr(" + addr_P2SH_SEGWIT + ")", "addr(" + addr_LEGACY + ")", "addr(" + addr_BECH32 + ")"])['total_amount'], 6)
assert_equal(self.nodes[0].scantxoutset("start", [ "addr(" + addr_P2SH_SEGWIT + ")", "addr(" + addr_LEGACY + ")", "combo(" + pubk3 + ")"])['total_amount'], 6)
self.log.info("Test invalid parameters.")
assert_raises_rpc_error(-8, 'Scanobject "pubkey" must contain an object as value', self.nodes[0].scantxoutset, "start", [ {"pubkey": pubk1}]) #missing pubkey object
assert_raises_rpc_error(-8, 'Scanobject "address" must contain a single string as value', self.nodes[0].scantxoutset, "start", [ {"address": {"address": addr_P2SH_SEGWIT}}]) #invalid object for address object
if __name__ == '__main__':
ScantxoutsetTest().main()

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