-
Notifications
You must be signed in to change notification settings - Fork 28
/
swap.cpp
699 lines (591 loc) · 36.6 KB
/
swap.cpp
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
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
#include <base58.h>
#include <wallet/coincontrol.h>
#include <consensus/params.h>
#include <policy/fees.h>
#include <policy/policy.h>
#include <script/script.h>
#include <crypto/sha256.h>
#include <serialize.h>
#include <rpc/server.h>
#include <univalue/include/univalue.h>
#include <util.h>
#include <rpc/util.h>
#include <timedata.h>
#include <primitives/transaction.h>
#include <validation.h>
#include <wallet/rpcwallet.h>
#include <wallet/fees.h>
#include <core_io.h>
static const int SECRET_SIZE = 32;
class SwapContract
{
public:
CScript contractRedeemscript;
CScriptID contractAddr;
CAmount contractFee;
CTransactionRef contactTx;
CTransactionRef refundTx;
CAmount refundFee;
};
static const int redeemAtomicSwapSigScriptSize = 1 + 73 + 1 + 33 + 1 + 32 + 1;
static const int refundAtomicSwapSigScriptSize = 1 + 73 + 1 + 33 + 1;
int CalcInputSize(int scriptSigSize)
{
return 32 + 4 + ::GetSerializeSize(VARINT(scriptSigSize), 0, 0) + scriptSigSize + 4;
}
int EstimateRefundTxSerializeSize(const CScript& contractRedeemscript, std::vector<CTxOut> txOuts)
{
int outputsSerializeSize = 0;
for (const CTxOut& txout : txOuts) {
outputsSerializeSize += ::GetSerializeSize(txout, 0, 0);
}
return 4 + 4 + 4 + ::GetSerializeSize(VARINT(1), 0, 0) + ::GetSerializeSize(VARINT(txOuts.size()), 0, 0) + CalcInputSize(refundAtomicSwapSigScriptSize + contractRedeemscript.size()) + outputsSerializeSize;
}
int EstimateRedeemTxSerializeSize(const CScript& contractRedeemscript, std::vector<CTxOut> txOuts)
{
int outputsSerializeSize = 0;
for (const CTxOut& txout : txOuts) {
outputsSerializeSize += ::GetSerializeSize(txout, 0, 0);
}
return 4 + 4 + 4 + ::GetSerializeSize(VARINT(1), 0, 0) + ::GetSerializeSize(VARINT(txOuts.size()), 0, 0) + CalcInputSize(redeemAtomicSwapSigScriptSize + contractRedeemscript.size()) + outputsSerializeSize;
}
bool TryDecodeAtomicSwapScript(const CScript& contractRedeemscript,
std::vector<unsigned char>& secretHash, CKeyID& recipient, CKeyID& refund, int64_t& locktime, int64_t& secretSize)
{
CScript::const_iterator pc = contractRedeemscript.begin();
opcodetype opcode;
std::vector<unsigned char> secretSizeData;
std::vector<unsigned char> locktimeData;
std::vector<unsigned char> recipientHash;
std::vector<unsigned char> refundHash;
if ((contractRedeemscript.GetOp(pc, opcode) && opcode == OP_IF) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_SIZE) &&
(contractRedeemscript.GetOp(pc, opcode, secretSizeData)) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_EQUALVERIFY) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_SHA256) &&
(contractRedeemscript.GetOp(pc, opcode, secretHash) && opcode == 0x20) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_EQUALVERIFY) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_DUP) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_HASH160) &&
(contractRedeemscript.GetOp(pc, opcode, recipientHash) && opcode == 0x14) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_ELSE) &&
(contractRedeemscript.GetOp(pc, opcode, locktimeData)) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_CHECKLOCKTIMEVERIFY) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_DROP) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_DUP) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_HASH160) &&
(contractRedeemscript.GetOp(pc, opcode, refundHash) && opcode == 0x14) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_ENDIF) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_EQUALVERIFY) &&
(contractRedeemscript.GetOp(pc, opcode) && opcode == OP_CHECKSIG)
) {
secretSize = CScriptNum(secretSizeData, true).getint();
locktime = CScriptNum(locktimeData, true).getint();
recipient = CKeyID(uint160(recipientHash));
refund = CKeyID(uint160(refundHash));
return true;
}
return false;
}
bool CreateRefundSigScript(CWallet* pwallet, const CScript& contractRedeemscript, const CScript contractPubKeyScript, const CKeyID& address, CMutableTransaction& refundTx, CAmount amount, CScript& refundSigScript)
{
MutableTransactionSignatureCreator creator(pwallet, &refundTx, 0, amount, SIGHASH_ALL|SIGHASH_FORKID);
std::vector<unsigned char> vch;
CPubKey pubKey;
if (!creator.CreateSig(vch, address, pubKey, contractRedeemscript, SIGVERSION_BASE)) {
return false;
}
refundSigScript = CScript() << vch << ToByteVector(pubKey) << int64_t(0) << std::vector<unsigned char>(contractRedeemscript.begin(), contractRedeemscript.end());
return VerifyScript(refundSigScript, contractPubKeyScript, nullptr, STANDARD_SCRIPT_VERIFY_FLAGS, creator.Checker());
}
bool CreateRedeemSigScript(CWallet* pwallet, const CScript& contractRedeemscript, const CScript contractPubKeyScript, const CKeyID& address, const std::vector<unsigned char>& secret, CMutableTransaction& redeemTx, CAmount amount, CScript& redeemSigScript)
{
MutableTransactionSignatureCreator creator(pwallet, &redeemTx, 0, amount, SIGHASH_ALL|SIGHASH_FORKID);
std::vector<unsigned char> vch;
CPubKey pubKey;
if (!creator.CreateSig(vch, address, pubKey, contractRedeemscript, SIGVERSION_BASE)) {
return false;
}
redeemSigScript = CScript() << vch << ToByteVector(pubKey) << secret << int64_t(1) << std::vector<unsigned char>(contractRedeemscript.begin(), contractRedeemscript.end());
return VerifyScript(redeemSigScript, contractPubKeyScript, nullptr, STANDARD_SCRIPT_VERIFY_FLAGS, creator.Checker());
}
void BuildRefundTransaction(CWallet* pwallet, const CScript& contractRedeemscript, const CMutableTransaction& contractTx, CMutableTransaction& refundTx, CAmount& refundFee)
{
std::vector<unsigned char> secretHash;
CKeyID recipient;
CKeyID refundAddr;
int64_t locktime;
int64_t secretSize;
if (!TryDecodeAtomicSwapScript(contractRedeemscript, secretHash, recipient, refundAddr, locktime, secretSize)) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Invalid atomic swap script");
}
CScriptID swapContractAddr = CScriptID(contractRedeemscript);
CScript contractPubKeyScript = GetScriptForDestination(swapContractAddr);
COutPoint contractOutPoint;
contractOutPoint.hash = contractTx.GetHash();
for (size_t i = 0; i < contractTx.vout.size(); i++) {
if (contractTx.vout[i].scriptPubKey.size() == contractPubKeyScript.size() &&
std::equal(contractPubKeyScript.begin(), contractPubKeyScript.end(), contractTx.vout[i].scriptPubKey.begin())) {
contractOutPoint.n = i;
break;
}
}
if (contractOutPoint.n == (uint32_t) -1) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Contract tx does not contain a P2SH contract payment");
}
//create refund transaction
CTxDestination refundAddress = GetRawChangeAddress(pwallet, OUTPUT_TYPE_LEGACY);
CScript refundPubkeyScript = GetScriptForDestination(refundAddress);
refundTx.nLockTime = locktime;
refundTx.vout.push_back(CTxOut(0, refundPubkeyScript));
int refundTxSize = EstimateRefundTxSerializeSize(contractRedeemscript, refundTx.vout);
CCoinControl coinControl;
refundFee = GetMinimumFee(refundTxSize, coinControl, ::mempool, ::feeEstimator, nullptr);
refundTx.vout[0].nValue = contractTx.vout[contractOutPoint.n].nValue - refundFee;
if (IsDust(refundTx.vout[0], ::dustRelayFee)) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, strprintf("Redeem output value of %d is dust", refundTx.vout[0].nValue));
}
CTxIn txIn(contractOutPoint);
txIn.nSequence = 0;
refundTx.vin.push_back(txIn);
CScript refundSigScript;
if (!CreateRefundSigScript(pwallet, contractRedeemscript, contractPubKeyScript, refundAddr, refundTx, contractTx.vout[contractOutPoint.n].nValue, refundSigScript)) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Failed to create refund script signature");
}
refundTx.vin[0].scriptSig = refundSigScript;
}
void BuildContract(SwapContract& contract, CWallet* pwallet, CKeyID dest, CAmount nAmount, int64_t locktime, std::vector<unsigned char> secretHash)
{
LOCK2(cs_main, pwallet->cs_wallet);
CTxDestination refundDest = GetRawChangeAddress(pwallet, OUTPUT_TYPE_LEGACY);
CKeyID refundAddress = boost::get<CKeyID>(refundDest);
CScript contractRedeemscript = CreateAtomicSwapRedeemscript(refundAddress, dest, locktime, SECRET_SIZE, secretHash);
CScriptID swapContractAddr = CScriptID(contractRedeemscript);
CScript contractPubKeyScript = GetScriptForDestination(swapContractAddr);
CReserveKey reservekey(pwallet);
CAmount nFeeRequired;
std::string strError;
std::vector<CRecipient> vecSend;
int nChangePosRet = -1;
CRecipient recipient = {contractPubKeyScript, nAmount, false};
vecSend.push_back(recipient);
CCoinControl coinControl;
coinControl.change_type = OUTPUT_TYPE_LEGACY;
CWalletTx wtx;
if (!pwallet->CreateTransaction(vecSend, wtx, reservekey, nFeeRequired, nChangePosRet, strError, coinControl)) {
throw JSONRPCError(RPC_WALLET_ERROR, strError);
}
CMutableTransaction refundTx;
CAmount refundFee;
BuildRefundTransaction(pwallet, contractRedeemscript, CMutableTransaction(*wtx.tx), refundTx, refundFee);
contract.contractRedeemscript = contractRedeemscript;
contract.contractAddr = swapContractAddr;
contract.contactTx = wtx.tx;
contract.contractFee = nFeeRequired;
contract.refundTx = MakeTransactionRef(std::move(refundTx));
contract.refundFee = refundFee;
}
void GenerateSecret(std::vector<unsigned char>& secret, std::vector<unsigned char>& secretHash)
{
secret.assign(SECRET_SIZE, 0);
secretHash.assign(CSHA256::OUTPUT_SIZE, 0);
GetRandBytes(secret.data(), secret.size());
CSHA256 sha;
sha.Write(secret.data(), secret.size());
sha.Finalize(secretHash.data());
}
UniValue SwapTxToUniv(const CTransactionRef& tx)
{
UniValue res(UniValue::VOBJ);
res.push_back(Pair("txid", tx->GetHash().GetHex()));
res.push_back(Pair("hex", EncodeHexTx(*tx, RPCSerializationFlags())));
return res;
}
void SwapContractToUniv(const SwapContract& contract, UniValue& res)
{
UniValue c(UniValue::VOBJ);
c.push_back(Pair("address", EncodeDestination(contract.contractAddr)));
c.push_back(Pair("scriptHex", HexStr(contract.contractRedeemscript.begin(), contract.contractRedeemscript.end())));
res.push_back(Pair("contract", c));
UniValue contractData = SwapTxToUniv(contract.contactTx);
contractData.push_back(Pair("fee", ValueFromAmount(contract.contractFee)));
res.push_back(Pair("contractTx", contractData));
UniValue refundData = SwapTxToUniv(contract.refundTx);
refundData.push_back(Pair("fee", ValueFromAmount(contract.refundFee)));
res.push_back(Pair("refundTx", refundData));
}
UniValue initiateswap(const JSONRPCRequest& request)
{
CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
return NullUniValue;
}
if (request.fHelp || request.params.size() != 2)
throw std::runtime_error(
"initiateswap \"address\" amount\n"
"\nThe initiateswap command is performed by the initiator to create the first contract.\n"
+ HelpRequiringPassphrase(pwallet) +
"\nArgumets:\n"
"1. \"address\" (string, required) The recipient address\n"
"2. amount (numeric, required) The value for the swap\n"
"\nResult:\n"
"{\n"
" \"secret\" (string) The hex-encoded secret for redemption\n"
" \"secretHash\" (string) The hex-encoded hash of redemption secret\n"
" \"contract\": { (json object) The contract for swap \n"
" \"address\" (string) The Atom address of the swap contract\n"
" \"scriptHex\" (string) The contract hex script\n"
" }\n"
" \"contractTx\": { (json object) The contract transaction\n"
" \"txid\" (string) The contract transaction id encoded in little-endian hexadecimal\n"
" \"hex\" (string) The hex-encoded raw transaction with signature(s)\n"
" \"fee\" (numeric) The amount of the contract transaction fee in BTC\n"
" }\n"
" \"refundTx\": { (json object) The transaction for refund\n"
" \"txid\" (string) The refund transaction id encoded in little-endian hexadecimal\n"
" \"hex\" (string) The hex-encoded refund transaction with signature(s)\n"
" \"fee\" (numeric) The amount of the refund transaction fee in BTC\n"
" }\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("initiateswap", "\"mh2nu899jinDFF3XEANbhWXL4RAL5JYDnv\" 1")
+ HelpExampleRpc("initiateswap", "\"mh2nu899jinDFF3XEANbhWXL4RAL5JYDnv\" 1")
);
CTxDestination dest = DecodeDestination(request.params[0].get_str());
if (dest.which() != 1) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Participant address is not P2PKH");
}
CAmount nAmount = AmountFromValue(request.params[1]);
if (nAmount <= 0) {
throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
}
EnsureWalletIsUnlocked(pwallet);
CKeyID destAddress = boost::get<CKeyID>(dest);
int64_t locktime = GetAdjustedTime() + 48 * 60 * 60;
std::vector<unsigned char> secret, secretHash;
GenerateSecret(secret, secretHash);
SwapContract contract;
BuildContract(contract, pwallet, destAddress, nAmount, locktime, secretHash);
UniValue res(UniValue::VOBJ);
res.push_back(Pair("secret", HexStr(secret.begin(), secret.end())));
res.push_back(Pair("secretHash", HexStr(secretHash.begin(), secretHash.end())));
SwapContractToUniv(contract, res);
return res;
}
UniValue auditswap(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() != 2)
throw std::runtime_error(
"auditswap \"hexscript\" \"hextransaction\"\n"
"\nThe auditswap command inspects a contract script and parses out the addresses that may claim the output, the locktime, and the secret hash. It also validates that the contract transaction pays to the contract and reports the contract output amount. Each party should audit the contract provided by the other to verify that their address is the recipient address, the output value is correct, and that the locktime is sensible.\n"
"\nArgumets:\n"
"1. \"hexscript\" (string, required) The hex-encoded contract\n"
"2. \"hextransaction\" (string, required) The hex-encoded contract transaction\n"
"\nResult:\n"
"{\n"
" \"contractAddress\" (string) The Atom address of the swap contract\n"
" \"contractValue\" (numeric) The value for the swap\n"
" \"recipientAddress\" (string) The recipient address\n"
" \"refundAddress\" (string) The address for refund\n"
" \"secretHash\" (string) The hash of redemption secret\n"
" \"locktime\" (numeric) The time for refund unlock\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("auditswap", "\"6382012088a82085a6637bfc298b2623b94bfeacc8d491edfa0abf3d8bb1c0f2d3b5fa58ad17158876a914109cc30524c19942078ba4356d88e6ef2aa71b546704d408da5ab17576a91423905458d1f6ed5c1efdcf87c9e4e1bc4e57a7796888ac\" \"02000000000101ddbd704186145cc9dcd0b5356d3480efe9b70cf4f2b7d9c919bc6eb506724b0100000000171600143986c86ad67c57f62174d48f159f9de554ba1138feffffff02e0d3f505000000001976a914c929fc3aad535e0d60bb416cc4294a757e31743788ac00e1f5050000000017a91471301e862d2a4e3f01bac5d9255c4d4d81331d7a8702473044022039527fbf8e0a5926d5282138617e1efaec5b2324ddf907623fb185e278b7b71e02203ca51954c1bbccd53927015a384c0236fc5ed2ed5a977adbddaa1c5f7528208a4121022e2622378dc8b9395be551ebaec071fe16ea705d9b018bdecb92ac57e6152e85742d1400\"")
+ HelpExampleRpc("auditswap", "\"6382012088a82085a6637bfc298b2623b94bfeacc8d491edfa0abf3d8bb1c0f2d3b5fa58ad17158876a914109cc30524c19942078ba4356d88e6ef2aa71b546704d408da5ab17576a91423905458d1f6ed5c1efdcf87c9e4e1bc4e57a7796888ac\" \"02000000000101ddbd704186145cc9dcd0b5356d3480efe9b70cf4f2b7d9c919bc6eb506724b0100000000171600143986c86ad67c57f62174d48f159f9de554ba1138feffffff02e0d3f505000000001976a914c929fc3aad535e0d60bb416cc4294a757e31743788ac00e1f5050000000017a91471301e862d2a4e3f01bac5d9255c4d4d81331d7a8702473044022039527fbf8e0a5926d5282138617e1efaec5b2324ddf907623fb185e278b7b71e02203ca51954c1bbccd53927015a384c0236fc5ed2ed5a977adbddaa1c5f7528208a4121022e2622378dc8b9395be551ebaec071fe16ea705d9b018bdecb92ac57e6152e85742d1400\"")
);
std::vector<unsigned char> scriptData(ParseHexV(request.params[0], "hexscript"));
CScript contractRedeemscript = CScript(scriptData.begin(), scriptData.end());
CMutableTransaction tx;
if (!DecodeHexTx(tx, request.params[1].get_str(), true)) {
throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Failed to decode contract transaction");
}
CScriptID contractAddr = CScriptID(contractRedeemscript);
int contractOutIndex = -1;
for (size_t i = 0; i < tx.vout.size(); i++) {
const CTxOut& txout = tx.vout[i];
txnouttype type;
std::vector<CTxDestination> vDest;
int nRequired;
if (!ExtractDestinations(txout.scriptPubKey, type, vDest, nRequired) || type != TX_SCRIPTHASH) {
continue;
}
if (*boost::get<CScriptID>(&vDest[0]) == contractAddr) {
contractOutIndex = i;
break;
}
}
if (contractOutIndex == -1) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Transaction does not contain the contract output");
}
std::vector<unsigned char> secretHash;
CKeyID recipient;
CKeyID refundAddr;
int64_t locktime;
int64_t secretSize;
if (!TryDecodeAtomicSwapScript(contractRedeemscript, secretHash, recipient, refundAddr, locktime, secretSize)) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Invalid atomic swap script");
}
if (secretSize != SECRET_SIZE) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, strprintf("Incorrect secret size: %d", secretSize));
}
UniValue res(UniValue::VOBJ);
res.push_back(Pair("contractAddress", EncodeDestination(contractAddr)));
res.push_back(Pair("contractValue", ValueFromAmount(tx.vout[contractOutIndex].nValue)));
res.push_back(Pair("recipientAddress", EncodeDestination(recipient)));
res.push_back(Pair("refundAddress", EncodeDestination(refundAddr)));
res.push_back(Pair("secretHash", HexStr(secretHash.begin(), secretHash.end())));
res.push_back(Pair("locktime", locktime));
return res;
}
UniValue participateswap(const JSONRPCRequest& request)
{
CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
return NullUniValue;
}
if (request.fHelp || request.params.size() != 3)
throw std::runtime_error(
"participateswap \"address\" amount \"secrethash\"\n"
"\nThe participateswap command is performed by the participant to create a contract on the second blockchain. It operates similarly to initiate but requires using the secret hash from the initiator's contract and creates the contract with a locktime of 24 hours.\n"
+ HelpRequiringPassphrase(pwallet) +
"\nArgumets:\n"
"1. \"address\" (string, required) The recipient address\n"
"2. amount (numeric, required) The value for the swap\n"
"3. \"secrethash\" (string, required) The hex-encoded hash of redemption secret\n"
"\nResult:\n"
"{\n"
" \"contract\": { (json object) The contract for swap \n"
" \"address\" (string) The Atom address of the swap contract\n"
" \"scriptHex\" (string) The hex-encoded contract\n"
" }\n"
" \"contractTx\": { (json object) The contract transaction\n"
" \"txid\" (string) The contract transaction id encoded in little-endian hexadecimal\n"
" \"hex\" (string) The hex-encoded contract transaction\n"
" \"fee\" (numeric) The amount of the contract transaction fee in BTC\n"
" }\n"
" \"refundTx\": { (json object) The transaction for refund\n"
" \"txid\" (string) The refund transaction id encoded in little-endian hexadecimal\n"
" \"hex\" (string) The hex-encoded refund transaction\n"
" \"fee\" (numeric) The amount of the refund transaction fee in BTC\n"
" }\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("participateswap", "\"mxhBqMzeFc4N6ugGFMi5A4gRGD6yZ7HsW5\" 2 \"3fbf99fcb5690013e742991b5d43f62ac897ecb8494a33feaf6f76ff16b66d9f\"")
+ HelpExampleRpc("participateswap", "\"mxhBqMzeFc4N6ugGFMi5A4gRGD6yZ7HsW5\" 2 \"3fbf99fcb5690013e742991b5d43f62ac897ecb8494a33feaf6f76ff16b66d9f\"")
);
CTxDestination dest = DecodeDestination(request.params[0].get_str());
if (dest.which() != 1) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Participant address is not P2PKH");
}
CAmount nAmount = AmountFromValue(request.params[1]);
if (nAmount <= 0) {
throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
}
std::vector<unsigned char> secretHash(ParseHexV(request.params[2], "secrethash"));
if (secretHash.size() != CSHA256::OUTPUT_SIZE) {
throw JSONRPCError(RPC_TYPE_ERROR, "Secret hash has wrong size");
}
EnsureWalletIsUnlocked(pwallet);
CKeyID destAddress = boost::get<CKeyID>(dest);
int64_t locktime = GetAdjustedTime() + 24 * 60 * 60;
SwapContract contract;
BuildContract(contract, pwallet, destAddress, nAmount, locktime, secretHash);
UniValue res(UniValue::VOBJ);
SwapContractToUniv(contract, res);
return res;
}
UniValue redeemswap(const JSONRPCRequest& request)
{
CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
return NullUniValue;
}
if (request.fHelp || request.params.size() != 3)
throw std::runtime_error(
"redeemswap \"hexscript\" \"hextransaction\" \"secret\"\n"
"\nThe redeemswap command is performed by both parties to redeem coins paid into the contract created by the other party. Redeeming requires the secret and must be performed by the initiator first. Once the initiator's redemption has been published, the secret may be extracted from the transaction and the participant may also redeem their coins.\n"
+ HelpRequiringPassphrase(pwallet) +
"\nArgumets:\n"
"1. \"hexscript\" (string, required) The hex-encoded contract\n"
"2. \"hextransaction\" (string, required) The hex-encoded contract transaction\n"
"3. \"secret\" (string, required) The hex-encoded secret for redemption\n"
"\nResult:\n"
"{\n"
" \"txid\" (string) The redemption transaction id encoded in little-endian hexadecimal\n"
" \"hex\" (string) The hex-encoded redemption transaction\n"
" \"Redeem fee\" (numeric) The amount of the redeem transaction fee in BTC\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("redeemswap", "\"6382012088a82085a6637bfc298b2623b94bfeacc8d491edfa0abf3d8bb1c0f2d3b5fa58ad17158876a914109cc30524c19942078ba4356d88e6ef2aa71b546704d408da5ab17576a91423905458d1f6ed5c1efdcf87c9e4e1bc4e57a7796888ac\" \"02000000000101ddbd704186145cc9dcd0b5356d3480efe9b70cf4f2b7d9c919bc6eb506724b0100000000171600143986c86ad67c57f62174d48f159f9de554ba1138feffffff02e0d3f505000000001976a914c929fc3aad535e0d60bb416cc4294a757e31743788ac00e1f5050000000017a91471301e862d2a4e3f01bac5d9255c4d4d81331d7a8702473044022039527fbf8e0a5926d5282138617e1efaec5b2324ddf907623fb185e278b7b71e02203ca51954c1bbccd53927015a384c0236fc5ed2ed5a977adbddaa1c5f7528208a4121022e2622378dc8b9395be551ebaec071fe16ea705d9b018bdecb92ac57e6152e85742d1400\" \"50ab577bd16fc7e4446ac94dbf0020da01a9e31c2b3e8cccb842f5ce284f671e\"")
+ HelpExampleRpc("redeemswap", "\"6382012088a82085a6637bfc298b2623b94bfeacc8d491edfa0abf3d8bb1c0f2d3b5fa58ad17158876a914109cc30524c19942078ba4356d88e6ef2aa71b546704d408da5ab17576a91423905458d1f6ed5c1efdcf87c9e4e1bc4e57a7796888ac\" \"02000000000101ddbd704186145cc9dcd0b5356d3480efe9b70cf4f2b7d9c919bc6eb506724b0100000000171600143986c86ad67c57f62174d48f159f9de554ba1138feffffff02e0d3f505000000001976a914c929fc3aad535e0d60bb416cc4294a757e31743788ac00e1f5050000000017a91471301e862d2a4e3f01bac5d9255c4d4d81331d7a8702473044022039527fbf8e0a5926d5282138617e1efaec5b2324ddf907623fb185e278b7b71e02203ca51954c1bbccd53927015a384c0236fc5ed2ed5a977adbddaa1c5f7528208a4121022e2622378dc8b9395be551ebaec071fe16ea705d9b018bdecb92ac57e6152e85742d1400\" \"50ab577bd16fc7e4446ac94dbf0020da01a9e31c2b3e8cccb842f5ce284f671e\"")
);
std::vector<unsigned char> contract(ParseHexV(request.params[0], "hexscript"));
CMutableTransaction contractTx;
if (!DecodeHexTx(contractTx, request.params[1].get_str(), true)) {
throw JSONRPCError(RPC_TYPE_ERROR, "Failed to decode contract transaction");
}
std::vector<unsigned char> secret(ParseHexV(request.params[2], "secret"));
if (secret.size() != SECRET_SIZE) {
throw JSONRPCError(RPC_TYPE_ERROR, "Secret has wrong size");
}
EnsureWalletIsUnlocked(pwallet);
std::vector<unsigned char> secretHash;
CKeyID recipient;
CKeyID refund;
int64_t locktime;
int64_t secretSize;
CScript contractRedeemScript(contract.begin(), contract.end());
CScriptID swapContractAddr = CScriptID(contractRedeemScript);
CScript contractPubKeyScript = GetScriptForDestination(swapContractAddr);
if (!TryDecodeAtomicSwapScript(contractRedeemScript, secretHash, recipient, refund, locktime, secretSize)) {
throw JSONRPCError(RPC_TYPE_ERROR, "Contract is not an atomic swap script recognized by this tool");
}
CScriptID contractAddr = CScriptID(contractRedeemScript);
int contractOutIndex = -1;
for (size_t i = 0; i < contractTx.vout.size(); i++) {
const CTxOut& txout = contractTx.vout[i];
txnouttype type;
std::vector<CTxDestination> vDest;
int nRequired;
if (!ExtractDestinations(txout.scriptPubKey, type, vDest, nRequired) || type != TX_SCRIPTHASH) {
continue;
}
if (*boost::get<CScriptID>(&vDest[0]) == contractAddr) {
contractOutIndex = i;
break;
}
}
if (contractOutIndex == -1) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Transaction does not contain the contract output");
}
COutPoint contractOutPoint;
contractOutPoint.hash = contractTx.GetHash();
contractOutPoint.n = contractOutIndex;
LOCK2(cs_main, pwallet->cs_wallet);
CTxDestination addr = GetRawChangeAddress(pwallet, OUTPUT_TYPE_LEGACY);
CScript outScript = GetScriptForDestination(addr);
CMutableTransaction redeemTx;
redeemTx.nLockTime = locktime;
redeemTx.vout.push_back(CTxOut(0, outScript));
CTxIn txIn(contractOutPoint);
redeemTx.vin.push_back(txIn);
int redeemTxSize = EstimateRedeemTxSerializeSize(contractRedeemScript, redeemTx.vout);
CCoinControl coinControl;
CAmount redeemFee = GetMinimumFee(redeemTxSize, coinControl, ::mempool, ::feeEstimator, nullptr);
redeemTx.vout[0].nValue = contractTx.vout[contractOutPoint.n].nValue - redeemFee;
if (IsDust(redeemTx.vout[0], ::dustRelayFee)) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, strprintf("Redeem output value of %d is dust", redeemTx.vout[0].nValue));
}
CScript redeemSigScript;
if (!CreateRedeemSigScript(pwallet, contractRedeemScript, contractPubKeyScript, recipient, secret, redeemTx, contractTx.vout[contractOutPoint.n].nValue, redeemSigScript)) {
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Failed to create redeem script signature");
}
redeemTx.vin[0].scriptSig = redeemSigScript;
UniValue res = SwapTxToUniv(MakeTransactionRef(std::move(redeemTx)));
res.push_back(Pair("Redeem fee", ValueFromAmount(redeemFee)));
return res;
}
UniValue extractsecret(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() != 2)
throw std::runtime_error(
"extractsecret \"hextransaction\" \"secrethash\"\n"
"\nThe extractsecret command is used by the participant to extract the secret from the initiator's redemption transaction. With the secret known, the participant may claim the coins paid into the initiator's contract.\n"
"\nArgumets:\n"
"1. \"hextransaction\" (string, required) The hex-encoded redemption transaction\n"
"2. \"secrethash\" (string, required) The hex-encoded hash of redemption secret\n"
"\nResult:\n"
"{\n"
" \"secret\" (string) The hex-encoded secret for redemption\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("extractsecret", "\"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\" \"3fbf99fcb5690013e742991b5d43f62ac897ecb8494a33feaf6f76ff16b66d9f\"")
+ HelpExampleRpc("extractsecret", "\"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\" \"3fbf99fcb5690013e742991b5d43f62ac897ecb8494a33feaf6f76ff16b66d9f\"")
);
CMutableTransaction tx;
if (!DecodeHexTx(tx, request.params[0].get_str(), true)) {
throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Failed to decode redemption transaction");
}
std::vector<unsigned char> secretHash(ParseHexV(request.params[1], "secrethash"));
if (secretHash.size() != CSHA256::OUTPUT_SIZE) {
throw JSONRPCError(RPC_TYPE_ERROR, "Secret hash has wrong size");
}
CSHA256 sha;
for (const CTxIn txin : tx.vin) {
CScript::const_iterator pc = txin.scriptSig.begin();
std::vector<unsigned char> data, secretHashCalculated(CSHA256::OUTPUT_SIZE, 0);
while (pc < txin.scriptSig.end())
{
opcodetype opcode;
if (!txin.scriptSig.GetOp(pc, opcode, data)) {
break;
}
if (data.size() != 0) {
sha.Write(data.data(), data.size());
sha.Finalize(secretHashCalculated.data());
sha.Reset();
if (std::equal(secretHashCalculated.begin(), secretHashCalculated.end(), secretHash.begin())) {
UniValue res(UniValue::VOBJ);
res.push_back(Pair("secret", HexStr(data.begin(), data.end())));
return res;
}
}
}
}
throw JSONRPCError(RPC_TRANSACTION_ERROR, "Transaction does not contain the secret");
}
UniValue refundswap(const JSONRPCRequest& request)
{
CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
return NullUniValue;
}
if (request.fHelp || request.params.size() != 2)
throw std::runtime_error(
"refundswap \"hexscript\" \"hextransaction\"\n"
"\nThe refundswap command is used to create and send a refund of a contract transaction. While the refund transaction is created and displayed during contract creation in the initiate and participate steps, the refund can also be created after the fact in case there was any issue sending the transaction (e.g. the contract transaction was malleated or the refund fee is now too low).\n"
+ HelpRequiringPassphrase(pwallet) +
"\nArgumets:\n"
"1. \"hexscript\" (string, required) The hex-encoded contract\n"
"2. \"hextransaction\" (string, required) The hex-encoded contract transaction\n"
"\nResult:\n"
"{\n"
" \"txid\" (string) The redemption transaction id encoded in little-endian hexadecimal\n"
" \"hex\" (string) The hex-encoded refund transaction with signature(s)\n"
" \"fee\" (numeric) The amount of the refund transaction fee in BTC\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("refundswap", "\"6382012088a82043098e913574fd73052dc4916c14641d2a7d3dc51de533e7ceb1ece447cd53018876a914bf5d762453cadfaa953ddbb334d2e9179c00c4e167041765d85ab17576a914c3c1bac44ebf6394cfc9dbaf22b13967193c2fdd6888ac\" \"02000000017d6299fc712683b1c383b15e98459561a2c1d1e554eda5ca0b6849ca96030185000000006b483045022100dfdd309af06493ae16b5f8b44bb1407639d964e4df1b7b3520b845b95731ef50022066305f28dcde0f9a28c961016408f603ce9d0d0ee1bc0ffcd250cd58baa867e141210310e244d5f11d7b6199c2e2b1099c864ec27556ff966c895612124c454c378e7ffeffffff0200b4c4040000000017a91449e1ee8259d8fe2f5fd733e0e1c7fa45cb0c8e9b87cce22607000000001976a914afbbf807011cc924043fdfc0f40ab8557f12a8dc88acdf2d1400\"")
+ HelpExampleRpc("refundswap", "\"6382012088a82043098e913574fd73052dc4916c14641d2a7d3dc51de533e7ceb1ece447cd53018876a914bf5d762453cadfaa953ddbb334d2e9179c00c4e167041765d85ab17576a914c3c1bac44ebf6394cfc9dbaf22b13967193c2fdd6888ac\" \"02000000017d6299fc712683b1c383b15e98459561a2c1d1e554eda5ca0b6849ca96030185000000006b483045022100dfdd309af06493ae16b5f8b44bb1407639d964e4df1b7b3520b845b95731ef50022066305f28dcde0f9a28c961016408f603ce9d0d0ee1bc0ffcd250cd58baa867e141210310e244d5f11d7b6199c2e2b1099c864ec27556ff966c895612124c454c378e7ffeffffff0200b4c4040000000017a91449e1ee8259d8fe2f5fd733e0e1c7fa45cb0c8e9b87cce22607000000001976a914afbbf807011cc924043fdfc0f40ab8557f12a8dc88acdf2d1400\"")
);
std::vector<unsigned char> scriptData(ParseHexV(request.params[0], "hexscript"));
CScript contractRedeemscript = CScript(scriptData.begin(), scriptData.end());
CMutableTransaction tx;
if (!DecodeHexTx(tx, request.params[1].get_str(), true)) {
throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Failed to decode contract transaction");
}
LOCK2(cs_main, pwallet->cs_wallet);
EnsureWalletIsUnlocked(pwallet);
CMutableTransaction refundTx;
CAmount refundFee;
BuildRefundTransaction(pwallet, contractRedeemscript, tx, refundTx, refundFee);
UniValue res = SwapTxToUniv(MakeTransactionRef(std::move(refundTx)));
res.push_back(Pair("fee", ValueFromAmount(refundFee)));
return res;
}
static const CRPCCommand commands[] =
{ // category name actor (function) argNames
// --------------------- ------------------------ ----------------------- ----------
{ "atomicswaps", "initiateswap", &initiateswap, {"address","amount"} },
{ "atomicswaps", "auditswap", &auditswap, {"hexscript","hextransaction"} },
{ "atomicswaps", "participateswap", &participateswap, {"address","amount","secrethash"} },
{ "atomicswaps", "redeemswap", &redeemswap, {"hexscript","hextransaction","secret"} },
{ "atomicswaps", "refundswap", &refundswap, {"hexscript","hextransaction"} },
{ "atomicswaps", "extractsecret", &extractsecret, {"hextransaction","secrethash"} },
};
void RegisterAtomicSwapRPCCommands(CRPCTable &t)
{
for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++)
t.appendCommand(commands[vcidx].name, &commands[vcidx]);
}