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import { BufferReader, BufferWriter } from '@node-dlc/bufio';
import { hash160 } from '@node-dlc/crypto';
import { BitcoinNetwork } from 'bitcoin-networks';
import { address } from 'bitcoinjs-lib';
import secp256k1 from 'secp256k1';
import { MessageType, PROTOCOL_VERSION } from '../MessageType';
import { deserializeTlv } from '../serialize/deserializeTlv';
import { getTlv } from '../serialize/getTlv';
import { bigIntToNumber, toBigInt } from '../util';
import { BatchFundingGroup, IBatchFundingGroupJSON } from './BatchFundingGroup';
import {
ContractInfo,
IDisjointContractInfoJSON,
ISingleContractInfoJSON,
} from './ContractInfo';
import { IDlcMessage } from './DlcMessage';
import { FundingInput, IFundingInputJSON } from './FundingInput';
import {
IOrderIrcInfoJSON,
OrderIrcInfo,
OrderIrcInfoV0,
} from './OrderIrcInfo';
import {
IOrderMetadataJSON,
OrderMetadata,
OrderMetadataV0,
} from './OrderMetadata';
import { IOrderPositionInfoJSON, OrderPositionInfo } from './OrderPositionInfo';
export const LOCKTIME_THRESHOLD = 500000000;
/**
* DlcOffer message contains information about a node and indicates its
* desire to enter into a new contract. This is the first step toward
* creating the funding transaction and CETs.
* Updated to support dlcspecs PR #163 format.
*/
export class DlcOffer implements IDlcMessage {
public static type = MessageType.DlcOffer;
/**
* Creates a DlcOffer from JSON data (e.g., from test vectors)
* Handles both our internal format and external test vector formats
* @param json JSON object representing a DLC offer
*/
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
public static fromJSON(json: any): DlcOffer {
const instance = new DlcOffer();
// Basic fields with field name variations
instance.protocolVersion =
json.protocolVersion || json.protocol_version || PROTOCOL_VERSION;
instance.contractFlags = Buffer.from(
json.contractFlags || json.contract_flags || '00',
'hex',
);
instance.chainHash = Buffer.from(json.chainHash || json.chain_hash, 'hex');
instance.temporaryContractId = Buffer.from(
json.temporaryContractId || json.temporary_contract_id,
'hex',
);
instance.fundingPubkey = Buffer.from(
json.fundingPubkey || json.fundingPubKey || json.funding_pubkey,
'hex',
);
instance.payoutSpk = Buffer.from(
json.payoutSpk || json.payoutSPK || json.payout_spk,
'hex',
);
// Use toBigInt helper to handle BigInt values from json-bigint
instance.payoutSerialId = toBigInt(
json.payoutSerialId || json.payout_serial_id,
);
instance.offerCollateral = toBigInt(
json.offerCollateral ||
json.offerCollateralSatoshis ||
json.offer_collateral,
);
instance.changeSpk = Buffer.from(
json.changeSpk || json.changeSPK || json.change_spk,
'hex',
);
instance.changeSerialId = toBigInt(
json.changeSerialId || json.change_serial_id,
);
instance.fundOutputSerialId = toBigInt(
json.fundOutputSerialId || json.fund_output_serial_id,
);
instance.feeRatePerVb = toBigInt(json.feeRatePerVb || json.fee_rate_per_vb);
instance.cetLocktime = json.cetLocktime || json.cet_locktime || 0;
instance.refundLocktime = json.refundLocktime || json.refund_locktime || 0;
// Use ContractInfo.fromJSON() - proper delegation
instance.contractInfo = ContractInfo.fromJSON(
json.contractInfo || json.contract_info,
);
// Use FundingInput.fromJSON() for each funding input - proper delegation
instance.fundingInputs = (json.fundingInputs || json.funding_inputs || [])
// eslint-disable-next-line @typescript-eslint/no-explicit-any
.map((inputJson: any) => FundingInput.fromJSON(inputJson));
return instance;
}
/**
* Deserializes an offer_dlc message with backward compatibility
* Detects old format (without protocol_version) vs new format (with protocol_version)
* @param buf
*/
public static deserialize(buf: Buffer): DlcOffer {
const instance = new DlcOffer();
const reader = new BufferReader(buf);
const type = reader.readUInt16BE(); // read type
// Validate type matches expected DlcOffer type
if (type !== MessageType.DlcOffer) {
throw new Error(
`Invalid message type. Expected ${MessageType.DlcOffer}, got ${type}`,
);
}
// BACKWARD COMPATIBILITY: Detect old vs new format
// New format: [type][protocol_version: 4 bytes][contract_flags: 1 byte][chain_hash: 32 bytes]
// Old format: [type][contract_flags: 1 byte][chain_hash: 32 bytes]
const nextBytes = reader.buffer.subarray(
reader.position,
reader.position + 5,
);
const possibleProtocolVersion = nextBytes.readUInt32BE(0);
const possibleContractFlags = nextBytes.readUInt8(4);
// Heuristic: protocol_version should be 1, contract_flags should be 0
// If first 4 bytes are reasonable protocol version (1-10) and next byte is 0, assume new format
const isNewFormat =
possibleProtocolVersion >= 1 &&
possibleProtocolVersion <= 10 &&
possibleContractFlags === 0;
Eif (isNewFormat) {
// New format with protocol_version
instance.protocolVersion = reader.readUInt32BE();
instance.contractFlags = reader.readBytes(1);
} else {
// Old format without protocol_version
instance.protocolVersion = 1; // Default to version 1
instance.contractFlags = reader.readBytes(1);
}
instance.chainHash = reader.readBytes(32);
instance.temporaryContractId = reader.readBytes(32);
// ContractInfo is serialized as sibling type in dlcspecs PR #163 format
instance.contractInfo = ContractInfo.deserialize(
reader.buffer.subarray(reader.position),
);
// Skip past the ContractInfo we just read
const contractInfoLength = instance.contractInfo.serialize().length;
reader.position += contractInfoLength;
instance.fundingPubkey = reader.readBytes(33);
const payoutSpkLen = reader.readUInt16BE();
instance.payoutSpk = reader.readBytes(payoutSpkLen);
instance.payoutSerialId = reader.readUInt64BE();
instance.offerCollateral = reader.readUInt64BE();
// Changed from u16 to bigsize as per dlcspecs PR #163
const fundingInputsLen = Number(reader.readBigSize());
for (let i = 0; i < fundingInputsLen; i++) {
// FundingInput body is serialized directly without TLV wrapper in rust-dlc format
const fundingInput = FundingInput.deserializeBody(
reader.buffer.subarray(reader.position),
);
instance.fundingInputs.push(fundingInput);
// Skip past the FundingInput we just read
const fundingInputLength = fundingInput.serializeBody().length;
reader.position += fundingInputLength;
}
const changeSpkLen = reader.readUInt16BE();
instance.changeSpk = reader.readBytes(changeSpkLen);
instance.changeSerialId = reader.readUInt64BE();
instance.fundOutputSerialId = reader.readUInt64BE();
instance.feeRatePerVb = reader.readUInt64BE();
instance.cetLocktime = reader.readUInt32BE();
instance.refundLocktime = reader.readUInt32BE();
// Parse TLV stream as per dlcspecs PR #163
while (!reader.eof) {
const buf = getTlv(reader);
const tlvReader = new BufferReader(buf);
const { type } = deserializeTlv(tlvReader);
switch (Number(type)) {
case MessageType.OrderMetadataV0:
instance.metadata = OrderMetadataV0.deserialize(buf);
break;
case MessageType.OrderIrcInfoV0:
instance.ircInfo = OrderIrcInfoV0.deserialize(buf);
break;
case MessageType.OrderPositionInfo:
instance.positionInfo = OrderPositionInfo.deserialize(buf);
break;
case MessageType.BatchFundingGroup:
Eif (!instance.batchFundingGroups) {
instance.batchFundingGroups = [];
}
instance.batchFundingGroups.push(BatchFundingGroup.deserialize(buf));
break;
default:
// Store unknown TLVs for future compatibility
if (!instance.unknownTlvs) {
instance.unknownTlvs = [];
}
instance.unknownTlvs.push({ type: Number(type), data: buf });
break;
}
}
// Auto-detect single funded DLCs
if (
instance.contractInfo.getTotalCollateral() === instance.offerCollateral
) {
instance.singleFunded = true;
}
return instance;
}
/**
* The type for offer_dlc message. offer_dlc = 42778
*/
public type = DlcOffer.type;
// New fields as per dlcspecs PR #163
public protocolVersion: number = PROTOCOL_VERSION; // Default to current protocol version
public temporaryContractId: Buffer; // New field for contract identification
// Existing fields
public contractFlags: Buffer;
public chainHash: Buffer;
public contractInfo: ContractInfo;
public fundingPubkey: Buffer;
public payoutSpk: Buffer;
public payoutSerialId: bigint;
public offerCollateral: bigint;
public fundingInputs: FundingInput[] = [];
public changeSpk: Buffer;
public changeSerialId: bigint;
public fundOutputSerialId: bigint;
public feeRatePerVb: bigint;
public cetLocktime: number;
public refundLocktime: number;
public metadata?: OrderMetadata;
public ircInfo?: OrderIrcInfo;
public positionInfo?: OrderPositionInfo;
public batchFundingGroups?: BatchFundingGroup[];
// Store unknown TLVs for forward compatibility
public unknownTlvs?: Array<{ type: number; data: Buffer }>;
/**
* Flag to indicate if this is a single funded DLC
* In single funded DLCs, totalCollateral equals offerCollateral
*/
public singleFunded = false;
/**
* Marks this DLC offer as single funded and validates that collateral amounts are correct
* @throws Will throw an error if totalCollateral doesn't equal offerCollateral
*/
public markAsSingleFunded(): void {
const totalCollateral = this.contractInfo.getTotalCollateral();
if (totalCollateral !== this.offerCollateral) {
throw new Error(
`Cannot mark as single funded: totalCollateral (${totalCollateral}) must equal offerCollateral (${this.offerCollateral})`,
);
}
this.singleFunded = true;
}
/**
* Checks if this DLC offer is single funded (totalCollateral == offerCollateral)
* @returns True if this is a single funded DLC
*/
public isSingleFunded(): boolean {
return (
this.singleFunded ||
this.contractInfo.getTotalCollateral() === this.offerCollateral
);
}
/**
* Get funding, change and payout address from DlcOffer
* @param network Bitcoin Network
* @returns {IDlcOfferAddresses}
*/
public getAddresses(network: BitcoinNetwork): IDlcOfferAddresses {
const fundingSPK = Script.p2wpkhLock(hash160(this.fundingPubkey))
.serialize()
.slice(1);
const fundingAddress = address.fromOutputScript(fundingSPK, network);
const changeAddress = address.fromOutputScript(this.changeSpk, network);
const payoutAddress = address.fromOutputScript(this.payoutSpk, network);
return {
fundingAddress,
changeAddress,
payoutAddress,
};
}
/**
* Validates correctness of all fields in DlcOffer
* Updated validation rules as per dlcspecs PR #163
* @throws Will throw an error if validation fails
*/
public validate(): void {
// 1. Type is set automatically in class
// 2. protocol_version validation
if (this.protocolVersion !== PROTOCOL_VERSION) {
throw new Error(
`Unsupported protocol version: ${this.protocolVersion}, expected: ${PROTOCOL_VERSION}`,
);
}
// 3. temporary_contract_id validation
if (!this.temporaryContractId || this.temporaryContractId.length !== 32) {
throw new Error('temporaryContractId must be 32 bytes');
}
// 4. contract_flags field is ignored
// 5. chain_hash must be validated as input by end user
// 6. payout_spk and change_spk must be standard script pubkeys
try {
address.fromOutputScript(this.payoutSpk);
} catch (e) {
throw new Error('DlcOffer payoutSpk is invalid');
}
try {
address.fromOutputScript(this.changeSpk);
} catch (e) {
throw new Error('DlcOffer changeSpk is invalid');
}
// 7. funding_pubkey must be a valid secp256k1 pubkey in compressed format
// https://github.com/bitcoin/bips/blob/master/bip-0137.mediawiki#background-on-ecdsa-signatures
if (secp256k1.publicKeyVerify(Buffer.from(this.fundingPubkey))) {
if (this.fundingPubkey[0] != 0x02 && this.fundingPubkey[0] != 0x03) {
throw new Error('fundingPubkey must be in compressed format');
}
} else {
throw new Error('fundingPubkey is not a valid secp256k1 key');
}
// 8. offer_collateral must be greater than or equal to 1000
if (this.offerCollateral < 1000) {
throw new Error('offer_collateral must be greater than or equal to 1000');
}
if (this.cetLocktime < 0) {
throw new Error('cet_locktime must be greater than or equal to 0');
}
if (this.refundLocktime < 0) {
throw new Error('refund_locktime must be greater than or equal to 0');
}
// 9. cet_locktime and refund_locktime must either both be unix timestamps, or both be block heights.
// https://en.bitcoin.it/wiki/NLockTime
// https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki#detailed-specification
// https://github.com/bitcoin/bitcoin/blob/master/src/script/script.h#L39
if (
!(
(this.cetLocktime < LOCKTIME_THRESHOLD &&
this.refundLocktime < LOCKTIME_THRESHOLD) ||
(this.cetLocktime >= LOCKTIME_THRESHOLD &&
this.refundLocktime >= LOCKTIME_THRESHOLD)
)
) {
throw new Error('cetLocktime and refundLocktime must be in same units');
}
// 10. cetLocktime must be less than refundLocktime
if (this.cetLocktime >= this.refundLocktime) {
throw new Error('cetLocktime must be less than refundLocktime');
}
// 11. inputSerialId must be unique for each input
const inputSerialIds = this.fundingInputs.map(
(input: FundingInput) => input.inputSerialId,
);
if (new Set(inputSerialIds).size !== inputSerialIds.length) {
throw new Error('inputSerialIds must be unique');
}
// 12. changeSerialId and fundOutputSerialID must be different
if (this.changeSerialId === this.fundOutputSerialId) {
throw new Error(
'changeSerialId and fundOutputSerialId must be different',
);
}
// validate contractInfo
this.contractInfo.validate();
// totalCollateral should be > offerCollateral (logical validation)
// Exception: for single funded DLCs, totalCollateral == offerCollateral is allowed
if (this.isSingleFunded()) {
Iif (this.contractInfo.getTotalCollateral() !== this.offerCollateral) {
throw new Error(
'For single funded DLCs, totalCollateral must equal offerCollateral',
);
}
} else {
if (this.contractInfo.getTotalCollateral() <= this.offerCollateral) {
throw new Error(
'totalCollateral should be greater than offerCollateral',
);
}
}
// validate funding amount
const fundingAmount = this.fundingInputs.reduce((acc, fundingInput) => {
const input = fundingInput as FundingInput;
return acc + input.prevTx.outputs[input.prevTxVout].value.sats;
}, BigInt(0));
if (this.isSingleFunded()) {
// For single funded DLCs, funding amount must cover the full total collateral plus fees
if (fundingAmount < this.contractInfo.getTotalCollateral()) {
throw new Error(
'For single funded DLCs, fundingAmount must be at least totalCollateral',
);
}
} else {
// For regular DLCs, funding amount must be greater than offer collateral
Iif (this.offerCollateral >= fundingAmount) {
throw new Error('fundingAmount must be greater than offerCollateral');
}
}
}
/**
* Converts dlc_offer to JSON (canonical rust-dlc format)
*/
public toJSON(): IDlcOfferJSON {
const tlvs = [];
if (this.metadata) tlvs.push(this.metadata.toJSON());
if (this.ircInfo) tlvs.push(this.ircInfo.toJSON());
if (this.positionInfo) tlvs.push(this.positionInfo.toJSON());
if (this.batchFundingGroups)
this.batchFundingGroups.forEach((fundingInfo) =>
tlvs.push(fundingInfo.toJSON()),
);
// Include unknown TLVs for debugging
Iif (this.unknownTlvs) {
this.unknownTlvs.forEach((tlv) =>
tlvs.push({ type: tlv.type, data: tlv.data.toString('hex') }),
);
}
// Return canonical rust-dlc format only
return {
protocolVersion: this.protocolVersion,
temporaryContractId: this.temporaryContractId.toString('hex'),
contractFlags: Number(this.contractFlags[0]),
chainHash: this.chainHash.toString('hex'),
contractInfo: this.contractInfo.toJSON(),
fundingPubkey: this.fundingPubkey.toString('hex'), // lowercase 'k'
payoutSpk: this.payoutSpk.toString('hex'), // lowercase
payoutSerialId: bigIntToNumber(this.payoutSerialId),
offerCollateral: bigIntToNumber(this.offerCollateral), // no "Satoshis"
fundingInputs: this.fundingInputs.map((input) => input.toJSON()),
changeSpk: this.changeSpk.toString('hex'), // lowercase
changeSerialId: bigIntToNumber(this.changeSerialId),
fundOutputSerialId: bigIntToNumber(this.fundOutputSerialId),
feeRatePerVb: bigIntToNumber(this.feeRatePerVb),
cetLocktime: this.cetLocktime,
refundLocktime: this.refundLocktime,
}; // Allow different field names from interface
}
/**
* Serializes the offer_dlc message into a Buffer
* Updated serialization format as per dlcspecs PR #163
*/
public serialize(): Buffer {
const writer = new BufferWriter();
writer.writeUInt16BE(this.type);
// New fields as per dlcspecs PR #163
writer.writeUInt32BE(this.protocolVersion);
writer.writeBytes(this.contractFlags);
writer.writeBytes(this.chainHash);
writer.writeBytes(this.temporaryContractId); // New field
writer.writeBytes(this.contractInfo.serialize());
writer.writeBytes(this.fundingPubkey);
writer.writeUInt16BE(this.payoutSpk.length);
writer.writeBytes(this.payoutSpk);
writer.writeUInt64BE(this.payoutSerialId);
writer.writeUInt64BE(this.offerCollateral);
// Changed from u16 to bigsize as per dlcspecs PR #163
writer.writeBigSize(this.fundingInputs.length);
for (const fundingInput of this.fundingInputs) {
// Use serializeBody() to match rust-dlc behavior - funding inputs in vec are serialized without TLV wrapper
writer.writeBytes(fundingInput.serializeBody());
}
writer.writeUInt16BE(this.changeSpk.length);
writer.writeBytes(this.changeSpk);
writer.writeUInt64BE(this.changeSerialId);
writer.writeUInt64BE(this.fundOutputSerialId);
writer.writeUInt64BE(this.feeRatePerVb);
writer.writeUInt32BE(this.cetLocktime);
writer.writeUInt32BE(this.refundLocktime);
// TLV stream as per dlcspecs PR #163
if (this.metadata) writer.writeBytes(this.metadata.serialize());
if (this.ircInfo) writer.writeBytes(this.ircInfo.serialize());
if (this.positionInfo) writer.writeBytes(this.positionInfo.serialize());
if (this.batchFundingGroups)
this.batchFundingGroups.forEach((fundingInfo) =>
writer.writeBytes(fundingInfo.serialize()),
);
// Write unknown TLVs for forward compatibility
Iif (this.unknownTlvs) {
this.unknownTlvs.forEach((tlv) => {
writer.writeBytes(tlv.data);
});
}
return writer.toBuffer();
}
}
export interface IDlcOfferJSON {
type?: number; // Made optional for rust-dlc compatibility
protocolVersion: number;
temporaryContractId: string;
contractFlags: number;
chainHash: string;
contractInfo: ISingleContractInfoJSON | IDisjointContractInfoJSON;
fundingPubkey: string;
payoutSpk: string;
payoutSerialId: number;
offerCollateral: number;
fundingInputs: IFundingInputJSON[];
changeSpk: string;
changeSerialId: number;
fundOutputSerialId: number;
feeRatePerVb: number;
cetLocktime: number;
refundLocktime: number;
serialized?: string; // Made optional - hex serialization for compatibility testing
tlvs?: (
| IOrderMetadataJSON
| IOrderIrcInfoJSON
| IOrderPositionInfoJSON
| IBatchFundingGroupJSON
| unknown
)[]; // Made optional - for unknown TLVs
}
export interface IDlcOfferAddresses {
fundingAddress: string;
changeAddress: string;
payoutAddress: string;
}
export class DlcOfferContainer {
private offers: DlcOffer[] = [];
/**
* Adds a DlcOffer to the container.
* @param offer The DlcOffer to add.
*/
public addOffer(offer: DlcOffer): void {
this.offers.push(offer);
}
/**
* Returns all DlcOffers in the container.
* @returns An array of DlcOffer instances.
*/
public getOffers(): DlcOffer[] {
return this.offers;
}
/**
* Serializes all DlcOffers in the container to a Buffer.
* @returns A Buffer containing the serialized DlcOffers.
*/
public serialize(): Buffer {
const writer = new BufferWriter();
// Write the number of offers in the container first.
writer.writeBigSize(this.offers.length);
// Serialize each offer and write it.
this.offers.forEach((offer) => {
const serializedOffer = offer.serialize();
// Optionally, write the length of the serialized offer for easier deserialization.
writer.writeBigSize(serializedOffer.length);
writer.writeBytes(serializedOffer);
});
return writer.toBuffer();
}
/**
* Deserializes a Buffer into a DlcOfferContainer with DlcOffers.
* @param buf The Buffer to deserialize.
* @returns A DlcOfferContainer instance.
*/
public static deserialize(buf: Buffer): DlcOfferContainer {
const reader = new BufferReader(buf);
const container = new DlcOfferContainer();
const offersCount = reader.readBigSize();
for (let i = 0; i < offersCount; i++) {
// Optionally, read the length of the serialized offer if it was written during serialization.
const offerLength = reader.readBigSize();
const offerBuf = reader.readBytes(Number(offerLength));
const offer = DlcOffer.deserialize(offerBuf);
container.addOffer(offer);
}
return container;
}
}
|