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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 } from '../MessageType';
import { deserializeTlv } from '../serialize/deserializeTlv';
import { getTlv, skipTlv } from '../serialize/getTlv';
import { BatchFundingGroup, IBatchFundingGroupJSON } from './BatchFundingGroup';
import {
CetAdaptorSignaturesV0,
ICetAdaptorSignaturesV0JSON,
} from './CetAdaptorSignaturesV0';
import { IDlcMessage } from './DlcMessage';
import { FundingInputV0, IFundingInputV0JSON } from './FundingInput';
import {
INegotiationFieldsV0JSON,
INegotiationFieldsV1JSON,
INegotiationFieldsV2JSON,
NegotiationFields,
} from './NegotiationFields';
export abstract class DlcAccept implements IDlcMessage {
public static deserialize(buf: Buffer, parseCets = true): DlcAcceptV0 {
const reader = new BufferReader(buf);
const type = Number(reader.readUInt16BE());
switch (type) {
case MessageType.DlcAcceptV0:
return DlcAcceptV0.deserialize(buf, parseCets);
default:
throw new Error(`Dlc Accept message type must be DlcAcceptV0`);
}
}
public abstract type: number;
public abstract getAddresses(network: BitcoinNetwork): IDlcAcceptV0Addresses;
public abstract toJSON(): IDlcAcceptV0JSON;
public abstract serialize(): Buffer;
}
/**
* DlcAccept contains information about a node and indicates its
* acceptance of the new DLC, as well as its CET and refund
* transaction signatures. This is the second step toward creating
* the funding transaction and closing transactions.
*/
export class DlcAcceptV0 extends DlcAccept implements IDlcMessage {
public static type = MessageType.DlcAcceptV0;
/**
* Deserializes an oracle_info message
* @param buf
*/
public static deserialize(buf: Buffer, parseCets = true): DlcAcceptV0 {
const instance = new DlcAcceptV0();
const reader = new BufferReader(buf);
reader.readUInt16BE(); // read type
instance.tempContractId = reader.readBytes(32);
instance.acceptCollateralSatoshis = reader.readUInt64BE();
instance.fundingPubKey = reader.readBytes(33);
const payoutSPKLen = reader.readUInt16BE();
instance.payoutSPK = reader.readBytes(payoutSPKLen);
instance.payoutSerialId = reader.readUInt64BE();
const fundingInputsLen = reader.readUInt16BE();
for (let i = 0; i < fundingInputsLen; i++) {
instance.fundingInputs.push(FundingInputV0.deserialize(getTlv(reader)));
}
const changeSPKLen = reader.readUInt16BE();
instance.changeSPK = reader.readBytes(changeSPKLen);
instance.changeSerialId = reader.readUInt64BE();
if (parseCets) {
instance.cetSignatures = CetAdaptorSignaturesV0.deserialize(
getTlv(reader),
);
} else {
skipTlv(reader);
instance.cetSignatures = new CetAdaptorSignaturesV0();
}
instance.refundSignature = reader.readBytes(64);
instance.negotiationFields = NegotiationFields.deserialize(getTlv(reader));
while (!reader.eof) {
const buf = getTlv(reader);
const tlvReader = new BufferReader(buf);
const { type } = deserializeTlv(tlvReader);
switch (Number(type)) {
case MessageType.BatchFundingGroup:
Eif (!instance.batchFundingGroups) {
instance.batchFundingGroups = [];
}
instance.batchFundingGroups.push(BatchFundingGroup.deserialize(buf));
break;
default:
break;
}
}
return instance;
}
/**
* The type for accept_channel message. accept_channel = 33
*/
public type = DlcAcceptV0.type;
public tempContractId: Buffer;
public acceptCollateralSatoshis: bigint;
public fundingPubKey: Buffer;
public payoutSPK: Buffer;
public payoutSerialId: bigint;
public fundingInputs: FundingInputV0[] = [];
public changeSPK: Buffer;
public changeSerialId: bigint;
public cetSignatures: CetAdaptorSignaturesV0;
public refundSignature: Buffer;
public negotiationFields: NegotiationFields;
public batchFundingGroups?: BatchFundingGroup[];
/**
* Get funding, change and payout address from DlcOffer
* @param network Bitcoin Network
* @returns {IDlcOfferV0Addresses}
*/
public getAddresses(network: BitcoinNetwork): IDlcAcceptV0Addresses {
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
* https://github.com/discreetlogcontracts/dlcspecs/blob/master/Protocol.md#the-accept_dlc-message
* @throws Will throw an error if validation fails
*/
public validate(): void {
// 1. Type is set automatically in class
// 2. payout_spk and change_spk must be standard script pubkeys
try {
address.fromOutputScript(this.payoutSPK);
} catch (e) {
throw new Error('payoutSPK is invalid');
}
try {
address.fromOutputScript(this.changeSPK);
} catch (e) {
throw new Error('changeSPK is invalid');
}
// 3. 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');
}
// 4. inputSerialId must be unique for each input
const inputSerialIds = this.fundingInputs.map(
(input: FundingInputV0) => input.inputSerialId,
);
if (new Set(inputSerialIds).size !== inputSerialIds.length) {
throw new Error('inputSerialIds must be unique');
}
// 5. Ensure funding inputs are segwit
this.fundingInputs.forEach((input: FundingInputV0) => input.validate());
// validate funding amount
const fundingAmount = this.fundingInputs.reduce((acc, fundingInput) => {
const input = fundingInput as FundingInputV0;
return acc + input.prevTx.outputs[input.prevTxVout].value.sats;
}, BigInt(0));
if (this.acceptCollateralSatoshis >= fundingAmount) {
throw new Error(
'fundingAmount must be greater than acceptCollateralSatoshis',
);
}
}
/**
* Converts dlc_accept_v0 to JSON
*/
public toJSON(): IDlcAcceptV0JSON {
const tlvs = [];
Iif (this.batchFundingGroups) {
this.batchFundingGroups.forEach((group) => {
tlvs.push(group.serialize());
});
}
return {
type: this.type,
tempContractId: this.tempContractId.toString('hex'),
acceptCollateralSatoshis: Number(this.acceptCollateralSatoshis),
fundingPubKey: this.fundingPubKey.toString('hex'),
payoutSPK: this.payoutSPK.toString('hex'),
payoutSerialId: Number(this.payoutSerialId),
fundingInputs: this.fundingInputs.map((input) => input.toJSON()),
changeSPK: this.changeSPK.toString('hex'),
changeSerialId: Number(this.changeSerialId),
cetSignatures: this.cetSignatures.toJSON(),
refundSignature: this.refundSignature.toString('hex'),
negotiationFields: this.negotiationFields.toJSON(),
tlvs,
};
}
/**
* Serializes the accept_channel message into a Buffer
*/
public serialize(): Buffer {
const writer = new BufferWriter();
writer.writeUInt16BE(this.type);
writer.writeBytes(this.tempContractId);
writer.writeUInt64BE(this.acceptCollateralSatoshis);
writer.writeBytes(this.fundingPubKey);
writer.writeUInt16BE(this.payoutSPK.length);
writer.writeBytes(this.payoutSPK);
writer.writeUInt64BE(this.payoutSerialId);
writer.writeUInt16BE(this.fundingInputs.length);
for (const fundingInput of this.fundingInputs) {
writer.writeBytes(fundingInput.serialize());
}
writer.writeUInt16BE(this.changeSPK.length);
writer.writeBytes(this.changeSPK);
writer.writeUInt64BE(this.changeSerialId);
writer.writeBytes(this.cetSignatures.serialize());
writer.writeBytes(this.refundSignature);
writer.writeBytes(this.negotiationFields.serialize());
if (this.batchFundingGroups)
this.batchFundingGroups.forEach((fundingInfo) =>
writer.writeBytes(fundingInfo.serialize()),
);
return writer.toBuffer();
}
public withoutSigs(): DlcAcceptWithoutSigs {
return new DlcAcceptWithoutSigs(
this.tempContractId,
this.acceptCollateralSatoshis,
this.fundingPubKey,
this.payoutSPK,
this.payoutSerialId,
this.fundingInputs,
this.changeSPK,
this.changeSerialId,
this.negotiationFields,
this.batchFundingGroups,
);
}
}
export class DlcAcceptWithoutSigs {
constructor(
readonly tempContractId: Buffer,
readonly acceptCollateralSatoshis: bigint,
readonly fundingPubKey: Buffer,
readonly payoutSPK: Buffer,
readonly payoutSerialId: bigint,
readonly fundingInputs: FundingInputV0[],
readonly changeSPK: Buffer,
readonly changeSerialId: bigint,
readonly negotiationFields: NegotiationFields,
readonly batchFundingGroups?: BatchFundingGroup[],
) {}
}
export interface IDlcAcceptV0JSON {
type: number;
tempContractId: string;
acceptCollateralSatoshis: number;
fundingPubKey: string;
payoutSPK: string;
payoutSerialId: number;
fundingInputs: IFundingInputV0JSON[];
changeSPK: string;
changeSerialId: number;
cetSignatures: ICetAdaptorSignaturesV0JSON;
refundSignature: string;
negotiationFields:
| INegotiationFieldsV0JSON
| INegotiationFieldsV1JSON
| INegotiationFieldsV2JSON;
tlvs: IBatchFundingGroupJSON[];
}
export interface IDlcAcceptV0Addresses {
fundingAddress: string;
changeAddress: string;
payoutAddress: string;
}
export class DlcAcceptContainer {
private accepts: DlcAccept[] = [];
/**
* Adds a DlcAccept to the container.
* @param accept The DlcAccept to add.
*/
public addAccept(accept: DlcAccept): void {
this.accepts.push(accept);
}
/**
* Returns all DlcAccepts in the container.
* @returns An array of DlcAccept instances.
*/
public getAccepts(): DlcAccept[] {
return this.accepts;
}
/**
* Serializes all DlcAccepts in the container to a Buffer.
* @returns A Buffer containing the serialized DlcAccepts.
*/
public serialize(): Buffer {
const writer = new BufferWriter();
// Write the number of accepts in the container first.
writer.writeBigSize(this.accepts.length);
// Serialize each accept and write it.
this.accepts.forEach((accept) => {
const serializedAccept = accept.serialize();
// Optionally, write the length of the serialized accept for easier deserialization.
writer.writeBigSize(serializedAccept.length);
writer.writeBytes(serializedAccept);
});
return writer.toBuffer();
}
/**
* Deserializes a Buffer into a DlcAcceptContainer with DlcAccepts.
* @param buf The Buffer to deserialize.
* @returns A DlcAcceptContainer instance.
*/
public static deserialize(buf: Buffer, parseCets = true): DlcAcceptContainer {
const reader = new BufferReader(buf);
const container = new DlcAcceptContainer();
const acceptsCount = reader.readBigSize();
for (let i = 0; i < acceptsCount; i++) {
const acceptLength = reader.readBigSize();
const acceptBuf = reader.readBytes(Number(acceptLength));
const accept = DlcAccept.deserialize(acceptBuf, parseCets); // Adjust based on actual implementation.
container.addAccept(accept);
}
return container;
}
}
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