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import secp256k1 from 'secp256k1';
import { MessageType, PROTOCOL_VERSION } from '../MessageType';
import { deserializeTlv } from '../serialize/deserializeTlv';
import { getTlv } from '../serialize/getTlv';
import { BatchFundingGroup } from './BatchFundingGroup';
import {
CetAdaptorSignatures,
ICetAdaptorSignaturesJSON,
} from './CetAdaptorSignatures';
import { IDlcMessage } from './DlcMessage';
import { FundingSignatures, IFundingSignaturesJSON } from './FundingSignatures';
import { ScriptWitnessV0 } from './ScriptWitnessV0';
/**
* DlcSign gives all of the initiator's signatures, which allows the
* receiver to broadcast the funding transaction with both parties being
* fully committed to all closing transactions.
* Updated to support dlcspecs PR #163 format.
*/
export class DlcSign implements IDlcMessage {
public static type = MessageType.DlcSign;
/**
* Creates a DlcSign 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 sign
*/
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
public static fromJSON(json: any): DlcSign {
const instance = new DlcSign();
// Helper function to parse DER-encoded signature and extract raw r,s values (64 bytes total)
const parseDerSignature = (hexSig: string): Buffer => {
const sigBuffer = Buffer.from(hexSig, 'hex');
// If it's already 64 bytes, assume it's raw
Iif (sigBuffer.length === 64) {
return sigBuffer;
}
// Use secp256k1.signatureImport to parse DER signature
try {
const rawSig = secp256k1.signatureImport(sigBuffer);
return Buffer.from(rawSig);
} catch (ex) {
throw new Error(`Invalid DER signature: ${ex.message}`);
}
};
// Handle both internal and external field naming conventions
instance.protocolVersion =
json.protocolVersion || json.protocol_version || PROTOCOL_VERSION;
instance.contractId = Buffer.from(
json.contractId || json.contract_id,
'hex',
);
// Parse CET adaptor signatures
instance.cetAdaptorSignatures = DlcSign.parseCetAdaptorSignaturesFromJSON(
json.cetAdaptorSignatures || json.cet_adaptor_signatures,
);
// Parse refund signature - handle DER encoding
const refundSigHex = json.refundSignature || json.refund_signature;
instance.refundSignature = parseDerSignature(refundSigHex);
// Parse funding signatures
instance.fundingSignatures = DlcSign.parseFundingSignaturesFromJSON(
json.fundingSignatures || json.funding_signatures,
);
return instance;
}
/**
* Parses CetAdaptorSignatures from JSON
* @param cetSigsJson JSON object representing CET adaptor signatures
*/
private static parseCetAdaptorSignaturesFromJSON(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
cetSigsJson: any,
): CetAdaptorSignatures {
const instance = new CetAdaptorSignatures();
Eif (
cetSigsJson.ecdsaAdaptorSignatures ||
cetSigsJson.ecdsa_adaptor_signatures
) {
const ecdsaSigs =
cetSigsJson.ecdsaAdaptorSignatures ||
cetSigsJson.ecdsa_adaptor_signatures;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
instance.sigs = ecdsaSigs.map((sig: any) => {
// The test vectors use 'signature' field, but our internal format uses encryptedSig/dleqProof
// For now, we'll parse the signature as encryptedSig and leave dleqProof empty
const sigBuffer = Buffer.from(sig.signature, 'hex');
return {
encryptedSig: sigBuffer.slice(0, 65), // First 65 bytes
dleqProof:
sigBuffer.length > 65 ? sigBuffer.slice(65, 162) : Buffer.alloc(97), // Next 97 bytes or empty
};
});
}
return instance;
}
/**
* Parses FundingSignatures from JSON
* @param fundingSigsJson JSON object representing funding signatures
*/
private static parseFundingSignaturesFromJSON(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
fundingSigsJson: any,
): FundingSignatures {
const instance = new FundingSignatures();
Eif (
fundingSigsJson.fundingSignatures ||
fundingSigsJson.funding_signatures
) {
const fundingSigs =
fundingSigsJson.fundingSignatures || fundingSigsJson.funding_signatures;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
instance.witnessElements = fundingSigs.map((sig: any) =>
(sig.witnessElements || sig.witness_elements || []).map(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(element: any) => {
// Create a ScriptWitnessV0 instance for each witness element
const witness = new ScriptWitnessV0();
witness.witness = Buffer.from(element.witness || element, 'hex');
return witness;
},
),
);
}
return instance;
}
/**
* Deserializes a sign_dlc message
* @param buf
*/
public static deserialize(buf: Buffer): DlcSign {
const instance = new DlcSign();
const reader = new BufferReader(buf);
reader.readUInt16BE(); // read type
// New fields as per dlcspecs PR #163
instance.protocolVersion = reader.readUInt32BE();
instance.contractId = reader.readBytes(32);
// Read CET adaptor signatures directly to match serialize format (no TLV wrapping)
instance.cetAdaptorSignatures = CetAdaptorSignatures.deserialize(
Buffer.from(reader.buffer.subarray(reader.position)),
);
// Skip past the CET adaptor signatures we just read
const cetLength = instance.cetAdaptorSignatures.serialize().length;
reader.position += cetLength;
instance.refundSignature = reader.readBytes(64);
// Read funding signatures directly to match serialize format (no TLV wrapping)
instance.fundingSignatures = FundingSignatures.deserialize(
Buffer.from(reader.buffer.subarray(reader.position)),
);
// Skip past the funding signatures we just read
const fundingLength = instance.fundingSignatures.serialize().length;
reader.position += fundingLength;
// 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.BatchFundingGroup:
if (!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;
}
}
return instance;
}
/**
* The type for sign_dlc message. sign_dlc = 42782
*/
public type = DlcSign.type;
// New fields as per dlcspecs PR #163
public protocolVersion: number = PROTOCOL_VERSION; // Default to current protocol version
// Existing fields
public contractId: Buffer;
public cetAdaptorSignatures: CetAdaptorSignatures;
public refundSignature: Buffer;
public fundingSignatures: FundingSignatures;
public batchFundingGroups?: BatchFundingGroup[];
// Store unknown TLVs for forward compatibility
public unknownTlvs?: Array<{ type: number; data: Buffer }>;
/**
* Validates correctness of all fields
* 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. contract_id must be 32 bytes
if (!this.contractId || this.contractId.length !== 32) {
throw new Error('contractId must be 32 bytes');
}
// 4. Other validations would depend on specific business logic
// TODO: Add more specific validation rules as needed
}
/**
* Converts sign_dlc to JSON (canonical rust-dlc format)
*/
public toJSON(): IDlcSignJSON {
// Convert raw signature back to DER format for canonical rust-dlc JSON
const derRefundSignature = secp256k1.signatureExport(this.refundSignature);
return {
protocolVersion: this.protocolVersion,
contractId: this.contractId.toString('hex'),
cetAdaptorSignatures: this.cetAdaptorSignatures.toJSON(),
refundSignature: Buffer.from(derRefundSignature).toString('hex'),
fundingSignatures: this.fundingSignatures.toJSON(),
};
}
/**
* Serializes the sign_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.contractId);
writer.writeBytes(this.cetAdaptorSignatures.serialize());
writer.writeBytes(this.refundSignature);
writer.writeBytes(this.fundingSignatures.serialize());
// TLV stream as per dlcspecs PR #163
Iif (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 IDlcSignJSON {
protocolVersion: number;
contractId: string;
cetAdaptorSignatures: ICetAdaptorSignaturesJSON;
refundSignature: string;
fundingSignatures: IFundingSignaturesJSON;
}
export class DlcSignContainer {
private signs: DlcSign[] = [];
/**
* Adds a DlcSign to the container.
* @param sign The DlcSign to add.
*/
public addSign(sign: DlcSign): void {
this.signs.push(sign);
}
/**
* Returns all DlcSigns in the container.
* @returns An array of DlcSign instances.
*/
public getSigns(): DlcSign[] {
return this.signs;
}
/**
* Serializes all DlcSigns in the container to a Buffer.
* @returns A Buffer containing the serialized DlcSigns.
*/
public serialize(): Buffer {
const writer = new BufferWriter();
// Write the number of signs in the container first.
writer.writeBigSize(this.signs.length);
// Serialize each sign and write it.
this.signs.forEach((sign) => {
const serializedSign = sign.serialize();
// Optionally, write the length of the serialized sign for easier deserialization.
writer.writeBigSize(serializedSign.length);
writer.writeBytes(serializedSign);
});
return writer.toBuffer();
}
/**
* Deserializes a Buffer into a DlcSignContainer with DlcSigns.
* @param buf The Buffer to deserialize.
* @returns A DlcSignContainer instance.
*/
public static deserialize(buf: Buffer): DlcSignContainer {
const reader = new BufferReader(buf);
const container = new DlcSignContainer();
const signsCount = reader.readBigSize();
for (let i = 0; i < signsCount; i++) {
// Optionally, read the length of the serialized sign if it was written during serialization.
const signLength = reader.readBigSize();
const signBuf = reader.readBytes(Number(signLength));
const sign = DlcSign.deserialize(signBuf);
container.addSign(sign);
}
return container;
}
}
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