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DlcSign.ts
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DlcSign.ts
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import { BufferReader, BufferWriter } from '@node-lightning/bufio';
import { MessageType } from '../MessageType';
import { deserializeTlv } from '../serialize/deserializeTlv';
import { getTlv } from '../serialize/getTlv';
import { BatchFundingGroup, IBatchFundingGroupJSON } from './BatchFundingGroup';
import {
CetAdaptorSignaturesV0,
ICetAdaptorSignaturesV0JSON,
} from './CetAdaptorSignaturesV0';
import { IDlcMessage } from './DlcMessage';
import {
FundingSignaturesV0,
IFundingSignaturesV0JSON,
} from './FundingSignaturesV0';
export abstract class DlcSign {
public static deserialize(buf: Buffer): DlcSignV0 {
const reader = new BufferReader(buf);
const type = Number(reader.readUInt16BE());
switch (type) {
case MessageType.DlcSignV0:
return DlcSignV0.deserialize(buf);
default:
throw new Error(`Dlc Sign message type must be DlcSignV0`);
}
}
public abstract type: number;
public abstract toJSON(): IDlcSignV0JSON;
public abstract serialize(): Buffer;
}
/**
* 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.
*/
export class DlcSignV0 extends DlcSign implements IDlcMessage {
public static type = MessageType.DlcSignV0;
/**
* Deserializes an sign_dlc_v0 message
* @param buf
*/
public static deserialize(buf: Buffer): DlcSignV0 {
const instance = new DlcSignV0();
const reader = new BufferReader(buf);
reader.readUInt16BE(); // read type
instance.contractId = reader.readBytes(32);
instance.cetSignatures = CetAdaptorSignaturesV0.deserialize(getTlv(reader));
instance.refundSignature = reader.readBytes(64);
instance.fundingSignatures = FundingSignaturesV0.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:
if (!instance.batchFundingGroups) {
instance.batchFundingGroups = [];
}
instance.batchFundingGroups.push(BatchFundingGroup.deserialize(buf));
break;
default:
break;
}
}
return instance;
}
/**
* The type for sign_dlc_v0 message. sign_dlc_v0 = 42782
*/
public type = DlcSignV0.type;
public contractId: Buffer;
public cetSignatures: CetAdaptorSignaturesV0;
public refundSignature: Buffer;
public fundingSignatures: FundingSignaturesV0;
public batchFundingGroups?: BatchFundingGroup[];
/**
* Converts sign_dlc_v0 to JSON
*/
public toJSON(): IDlcSignV0JSON {
const tlvs = [];
if (this.batchFundingGroups) {
this.batchFundingGroups.forEach((group) => {
tlvs.push(group.serialize());
});
}
return {
type: this.type,
contractId: this.contractId.toString('hex'),
cetSignatures: this.cetSignatures.toJSON(),
refundSignature: this.refundSignature.toString('hex'),
fundingSignatures: this.fundingSignatures.toJSON(),
tlvs,
};
}
/**
* Serializes the sign_dlc_v0 message into a Buffer
*/
public serialize(): Buffer {
const writer = new BufferWriter();
writer.writeUInt16BE(this.type);
writer.writeBytes(this.contractId);
writer.writeBytes(this.cetSignatures.serialize());
writer.writeBytes(this.refundSignature);
writer.writeBytes(this.fundingSignatures.serialize());
if (this.batchFundingGroups)
this.batchFundingGroups.forEach((fundingInfo) =>
writer.writeBytes(fundingInfo.serialize()),
);
return writer.toBuffer();
}
}
export interface IDlcSignV0JSON {
type: number;
contractId: string;
cetSignatures: ICetAdaptorSignaturesV0JSON;
refundSignature: string;
fundingSignatures: IFundingSignaturesV0JSON;
tlvs: IBatchFundingGroupJSON[];
}
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); // Adjust based on actual implementation.
container.addSign(sign);
}
return container;
}
}