@node-dlc/messaging

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/messages/DlcAccept.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../prettify.css" /> <link rel="stylesheet" href="../../base.css" /> <link rel="shortcut icon" type="image/x-icon" href="../../favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="../../index.html">All files</a> / <a href="index.html">lib/messages</a> DlcAccept.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 93.62% Statements 132/141 </div> <div class='fl pad1y space-right2'> 80% Branches 20/25 </div> <div class='fl pad1y space-right2'> 85.71% Functions 18/21 </div> <div class='fl pad1y space-right2'> 93.48% Lines 129/138 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a href='#L16'>16</a> <a name='L17'></a><a href='#L17'>17</a> <a name='L18'></a><a href='#L18'>18</a> <a name='L19'></a><a href='#L19'>19</a> <a name='L20'></a><a href='#L20'>20</a> <a name='L21'></a><a href='#L21'>21</a> <a name='L22'></a><a href='#L22'>22</a> <a 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  14x           33x                       33x                                       1x     1x 1x 1x   1x                               7x 7x   1x     6x 6x   1x           5x 4x 1x     1x         3x 4x     3x 1x       2x                                   1x   1x           1x             1x                           13x 13x 13x 13x 13x 13x 13x 13x 13x   13x 13x     13x 13x 13x 13x 13x 13x   13x 1x 1x     13x       1x                             1x   1x 1x 1x 1x 1x 1x 1x 1x 1x 1x                                                         1x 2x             4x                               3x   3x   3x 6x   6x 6x   3x                 1x 1x 1x 1x 2x 2x 2x 2x   1x      </td><td class="text"><pre class="prettyprint lang-js">import { Script } from '@node-dlc/bitcoin'; 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 = ne