@node-dlc/messaging

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/messages/OracleAttestationV0.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> OracleAttestationV0.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 93.88% Statements 46/49 </div> <div class='fl pad1y space-right2'> 50% Branches 1/2 </div> <div class='fl pad1y space-right2'> 66.67% Functions 4/6 </div> <div class='fl pad1y space-right2'> 93.62% Lines 44/47 </div> </div> Press n or j to go to the next uncovered block, 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lang-js">import { BufferReader, BufferWriter } from '@node-dlc/bufio'; import { math, verify } from 'bip-schnorr';   import { MessageType } from '../MessageType'; import { IDlcMessage } from './DlcMessage';   /** * In order to make it possible to hold oracles accountable in cases where * they do not release a signature for an event outcome, there needs to be * a proof that an oracle has committed to a given outcome. This proof is * given in a so-called oracle announcement, which contains an oracle event * together with the oracle public key and a signature over its serialization, * which must be valid with respect to the specified public key. * * This also makes it possible for users to obtain oracle event information * from an un-trusted peer while being guaranteed that it originates from a * given oracle. */ export class OracleAttestationV0 implements IDlcMessage { public static type = MessageType.OracleAttestationV0;   /** * Deserializes an oracle_announcement_v0 message * @param buf */ public static deserialize(buf: Buffer): OracleAttestationV0 { const instance = new OracleAttestationV0(); const reader = new BufferReader(buf);   reader.readBigSize(); // read type instance.length = reader.readBigSize();   const eventIdLength = reader.readBigSize(); const eventIdBuf = reader.readBytes(Number(eventIdLength)); instance.eventId = eventIdBuf.toString();   instance.oraclePubkey = reader.readBytes(32);   const numSignatures = reader.readUInt16BE();   for (let i = 0; i < numSignatures; i++) { const signature = reader.readBytes(64); instance.signatures.push(signature); }   while (!reader.eof) { const outcomeLen = reader.readBigSize(); const outcomeBuf = reader.readBytes(Number(outcomeLen)); instance.outcomes.push(outcomeBuf.toString()); }   return instance; }   /** * The type for oracle_announcement_v0 message. oracle_announcement_v0 = 55332 */ public type = OracleAttestationV0.type;   public length: bigint;   public eventId: string;   public oraclePubkey: Buffer;   public signatures: Buffer[] = [];   public outcomes: string[] = [];   public validate(): void { Iif (this.signatures.length !== this.outcomes.length) { throw Error('signature and outcome length must be the same'); }   // Verify attestation outcome signatures for (let i = 0; i < this.signatures.length; i++) { const msg = math.taggedHash( 'DLC/oracle/attestation/v0', this.outcomes[i], ); verify(this.oraclePubkey, msg, this.signatures[i]); } }   /** * Converts oracle_attestation_v0 to JSON */ public toJSON(): OracleAttestationV0JSON { return { type: this.type, eventId: this.eventId, oraclePubkey: this.oraclePubkey.toString('hex'), signatures: this.signatures.map((sig) => sig.toString('hex')), outcomes: this.outcomes, }; }   /** * Serializes the oracle_announcement_v0 message into a Buffer */ public serialize(): Buffer { const writer = new BufferWriter(); writer.writeBigSize(this.type);   const dataWriter = new BufferWriter(); dataWriter.writeBigSize(this.eventId.length); dataWriter.writeBytes(Buffer.from(this.eventId)); dataWriter.writeBytes(this.oraclePubkey); dataWriter.writeUInt16BE(this.signatures.length);   for (const signature of this.signatures) { dataWriter.writeBytes(signature); }   for (const outcome of this.outcomes) { dataWriter.writeBigSize(outcome.length); dataWriter.writeBytes(Buffer.from(outcome)); }   writer.writeBigSize(dataWriter.size); writer.writeBytes(dataWriter.toBuffer());   return writer.toBuffer(); } }   export interface OracleAttestationV0JSON { type: number; eventId: string; oraclePubkey: string; signatures: string[]; outcomes: string[]; }  </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Sun Jun 08 2025 20:55:53 GMT-0400 (Eastern Daylight Saving Time) </div> </div> <script src="../../prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="../../sorter.js"></script> <script src="../../block-navigation.js"></script> </body> </html>