@node-dlc/messaging

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/messages/OracleAttestation.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> OracleAttestation.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 79.63% Statements 86/108 </div> <div class='fl pad1y space-right2'> 74.42% Branches 32/43 </div> <div class='fl pad1y space-right2'> 69.23% Functions 9/13 </div> <div class='fl pad1y space-right2'> 80% Lines 84/105 </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 medium'></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 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38x           4x 38x 38x 38x 38x   1x             3x 1x                       1x         1x         1x 1x               1x 18x 18x   18x                                                                   8x 8x   8x 8x 8x 8x 8x   8x 49x       8x 8x 49x 49x     8x 8x   8x                      </td><td class="text"><pre class="prettyprint lang-js">import { BufferReader, BufferWriter } from '@node-dlc/bufio'; import { math, verify } from 'bip-schnorr';   import { MessageType } from '../MessageType'; import { IDlcMessage } from './DlcMessage'; import { OracleAnnouncement } from './OracleAnnouncement';   /** * Oracle attestation providing signatures over an outcome value. * This represents the oracle's actual attestation to a specific outcome. * Updated to match rust-dlc specification with 2-byte count prefixes. * * An attestation from an oracle providing signatures over an outcome value. * This is what the oracle publishes when they want to attest to a specific outcome. */ export class OracleAttestation implements IDlcMessage { public static type = MessageType.OracleAttestation;   /** * Deserializes an oracle_attestation message * @param buf */ public static deserialize(buf: Buffer): OracleAttestation { const instance = new OracleAttestation(); const reader = new BufferReader(buf);   reader.readBigSize(); // read type instance.length = reader.readBigSize();   // Detect format: old rust-dlc 0.4.0 (no event_id) vs new rust-dlc (with event_id) const currentPos = reader.position;   try { // Try reading as new format (with event_id) const eventIdLength = reader.readBigSize();   // If event ID length is reasonable (0-100 bytes), assume new format if (eventIdLength >= BigInt('0') && eventIdLength <= BigInt('100')) { if (eventIdLength === BigInt('0')) { instance.eventId = ''; } else { const eventIdBuf = reader.readBytes(Number(eventIdLength)); instance.eventId = eventIdBuf.toString(); } instance.oraclePubkey = reader.readBytes(32); } else { // Event ID length is unreasonable, probably old format without event_id reader.position = currentPos; instance.eventId = ''; // Default empty event ID for old format instance.oraclePubkey = reader.readBytes(32); } } catch (error) { // If reading fails, assume old format without event_id reader.position = currentPos; instance.eventId = ''; // Default empty event ID for old format 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); }   // Handle both rust-dlc format (with u16 count prefix) and DLCSpecs format (no count prefix) // Try to detect format by checking if next 2 bytes look like a reasonable outcome count Eif (!reader.eof) { const currentPos = reader.position;   try { // Try reading as rust-dlc format (with u16 count prefix) const numOutcomes = reader.readUInt16BE();   // Validate that this looks like a reasonable count // If it's > 1000 or the remaining bytes can't accommodate this many outcomes, // it's probably not a count prefix const remainingBytes = reader.buffer.length - reader.position;   if ( numOutcomes > 0 && numOutcomes <= 1000 && remainingBytes >= numOutcomes * 2 ) { // Looks like rust-dlc format with u16 count prefix for (let i = 0; i < numOutcomes; i++) { const outcomeLen = reader.readBigSize(); const outcomeBuf = reader.readBytes(Number(outcomeLen)); instance.outcomes.push(outcomeBuf.toString()); } } else { // Reset and try DLCSpecs format (no count prefix) reader.position = currentPos; while (!reader.eof) { const outcomeLen = reader.readBigSize(); const outcomeBuf = reader.readBytes(Number(outcomeLen)); instance.outcomes.push(outcomeBuf.toString()); } } } catch (error) { // If reading as rust-dlc format fails, reset and try DLCSpecs format reader.position = currentPos; while (!reader.eof) { const outcomeLen = reader.readBigSize(); const outcomeBuf = reader.readBytes(Number(outcomeLen)); instance.outcomes.push(outcomeBuf.toString()); } } }   return instance; }   /** * The type for oracle_attestation message. oracle_attestation = 55400 */ public type = OracleAttestation.type;   public length: bigint;   /** The identifier of the announcement. */ public eventId: string;   /** The public key of the oracle (32 bytes, x-only). */ public oraclePubkey: Buffer;   /** The signatures over the event outcome (64 bytes each, Schnorr format). */ public signatures: Buffer[] = [];   /** The set of strings representing the outcome value. */ public outcomes: string[] = [];   /** * Validates the oracle attestation according to rust-dlc specification. * This includes validating signatures and ensuring consistency with announcement. * @param announcement The corresponding oracle announcement for validation (optional) * @throws Will throw an error if validation fails */ public validate(announcement?: OracleAnnouncement): void { // Basic structure validation Iif (this.signatures.length !== this.outcomes.length) { throw new Error('Number of signatures must match number of outcomes'); }   Iif (this.signatures.length === 0) { throw new Error('Must have at least one signature and outcome'); }   // Validate event ID Iif (!this.eventId || this.eventId.length === 0) { throw new Error('Event ID cannot be empty'); }   // Validate oracle public key format Iif (!this.oraclePubkey || this.oraclePubkey.length !== 32) { throw new Error('Oracle public key must be 32 bytes (x-only format)'); }   // Validate signature formats this.signatures.forEach((sig, index) => { Iif (!sig || sig.length !== 64) { throw new Error( `Signature at index ${index} must be 64 bytes (Schnorr format)`, ); } });   // Validate outcomes are not empty this.outcomes.forEach((outcome, index) => { Iif (!outcome || outcome.length === 0) { throw new Error(`Outcome at index ${index} cannot be empty`); } });   // Verify signatures over outcomes using tagged hash this.signatures.forEach((sig, index) => { const outcome = this.outcomes[index]; try { const msg = math.taggedHash('DLC/oracle/attestation/v0', outcome); verify(this.oraclePubkey, msg, sig); } catch (error) { throw new Error( `Invalid signature for outcome "${outcome}" at index ${index}: ${error.message}`, ); } });   // If announcement is provided, validate consistency if (announcement) { this.validateAgainstAnnouncement(announcement); } }   /** * Validates the attestation against the corresponding oracle announcement. * This ensures the attestation is consistent with the original announcement. * @param announcement The oracle announcement to validate against * @throws Will throw an error if validation fails */ private validateAgainstAnnouncement(announcement: OracleAnnouncement): void { // Validate oracle public key matches announcement Iif (!this.oraclePubkey.equals(announcement.oraclePubkey)) { throw new Error('Oracle public key must match announcement'); }   // Validate event ID matches Iif (this.eventId !== announcement.getEventId()) { throw new Error('Event ID must match announcement'); }   // Validate that the number of signatures matches the number of nonces in announcement const announcementNonces = announcement.getNonces(); Iif (this.signatures.length !== announcementNonces.length) { throw new Error( 'Number of signatures must match number of nonces in announcement', ); }   // Extract nonces from signatures (first 32 bytes) and compare with announcement nonces // This validates that the signatures were created using the committed nonces this.signatures.forEach((sig, index) => { const nonceFromSig = sig.slice(0, 32); const expectedNonce = announcementNonces[index];   Iif (!nonceFromSig.equals(expectedNonce)) { throw new Error( `Signature nonce mismatch at index ${index}: signature was not created with announced nonce`, ); } }); }   /** * Returns the nonces used by the oracle to sign the event outcome. * This is used for finding the matching oracle announcement. * The nonce is extracted from the first 32 bytes of each signature. */ public getNonces(): Buffer[] { return this.signatures.map((sig) => sig.slice(0, 32)); }   /** * Converts oracle_attestation to JSON */ public toJSON(): OracleAttestationJSON { 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_attestation 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); }   // Write outcomes with u16 count prefix (matching rust-dlc format) dataWriter.writeUInt16BE(this.outcomes.length); 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 OracleAttestationJSON { 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 Tue Jul 22 2025 00:10:03 GMT-0700 (Pacific 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>