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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[];
}
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