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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | 1x 1x 1x 1x 1x 1x 1x 63x 63x 63x 63x 63x 63x 63x 63x 69x 28x 27x 27x 5x 33x 33x 33x 33x 33x 33x 33x 33x 33x | import { BufferReader, BufferWriter } from '@node-dlc/bufio';
import { math, verify } from 'bip-schnorr';
import { MessageType } from '../MessageType';
import { getTlv } from '../serialize/getTlv';
import { IDlcMessage } from './DlcMessage';
import { IOracleEventV0JSON, OracleEventV0 } from './OracleEventV0';
/**
* 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 OracleAnnouncementV0 implements IDlcMessage {
public static type = MessageType.OracleAnnouncementV0;
/**
* Deserializes an oracle_announcement_v0 message
* @param buf
*/
public static deserialize(buf: Buffer): OracleAnnouncementV0 {
const instance = new OracleAnnouncementV0();
const reader = new BufferReader(buf);
reader.readBigSize(); // read type
instance.length = reader.readBigSize();
instance.announcementSig = reader.readBytes(64);
instance.oraclePubkey = reader.readBytes(32);
instance.oracleEvent = OracleEventV0.deserialize(getTlv(reader));
return instance;
}
/**
* The type for oracle_announcement_v0 message. oracle_announcement_v0 = 55332
*/
public type = OracleAnnouncementV0.type;
public length: bigint;
public announcementSig: Buffer;
public oraclePubkey: Buffer;
public oracleEvent: OracleEventV0;
public validate(): void {
this.oracleEvent.validate();
// Verify announcement sig
const msg = math.taggedHash(
'DLC/oracle/announcement/v0',
this.oracleEvent.serialize(),
);
verify(this.oraclePubkey, msg, this.announcementSig);
}
/**
* Converts oracle_announcement_v0 to JSON
*/
public toJSON(): OracleAnnouncementV0JSON {
return {
type: this.type,
announcementSig: this.announcementSig.toString('hex'),
oraclePubkey: this.oraclePubkey.toString('hex'),
oracleEvent: this.oracleEvent.toJSON(),
};
}
/**
* 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.writeBytes(this.announcementSig);
dataWriter.writeBytes(this.oraclePubkey);
dataWriter.writeBytes(this.oracleEvent.serialize());
writer.writeBigSize(dataWriter.size);
writer.writeBytes(dataWriter.toBuffer());
return writer.toBuffer();
}
}
export interface OracleAnnouncementV0JSON {
type: number;
announcementSig: string;
oraclePubkey: string;
oracleEvent: IOracleEventV0JSON;
}
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