signify-ts/src/keri/core/seqner.ts

Signing at the edge for KERI, ACDC, and KERIA

import { Matter, MatterArgs, MtrDex } from './matter';
import { intToBytes, bytesToInt } from './utils';
/**
 * @description  Seqner: subclass of Matter, cryptographic material, for ordinal numbers
 * such as sequence numbers or first seen ordering numbers.
 * Seqner provides fully qualified format for ordinals (sequence numbers etc)
 * when provided as attached cryptographic material elements.
 */
export class Seqner extends Matter {
    constructor({
        raw,
        code = MtrDex.Salt_128,
        qb64,
        qb64b,
        qb2,
        sn,
        snh,
        ...kwa
    }: MatterArgs & { sn?: number; snh?: string }) {
        if (!raw && !qb64b && !qb64 && !qb2) {
            if (sn === undefined) {
                if (snh === undefined) {
                    sn = 0;
                } else {
                    sn = parseInt(snh, 16);
                }
            }

            raw = intToBytes(sn, Matter._rawSize(MtrDex.Salt_128));
        }

        super({ raw, code, qb64, qb64b, qb2, ...kwa });

        if (this.code !== MtrDex.Salt_128) {
            throw new Error(`Invalid code = ${this.code} for Seqner.`);
        }
    }

    get sn(): number {
        return bytesToInt(this.raw); //To check if other readUInt64 is needed
    }

    get snh(): string {
        return this.sn.toString(16);
    }
}