@arcblock/did/esm/util.js

Javascript lib to work with ArcBlock DID

/* eslint-disable @typescript-eslint/ban-ts-comment */
import padStart from 'lodash/padStart';
import { toBN, fromBase58, isHexStrict, stripHexPrefix } from '@ocap/util';
const DID_PREFIX = 'did:abt:';
/**
 * Convert did to bytes with length of 26
 *
 * @param {string} did
 * @returns {Buffer}
 */
const toBytes = (did) => {
    try {
        if (isHexStrict(did)) {
            return Buffer.from(stripHexPrefix(did), 'hex');
        }
        let bytes = fromBase58(did.replace(DID_PREFIX, ''));
        while (bytes.length < 26) {
            bytes = Buffer.concat([Buffer.from([0]), bytes]);
        }
        return bytes;
    }
    catch (err) {
        // @ts-ignore
        throw new Error(`Cannot convert DID string to byte array: ${err.message}`);
    }
};
/**
 * Convert number to bit string with predefined length
 */
const toBits = (number, length) => padStart(toBN(number).toString(2), length, '0');
/**
 * Ensure the hex length is even number, 2, 4, 6, 8
 *
 * @param {string} hex
 * @param {number} length
 * @returns {string} hex
 */
const toStrictHex = (hex, length) => {
    const str = hex.replace(/^0x/i, '');
    if (typeof length === 'number' && length % 2 === 0) {
        return padStart(hex, length, '0');
    }
    return str.length % 2 === 0 ? str : `0${str}`;
};
export { DID_PREFIX, toBits, toBytes, toStrictHex };