@arcblock/did/lib/util.js

Javascript lib to work with ArcBlock DID

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.toStrictHex = exports.toBytes = exports.toBits = exports.DID_PREFIX = void 0;
/* eslint-disable @typescript-eslint/ban-ts-comment */
const padStart_1 = __importDefault(require("lodash/padStart"));
const util_1 = require("@ocap/util");
const DID_PREFIX = 'did:abt:';
exports.DID_PREFIX = DID_PREFIX;
/**
 * Convert did to bytes with length of 26
 *
 * @param {string} did
 * @returns {Buffer}
 */
const toBytes = (did) => {
    try {
        if ((0, util_1.isHexStrict)(did)) {
            return Buffer.from((0, util_1.stripHexPrefix)(did), 'hex');
        }
        let bytes = (0, util_1.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: ${err.message}`);
    }
};
exports.toBytes = toBytes;
/**
 * Convert number to bit string with predefined length
 */
const toBits = (number, length) => (0, padStart_1.default)((0, util_1.toBN)(number).toString(2), length, '0');
exports.toBits = toBits;
/**
 * Ensure the hex length is even number, 2, 4, 6, 8
 *
 * @param {string} hex
 * @param {number} length
 * @returns {string} hex
 */
const toStrictHex = (hex, length) => {
    const str = hex.replace(/^0x/i, '');
    if (typeof length === 'number' && length % 2 === 0) {
        return (0, padStart_1.default)(hex, length, '0');
    }
    return str.length % 2 === 0 ? str : `0${str}`;
};
exports.toStrictHex = toStrictHex;