@arcblock/did/esm/util.mjs

Javascript lib to work with ArcBlock DID

import { fromBase58, isHexStrict, stripHexPrefix, toBN } from "@ocap/util";
import padStart from "lodash/padStart.js";

//#region src/util.ts
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:[a-z0-9]+:/, ""));
		while (bytes.length < 26) bytes = Buffer.concat([Uint8Array.from([0]), Uint8Array.from(bytes)]);
		return bytes;
	} catch (err) {
		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}`;
};

//#endregion
export { DID_PREFIX, toBits, toBytes, toStrictHex };