@iexec/dataprotector/src/utils/getMultiaddrAsString.ts

This product enables users to confidentially store data–such as mail address, documents, personal information ...

import { multiaddr } from '@multiformats/multiaddr';

/**
 * Convert an hex string to a readable string
 * Ex:
 *  "0xa50322122038d76d7059153e707cd0951cf2ff64d17f69352a285503800c7787c3af0c63dd"
 * to
 *  "/p2p/QmSAY4mYRkCvdDzcD3A3sDeN5nChyn82p88xt7HhYHqXfi"
 */
export function getMultiaddrAsString({
  multiaddrAsHexString,
}: {
  multiaddrAsHexString?: string;
}) {
  if (!multiaddrAsHexString || multiaddrAsHexString.length < 3) {
    return undefined;
  }
  const multiAddrAsBytesArray = multiaddrAsHexString
    .slice(2)
    .match(/.{1,2}/g)
    ?.map((byte) => parseInt(byte, 16));
  if (!multiAddrAsBytesArray) {
    return undefined;
  }
  try {
    const multiaddrAsBytes = new Uint8Array(multiAddrAsBytesArray);
    const decodedMultiaddr = multiaddr(multiaddrAsBytes);
    return decodedMultiaddr.toString();
  } catch (err) {
    console.warn(
      `[getMultiaddrAsString] ERROR: "${multiaddrAsHexString}" is not a valid hex input string?`,
      err
    );
    return undefined;
  }
}