@authereum/resolution/src/ens/contract/resolver.ts

Domain Resolution for blockchain domains

import { ResolutionError, ResolutionErrorCode } from '../../errors/resolutionError';
import { default as newResolver } from './newResolver';
import { default as oldResolver } from './oldResolver';
import { EthCoinIndex } from '../../types';
import { NamingServiceName } from '../../publicTypes';
import { JsonFragment } from '@ethersproject/abi';

export const OldResolverAddresses = [
  '0x5ffc014343cd971b7eb70732021e26c35b744cc4',
  '0x1da022710df5002339274aadee8d58218e9d6ab5',
  '0xda1756bb923af5d1a05e277cb1e54f1d0a127890',
];


export default (addr: string, coinType?: string): JsonFragment[] => {
  if (coinType === undefined || coinType === EthCoinIndex) {
    // Old interface is only compatible to output the ETH address
    // New interface is compatible to that API
    // So we prefer old interface when currency is ETH
    return oldResolver;
  } else {
    if (OldResolverAddresses.includes(addr.toLowerCase())) {
      throw new ResolutionError(
        ResolutionErrorCode.IncorrectResolverInterface,
        { method: NamingServiceName.ENS },
      );
    }

    return newResolver;
  }
};