ENS Proxy SDK

Ethers client extended with on-chain ENS resolution using either a PublicEnsProxy or OwnableEnsProxy, depending on your use case.

Introduction

When resolving ENS names, you probably make a call to the ENS registry/resolver to get an address and then you execute a transaction using that address. Although uncommon, this makes you vulnerable to MITM (man in the middle) attacks, deep reorgs or any other possible attack vectors that lead to a dirty read. With the ENS proxy SDK, you can be confident that any interaction with, say "omarsayha.eth", is in fact directed to the owner of "omarsayha.eth".

There are two types of contracts that you can use to make this interaction, both with the same interface but different privileges:

PublicEnsProxy:

• This contract is accessible by anyone. As such, you should NOT give this contract any privileges. For example, you should NOT approve() ownership to transfer an ERC20 token. Some great example use cases are sending ETH to "omarsayha.eth" or using approveAndCall() to transfer ERC20 tokens to an ERC1363 compliant token
• The PublicEnsProxy is deployed at 0x4f8e7696E846E24914a32c7b1f090D91b51aaA0B. This same address is used across Mainnet, Ropsten, Rinkeby and Goerli.

OwnableEnsProxy:

• This contract is accessible by only the owner, using OpenZepplin's Ownable. To create your own ownable ens proxy, using the OwnableEnsProxyFactory.
• The OwnableEnsProxyFactory is deployed at 0xE254C5cd48206F07009Ed1C7837565707B317F15. This same address is used across Mainnet, Ropsten, Rinkeby and Goerli.

Installation

With a package manager

With Yarn:

yarn add @ens-proxy-sdk

Or with NPM:

npm install @ens-proxy-sdk

Usage

Basic Usage

Example of using PublicEnsProxy:

import { SafeEns, PUBLIC_ENS_PROXY_ADDRESS } from "ens-proxy-sdk";
import { ethers } from "ethers";

const signer = ethers.provider.getSigner();

// Use public ens to send eth to omarsayha.eth
const publicSafeEns = new SafeEns(PUBLIC_ENS_PROXY_ADDRESS, signer);
const publicSendEthTx = await publicSafeEns.sendEth(
  "omarsayha.eth",
  "100000000000000000", // NOTE: units are in wei
);
await publicSendEthTx.wait();

Example of using your own OwnableEnsProxy:

import {
  SafeEns,
  OwnableEnsProxyFactory,
  OwnableEnsProxyCreatedEvent,
  OwnableEnsProxyFactoryJson,
  OWNABLE_ENS_PROXY_FACTORY_ADDRESS,
} from "ens-proxy-sdk";
import { ethers } from "ethers";

const signer = ethers.provider.getSigner();

// Create your own ownable ens proxy
const ownableEnsProxyFactory = new Contract(
  OWNABLE_ENS_PROXY_FACTORY_ADDRESS,
  OwnableEnsProxyFactoryJson.abi,
  signer,
) as OwnableEnsProxyFactory;
await ownableEnsProxyFactory.deployed();
const createEnsProxyTx = await ownableEnsProxyFactory
  .connect(signer)
  .createEnsProxy();
const createEnsProxyTxReceipt = await createEnsProxyTx.wait();
const { ensProxyAddress } = (
  createEnsProxyTxReceipt.events?.[0] as OwnableEnsProxyCreatedEvent
).args;

// Use the created ownable ens proxy to send eth
const ownableSafeEns = new SafeEns(ensProxyAddress, signer);
const ownableSendEthTx = await ownableSafeEns.sendEth(
  "omarsayha.eth",
  "100000000000000000", // NOTE: units are in wei
);
await ownableSendEthTx.wait();