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NNS v2 resolver integration #867

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NNS v2 resolver integration #867

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29 changes: 17 additions & 12 deletions packages/nouns-webapp/src/utils/lookupNNSOrENS.ts
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Original file line number Diff line number Diff line change
@@ -1,8 +1,18 @@
import { Web3Provider } from '@ethersproject/providers';
import { BigNumber as EthersBN, utils } from 'ethers';
import { Contract, providers, utils } from 'ethers';
import { createNetworkHttpUrl } from '../config';

const NOUNS_CLD_ID = utils.namehash('nouns');

const resolver = new Contract(
// https://basescan.org/address/0xF4Cc2b5F631998eBc7fA362aEE30141C5a10F519
'0x78997D8ca4316421620A09f015512D779Dc34217',
['function reverseNameOf(address, uint256[], bool) view returns (string)'],
new providers.JsonRpcProvider(createNetworkHttpUrl('base-mainnet')),
);

/**
* Look up either NNS or ENS (using NNS contract to resolve NNS with ENS fallback)
* Look up NNS and fallback to ENS
* @param library provider
* @param address Address to resolve
* @returns NNS or ENS or null (if neither resolve)
Expand All @@ -12,16 +22,11 @@ export async function lookupNNSOrENS(
address: string,
): Promise<string | null> {
try {
// Call resolver contract
const res = await library.call({
to: '0x849f92178950f6254db5d16d1ba265e70521ac1b', // see https://etherscan.io/address/0x849f92178950f6254db5d16d1ba265e70521ac1b
data: `0x55ea6c47000000000000000000000000${address.substring(2)}`, // call .resolve(address) method
});
// Parse result into a string.
const offset = EthersBN.from(utils.hexDataSlice(res, 0, 32)).toNumber();
const length = EthersBN.from(utils.hexDataSlice(res, offset, offset + 32)).toNumber();
const data = utils.hexDataSlice(res, offset + 32, offset + 32 + length);
return utils.toUtf8String(data) || null;
const name = await resolver.reverseNameOf(address, [NOUNS_CLD_ID], true);
if (!name) {
return library.lookupAddress(address);
}
return name;
} catch (e) {
return null;
}
Expand Down