const namehash = require('eth-ens-namehash') const multihash = require('multihashes') const HttpProvider = require('ethjs-provider-http') const Eth = require('ethjs-query') const EthContract = require('ethjs-contract') const registrarAbi = require('./contracts/registrar') const resolverAbi = require('./contracts/resolver') function ens (name, provider) { const eth = new Eth(new HttpProvider(getProvider(provider.type))) const hash = namehash.hash(name) const contract = new EthContract(eth) const Registrar = contract(registrarAbi).at(getRegistrar(provider.type)) return new Promise((resolve, reject) => { if (provider.type === 'mainnet' || provider.type === 'ropsten') { Registrar.resolver(hash).then((address) => { if (address === '0x0000000000000000000000000000000000000000') { reject(null) } else { const Resolver = contract(resolverAbi).at(address['0']) return Resolver.content(hash) } }).then((contentHash) => { if (contentHash['0'] === '0x0000000000000000000000000000000000000000000000000000000000000000') reject(null) if (contentHash.ret !== '0x') { const hex = contentHash['0'].substring(2) const buf = multihash.fromHexString(hex) resolve(multihash.toB58String(multihash.encode(buf, 'sha2-256'))) } else { reject(null) } }) } else { return reject('unsupport') } }) } function getProvider (type) { switch (type) { case 'mainnet': return 'https://mainnet.infura.io/' case 'ropsten': return 'https://ropsten.infura.io/' default: return 'http://localhost:8545/' } } function getRegistrar (type) { switch (type) { case 'mainnet': return '0x314159265dd8dbb310642f98f50c066173c1259b' case 'ropsten': return '0x112234455c3a32fd11230c42e7bccd4a84e02010' default: return '0x0000000000000000000000000000000000000000' } } module.exports.resolve = function (name, provider) { const path = name.split('.') const topLevelDomain = path[path.length - 1] if (topLevelDomain === 'eth' || topLevelDomain === 'test') { return ens(name, provider) } else { return new Promise((resolve, reject) => { reject(null) }) } }