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const namehash = require('eth-ens-namehash')
const multihash = require('multihashes')
const REGISTRAR_ENS_MAIN_NET = '0x314159265dd8dbb310642f98f50c066173c1259b'
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(provider.rpcTarget))
const hash = namehash.hash(name)
const contract = new EthContract(eth)
const Registrar = contract(registrarAbi).at(REGISTRAR_ENS_MAIN_NET)
return new Promise((resolve, reject) => {
if (provider.type !== 'mainnet') reject('unsupport')
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(buf))
} else {
reject(null)
}
})
})
}
module.exports.resolve = function (name, provider) {
const path = name.split('.')
const tld = path[path.length - 1]
if (tld === 'eth') {
return ens(name, provider)
} else {
return new Promise((resolve, reject) => {
reject(null)
})
}
}
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