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metamask-extension/app/scripts/controllers/ens/index.js
2020-12-16 13:14:49 -08:00

96 lines
2.2 KiB
JavaScript

import punycode from 'punycode/punycode'
import ethUtil from 'ethereumjs-util'
import { ObservableStore } from '@metamask/obs-store'
import log from 'loglevel'
import Ens from './ens'
const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000'
const ZERO_X_ERROR_ADDRESS = '0x'
export default class EnsController {
constructor({ ens, provider, networkStore } = {}) {
const initState = {
ensResolutionsByAddress: {},
}
this._ens = ens
if (!this._ens) {
const network = networkStore.getState()
if (Ens.getNetworkEnsSupport(network)) {
this._ens = new Ens({
network,
provider,
})
}
}
this.store = new ObservableStore(initState)
networkStore.subscribe((network) => {
this.store.putState(initState)
if (Ens.getNetworkEnsSupport(network)) {
this._ens = new Ens({
network,
provider,
})
} else {
delete this._ens
}
})
}
reverseResolveAddress(address) {
return this._reverseResolveAddress(ethUtil.toChecksumAddress(address))
}
async _reverseResolveAddress(address) {
if (!this._ens) {
return undefined
}
const state = this.store.getState()
if (state.ensResolutionsByAddress[address]) {
return state.ensResolutionsByAddress[address]
}
let domain
try {
domain = await this._ens.reverse(address)
} catch (error) {
log.debug(error)
return undefined
}
let registeredAddress
try {
registeredAddress = await this._ens.lookup(domain)
} catch (error) {
log.debug(error)
return undefined
}
if (
registeredAddress === ZERO_ADDRESS ||
registeredAddress === ZERO_X_ERROR_ADDRESS
) {
return undefined
}
if (ethUtil.toChecksumAddress(registeredAddress) !== address) {
return undefined
}
this._updateResolutionsByAddress(address, punycode.toASCII(domain))
return domain
}
_updateResolutionsByAddress(address, domain) {
const oldState = this.store.getState()
this.store.putState({
ensResolutionsByAddress: {
...oldState.ensResolutionsByAddress,
[address]: domain,
},
})
}
}