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const namehash = require('eth-ens-namehash')
const multihash = require('multihashes')
const Eth = require('ethjs-query')
const EthContract = require('ethjs-contract')
const registryAbi = require('./contracts/registry')
const resolverAbi = require('./contracts/resolver')
module.exports = resolveEnsToIpfsContentId
async function resolveEnsToIpfsContentId ({ provider, name }) {
const eth = new Eth(provider)
const hash = namehash.hash(name)
const contract = new EthContract(eth)
// lookup registry
const chainId = Number.parseInt(await eth.net_version(), 10)
const registryAddress = getRegistryForChainId(chainId)
if (!registryAddress) {
throw new Error(`EnsIpfsResolver - no known ens-ipfs registry for chainId "${chainId}"`)
}
const Registry = contract(registryAbi).at(registryAddress)
// lookup resolver
const resolverLookupResult = await Registry.resolver(hash)
const resolverAddress = resolverLookupResult[0]
if (hexValueIsEmpty(resolverAddress)) {
throw new Error(`EnsIpfsResolver - no resolver found for name "${name}"`)
}
const Resolver = contract(resolverAbi).at(resolverAddress)
// lookup content id
const contentLookupResult = await Resolver.content(hash)
const contentHash = contentLookupResult[0]
if (hexValueIsEmpty(contentHash)) {
throw new Error(`EnsIpfsResolver - no content ID found for name "${name}"`)
}
const nonPrefixedHex = contentHash.slice(2)
const buffer = multihash.fromHexString(nonPrefixedHex)
const contentId = multihash.toB58String(multihash.encode(buffer, 'sha2-256'))
return contentId
}
function hexValueIsEmpty (value) {
return [undefined, null, '0x', '0x0', '0x0000000000000000000000000000000000000000000000000000000000000000'].includes(value)
}
function getRegistryForChainId (chainId) {
switch (chainId) {
// mainnet
case 1:
return '0x314159265dd8dbb310642f98f50c066173c1259b'
// ropsten
case 3:
return '0x112234455c3a32fd11230c42e7bccd4a84e02010'
}
}
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