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