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76 lines
2.8 KiB
76 lines
2.8 KiB
import namehash from 'eth-ens-namehash'
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import Eth from 'ethjs-query'
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import EthContract from 'ethjs-contract'
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import registryAbi from './contracts/registry'
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import resolverAbi from './contracts/resolver'
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import contentHash from 'content-hash'
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export default 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 registry
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const chainId = Number.parseInt(await eth.net_version(), 10)
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const registryAddress = getRegistryForChainId(chainId)
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if (!registryAddress) {
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throw new Error(`EnsIpfsResolver - no known ens-ipfs registry for chainId "${chainId}"`)
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}
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const Registry = contract(registryAbi).at(registryAddress)
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// lookup resolver
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const resolverLookupResult = await Registry.resolver(hash)
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const resolverAddress = resolverLookupResult[0]
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if (hexValueIsEmpty(resolverAddress)) {
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throw new Error(`EnsIpfsResolver - no resolver found for name "${name}"`)
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}
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const Resolver = contract(resolverAbi).at(resolverAddress)
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const isEIP1577Compliant = await Resolver.supportsInterface('0xbc1c58d1')
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const isLegacyResolver = await Resolver.supportsInterface('0xd8389dc5')
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if (isEIP1577Compliant[0]) {
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const contentLookupResult = await Resolver.contenthash(hash)
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const rawContentHash = contentLookupResult[0]
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let decodedContentHash = contentHash.decode(rawContentHash)
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const type = contentHash.getCodec(rawContentHash)
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if (type === 'ipfs-ns') {
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decodedContentHash = contentHash.helpers.cidV0ToV1Base32(decodedContentHash)
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}
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return { type: type, hash: decodedContentHash }
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}
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if (isLegacyResolver[0]) {
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// lookup content id
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const contentLookupResult = await Resolver.content(hash)
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const content = contentLookupResult[0]
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if (hexValueIsEmpty(content)) {
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throw new Error(`EnsIpfsResolver - no content ID found for name "${name}"`)
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}
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return { type: 'swarm-ns', hash: content.slice(2) }
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}
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throw new Error(`EnsIpfsResolver - the resolver for name "${name}" is not standard, it should either supports contenthash() or content()`)
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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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/**
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* Returns the registry address for the given chain ID
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* @param {number} chainId the chain ID
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* @returns {string|null} the registry address if known, null otherwise
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*/
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function getRegistryForChainId (chainId) {
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switch (chainId) {
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case 1:
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// falls through
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case 3:
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// falls through
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case 4:
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// falls through
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case 5:
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// Mainnet, Ropsten, Rinkeby, and Goerli, respectively, use the same address
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return '0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e'
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default:
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return null
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}
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}
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