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87 lines
2.9 KiB
87 lines
2.9 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 contentHash from '@ensdomains/content-hash';
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import registryAbi from './contracts/registry';
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import resolverAbi from './contracts/resolver';
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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(
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`EnsIpfsResolver - no known ens-ipfs registry for chainId "${chainId}"`,
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);
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}
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const Registry = contract(registryAbi).at(registryAddress);
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// lookup resolver
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const resolverLookupResult = await Registry.resolver(hash);
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const resolverAddress = resolverLookupResult[0];
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if (hexValueIsEmpty(resolverAddress)) {
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throw new Error(`EnsIpfsResolver - no resolver found for name "${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' || type === 'ipns-ns') {
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decodedContentHash = contentHash.helpers.cidV0ToV1Base32(
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decodedContentHash,
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);
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}
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return { 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(
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`EnsIpfsResolver - no content ID found for name "${name}"`,
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);
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}
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return { type: 'swarm-ns', hash: content.slice(2) };
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}
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throw new Error(
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`EnsIpfsResolver - the resolver for name "${name}" is not standard, it should either supports contenthash() or content()`,
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);
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}
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function hexValueIsEmpty(value) {
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return [
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undefined,
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null,
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'0x',
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'0x0',
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'0x0000000000000000000000000000000000000000000000000000000000000000',
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].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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case 3:
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case 4:
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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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