blob: fe2dc11340b47d165e141da54baf544009f743c4 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
const namehash = require('eth-ens-namehash')
const multihash = require('multihashes')
const Eth = require('ethjs-query')
const EthContract = require('ethjs-contract')
const registrarAbi = require('./contracts/registrar')
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 registrar
const chainId = Number.parseInt(await eth.net_version(), 10)
const registrarAddress = getRegistrarForChainId(chainId)
if (!registrarAddress) {
throw new Error(`EnsIpfsResolver - no known ens-ipfs registrar for chainId "${chainId}"`)
}
const Registrar = contract(registrarAbi).at(registrarAddress)
// lookup resolver
const resolverLookupResult = await Registrar.resolver(hash)
const resolverAddress = resolverLookupResult[0]
if (hexValueIsEmpty(resolverAddress)) {
throw new Error(`EnsIpfsResolver - no resolver found for name "${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 getRegistrarForChainId (chainId) {
switch (chainId) {
// mainnet
case 1:
return '0x314159265dd8dbb310642f98f50c066173c1259b'
// ropsten
case 3:
return '0x112234455c3a32fd11230c42e7bccd4a84e02010'
}
}
|
