classic-ui/store/snark.js

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2022-04-22 06:05:56 +03:00
/* eslint-disable no-console */
import Web3 from 'web3'
import Jszip from 'jszip'
import axios from 'axios'
import ENS, { getEnsAddress } from '@ensdomains/ensjs'
import { detectMob } from '@/utils'
import networkConfig from '@/networkConfig'
const { APP_ENS_NAME } = process.env
const groth16 = require('websnark/src/groth16')
const jszip = new Jszip()
function buildGroth16() {
const isMobile = detectMob()
const wasmMemory = isMobile ? 1000 : 2000
return groth16({ wasmInitialMemory: wasmMemory })
}
function getEns() {
const provider = new Web3.providers.HttpProvider(networkConfig.netId1.rpcUrls.Infura.url)
return new ENS({ provider, ensAddress: getEnsAddress('1') })
}
async function getTornadoKeys(getProgress) {
try {
const keys = await Promise.all([
download({ name: 'tornado.json.zip', contentType: 'string' }),
download({ name: 'tornadoProvingKey.bin.zip', contentType: 'arraybuffer', getProgress })
])
return { circuit: JSON.parse(keys[0]), provingKey: keys[1] }
} catch (err) {
throw err
}
}
async function getIPFSIdFromENS(ensName) {
try {
const ens = getEns()
const ensInterface = await ens.name(ensName)
const { value } = await ensInterface.getContent(ensName)
const [, id] = value.split('://')
return id
} catch (err) {
throw new Error(err)
}
}
async function fetchFile({ url, name, getProgress, id, retryAttempt = 0 }) {
try {
const response = await axios.get(`${url}/${name}`, {
responseType: 'blob',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
onDownloadProgress: (progressEvent) => {
if (typeof getProgress === 'function') {
const progress = Math.round((progressEvent.loaded * 100) / 9626311)
getProgress(progress)
}
}
})
return response
} catch (err) {
if (!id) {
id = await getIPFSIdFromENS(APP_ENS_NAME)
}
const knownResources = [
url,
`https://ipfs.io/ipfs/${id}`,
`https://dweb.link/ipfs/${id}`,
`https://gateway.pinata.cloud/ipfs/${id}`
]
if (retryAttempt < knownResources.length) {
const fallbackUrl = knownResources[retryAttempt]
retryAttempt++
const response = await fetchFile({ name, getProgress, retryAttempt, id, url: fallbackUrl })
return response
}
throw err
}
}
/**
* Function to download
* @param {*} name filename
* @param {'base64'|'string'|'binarystring'|'text'|'blob'|'uint8array'|'arraybuffer'|'array'|'nodebuffer'} contentType type of the content.
* @param getProgress function
*/
async function download({ name, contentType, getProgress, eventName = 'events' }) {
try {
// eslint-disable-next-line no-undef
const prefix = __webpack_public_path__.slice(0, -7)
const response = await fetchFile({ getProgress, url: prefix, name })
const zip = await jszip.loadAsync(response.data)
const file = zip.file(name.replace(`${eventName}/`, '').slice(0, -4))
const content = await file.async(contentType)
return content
} catch (err) {
throw err
}
}
export { getTornadoKeys, buildGroth16, download }