535 lines
16 KiB
JavaScript
535 lines
16 KiB
JavaScript
import { AES, HmacSHA256, enc } from 'crypto-js'
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import { isEmpty } from 'lodash'
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import { BigNumber, Contract } from 'ethers'
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import { poseidon } from '@tornado/circomlib'
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import { decrypt } from 'eth-sig-util'
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import { IndexedDB } from '../services/idb'
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import { BatchEventsService } from '../services/events/batch'
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import { getAllCommitments } from '../services/graph'
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import { ExtendedProvider } from '../services/provider'
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import { POOL_CONTRACT, RPC_LIST, FALLBACK_RPC_LIST, workerEvents, numbers } from './services/constants'
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import { sleep } from './services/utilities'
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import { poolAbi } from './services/pool'
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import { downloadEvents } from './services/downloadEvents'
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const getProviderWithSigner = (chainId) => {
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return new ExtendedProvider(RPC_LIST[chainId], chainId, FALLBACK_RPC_LIST[chainId])
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}
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const initDataBase = async () => {
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try {
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const options = {
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stores: [
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{
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keyPath: 'index',
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name: `commitment_events_100`,
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indexes: [
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{ name: 'transactionHash', unique: false },
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{ name: 'commitment', unique: true },
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],
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},
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{
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keyPath: 'id',
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name: `decrypted_events_100`,
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indexes: [{ name: 'hash', unique: true }],
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},
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{
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keyPath: 'name',
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name: `last_sync_event`,
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indexes: [{ name: 'name', unique: false }],
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},
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],
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dbName: 'tornado_pool_events',
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}
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const instance = new IndexedDB(options)
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await instance.initDB()
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self.$indexedDB = instance
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} catch (err) {
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console.log('err', err.message)
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}
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}
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const initWorker = (chainId) => {
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self.chainId = chainId
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const provider = getProviderWithSigner(chainId)
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setTornadoPool(chainId, provider)
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}
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const setTornadoPool = (chainId, provider) => {
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self.poolContract = new Contract(POOL_CONTRACT[chainId], poolAbi, provider)
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self.BatchEventsService = new BatchEventsService({
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provider,
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contract: self.poolContract
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})
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}
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const getCommitmentBatch = async ({ blockFrom, blockTo, cachedEvents, withCache }) => {
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const events = []
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let { events: graphEvents, lastSyncBlock } = await getAllCommitments({
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fromBlock: blockFrom,
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toBlock: blockTo,
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chainId
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})
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if (lastSyncBlock) {
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graphEvents = graphEvents
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.filter(({ blockNumber }) => {
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if (blockFrom && blockTo) {
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return Number(blockFrom) <= Number(blockNumber) && Number(blockNumber) <= Number(blockTo)
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} else if (blockTo) {
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return Number(blockNumber) <= Number(blockTo)
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}
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// does not filter by default
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return true
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})
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.map(({ blockNumber, transactionHash, index, commitment, encryptedOutput }) => ({
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blockNumber,
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transactionHash,
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index: Number(index),
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commitment,
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encryptedOutput,
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}))
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console.log({
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graphEvents
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})
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events.push(...graphEvents)
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blockFrom = lastSyncBlock
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}
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if (!blockTo || blockTo > blockFrom) {
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let nodeEvents = await self.BatchEventsService.getBatchEvents({
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fromBlock: blockFrom,
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toBlock: blockTo,
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type: 'NewCommitment'
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})
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if (nodeEvents && nodeEvents.length) {
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nodeEvents = nodeEvents.map(({ blockNumber, transactionHash, args }) => ({
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blockNumber,
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transactionHash,
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index: Number(args.index),
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commitment: args.commitment,
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encryptedOutput: args.encryptedOutput,
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}))
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console.log({
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nodeEvents
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})
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events.push(...nodeEvents)
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}
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}
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return events.filter((el) => {
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if (!withCache && cachedEvents && cachedEvents.length) {
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return cachedEvents.find((cached) => {
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return el.transactionHash === cached.transactionHash && el.index === cached.index
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})
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}
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return true
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})
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}
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const getCommitments = async ({ withCache, lastSyncBlock }) => {
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try {
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let blockFrom = numbers.DEPLOYED_BLOCK
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if (!self.$indexedDB) {
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await sleep(numbers.RECALL_DELAY)
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}
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let cachedEvents = await self.$indexedDB.getAll({
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storeName: 'commitment_events_100',
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})
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if (!cachedEvents) {
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cachedEvents = []
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}
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if (!lastSyncBlock) {
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lastSyncBlock = await getLastSyncBlock()
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}
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const currentBlock = await self.poolContract.provider.getBlockNumber()
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if (lastSyncBlock && cachedEvents.length) {
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const newBlockFrom = Number(lastSyncBlock) + numbers.ONE
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if (Number(lastSyncBlock) === currentBlock) {
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return { commitmentEvents: cachedEvents }
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}
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blockFrom = newBlockFrom > currentBlock ? currentBlock : newBlockFrom
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} else {
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const downloadedEvents = await downloadEvents(`commitments_${self.chainId}.json`, blockFrom)
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if (downloadedEvents.events.length) {
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cachedEvents.push(...downloadedEvents.events)
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blockFrom = downloadedEvents.lastBlock
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}
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}
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const commitmentEvents = await getCommitmentBatch({ blockFrom, blockTo: currentBlock, cachedEvents, withCache })
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return {
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newCommitmentEvents: commitmentEvents,
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commitmentEvents: withCache ? cachedEvents.concat(commitmentEvents) : commitmentEvents,
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}
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} catch (err) {
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throw new Error(`Method NEW getCommitmentEvents has error: ${err.message}`)
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}
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}
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const decryptCommitmentEvent = ({ commitmentEvent, privateKey, bgPublicKey }) => {
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const buf = keyPairDecrypt(commitmentEvent.encryptedOutput, privateKey)
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const index = BigNumber.from(commitmentEvent.index).toNumber()
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const amount = BigNumber.from('0x' + getHex(buf, numbers.ZERO, numbers.BYTES_31))
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const blinding = BigNumber.from('0x' + getHex(buf, numbers.BYTES_31, numbers.BYTES_62))
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const { commitment, nullifier } = getNullifier({
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index,
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amount,
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blinding,
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privateKey,
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publicKey: bgPublicKey,
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})
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const nullifierHash = nullifier._hex.slice(numbers.TWO).padStart(numbers.NULLIFIER_LENGTH, '0x00000')
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return {
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index,
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amount,
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blinding,
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nullifier,
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commitment,
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nullifierHash,
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blockNumber: commitmentEvent.blockNumber,
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transactionHash: commitmentEvent.transactionHash,
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}
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}
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const decryptCommitmentEvents = ({ publicKey, privateKey, commitmentEvents }) => {
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try {
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const decrypted = []
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const commitments = []
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const bgPublicKey = BigNumber.from(publicKey)
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for (const commitmentEvent of commitmentEvents) {
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try {
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const decryptedEvent = decryptCommitmentEvent({ commitmentEvent, privateKey, bgPublicKey })
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decrypted.push(decryptedEvent)
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commitments.push(commitmentEvent)
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} catch (err) {
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continue
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}
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}
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return { decrypted, commitments }
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} catch (err) {
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throw new Error(err.message)
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}
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}
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const getEvents = async ({ key, indexName, storeName }) => {
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try {
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const lastEvents = await self.$indexedDB.getAllFromIndex({ key, indexName, storeName })
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return lastEvents
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} catch (err) {
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throw new Error(`getEvents has error: ${err.message}`)
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}
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}
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const saveEvents = async ({ events, storeName }) => {
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try {
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const isIdbEnable = await getIsDBEnabled()
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if (isIdbEnable || !getIsWhitelistedDomain() || isEmpty(events)) {
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return
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}
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self.$indexedDB.createMultipleTransactions({
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storeName,
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data: events,
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})
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} catch (err) {
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console.error(`saveEvents has error: ${err.message}`)
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}
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}
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// listener handlers
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const getCommitmentEvents = async ({ publicKey, lastSyncBlock, withCache = true }, [port]) => {
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try {
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const { commitmentEvents, newCommitmentEvents } = await getCommitments({ withCache, lastSyncBlock })
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port.postMessage({ result: commitmentEvents })
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saveEvents({ events: newCommitmentEvents, storeName: 'commitment_events_100' })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const getBatchCommitmentsEvents = async ({ blockFrom, blockTo, publicKey, privateKey, cachedEvents, withCache = true }, [port]) => {
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try {
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const commitments = await getCommitmentBatch({ blockFrom, blockTo, publicKey, cachedEvents, withCache })
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port.postMessage({ result: commitments })
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saveEvents({ events: commitments, storeName: 'commitment_events_100' })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const getBatchEvents = async ({ blockFrom, blockTo, publicKey, privateKey, cachedEvents, withCache = true }, [port]) => {
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try {
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const commitments = await getCommitmentBatch({ blockFrom, blockTo, publicKey, cachedEvents, withCache })
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const { decrypted, commitments: userCommitments } = decryptCommitmentEvents({
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publicKey,
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privateKey,
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commitmentEvents: commitments,
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})
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const decryptedHashes = decrypted.map((el) => encryptCrypto(JSON.stringify(el), el.commitment._hex, privateKey))
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port.postMessage({ result: { decrypted, commitments, userCommitments, decryptedHashes } })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const getEventsFromTxHash = async ({ txHash, publicKey, privateKey }, [port]) => {
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try {
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const lastEvents = await getEvents({
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key: txHash.toLowerCase(),
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indexName: 'transactionHash',
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storeName: 'commitment_events_100',
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})
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if (lastEvents && lastEvents.length) {
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const foundEvents = decryptCommitmentEvents({ publicKey, privateKey, commitmentEvents: lastEvents })
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port.postMessage({ result: foundEvents.decrypted })
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return
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}
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const { commitmentEvents } = await getCommitments({ withCache: true })
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const { decrypted } = decryptCommitmentEvents({ publicKey, privateKey, commitmentEvents })
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const foundEvents = decrypted.find((event) => event.transactionHash.toLowerCase() === txHash.toLowerCase())
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port.postMessage({ result: foundEvents })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const getLastSyncBlock = async () => {
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try {
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const [lastEvent] = await getEvents({
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indexName: 'name',
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key: 'commitment_events_100',
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storeName: 'last_sync_event',
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})
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return lastEvent ? lastEvent.blockNumber : numbers.DEPLOYED_BLOCK
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} catch (err) {
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console.error('getLastSyncBlock has error:', err.message)
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return numbers.DEPLOYED_BLOCK
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}
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}
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const getCashedEvents = async ({ storeName, publicKey, privateKey }, [port]) => {
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try {
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const isIdbEnable = await getIsDBEnabled()
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if (!isIdbEnable) {
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const cachedEvents = await self.$indexedDB.getAll({ storeName })
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const decrypted = []
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for (const cachedEvent of cachedEvents) {
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try {
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const event = decryptCrypto(cachedEvent.hash, privateKey)
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if (!decrypted.find((el) => el.index === event.index)) {
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decrypted.push(event)
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}
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} catch {
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continue
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}
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}
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const [lastEvent] = decrypted.sort((a, b) => b.blockNumber - a.blockNumber)
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port.postMessage({ result: { decrypted, lastSyncBlock: lastEvent ? lastEvent.blockNumber : numbers.DEPLOYED_BLOCK } })
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return
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}
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port.postMessage({ result: [] })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const getCashedCommitmentEvents = async ({ storeName, publicKey, privateKey }, [port]) => {
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try {
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const isIdbEnable = await getIsDBEnabled()
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if (!isIdbEnable) {
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const cachedEvents = await self.$indexedDB.getAll({ storeName })
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const commitments = cachedEvents.reduce((acc, curr) => {
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if (!acc.find((el) => el.index === curr.index)) {
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acc.push(curr)
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}
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return acc
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}, [])
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const [lastEvent] = commitments.sort((a, b) => b.blockNumber - a.blockNumber)
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port.postMessage({ result: { commitments, lastSyncBlock: lastEvent ? lastEvent.blockNumber : numbers.DEPLOYED_BLOCK } })
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return
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}
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port.postMessage({ result: [] })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const saveFreshEvents = ({ data, storeName }, [port]) => {
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try {
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saveEvents({ events: data, storeName })
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port.postMessage({ result: 'success' })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const saveLastSyncBlock = async ({ lastSyncBlock }, [port]) => {
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try {
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await self.$indexedDB.putItem({
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data: {
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blockNumber: lastSyncBlock,
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name: 'commitment_events_100',
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},
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storeName: 'last_sync_event',
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})
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port.postMessage({ result: 'success' })
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} catch (err) {
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port.postMessage({ errorMessage: err.message })
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}
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}
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const listener = ({ data, ports }) => {
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self.postMessage(data)
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switch (data.eventName) {
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case workerEvents.GET_COMMITMENT_EVENTS:
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getCommitmentEvents(data.payload, ports)
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break
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// new
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case workerEvents.INIT_WORKER:
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initWorker(data.payload)
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break
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case workerEvents.GET_BATCH_EVENTS:
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getBatchEvents(data.payload, ports)
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break
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case workerEvents.GET_BATCH_COMMITMENTS_EVENTS:
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getBatchCommitmentsEvents(data.payload, ports)
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break
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case workerEvents.GET_EVENTS_FROM_TX_HASH:
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getEventsFromTxHash(data.payload, ports)
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break
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case workerEvents.GET_CACHED_EVENTS:
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getCashedEvents(data.payload, ports)
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break
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case workerEvents.GET_CACHED_COMMITMENTS_EVENTS:
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getCashedCommitmentEvents(data.payload, ports)
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break
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case workerEvents.SAVE_EVENTS:
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saveFreshEvents(data.payload, ports)
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break
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case workerEvents.SAVE_LAST_SYNC_BLOCK:
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saveLastSyncBlock(data.payload, ports)
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break
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}
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}
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// helpers
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const getIsDBEnabled = async () => {
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if (!self.$indexedDB) {
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await sleep(numbers.RECALL_DELAY)
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}
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return !self.$indexedDB || self.$indexedDB.isBlocked
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}
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const getIsWhitelistedDomain = () => {
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const domainWhiteList = ['localhost:3000', 'nova.tornadocash.eth', 'nova.tornadocash.eth.link', 'nova.tornadocash.eth.limo']
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if (self.location.host.includes('compassionate-payne-b9dc6b.netlify.app')) {
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return true
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}
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return domainWhiteList.includes(self.location.host)
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}
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const poseidonHash = (items) => {
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return BigNumber.from(poseidon(items).toString())
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}
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const unpackEncryptedMessage = (encryptedMessage) => {
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if (encryptedMessage.slice(numbers.ZERO, numbers.TWO) === '0x') {
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encryptedMessage = encryptedMessage.slice(numbers.TWO)
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}
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const messageBuff = Buffer.from(encryptedMessage, 'hex')
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const nonceBuf = messageBuff.slice(numbers.ZERO, numbers.NONCE_BUF_LENGTH)
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const ciphertextBuf = messageBuff.slice(numbers.EPHEM_PUBLIC_KEY_BUF_LENGTH)
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const ephemPublicKeyBuf = messageBuff.slice(numbers.NONCE_BUF_LENGTH, numbers.EPHEM_PUBLIC_KEY_BUF_LENGTH)
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return {
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version: 'x25519-xsalsa20-poly1305',
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nonce: nonceBuf.toString('base64'),
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ciphertext: ciphertextBuf.toString('base64'),
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ephemPublicKey: ephemPublicKeyBuf.toString('base64'),
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}
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}
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const keyPairDecrypt = (data, privateKey) => {
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return Buffer.from(decrypt(unpackEncryptedMessage(data), privateKey.slice(numbers.TWO)), 'base64')
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}
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const keypairSign = (privateKey, commitment, merklePath) => {
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return poseidonHash([privateKey, commitment, merklePath])
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}
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const getNullifier = ({ amount, privateKey, publicKey, blinding, index }) => {
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// eslint-disable-next-line eqeqeq
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if (amount.gt(numbers.ZERO) && (index == undefined || privateKey == undefined)) {
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throw new Error('Can not compute nullifier without utxo index or shielded key')
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}
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const commitment = poseidonHash([amount, publicKey, blinding])
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const signature = privateKey ? keypairSign(privateKey, commitment, index || numbers.ZERO) : numbers.ZERO
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const nullifier = poseidonHash([commitment, index || numbers.ZERO, signature])
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return { commitment, nullifier }
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}
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const getHex = (data, from, to) => {
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return data.slice(from, to).toString('hex')
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}
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const encryptCrypto = (string, id, key) => {
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return { hash: AES.encrypt(string, key).toString(), id: HmacSHA256(id, key).toString() }
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}
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const decryptCrypto = (string, key) => {
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const bytes = AES.decrypt(string, key)
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const originalText = bytes.toString(enc.Utf8)
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return JSON.parse(originalText)
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}
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initDataBase()
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self.addEventListener('message', listener, false)
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