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427 lines
13 KiB
427 lines
13 KiB
import log from 'loglevel'
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import BigNumber from 'bignumber.js'
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import abi from 'human-standard-token-abi'
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import { isValidAddress } from 'ethereumjs-util'
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import { ETH_SWAPS_TOKEN_OBJECT } from '../../helpers/constants/swaps'
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import { calcTokenValue, calcTokenAmount } from '../../helpers/utils/token-util'
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import { constructTxParams, toPrecisionWithoutTrailingZeros } from '../../helpers/utils/util'
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import { decimalToHex, getValueFromWeiHex } from '../../helpers/utils/conversions.util'
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import { subtractCurrencies } from '../../helpers/utils/conversion-util'
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import { formatCurrency } from '../../helpers/utils/confirm-tx.util'
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import fetchWithCache from '../../helpers/utils/fetch-with-cache'
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import { calcGasTotal } from '../send/send.utils'
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const TOKEN_TRANSFER_LOG_TOPIC_HASH = '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'
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const CACHE_REFRESH_ONE_HOUR = 3600000
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const getBaseApi = function (type) {
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switch (type) {
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case 'trade':
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return `https://api.metaswap.codefi.network/trades?`
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case 'tokens':
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return `https://api.metaswap.codefi.network/tokens`
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case 'topAssets':
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return `https://api.metaswap.codefi.network/topAssets`
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case 'featureFlag':
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return `https://api.metaswap.codefi.network/featureFlag`
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case 'aggregatorMetadata':
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return `https://api.metaswap.codefi.network/aggregatorMetadata`
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default:
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throw new Error('getBaseApi requires an api call type')
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}
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}
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const validHex = (string) => Boolean(string?.match(/^0x[a-f0-9]+$/u))
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const truthyString = (string) => Boolean(string?.length)
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const truthyDigitString = (string) => truthyString(string) && Boolean(string.match(/^\d+$/u))
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const QUOTE_VALIDATORS = [
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{
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property: 'trade',
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type: 'object',
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validator: (trade) => trade && validHex(trade.data) && isValidAddress(trade.to) && isValidAddress(trade.from) && truthyString(trade.value),
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},
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{
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property: 'approvalNeeded',
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type: 'object',
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validator: (approvalTx) => (
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approvalTx === null ||
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(
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approvalTx &&
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validHex(approvalTx.data) &&
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isValidAddress(approvalTx.to) &&
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isValidAddress(approvalTx.from)
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)
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),
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},
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{
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property: 'sourceAmount',
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type: 'string',
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validator: truthyDigitString,
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},
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{
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property: 'destinationAmount',
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type: 'string',
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validator: truthyDigitString,
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},
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{
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property: 'sourceToken',
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type: 'string',
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validator: isValidAddress,
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},
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{
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property: 'destinationToken',
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type: 'string',
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validator: isValidAddress,
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},
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{
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property: 'aggregator',
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type: 'string',
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validator: truthyString,
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},
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{
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property: 'aggType',
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type: 'string',
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validator: truthyString,
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},
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{
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property: 'error',
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type: 'object',
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validator: (error) => error === null || typeof error === 'object',
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},
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{
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property: 'averageGas',
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type: 'number',
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},
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{
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property: 'maxGas',
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type: 'number',
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},
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]
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const TOKEN_VALIDATORS = [
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{
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property: 'address',
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type: 'string',
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validator: isValidAddress,
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},
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{
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property: 'symbol',
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type: 'string',
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validator: (string) => truthyString(string) && string.length <= 12,
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},
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{
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property: 'decimals',
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type: 'string|number',
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validator: (string) => Number(string) >= 0 && Number(string) <= 36,
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},
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]
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const TOP_ASSET_VALIDATORS = TOKEN_VALIDATORS.slice(0, 2)
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const AGGREGATOR_METADATA_VALIDATORS = [
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{
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property: 'color',
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type: 'string',
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validator: (string) => Boolean(string.match(/^#[A-Fa-f0-9]+$/u)),
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},
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{
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property: 'title',
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type: 'string',
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validator: truthyString,
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},
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{
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property: 'icon',
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type: 'string',
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validator: (string) => Boolean(string.match(/^data:image/u)),
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},
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]
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function validateData (validators, object, urlUsed) {
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return validators.every(({ property, type, validator }) => {
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const types = type.split('|')
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const valid = types.some((_type) => typeof object[property] === _type) && (!validator || validator(object[property]))
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if (!valid) {
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log.error(`response to GET ${urlUsed} invalid for property ${property}; value was:`, object[property], '| type was: ', typeof object[property])
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}
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return valid
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})
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}
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export async function fetchTradesInfo ({
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slippage,
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sourceToken,
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sourceDecimals,
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destinationToken,
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value,
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fromAddress,
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exchangeList,
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}) {
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const urlParams = {
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destinationToken,
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sourceToken,
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sourceAmount: calcTokenValue(value, sourceDecimals).toString(10),
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slippage,
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timeout: 10000,
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walletAddress: fromAddress,
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}
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if (exchangeList) {
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urlParams.exchangeList = exchangeList
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}
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const queryString = new URLSearchParams(urlParams).toString()
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const tradeURL = `${getBaseApi('trade')}${queryString}`
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const tradesResponse = await fetchWithCache(tradeURL, { method: 'GET' }, { cacheRefreshTime: 0, timeout: 15000 })
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const newQuotes = tradesResponse.reduce((aggIdTradeMap, quote) => {
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if (quote.trade && !quote.error && validateData(QUOTE_VALIDATORS, quote, tradeURL)) {
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const constructedTrade = constructTxParams({
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to: quote.trade.to,
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from: quote.trade.from,
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data: quote.trade.data,
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amount: decimalToHex(quote.trade.value),
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gas: decimalToHex(quote.maxGas),
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})
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let { approvalNeeded } = quote
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if (approvalNeeded) {
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approvalNeeded = constructTxParams({
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...approvalNeeded,
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})
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}
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return {
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...aggIdTradeMap,
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[quote.aggregator]: {
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...quote,
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slippage,
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trade: constructedTrade,
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approvalNeeded,
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},
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}
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}
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return aggIdTradeMap
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}, {})
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return newQuotes
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}
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export async function fetchTokens () {
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const tokenUrl = getBaseApi('tokens')
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const tokens = await fetchWithCache(tokenUrl, { method: 'GET' }, { cacheRefreshTime: CACHE_REFRESH_ONE_HOUR })
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const filteredTokens = tokens.filter((token) => {
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return validateData(TOKEN_VALIDATORS, token, tokenUrl) && (token.address !== ETH_SWAPS_TOKEN_OBJECT.address)
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})
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filteredTokens.push(ETH_SWAPS_TOKEN_OBJECT)
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return filteredTokens
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}
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export async function fetchAggregatorMetadata () {
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const aggregatorMetadataUrl = getBaseApi('aggregatorMetadata')
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const aggregators = await fetchWithCache(aggregatorMetadataUrl, { method: 'GET' }, { cacheRefreshTime: CACHE_REFRESH_ONE_HOUR })
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const filteredAggregators = {}
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for (const aggKey in aggregators) {
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if (validateData(AGGREGATOR_METADATA_VALIDATORS, aggregators[aggKey], aggregatorMetadataUrl)) {
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filteredAggregators[aggKey] = aggregators[aggKey]
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}
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}
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return filteredAggregators
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}
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export async function fetchTopAssets () {
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const topAssetsUrl = getBaseApi('topAssets')
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const response = await fetchWithCache(topAssetsUrl, { method: 'GET' }, { cacheRefreshTime: CACHE_REFRESH_ONE_HOUR })
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const topAssetsMap = response.reduce((_topAssetsMap, asset, index) => {
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if (validateData(TOP_ASSET_VALIDATORS, asset, topAssetsUrl)) {
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return { ..._topAssetsMap, [asset.address]: { index: String(index) } }
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}
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return _topAssetsMap
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}, {})
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return topAssetsMap
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}
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export async function fetchSwapsFeatureLiveness () {
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const status = await fetchWithCache(getBaseApi('featureFlag'), { method: 'GET' }, { cacheRefreshTime: 600000 })
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return status?.active
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}
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export async function fetchTokenPrice (address) {
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const query = `contract_addresses=${address}&vs_currencies=eth`
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const prices = await fetchWithCache(`https://api.coingecko.com/api/v3/simple/token_price/ethereum?${query}`, { method: 'GET' }, { cacheRefreshTime: 60000 })
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return prices && prices[address]?.eth
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}
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export async function fetchTokenBalance (address, userAddress) {
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const tokenContract = global.eth.contract(abi).at(address)
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const tokenBalancePromise = tokenContract
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? tokenContract.balanceOf(userAddress)
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: Promise.resolve()
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const usersToken = await tokenBalancePromise
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return usersToken
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}
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export function getRenderableGasFeesForQuote (tradeGas, approveGas, gasPrice, currentCurrency, conversionRate) {
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const totalGasLimitForCalculation = (new BigNumber(tradeGas || '0x0', 16)).plus(approveGas || '0x0', 16).toString(16)
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const gasTotalInWeiHex = calcGasTotal(totalGasLimitForCalculation, gasPrice)
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const ethFee = getValueFromWeiHex({
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value: gasTotalInWeiHex,
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toDenomination: 'ETH',
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numberOfDecimals: 5,
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})
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const rawNetworkFees = getValueFromWeiHex({
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value: gasTotalInWeiHex,
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toCurrency: currentCurrency,
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conversionRate,
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numberOfDecimals: 2,
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})
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const formattedNetworkFee = formatCurrency(rawNetworkFees, currentCurrency)
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return {
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rawNetworkFees,
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rawEthFee: ethFee,
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feeInFiat: formattedNetworkFee,
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feeInEth: `${ethFee} ETH`,
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}
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}
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export function quotesToRenderableData (quotes, gasPrice, conversionRate, currentCurrency, approveGas, tokenConversionRates) {
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return Object.values(quotes).map((quote) => {
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const {
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destinationAmount = 0,
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sourceAmount = 0,
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sourceTokenInfo,
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destinationTokenInfo,
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slippage,
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aggType,
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aggregator,
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gasEstimateWithRefund,
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averageGas,
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fee,
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} = quote
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const sourceValue = calcTokenAmount(sourceAmount, sourceTokenInfo.decimals || 18).toString(10)
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const destinationValue = calcTokenAmount(destinationAmount, destinationTokenInfo.decimals || 18).toPrecision(8)
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const {
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feeInFiat,
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rawNetworkFees,
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rawEthFee,
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feeInEth,
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} = getRenderableGasFeesForQuote(
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(
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gasEstimateWithRefund ||
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decimalToHex(averageGas || 800000)
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),
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approveGas,
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gasPrice,
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currentCurrency,
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conversionRate,
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)
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const slippageMultiplier = (new BigNumber(100 - slippage)).div(100)
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const minimumAmountReceived = (new BigNumber(destinationValue)).times(slippageMultiplier).toFixed(6)
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const tokenConversionRate = tokenConversionRates[destinationTokenInfo.address]
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const ethValueOfTrade = destinationTokenInfo.symbol === 'ETH'
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? calcTokenAmount(destinationAmount, destinationTokenInfo.decimals || 18).minus(rawEthFee, 10)
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: (new BigNumber(tokenConversionRate || 0, 10))
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.times(calcTokenAmount(destinationAmount, destinationTokenInfo.decimals || 18), 10)
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.minus(rawEthFee, 10)
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let liquiditySourceKey
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let renderedSlippage = slippage
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if (aggType === 'AGG') {
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liquiditySourceKey = 'swapAggregator'
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} else if (aggType === 'RFQ') {
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liquiditySourceKey = 'swapRequestForQuotation'
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renderedSlippage = 0
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} else if (aggType === 'DEX') {
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liquiditySourceKey = 'swapDecentralizedExchange'
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} else {
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liquiditySourceKey = 'swapUnknown'
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}
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return {
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aggId: aggregator,
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amountReceiving: `${destinationValue} ${destinationTokenInfo.symbol}`,
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destinationTokenDecimals: destinationTokenInfo.decimals,
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destinationTokenSymbol: destinationTokenInfo.symbol,
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destinationTokenValue: formatSwapsValueForDisplay(destinationValue),
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isBestQuote: quote.isBestQuote,
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liquiditySourceKey,
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feeInEth,
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detailedNetworkFees: `${feeInEth} (${feeInFiat})`,
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networkFees: feeInFiat,
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quoteSource: aggType,
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rawNetworkFees,
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slippage: renderedSlippage,
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sourceTokenDecimals: sourceTokenInfo.decimals,
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sourceTokenSymbol: sourceTokenInfo.symbol,
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sourceTokenValue: sourceValue,
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ethValueOfTrade,
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minimumAmountReceived,
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metaMaskFee: fee,
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}
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})
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}
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export function getSwapsTokensReceivedFromTxMeta (tokenSymbol, txMeta, tokenAddress, accountAddress, tokenDecimals, approvalTxMeta) {
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const txReceipt = txMeta?.txReceipt
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if (tokenSymbol === 'ETH') {
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if (!txReceipt || !txMeta || !txMeta.postTxBalance || !txMeta.preTxBalance) {
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return null
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}
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let approvalTxGasCost = '0x0'
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if (approvalTxMeta && approvalTxMeta.txReceipt) {
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approvalTxGasCost = calcGasTotal(approvalTxMeta.txReceipt.gasUsed, approvalTxMeta.txParams.gasPrice)
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}
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const gasCost = calcGasTotal(txReceipt.gasUsed, txMeta.txParams.gasPrice)
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const totalGasCost = (new BigNumber(gasCost, 16)).plus(approvalTxGasCost, 16).toString(16)
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const preTxBalanceLessGasCost = subtractCurrencies(txMeta.preTxBalance, totalGasCost, {
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aBase: 16,
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bBase: 16,
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toNumericBase: 'hex',
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})
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const ethReceived = subtractCurrencies(txMeta.postTxBalance, preTxBalanceLessGasCost, {
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aBase: 16,
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bBase: 16,
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fromDenomination: 'WEI',
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toDenomination: 'ETH',
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toNumericBase: 'dec',
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numberOfDecimals: 6,
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})
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return ethReceived
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}
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const txReceiptLogs = txReceipt?.logs
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if (txReceiptLogs && txReceipt?.status !== '0x0') {
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const tokenTransferLog = txReceiptLogs.find((txReceiptLog) => {
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const isTokenTransfer = txReceiptLog.topics && txReceiptLog.topics[0] === TOKEN_TRANSFER_LOG_TOPIC_HASH
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const isTransferFromGivenToken = txReceiptLog.address === tokenAddress
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const isTransferFromGivenAddress = txReceiptLog.topics && txReceiptLog.topics[2] && txReceiptLog.topics[2].match(accountAddress.slice(2))
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return isTokenTransfer && isTransferFromGivenToken && isTransferFromGivenAddress
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})
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return tokenTransferLog
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? toPrecisionWithoutTrailingZeros(
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calcTokenAmount(tokenTransferLog.data, tokenDecimals).toString(10), 6,
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)
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: ''
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}
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return null
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}
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export function formatSwapsValueForDisplay (destinationAmount) {
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let amountToDisplay = toPrecisionWithoutTrailingZeros(destinationAmount, 12)
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if (amountToDisplay.match(/e[+-]/u)) {
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amountToDisplay = (new BigNumber(amountToDisplay)).toFixed()
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}
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return amountToDisplay
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}
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