57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
const ccxt = require('ccxt')
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const BN = require('../../../bn')
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const axios = require('axios')
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const _ = require('lodash/fp')
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const common = require('../../common/cctx')
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function ticker (exchangeName, fiatCode, cryptoCode) {
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const exchange = new ccxt[exchangeName]()
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if (fiatCode === 'EUR' || fiatCode === 'USD' || exchange.id === 'coinbase') {
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return getCurrencyRates(exchange, fiatCode, cryptoCode)
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}
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return axios.get('https://bitpay.com/rates')
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.then(response => {
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try {
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const fxRates = response.data.data
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const usdRate = findCurrencyRates(fxRates, 'USD')
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const fxRate = findCurrencyRates(fxRates, fiatCode).div(usdRate)
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return getCurrencyRates(exchange, 'USD', cryptoCode)
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.then(res => ({
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rates: {
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ask: res.rates.ask.times(fxRate),
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bid: res.rates.bid.times(fxRate)
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}
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}))
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} catch (e) {
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return Promise.reject(e)
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}
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})
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}
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function getCurrencyRates (exchange, fiatCode, cryptoCode) {
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try {
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if (exchange.has['fetchTicker']) {
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const symbol = common.verifyCurrencies(exchange.id, fiatCode, cryptoCode)
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return exchange.fetchTicker(symbol)
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.then(res => ({
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rates: {
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ask: BN(res.ask),
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bid: BN(res.bid)
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}
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}))
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}
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} catch (e) {
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return Promise.reject(e)
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}
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}
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function findCurrencyRates (fxRates, fiatCode) {
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const rates = _.find(_.matchesProperty('code', fiatCode), fxRates)
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if (!rates || !rates.rate) throw new Error(`Unsupported currency: ${fiatCode}`)
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return BN(rates.rate.toString())
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}
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module.exports = { ticker }
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