kraken plugin WIP

lib/plugins/kraken.js

@@ -0,0 +1,51 @@
+require('es6-promise').polyfill()
+var axios = require('axios')
+var _ = require('lodash')
+var BigNumber = require('bignumber.js')
+BigNumber.config({DECIMAL_PLACES: 30})
+
+exports.NAME = 'Kraken'
+exports.SUPPORTED_MODULES = ['ticker']
+
+// var pluginConfig = {}
+
+// https://bitpay.com/api/rates
+
+exports.config = function config (localConfig) {
+//  pluginConfig = localConfig
+}
+
+function findCurrency (fxRates, currency) {
+  return new BigNumber(_.find(fxRates, function (r) { return r.code === currency }).rate)
+}
+
+exports.ticker = function ticker (currencies, cryptoCoin, callback) {
+  return axios.get('https://bitpay.com/api/rates')
+  .then(function (response) {
+    var fxRates = response.data
+
+    return axios.get('https://api.kraken.com/0/public/Ticker?pair=ETHUSD')
+    .then(function (response2) {
+      var usdRate = findCurrency(fxRates, 'USD')
+      var rates = response2.data.result.XETHZUSD
+      var res = {}
+      var cryptoCoinFactor = new BigNumber(10).pow(cryptoCoin.unitScale)
+
+      currencies.forEach(function (currency) {
+        var fxRate = findCurrency(fxRates, currency).div(usdRate)
+        res[currency] = {
+          ask: fxRate.times(rates.a[0]).div(cryptoCoinFactor),
+          bid: fxRate.times(rates.b[0]).div(cryptoCoinFactor)
+        }
+      })
+
+      callback(null, res)
+    })
+  })
+  .catch(callback)
+}
+
+exports.ticker(['USD', 'ILS', 'EUR'], {unitScale: 18}, function (err, res) {
+  if (err) return console.log(err.stack)
+  console.log(JSON.stringify(res, null, 2))
+})