CoinZark Swap Plugin

src/index.js

@@ -9,6 +9,7 @@ import { makeNomicsPlugin } from './rate/nomics.js'
 import { makeShapeshiftRatePlugin } from './rate/shapeshift-rate.js'
 import { makeChangellyPlugin } from './swap/changelly.js'
 import { makeChangeNowPlugin } from './swap/changenow.js'
+import { makeCoinZarkPlugin } from './swap/coinzark.js'
 import { makeFaastPlugin } from './swap/faast.js'
 import { makeShapeshiftPlugin } from './swap/shapeshift.js'
 
@@ -26,6 +27,7 @@ const edgeCorePlugins = {
   changelly: makeChangellyPlugin,
   changenow: makeChangeNowPlugin,
   faast: makeFaastPlugin,
+  coinzark: makeCoinZarkPlugin,
   shapeshift: makeShapeshiftPlugin
 }
 

src/swap/coinzark.js

@@ -0,0 +1,272 @@
+// @flow
+
+import {
+  type EdgeCorePluginOptions,
+  type EdgeCurrencyWallet,
+  type EdgeSwapPlugin,
+  type EdgeSwapPluginQuote,
+  type EdgeSwapRequest,
+  SwapAboveLimitError,
+  SwapBelowLimitError,
+  SwapCurrencyError
+} from 'edge-core-js/types'
+
+import { getFetchJson } from '../react-native-io.js'
+import { makeSwapPluginQuote } from '../swap-helpers.js'
+
+const swapInfo = {
+  pluginName: 'coinzark',
+  displayName: 'CoinZark',
+  supportEmail: '[email protected]'
+}
+
+const expirationMs = 84600 * 60 * 60 * 1000
+
+const uri = 'https://www.coinzark.com/api/v2/'
+
+const dontUseLegacy = {
+  DGB: true
+}
+
+async function getAddress (
+  wallet: EdgeCurrencyWallet,
+  currencyCode: string
+): Promise<string> {
+  const addressInfo = await wallet.getReceiveAddress({ currencyCode })
+  return addressInfo.legacyAddress && !dontUseLegacy[currencyCode]
+    ? addressInfo.legacyAddress
+    : addressInfo.publicAddress
+}
+
+export function makeCoinZarkPlugin (
+  opts: EdgeCorePluginOptions
+): EdgeSwapPlugin {
+  const { io, initOptions } = opts
+  const fetchJson = getFetchJson(opts)
+
+  const out: EdgeSwapPlugin = {
+    swapInfo,
+    async fetchSwapQuote (
+      request: EdgeSwapRequest,
+      userSettings: Object | void
+    ): Promise<EdgeSwapPluginQuote> {
+      const {
+        fromCurrencyCode,
+        fromWallet,
+        nativeAmount,
+        quoteFor,
+        toCurrencyCode,
+        toWallet
+      } = request
+      if (toCurrencyCode === fromCurrencyCode) {
+        throw new SwapCurrencyError(swapInfo, fromCurrencyCode, toCurrencyCode)
+      }
+
+      if (quoteFor !== 'from') {
+        // CoinZark does not support reverse quotes
+        throw new SwapCurrencyError(swapInfo, fromCurrencyCode, toCurrencyCode)
+      }
+
+      // Grab addresses:
+      const [fromAddress, toAddress] = await Promise.all([
+        getAddress(fromWallet, fromCurrencyCode),
+        getAddress(toWallet, toCurrencyCode)
+      ])
+
+      // Convert amount to CoinZark supported format
+      const quoteAmount = await fromWallet.nativeToDenomination(
+        nativeAmount,
+        fromCurrencyCode
+      )
+
+      // Convenience function to get JSON from the API
+      async function get (path: string) {
+        const api = `${uri}${path}`
+        const reply = await fetchJson(api)
+        return reply.json
+      }
+
+      // Convenience function to post form values and get returned JSON from the API
+      async function post (url, values: any) {
+        const opts = {
+          headers: {
+            'Content-Type': 'application/x-www-form-urlencoded',
+            Accept: 'application/json'
+          },
+          method: 'POST',
+          body: ''
+        }
+        const formData = new URLSearchParams()
+        for (const prop in values) {
+          if (!values.hasOwnProperty(prop)) continue
+          formData.append(prop, values[prop])
+        }
+        opts.body = formData.toString()
+        const reply = await fetchJson(`${uri}${url}`, opts)
+        const out = reply.json
+        return out
+      }
+
+      // Fetch the supported currencies
+      const currencies = await get('swap/currencies')
+      let fromCorrect = false
+      let toCorrect = false
+
+      // Loop through the currencies and find the requested ones.
+      // CoinZark will return canDeposit / canReceive as status of the
+      // coins. The coin we want to exchange from should have canDeposit enabled
+      // and the coin we want to exchange to should have canReceive enabled.
+      if (currencies != null && currencies.result != null) {
+        for (const curr of currencies.result) {
+          if (curr.id === fromCurrencyCode && curr.canDeposit === 1) {
+            fromCorrect = true
+          }
+
+          if (curr.id === toCurrencyCode && curr.canReceive === 1) {
+            toCorrect = true
+          }
+        }
+      }
+
+      // Check if we managed to match the requested coin types
+      // and that they are properly available. If not return an error.
+      if (!fromCorrect || !toCorrect) {
+        throw new SwapCurrencyError(swapInfo, fromCurrencyCode, toCurrencyCode)
+      }
+
+      // Fetch the rate from CoinZark. This also includes the limits.
+      const swapRate = await get(
+        'swap/rate?from=' +
+          fromCurrencyCode +
+          '&to=' +
+          toCurrencyCode +
+          '&amount=' +
+          quoteAmount +
+          '&affiliateID=' +
+          initOptions.affiliateId +
+          '&affiliateFee=' +
+          initOptions.affiliateFee.toString()
+      )
+
+      const nativeMin = await request.fromWallet.denominationToNative(
+        swapRate.result.minimumDeposit,
+        fromCurrencyCode
+      )
+
+      const nativeMax = await request.fromWallet.denominationToNative(
+        swapRate.result.maximumDeposit,
+        fromCurrencyCode
+      )
+
+      // If the final amount is 0, there is something wrong. Probably the limits.
+      if (swapRate.result.finalAmount === 0) {
+        if (
+          parseFloat(swapRate.result.depositAmount) <
+          parseFloat(swapRate.result.minimumDeposit)
+        ) {
+          throw new SwapBelowLimitError(swapInfo, nativeMin)
+        }
+
+        if (
+          parseFloat(swapRate.result.depositAmount) >
+          parseFloat(swapRate.result.maximumDeposit)
+        ) {
+          throw new SwapAboveLimitError(swapInfo, nativeMax)
+        }
+
+        throw new SwapCurrencyError(swapInfo, fromCurrencyCode, toCurrencyCode)
+      }
+
+      // Convert the receive amount to native
+      const receiveAmount = await fromWallet.denominationToNative(
+        swapRate.result.finalAmount,
+        fromCurrencyCode
+      )
+
+      // Configure the form parameters for the Swap create call
+      const swapParams = {
+        destination: toAddress,
+        refund: fromAddress,
+        from: fromCurrencyCode,
+        to: toCurrencyCode,
+        amount: quoteAmount,
+        affiliateID: initOptions.affiliateId,
+        affiliateFee: initOptions.affiliateFee.toString()
+      }
+
+      // Create the swap
+      const swap = await post('swap/create', swapParams)
+
+      // Check if the creation was succesful, otherwise return an error
+      if (!swap.success) {
+        throw new SwapCurrencyError(swapInfo, fromCurrencyCode, toCurrencyCode)
+      }
+
+      let swapStatus = {
+        result: {
+          deposit_addr_default: ''
+        }
+      }
+
+      // Poll the status until there's an error or the swap is
+      // awaiting the deposit
+      while (true) {
+        swapStatus = await get('swap/status?uuid=' + swap.result.uuid)
+
+        if (
+          !swapStatus.success ||
+          swapStatus.result.swap_status === 'cancelled'
+        ) {
+          throw new SwapCurrencyError(
+            swapInfo,
+            fromCurrencyCode,
+            toCurrencyCode
+          )
+        }
+
+        if (swapStatus.result.swap_status === 'awaitingDeposit') {
+          break
+        }
+
+        // Wait for one second
+        await new Promise(resolve => setTimeout(resolve, 1000))
+      }
+
+      const spendInfo = {
+        currencyCode: request.fromCurrencyCode,
+        spendTargets: [
+          {
+            nativeAmount: request.nativeAmount,
+            publicAddress: swapStatus.result.deposit_addr_default,
+            otherParams: {
+              uniqueIdentifier: swap.result.uuid
+            }
+          }
+        ]
+      }
+
+      io.console.info('CoinZark spendinfo:', spendInfo)
+
+      // Build the transaction the user has to approve to
+      // initiate the swap
+      const tx = await request.fromWallet.makeSpend(spendInfo)
+      tx.otherParams.payinAddress = spendInfo.spendTargets[0].publicAddress
+      tx.otherParams.uniqueIdentifier =
+        spendInfo.spendTargets[0].otherParams.uniqueIdentifier
+
+      // Return the quote to the user for execution
+      return makeSwapPluginQuote(
+        request,
+        request.nativeAmount,
+        receiveAmount,
+        tx,
+        toAddress,
+        'coinzark',
+        new Date(Date.now() + expirationMs),
+        swap.result.uuid
+      )
+    }
+  }
+
+  return out
+}