@leverj/adapter/src/DerivativesOrderAdaptor.js

common utilities used in leverj exchange

const {toChecksumAddress} = require('web3-utils')
const {Quantity} = require('@leverj/gluon-plasma.common.exchange/src/domain/quantity')
const {Order, SignedOrder, Side, OrderType} = require('@leverj/gluon-plasma.app.derivatives.exchange/src/domain/v/0/order')
const {address} = require('@leverj/gluon-plasma.common/src/utils/ethereum')
const mathUtil = require('./MathUtil')
const {affirm} = require('@leverj/affirm')
module.exports = function () {
  const auth = {}
  const SIDES = {buy: "1", sell: "2"}
  const ORDER_TYPES = {LMT: 1, MKT: 2, SLMT: 3, SMKT: 4}
  auth.sign = function (order, instrument, secret) {
    const contractOrder = auth.getContractOrder(order, instrument)
    const signed = contractOrder.signedByWithPersonalMessage(secret)
    return signed.signature
  }
  auth.validate = function (order, instrument, apiKey) {
    const personalMessageSigner = auth.getPersonalMessageSigner(order, instrument)
    if (personalMessageSigner === apiKey) return
    const signer = auth.getSigner(order, instrument)
    affirm(signer === apiKey, 'M_INV_ORDSIG', 422)
  }
  auth.getSigner = function (order, instrument) {
    return getSignedOrder(order, auth, instrument).signer
  }
  auth.getPersonalMessageSigner = function (order, instrument) {
    return getSignedOrder(order, auth, instrument).personalMessageSigner
  }
  auth.getContractOrder = function (order, instrument) {
    affirm(ORDER_TYPES[order.orderType] > 0, 'Invalid order orderType')
    affirm(SIDES[order.side] > 0, 'Invalid order side')
    affirm(instrument, 'instrument missing')
    affirm(instrument.id === order.instrument, 'instrument must be same as order instrument')
    affirm(!isNaN(order.timestamp), 'Invalid timestamp')
    const id = order.uuid
    const timestamp = order.timestamp
    const orderType = OrderType[order.orderType]
    const side = Side[order.side]
    const quantity = Quantity.from(order.quantity)
    const price = mathUtil.toBN(order.price, instrument.quote.decimals).toFixed()
    const marginPerFraction = order.marginPerFraction
    const quote = order.quote
    const account = toChecksumAddress(order.accountId)
    const originator = toChecksumAddress(order.originator)
    return new Order(id, timestamp, orderType, side, instrument.id, quantity, price, marginPerFraction, quote, originator, account)
  }
  auth.toBN = mathUtil.toBN

  function getSignedOrder(order, auth, instrument) {
    const serverTimestamp = order.entryTime ? order.entryTime : 0
    const contractOrder = auth.getContractOrder(order, instrument)
    return new SignedOrder(contractOrder, order.signature, serverTimestamp, 0)
  }

  return auth
}()