(refactor) OCOCO: check action and ocoAction validity

lib/ococo/meta/validate_params.js

@@ -7,7 +7,7 @@ const ORDER_TYPES = ['MARKET', 'LIMIT']
 module.exports = (args = {}) => {
   const {
     orderPrice, amount, orderType, submitDelay, cancelDelay, limitPrice,
-    stopPrice, ocoAmount, lev, _futures
+    stopPrice, ocoAmount, lev, _futures, action, ocoAction
   } = args
 
   if (ORDER_TYPES.indexOf(orderType) === -1) return `Invalid order type: ${orderType}`
@@ -22,6 +22,9 @@ module.exports = (args = {}) => {
   if (!_isFinite(stopPrice)) return 'Invalid OCO stop price'
   if (!_isFinite(ocoAmount)) return 'Invalid OCO amount'
 
+  if (action !== 'Buy' && action !== 'Sell') return `Invalid action: ${action}`
+  if (ocoAction !== 'Buy' && ocoAction !== 'Sell') return `Invalid OCO action: ${ocoAction}`
+
   if (_futures) {
     if (!_isFinite(lev)) return 'Invalid leverage'
     if (lev < 1) return 'Leverage less than 1'