added withdraw to ok* family fix ccxt#872

js/okcoinusd.js

@@ -527,6 +527,43 @@ module.exports = class okcoinusd extends Exchange {
         }, params));
     }
 
+    async withdraw (currency, amount, address, params = {}) {
+        await this.loadMarkets ();
+        let lowercase = currency.toLowerCase () + '_usd';
+        // if (amount < 0.01)
+        //     throw new ExchangeError (this.id + ' withdraw() requires amount > 0.01');
+        let request = {
+            'symbol': lowercase,
+            'withdraw_address': address,
+            'withdraw_amount': amount,
+            'target': 'address', // or okcn, okcom, okex
+        };
+        let query = params;
+        if ('chargefee' in query) {
+            request['chargefee'] = query['chargefee'];
+            query = this.omit (query, 'chargefee');
+        } else {
+            throw new ExchangeError (this.id + ' withdraw() requires a `chargefee` parameter');
+        }
+        let password = undefined;
+        if (this.password) {
+            password = this.password;
+        } else if ('password' in query) {
+            request['trade_pwd'] = query['password'];
+            query = this.omit (query, 'password');
+        } else if ('trade_pwd' in query) {
+            request['trade_pwd'] = query['trade_pwd'];
+            query = this.omit (query, 'trade_pwd');
+        }
+        if (!password)
+            throw new ExchangeError (this.id + ' withdraw() requires this.password set on the exchange instance or a password / trade_pwd parameter');
+        let response = await this.privatePostWithdraw (this.extend (request, query));
+        return {
+            'info': response,
+            'id': this.safeString (response, 'withdraw_id'),
+        };
+    }
+
     sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
         let url = '/';
         if (api != 'web')