refactor building formData params

templates/app/react-native/src/api/AccountAPI.js

@@ -2,6 +2,7 @@ import api from './API';
 import { getEnvVars } from '../../Environment';
 
 const { oAuthConfig } = getEnvVars();
+
 getLoginData = (username, password) => {
 
   const formData = {
@@ -15,9 +16,9 @@ getLoginData = (username, password) => {
   if (oAuthConfig.clientSecret)
     formData['client_secret'] = oAuthConfig.clientSecret;
 
-  return Array.from(Object.entries(formData))
-              .reduce((prev, [key, value]) => prev+=`&${key}=${value}`, '')
-              .slice(1);
+  return Object.entries(formData)
+    .map(([key, value]) => `${key}=${encodeURIComponent(value)}`)
+    .join('&');
 }
 
 export const login = ({ username, password }) =>
@@ -26,9 +27,10 @@ export const login = ({ username, password }) =>
     url: '/connect/token',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
     data: getLoginData(username, password),
-    baseURL: oAuthConfig.issuer,
+    baseURL: oAuthConfig.issuer
   }).then(({ data }) => data);
 
+
 export const Logout = () =>
   api({
     method: 'GET',