Pops refresh dialog at 5 min before expiration

Author: c-simpson

src/client/src/App.js

@@ -17,6 +17,7 @@ import Refresh from './components/Refresh';
 import useToken from './components/Login/useToken';
 var jwt = require('jsonwebtoken');
 
+const REFRESH_POPUP_TIME = 300 // seconds
 
 // Triggers token expiration check
 const sleep = time => new Promise(resolve => setTimeout(resolve, time))
@@ -80,7 +81,7 @@ function AuthenticatedApp() {
     var expTime =  decoded?.payload.exp -  Date.now()/1000;
     const jwtExpired = expTime <= 0
 
-    const popRefreshAlert = expTime > 0 && expTime < 30;  // Time in secs to pop up refresh dialog
+    const popRefreshAlert = expTime > 0 && expTime < REFRESH_POPUP_TIME;  // Time in secs to pop up refresh dialog
 
     const hdr = userRole === 'admin' ?  <AdminHeader /> : <Header /> // If we're going to display a header, which one?