refactor: redirect logged-in to chat & clear state

src/server/routes/user.js

@@ -11,9 +11,16 @@ export default function userRoutes(app) {
   app.get('/auth/reddit/callback', (req, res, next) => {
     if (req.query.state === req.session.state) {
       passport.authenticate('reddit', {
-        successRedirect: '/',
+        successRedirect: '/chat',
         failureRedirect: '/login',
-      })(req, res, next);
+      })(req, res, (error) => {
+        if (error) {
+          next(error);
+          return;
+        }
+        delete req.session.state;
+        req.session.save(next);
+      });
     }
     else {
       res.status(403).end('Forbidden: state mismatch');