Implement redux.

lib/auth.js

@@ -1,8 +1,9 @@
 import { parse } from 'cookie';
 import { verifySecureToken } from './crypto';
+import { AUTH_COOKIE_NAME } from './constants';
 
-export default async req => {
-  const token = parse(req.headers.cookie || '')['umami.auth'];
+export async function verifyAuthToken(req) {
+  const token = parse(req.headers.cookie || '')[AUTH_COOKIE_NAME];
 
   return verifySecureToken(token);
-};
+}