Implement v2 API for stateful sessions and add engagement metrics support

api.js

@@ -1,4 +1,5 @@
 const express = require('express');
+const cors = require('cors');
 const fs = require('fs');
 const path = require('path');
 const crypto = require('crypto');
@@ -18,6 +19,14 @@ if (!fs.existsSync(CACHE_DIR)) {
 app.use(express.json({ limit: '1gb' }));
 app.use(express.urlencoded({ limit: '1gb', extended: true }));
 
+// enable CORS for all routes
+app.use(cors({
+    origin: '*',
+    methods: ['GET', 'POST', 'PATCH', 'DELETE', 'OPTIONS'],
+    allowedHeaders: ['Content-Type', 'Authorization'],
+    credentials: false
+}));
+
 // Request logging middleware
 app.use((req, res, next) => {
     // skip logging health checks