index.js

import express from "express";
import mongoose from "mongoose";
import cors from "cors";
import passport from "passport";
import session from "express-session";
import dotenv from "dotenv";
import "./auth/passport.js"; 
import { checkAuthenticated } from "./middleware/authMiddleware.js";
import authRoute from "./routes/authRoute.js";
import apiRoute from "./routes/apiRoute.js";
import connectDB from "./utils/db.js";
import helmet from "helmet";
import swaggerUi from "swagger-ui-express";
import swaggerSpec from "./swagger.js";
import { connectRedis } from "./utils/redis.js";
import serverless from "serverless-http";
import MongoStore from "connect-mongo";

dotenv.config();

const app = express();

const isProduction = process.env.NODE_ENV === 'production';


app.use(
  session({
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: false, 
    store: MongoStore.create({
      mongoUrl: process.env.MONGO_URI,
      collectionName: 'sessions', 
      ttl: 7 * 24 * 60 * 60, 
      autoRemove: 'native',
      touchAfter: 24 * 3600 // Only update sessions once per 24 hours unless data changes
    }),
    cookie: { 
      maxAge: 7 * 24 * 60 * 60 * 1000,
      secure: isProduction,
      httpOnly: true,
      sameSite: isProduction ? 'none' : 'lax'  
    },
    proxy: isProduction,
    name: 'sessionId'
  })
);

app.use(cors());
app.use(express.json());
// Sending HTTP Headers Securely
app.use(helmet()); 
app.use(passport.initialize());
app.use(passport.session());

// API Routes
app.use("/auth", authRoute);
app.use("/api", apiRoute);
app.get("/home", checkAuthenticated, (req, res) => {
  res.send(`<h1>Welcome to URL Shortener, ${req?.user?.name}!</h1> \n</p>`);
});
app.use("/api-docs", swaggerUi.serve, swaggerUi.setup(swaggerSpec));

// DB Connection
connectDB();

//Redis Connection
connectRedis();



const port = process.env.PORT || 3000;
// For local development
if (process.env.NODE_ENV !== 'production') {
  const port = process.env.PORT || 3000;
  app.listen(port, () => console.log(`Server running on port: ${port}\nAPI Docs available at: http://localhost:3000/api-docs`));
}

export default app;

export const handler = serverless(app);