authMiddleware.js

const jwt = require("jsonwebtoken");
const APP_SECRET = "myappsecret";
const USERNAME = "admin";
const PASSWORD = "secret";
module.exports = function (req, res, next) {
  if ((req.url == "/api/login" || req.url == "/login") && req.method == "POST") {
    if (req.body != null && req.body.name == USERNAME && req.body.password == PASSWORD) {
      let token = jwt.sign({
        data: USERNAME,
        expiresIn: "1h"
      }, APP_SECRET);
      res.json({
        success: true,
        token: token
      });
    } else {
      res.json({
        success: false
      });
    }
    res.end();
    return;
  } else if ((((req.url.startsWith("/api/products") || req.url.startsWith("/products")) || (req.url.startsWith("/api/categories") || req.url.startsWith("/categories"))) && req.method != "GET") || ((req.url.startsWith("/api/orders") ||
      req.url.startsWith("/orders")) && req.method != "POST")) {
    let token = req.headers["authorization"];
    if (token != null && token.startsWith("Bearer<")) {
      token = token.substring(7, token.length - 1);
      try {
        jwt.verify(token, APP_SECRET);
        next();
        return;
      } catch (err) {}
    }
    res.statusCode = 401;
    res.end();
    return;
  }
  next();
}