[#1#2#3] DB모델 객체 및 로그인 ,회원가입 구현

middleware/auth.js

+// middlewares/auth.js
+
+exports.isLoggedIn = (req, res, next) => {
+  if (req.isAuthenticated()) {
+    return next();
+  }
+  res.redirect('/auth/login');
+};
+
+exports.isNotLoggedIn = (req, res, next) => {
+  if (!req.isAuthenticated()) {
+    return next();
+  }
+  res.redirect('/');
+};