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routes/auth.js

+const { Router } = require('express')
+const passport = require('passport')
+
+// init router for auth
+let router = Router()
+
+router.get('/login', function (req, res) {
+
+    if (req.user) res.redirect('/dashboard') // if auth
+    else res.redirect('/auth/login/google') // if not auth
+
+})
+
+// login redirect
+router.get('/login/google', passport.authenticate("google", {
+    scope: ['profile', "https://www.googleapis.com/auth/drive.file", "email"]
+}))
+
+// callback from google oauth (with token)
+router.get('/google/redirect', passport.authenticate('google'), function (req, res) {
+
+    res.redirect('/dashboard')
+})
+
+// logout
+router.get('/logout', function (req, res) {
+    req.logOut();
+    res.redirect('/')
+})
+
+module.exports = router
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