initial commit

server/config/passport.js

@@ -0,0 +1,56 @@
+const passport = require("passport");
+const User = require("../models/User");
+require("dotenv").config();
+const GoogleStrategy = require("passport-google-oauth20").Strategy;
+
+passport.use(
+  new GoogleStrategy(
+    {
+      clientID: process.env.GOOGLE_CLIENT_ID,
+      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
+      callbackURL: "http://localhost:8080/auth/google/callback",
+      scope: ["profile", "email", "displayName"],
+    },
+    async (accessToken, refreshToken, profile, done) => {
+      try {
+        // Check if a user with the same email already exists
+        let user = await User.findOne({ email: profile.emails[0].value });
+
+        if (user) {
+          // If the user exists, update their Google ID and profile information
+          user.googleId = profile.id;
+          user.username = profile.displayName;
+          user.profilePicture = profile.photos[0].value;
+          await user.save();
+          return done(null, user);
+        } else {
+          // If the user doesn't exist, create a new user
+          const newUser = new User({
+            googleId: profile.id,
+            username: profile.displayName,
+            email: profile.emails[0].value,
+            profilePicture: profile.photos[0].value,
+          });
+
+          user = await newUser.save();
+          return done(null, user);
+        }
+      } catch (error) {
+        return done(error, false);
+      }
+    }
+  )
+);
+
+passport.serializeUser((user, done) => {
+  done(null, user.id); // Use user id for serialization
+});
+
+passport.deserializeUser(async (id, done) => {
+  try {
+    const user = await User.findById(id); // Fetch user by id from MongoDB
+    done(null, user); // Pass the user object to the next middleware
+  } catch (error) {
+    done(error, false);
+  }
+});