add loginGoogleAuth

controllers/userController.js

@@ -1,6 +1,8 @@
 const asyncHandler = require('express-async-handler');
 const user = require('../models/user');
 const sendToken = require('../utils/jwtToken');
+const axios = require('axios');
+const dotenv = require("dotenv").config();
 
 // Get all users => GET api/users
 const getAllUser = asyncHandler(async (req, res) => {
@@ -109,4 +111,56 @@ const logoutUser = asyncHandler(async (req, res) => {
     });
 });
 
-module.exports = { getAllUser, createUser, deleteUser, updateUser, loginUser, logoutUser };
+const googleAuth = asyncHandler(async (req, res) => {
+    try {
+        // get the code from frontend
+        const code = req.headers.authorization;
+        console.log('Authorization Code:', code);
+        
+        // Exchange the authorization code for an access token
+        const response = await axios.post(
+            'https://oauth2.googleapis.com/token',
+            {
+                code,
+                client_id: process.env.CLIENT_ID,
+                client_secret: process.env.CLIENT_SECRET,
+                redirect_uri: 'postmessage',
+                grant_type: 'authorization_code'
+            }
+        );
+        const accessToken = response.data.access_token;
+        console.log('Access Token:', accessToken);
+        
+        // Fetch user details using the access token
+        const userResponse = await axios.get(
+            'https://www.googleapis.com/oauth2/v3/userinfo',
+            {
+                headers: {
+                    Authorization: `Bearer ${accessToken}`
+                }
+            }
+        );
+        const userDetails = userResponse.data;
+        console.log('User Details:', userDetails);
+        
+        // Process user details and perform necessary actions
+
+        const users = await user.findOne({ email: userDetails.email })
+
+        if(!users){
+            const newUser = await user.create({
+                username: userDetails.name,
+                password:"nothing",
+                email: userDetails.email,
+                isGoogleAccount: userDetails.email_verified
+            });
+        }
+        
+        sendToken(users, 200, res);
+    } catch (error) {
+        console.error('Error saving code:', error);
+        res.status(500).json({ message: 'Failed to save code' });
+    }
+});
+
+module.exports = { getAllUser, createUser, deleteUser, updateUser, loginUser, logoutUser , googleAuth};