feat: callback google auth

server/src/routes/auth.ts

@@ -22,3 +22,17 @@ router.get('/auth/google', (req, res) => {
   });
   res.redirect(url);
 });
+
+// Callback route for Google OAuth 2.0
+router.get('/auth/google/callback', async (req, res) => {
+    const { code } = req.query;
+    try {
+      const { tokens } = await oauth2Client.getToken(code);
+      oauth2Client.setCredentials(tokens);
+      // Store tokens securely (e.g., in a database)
+      res.send('Authentication successful');
+    } catch (error) {
+      console.error('Error during authentication:', error);
+      res.status(500).send('Authentication failed');
+    }
+  });