GAS Simple Auth System

A lightweight authentication system built with Google Apps Script that uses Google Spreadsheet as a database. This project provides a simple but functional login, registration, and session management system that can be quickly deployed as a web app.

Features

• 🔐 User registration with basic validation
• 🔑 Secure login system with password encryption (HMAC-SHA256)
• 📊 Google Spreadsheet as database for user management
• 💾 Session management using Google Apps Script Properties Service
• 📱 Responsive design that works on mobile and desktop
• 🚀 Easy deployment as a Google Web App

Live Demo

Try the live demo: GAS Simple Auth System Demo

Quick Start Guide

Option 1: Copy the Google Apps Script project (Recommended)

1. Open this Google Apps Script project (request access if needed)
2. Make a copy: File > Make a copy
3. Set your encryption key in the Code.gs file
4. Deploy as a web app (Deploy > New deployment > Web App)

Option 2: Manual setup

1. Create a new Google Apps Script project at script.google.com
2. Create two files:
   • Code.gs: Copy the content from Code.gs in this repository
   • index.html: Copy the content from index.html in this repository
3. Update the ENCRYPTION_KEY variable in the Code.gs file
4. Deploy as a web app (Deploy > New deployment > Web App)

Detailed Installation & Configuration

See the Installation Guide for detailed step-by-step instructions.

Security Considerations

This system provides basic authentication capabilities but has some security limitations:

• Password encryption uses HMAC-SHA256 which is better than plain text but not as secure as bcrypt
• Google Apps Script Properties Service has storage limits for session data
• No CSRF protection is implemented in this basic version
• No rate limiting for login attempts

For production environments, we recommend enhancing the security or using dedicated authentication services.

Customization

You can easily customize:

• The visual design by modifying the CSS in index.html
• Form validation rules in the JavaScript code
• User data structure by adding columns to the spreadsheet and updating the code

Contributing

Contributions are welcome! Feel free to:

• Open issues for bugs or feature requests
• Submit pull requests with improvements
• Share your customizations or extensions

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgements

• Google Apps Script documentation and community
• All contributors and users providing feedback

---

⭐ If you find this project useful, please consider giving it a star on GitHub! ⭐