AuthDemo

A demonstration of OAuth 2.0 Authorization Code Flow implementation with a Node.js backend and Android client application.

Features

• Complete OAuth 2.0 Authorization Code Flow implementation
• Node.js backend with Express.js
• Android app using Jetpack Compose
• Account Manager integration for token storage
• Chrome Custom Tabs for secure authentication
• JWT-based token authentication
• Clean and modern Material 3 UI

Backend Features

• OAuth 2.0 endpoints (/oauth/authorize, /oauth/token)
• Protected resource endpoint (/api/user)
• CORS support
• JWT token generation and validation
• Mock user database for testing
• Authorization code management with expiration

Android App Features

• Jetpack Compose UI
• Android Account Manager integration
• Chrome Custom Tabs for OAuth flow
• Retrofit for API communication
• Profile management
• Auto login/logout handling

Test Accounts

• Email: demo@example.com / Password: demo123
• Email: test@example.com / Password: test123

Setup

Backend Setup

1. Navigate to the server directory:

   cd server

2. Install dependencies:

   npm install

3. Create a .env file with:

   PORT=3000
   SECRET_KEY=your-oauth-demo-secret-key
   

4. Start the server:

   npm start

Android Setup

1. Open the project in Android Studio
2. Sync Gradle files
3. Run the app on an emulator or device

Architecture

• Backend: Node.js + Express.js
• Frontend: Android + Jetpack Compose
• Authentication: OAuth 2.0 Authorization Code Flow
• Token Storage: Android Account Manager
• API Communication: Retrofit + OkHttp