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IMPLEMENTATION_SUMMARY.md

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Implementation Summary

Recent Updates (Dec 31, 2025)

✅ Authentication & Token Management

1. Token Refresh Mechanism

  • Automatic Token Refresh: Implemented automatic access token refresh when 401 errors occur
  • Request Queuing: Multiple failed requests are queued and automatically retried after token refresh
  • Dual Token Storage: Tokens stored in both localStorage (persistence) and memory (SSR support)
  • Helper Functions:
    • setToken(token) - Save access token
    • setRefreshToken(token) - Save refresh token
    • getStoredToken() - Get access token
    • getStoredRefreshToken() - Get refresh token
    • clearStoredToken() - Clear all tokens

2. Enhanced Login/Register

  • Both useLogin and useRegister hooks now save both access and refresh tokens
  • Automatic cache invalidation and user data update on success
  • Type-safe inputs and responses

3. Refresh Flow

Request (401) → Get Refresh Token → POST /api/auth/refresh 
→ Save New Tokens → Retry Original Request → Resume Queued Requests

If refresh fails:

Refresh Failed → Clear All Tokens → Redirect to /login

✅ Typography

Poppins Font Integration

  • Source: Google Fonts - Poppins
  • Implementation: Using Next.js next/font/google for optimal performance
  • Weights: 300, 400, 500, 600, 700
  • Features:
    • Automatic font optimization
    • Variable font support (--font-poppins)
    • Applied to both sans and heading font families
    • Zero layout shift with display: swap

📁 Files Modified

SDK (Authentication):

  • packages/sdk/src/client.ts - Token refresh logic and storage
  • packages/sdk/src/services/mutations/auth/useLogin/index.ts - Save both tokens
  • packages/sdk/src/services/mutations/auth/useRegister/index.ts - Save both tokens

Web App (Font):

  • apps/web/app/layout.tsx - Poppins font integration
  • packages/design-system/tailwind.config.ts - Font family configuration

Documentation:

  • packages/sdk/AUTH_FLOW.md - Comprehensive authentication documentation

🔧 Technical Details

Token Refresh Implementation

// Automatic refresh on 401
client.interceptors.response.use(
  (response) => response,
  async (error) => {
    if (error.response?.status === 401 && !originalRequest._retry) {
      // Queue request
      // Refresh token
      // Retry request
    }
  }
);

Font Configuration

// Next.js Layout
import { Poppins } from "next/font/google";

const poppins = Poppins({
  subsets: ["latin"],
  weight: ["300", "400", "500", "600", "700"],
  variable: "--font-poppins",
  display: "swap",
});

// Applied via className
<html className={poppins.variable}>
  <body className={poppins.className}>

🚀 What's Working

  1. ✅ Automatic Token Refresh - No manual intervention needed
  2. ✅ Request Queuing - Multiple requests handled correctly during refresh
  3. ✅ Persistent Auth - Tokens survive page refresh
  4. ✅ Type Safety - Full TypeScript support
  5. ✅ Modern Typography - Poppins font loaded and applied
  6. ✅ Optimized Performance - Next.js font optimization active

📋 Next Steps

Potential areas for future enhancement:

  1. Implement protected route HOC/middleware
  2. Add token expiry checks before requests
  3. Consider httpOnly cookies for refresh tokens (more secure)
  4. Add refresh token rotation on backend
  5. Implement remember-me functionality
  6. Add token blacklisting on logout

🧪 Testing

To test the authentication flow:

// Login
const login = useLogin();
await login.mutateAsync({ email, password });
// → Tokens automatically saved

// Make authenticated request
const { data } = useMe();
// → Token automatically added to headers

// Token expires
// → Automatic refresh triggered
// → Request retried with new token

// Refresh fails
// → Redirected to /login

📚 Documentation

Full authentication documentation available at:

  • packages/sdk/AUTH_FLOW.md - Complete guide with examples

🎨 Design System

Poppins font is now the default font for:

  • All body text (font-sans)
  • All headings (font-heading)
  • All Design System components

Access via Tailwind classes:

<h1 className="font-sans">Uses Poppins</h1>
<h2 className="font-heading">Also Poppins</h2>

🔗 Related PRs

  • feat: add token refresh mechanism and Poppins font (790d41cb)
  • docs: add comprehensive authentication flow documentation (462e841a)
  • fix: correct SdkProvider usage and ApiProvider config handling (6f5261e5)
  • docs: update absolute paths guide with @sdk alias (f24b0fd3)

Last Updated: Dec 31, 2025 Status: ✅ Ready for Testing Dev Server: http://localhost:3001