# 🚀 OAuth Migration to @atproto/oauth-client-browser

Your app has been successfully set up with a new, simplified OAuth implementation using the official `@atproto/oauth-client-browser` package. This migration will replace ~1000 lines of custom OAuth code with a robust, officially-maintained solution.

## 📁 New Files Created

### Core OAuth Implementation
- **`app/src/lib/oauth-client.ts`** - OAuth client setup and configuration
- **`app/src/lib/auth-context-new.tsx`** - New auth context using OAuth client
- **`app/src/lib/api-client.ts`** - Simplified API calls using OAuth sessions

### Updated Pages
- **`app/src/app/auth/login/page-new.tsx`** - Simplified login page
- **`app/src/app/auth/callback/page-new.tsx`** - Simplified callback handling

### Documentation & Scripts
- **`OAUTH_MIGRATION_GUIDE.md`** - Detailed migration guide
- **`test-new-oauth.js`** - Script to test new implementation
- **`restore-oauth.js`** - Script to restore original implementation

## 🧪 How to Test the New Implementation

### 1. Test the New OAuth System

```bash
# Run the test setup script
./test-new-oauth.js

# Start the development server
cd app && npm run dev
```

### 2. Test Authentication Flow

1. **Visit** http://localhost:3000
2. **Click Login** to go to the new login page
3. **Test with different handles:**
   - Bluesky: `yourhandle.bsky.social`
   - Third-party PDS: `handle.geese.blue`
   - Custom domain: `yourhandle.yourdomain.com`
4. **Verify** the callback completes successfully
5. **Check** that you're authenticated on the home page

### 3. Test Session Management

1. **Sign in** and verify it works
2. **Refresh the page** - should stay signed in
3. **Close and reopen browser** - should restore session
4. **Test sign out** - should clear session properly

### 4. Restore Original (if needed)

```bash
# Restore the original implementation
./restore-oauth.js
```

## ✨ Key Benefits of Migration

### **Simplified Codebase**
- Removes ~1000 lines of custom OAuth code
- No more manual PKCE flow implementation
- No more custom DPoP token generation
- No more complex nonce handling
- Eliminates custom API routes (`/api/auth/token`, `/api/auth/nonce`)

### **Better Reliability**
- Official implementation tested across many applications
- Automatic token refresh with proper retry logic
- Better error handling and recovery
- Proper session lifecycle management

### **Enhanced Security**
- Uses secure IndexedDB storage instead of localStorage
- Follows latest AT Protocol OAuth specifications
- Automatic DPoP implementation
- Better session invalidation handling

### **Improved Developer Experience**
- Direct integration with `@atproto/api` Agent
- Automatic handle resolution
- Built-in support for third-party PDS servers
- Event listeners for session changes
- Better TypeScript support

## 🔄 Migration Process (When Ready)

### Phase 1: Backup & Prepare
```bash
# Already done - scripts handle this automatically
```

### Phase 2: Switch to New Implementation
```bash
# Replace the auth context import in layout.tsx
# From: '@/lib/auth-context'
# To:   '@/lib/auth-context-new'
```

### Phase 3: Update Pages
```bash
# Replace login page
mv app/src/app/auth/login/page.tsx app/src/app/auth/login/page-old.tsx
mv app/src/app/auth/login/page-new.tsx app/src/app/auth/login/page.tsx

# Replace callback page
mv app/src/app/auth/callback/page.tsx app/src/app/auth/callback/page-old.tsx
mv app/src/app/auth/callback/page-new.tsx app/src/app/auth/callback/page.tsx
```

### Phase 4: Update API Calls
Replace complex API calls throughout your app:

```tsx
// Before
import { getProfile } from '@/lib/bluesky-api'
const profile = await getProfile(accessToken, keyPair, dpopNonce, handle, pdsEndpoint)

// After  
import { getProfile } from '@/lib/api-client'
const profile = await getProfile(session)
```

### Phase 5: Cleanup (After Testing)
Remove old files when confident in the new implementation:
- `app/src/lib/bluesky-auth.ts`
- `app/src/lib/auth-context.tsx` (old version)
- `app/src/lib/storage-util.ts`
- `app/src/app/api/auth/token/route.ts`
- `app/src/app/api/auth/nonce/route.ts`

## 🛠 Compatibility Notes

### **Legacy Code Support**
The new auth context provides backward compatibility:
- `accessToken` → `session?.accessToken`
- `refreshToken` → `session?.refreshToken`
- `did` → `session?.sub`
- `handle` → `session?.info?.handle`
- `pdsEndpoint` → extracted from session info

### **Third-Party PDS Support**
Full support maintained for:
- ✅ Bluesky (bsky.social)
- ✅ Custom domains (alice.example.com)
- ✅ Third-party PDS (geese.blue, etc.)
- ✅ Self-hosted instances

### **Existing API Calls**
Most existing API calls will continue to work during transition period due to legacy compatibility properties.

## 🐛 Troubleshooting

### **If Login Fails**
1. Check browser console for errors
2. Verify client metadata is accessible at https://flushes.app/client-metadata.json
3. Ensure handle resolution is working
4. Test with a simple Bluesky handle first

### **If Session Not Restored**
1. Check if IndexedDB is enabled in browser
2. Verify no browser extensions blocking storage
3. Check for console errors during initialization

### **If API Calls Fail**
1. Verify session object has required properties
2. Check if using new API client methods
3. Ensure proper error handling for session expiration

## 📞 Support

If you encounter any issues:

1. **Check the logs** - The new implementation provides detailed console logging
2. **Test incrementally** - Use the test scripts to verify each step
3. **Rollback if needed** - The restore script quickly reverts changes
4. **Reference the guide** - See `OAUTH_MIGRATION_GUIDE.md` for detailed steps

## 🎉 Next Steps

1. **Test thoroughly** with the new implementation
2. **Update your components** to use the new auth context
3. **Migrate API calls** to use the new client
4. **Remove old files** once confident in the new system
5. **Enjoy** the simplified, more reliable OAuth flow!

The migration significantly reduces complexity while providing better reliability, security, and developer experience. The official `@atproto/oauth-client-browser` package handles all the OAuth complexity for you. 