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| 1 | +# Development Context - Second Brain v4.2.3 |
| 2 | + |
| 3 | +## Current State (August 15, 2025) |
| 4 | + |
| 5 | +### ✅ What's Working |
| 6 | +- **PostgreSQL Backend**: Production-ready with pgvector for embeddings |
| 7 | +- **Google Drive Integration**: Full OAuth flow implemented and functional |
| 8 | + - User can authenticate with Google account |
| 9 | + - List and browse Google Drive files |
| 10 | + - Sync files to PostgreSQL as memories |
| 11 | + - Generate OpenAI embeddings (when API key configured) |
| 12 | +- **Code Quality**: 10/10 linting score, PEP8 compliant, properly formatted |
| 13 | +- **Tests**: All 28 tests passing locally and in CI |
| 14 | +- **UI**: Beautiful Google Drive interface at `/static/gdrive-ui.html` |
| 15 | + |
| 16 | +### 🔧 Current Implementation Details |
| 17 | + |
| 18 | +#### Google OAuth Flow (Accurate as of Session 7) |
| 19 | +1. **User Action**: Click "Connect Google Drive" in frontend |
| 20 | +2. **Backend Request**: Frontend calls `/api/v1/gdrive/connect` endpoint |
| 21 | +3. **Authorization URL Generation**: Backend constructs OAuth 2.0 URL with parameters |
| 22 | +4. **Redirect to Google**: Frontend redirects browser to authorization URL |
| 23 | +5. **User Consent**: User approves requested permissions (drive.readonly) |
| 24 | +6. **Redirect to Callback**: Google redirects to `http://localhost:8001/api/v1/gdrive/callback` |
| 25 | +7. **Code Exchange**: Callback exchanges authorization code for tokens |
| 26 | +8. **Token Storage**: Currently stored IN MEMORY (problem - lost on restart) |
| 27 | +9. **Confirmation**: User shown success page |
| 28 | + |
| 29 | +#### Key Files |
| 30 | +- `app/routes/gdrive_real.py`: FastAPI endpoints for OAuth flow |
| 31 | +- `app/services/google_drive_simple.py`: Google Drive API business logic |
| 32 | +- `docs/google-drive-integration.md`: User-facing setup guide |
| 33 | + |
| 34 | +### ⚠️ Critical Issues |
| 35 | + |
| 36 | +1. **Token Persistence**: Tokens stored in memory are lost on restart |
| 37 | + - User must re-authenticate every time server restarts |
| 38 | + - No refresh token logic implemented |
| 39 | + - Not suitable for production use |
| 40 | + |
| 41 | +2. **Security Considerations** |
| 42 | + - Tokens should be encrypted before storage |
| 43 | + - Need secure local storage solution |
| 44 | + - Must not commit tokens to git |
| 45 | + |
| 46 | +### 🎯 Next Steps (Priority Order) |
| 47 | + |
| 48 | +1. **Implement Token Persistence** |
| 49 | + - Store tokens in `.gdrive_tokens.json` (local file) |
| 50 | + - Encrypt tokens using Fernet encryption |
| 51 | + - Add to `.gitignore` to prevent git commits |
| 52 | + |
| 53 | +2. **Add Token Refresh Logic** |
| 54 | + - Check if access token expired before API calls |
| 55 | + - Use refresh token to get new access token |
| 56 | + - Update stored tokens automatically |
| 57 | + |
| 58 | +3. **Improve User Experience** |
| 59 | + - Auto-reconnect on server restart if tokens exist |
| 60 | + - Show connection status in UI |
| 61 | + - Handle token expiration gracefully |
| 62 | + |
| 63 | +## User Preferences & Context |
| 64 | + |
| 65 | +### Development Style |
| 66 | +- **Autonomous Mode**: No confirmations needed, execute immediately |
| 67 | +- **Cross-Platform**: Works on Windows, macOS, Linux |
| 68 | +- **No Co-Author Lines**: Don't add co-author lines to commits |
| 69 | +- **Production Focus**: Real implementation, not demos |
| 70 | + |
| 71 | +### Technical Constraints |
| 72 | +- **Single User**: Designed for personal use |
| 73 | +- **Docker Deployment**: Will run in Docker container |
| 74 | +- **PostgreSQL Only**: No SQLite, Redis, or other databases |
| 75 | +- **Local Storage OK**: Can use local files for single-user tokens |
| 76 | + |
| 77 | +## Session History |
| 78 | + |
| 79 | +### Session 7 (August 15, 2025) |
| 80 | +- Implemented real Google Drive integration |
| 81 | +- Fixed all linting and code quality issues |
| 82 | +- Cleaned up repository (removed 17 temp files) |
| 83 | +- Added proper dependencies to requirements.txt |
| 84 | +- Tests passing in CI |
| 85 | +- **Issue Identified**: Token persistence needed |
| 86 | + |
| 87 | +### Previous Sessions |
| 88 | +- Sessions 1-6: Built v4.2.3 with PostgreSQL backend |
| 89 | +- Extensive testing and documentation cleanup |
| 90 | +- Security patches applied |
| 91 | +- Production-ready base system |
| 92 | + |
| 93 | +## Architecture Decisions |
| 94 | + |
| 95 | +### Token Storage Solution (Proposed) |
| 96 | +```python |
| 97 | +# Store in: .gdrive_tokens.json |
| 98 | +{ |
| 99 | + "access_token": "encrypted_token_here", |
| 100 | + "refresh_token": "encrypted_token_here", |
| 101 | + "token_expiry": "2025-08-15T12:00:00Z", |
| 102 | + |
| 103 | +} |
| 104 | +``` |
| 105 | + |
| 106 | +### Security Implementation |
| 107 | +- Use `cryptography.fernet` for symmetric encryption |
| 108 | +- Derive key from `ENCRYPTION_KEY` in `.env` |
| 109 | +- Never store plaintext tokens |
| 110 | +- Validate token integrity on load |
| 111 | + |
| 112 | +## Testing Status |
| 113 | + |
| 114 | +### What's Tested |
| 115 | +- Basic functionality (28 tests) |
| 116 | +- Import verification |
| 117 | +- Mock services |
| 118 | +- Factory pattern |
| 119 | + |
| 120 | +### What Needs Testing |
| 121 | +- Token persistence |
| 122 | +- Token refresh logic |
| 123 | +- OAuth flow end-to-end |
| 124 | +- File sync with real embeddings |
| 125 | + |
| 126 | +## Dependencies Added |
| 127 | +- `redis==5.0.1` (for tests) |
| 128 | +- `aiohttp==3.9.5` (for async HTTP) |
| 129 | +- `google-auth==2.32.0` |
| 130 | +- `google-auth-oauthlib==1.2.0` |
| 131 | +- `google-api-python-client==2.137.0` |
| 132 | + |
| 133 | +## Environment Variables |
| 134 | +```bash |
| 135 | +# Google OAuth (configured) |
| 136 | +GOOGLE_CLIENT_ID=741796279744-ed8polbgfqjttqt2vlpgmofs7gho8kbl.apps.googleusercontent.com |
| 137 | +GOOGLE_CLIENT_SECRET=***hidden*** |
| 138 | +GOOGLE_REDIRECT_URI=http://localhost:8001/api/v1/gdrive/callback |
| 139 | + |
| 140 | +# Encryption (for token storage) |
| 141 | +ENCRYPTION_KEY=test-encryption-key # Should be strong in production |
| 142 | +``` |
| 143 | + |
| 144 | +## Known Issues & Workarounds |
| 145 | + |
| 146 | +1. **Python 3.13 Compatibility** |
| 147 | + - Some packages (numpy, pandas) don't support 3.13 yet |
| 148 | + - Temporarily disabled in requirements.txt |
| 149 | + |
| 150 | +2. **Mock Database Fallback** |
| 151 | + - System falls back to mock DB if PostgreSQL unavailable |
| 152 | + - Good for testing, but user should use real PostgreSQL |
| 153 | + |
| 154 | +3. **OpenAI Embeddings** |
| 155 | + - Currently using mock key |
| 156 | + - User needs real OpenAI API key for embeddings |
| 157 | + |
| 158 | +## Success Metrics |
| 159 | +- ✅ Google Drive authentication works |
| 160 | +- ✅ Files can be listed and synced |
| 161 | +- ✅ Memories stored in PostgreSQL |
| 162 | +- ✅ Code quality 10/10 |
| 163 | +- ✅ Tests passing |
| 164 | +- ❌ Tokens persist across restarts (TODO) |
| 165 | +- ❌ Automatic token refresh (TODO) |
| 166 | + |
| 167 | +## Next Session Goals |
| 168 | +1. Implement token persistence with encryption |
| 169 | +2. Add refresh token logic |
| 170 | +3. Test full flow with restart |
| 171 | +4. Document token security model |
| 172 | +5. Consider adding progress indicators for large file syncs |
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