# Improvements & Code Review Notes

## Security Fixes Applied

### P0: Whitelist Bypass Vulnerability (FIXED)
**Issue:** Original whitelist check used `url.contains(domain)` which would allow bypass:
- `https://hobbs.farm.evil.com` would match `hobbs.farm` ❌

**Fix:** Use proper domain boundary matching:
```kotlin
val host = Uri.parse(url).host?.lowercase() ?: return false
return whitelist.any { domain ->
    host == domain || host.endsWith(".$domain")
}
```

## Recommended Future Improvements

### P1: PIN Storage Security
- Current: Plain text in DataStore
- Recommended: SHA-256 hash with salt
- Implementation: Use `MessageDigest` to hash before storing

### P2: UX Enhancements
- Add loading indicator (ProgressBar) during page loads
- Add network error screen with retry button
- Consider swipe-to-refresh in admin settings

### P2: Code Quality
- Add unit tests for whitelist logic (added: WhitelistTest.kt)
- Add instrumented tests for WebView behavior
- Consider Kotlin coroutines for async operations

## Test Coverage

| Component | Tests | Status |
|-----------|-------|--------|
| Whitelist matching | 7 | ✅ |
| Idle timer | 6 | ✅ |
| Config validation | 16 | ✅ |
| Boot receiver | - | N/A (integration) |

**Total Unit Tests: 29**

### Test Files
- `WhitelistTest.kt` — URL whitelist logic with bypass prevention
- `IdleTimerTest.kt` — Timeout calculations and edge cases
- `ConfigValidationTest.kt` — Homepage, PIN, and whitelist validation

### Future Tests (Instrumented)
- [ ] WebView URL blocking behavior
- [ ] Admin PIN dialog flow
- [ ] Lock Task Mode integration
- [ ] Boot receiver launch

---

*Code review by Spirit 👻*
*Coordinated by Pluto 🪐*