# GDPR Implementation Status (Issue #42)

**Date**: 2025-10-30
**Status**: 🟢 In Progress - Backend Business Logic Complete
**Completion**: ~50% (Domain + Application layers ready, Infrastructure pending)

## ✅ Completed (Phases 1-2.3)

### Phase 1: Database & Domain Layer

#### 1.1 Migration ✅
- **File**: `backend/migrations/20251030093756_add_gdpr_anonymization_fields.sql`
- **Changes**:
  - Added `is_anonymized` (BOOLEAN) to `users` and `owners` tables
  - Added `anonymized_at` (TIMESTAMPTZ) to `users` and `owners` tables
  - Created indexes: `idx_users_is_anonymized`, `idx_owners_is_anonymized`
- **Commit**: `ec376d9` - chore(db): add GDPR anonymization fields
- **Tests**: Migration applied successfully ✅

#### 1.2 Domain Entities ✅
- **File**: `backend/src/domain/entities/gdpr_export.rs`
- **Entities**:
  - `GdprExport`: Main aggregate
  - `UserData`: User account info
  - `OwnerData`: Owner profile info
  - `RelatedData`: Container for units, expenses, documents, meetings
  - Supporting types: `UnitOwnershipData`, `ExpenseData`, `DocumentData`, `MeetingData`
- **Features**:
  - Pure domain logic, no dependencies
  - Builder methods for data aggregation
  - Anonymization status tracking
  - JSON serialization support
- **Commit**: `3a4e11c` - feat(domain): add GDPR export domain entities
- **Tests**: 9/9 passed ✅

### Phase 2: Application Layer (Ports & DTOs)

#### 2.1 Repository Port ✅
- **File**: `backend/src/application/ports/gdpr_repository.rs`
- **Trait**: `GdprRepository`
- **Methods**:
  - `aggregate_user_data(user_id, organization_id)` - Article 15 export
  - `anonymize_user(user_id)` - Article 17 erasure
  - `anonymize_owner(owner_id)` - Article 17 erasure
  - `find_owner_ids_by_user(user_id, organization_id)` - Helper
  - `check_legal_holds(user_id)` - Deletion eligibility
  - `is_user_anonymized(user_id)` - Status check
- **Features**:
  - Async trait with Send + Sync bounds
  - Comprehensive documentation
  - Mock implementation for testing
- **Commit**: `ec916bc` - feat(ports): define GdprRepository trait
- **Tests**: 4/4 passed ✅

#### 2.2 DTOs ✅
- **File**: `backend/src/application/dto/gdpr_dto.rs`
- **DTOs**:
  - `GdprExportResponseDto`: Complete export response
  - `UserDataDto`, `OwnerDataDto`, etc.: Nested DTOs
  - `GdprEraseRequestDto`: Erasure request
  - `GdprEraseResponseDto`: Erasure response
- **Features**:
  - From trait implementations for domain-to-DTO conversion
  - RFC3339 timestamp formatting
  - UUID to String conversion
  - Full JSON serialization support
- **Commit**: `8960840` - feat(dto): add GDPR export and erase DTOs
- **Tests**: 6/6 passed ✅

#### 2.3 Use Cases ✅
- **File**: `backend/src/application/use_cases/gdpr_use_cases.rs`
- **Struct**: `GdprUseCases`
- **Methods**:
  - `export_user_data(user_id, requesting_user_id, organization_id)` - Export with authorization
  - `erase_user_data(user_id, requesting_user_id, organization_id)` - Erasure with validation
  - `can_erase_user(user_id)` - Check legal holds
- **Features**:
  - Authorization: self-service + SuperAdmin bypass
  - Validation: anonymization status, legal holds
  - Transaction handling: user + multiple owners
  - Error handling: clear messages for all scenarios
- **Commit**: `9729db6` - feat(use-case): implement GDPR use cases
- **Tests**: 9/9 passed ✅

---

## 🚧 Remaining Work (Phases 3-14)

### Phase 3: Repository Implementation (🔴 TODO - HIGH PRIORITY)
**Files to create**:
- `backend/src/infrastructure/database/repositories/gdpr_repository_impl.rs`

**Methods** (implement GdprRepository trait):
```rust
pub struct GdprUseCases {
    gdpr_repository: Arc<dyn GdprRepository>,
}

impl GdprUseCases {
    // Export user data (GDPR Article 15)
    pub async fn export_user_data(
        &self,
        user_id: Uuid,
        organization_id: Option<Uuid>,
    ) -> Result<GdprExportResponseDto, String>

    // Erase user data (GDPR Article 17)
    pub async fn erase_user_data(
        &self,
        user_id: Uuid,
        requesting_user_id: Uuid,
    ) -> Result<GdprEraseResponseDto, String>

    // Check if user can be erased
    pub async fn can_erase_user(&self, user_id: Uuid) -> Result<bool, String>
}
```

**Tests to write**:
- Unit tests with mock repository
- Test export with/without data
- Test erasure permissions
- Test legal holds blocking

---

### Phase 3.1: Repository Implementation (🔴 TODO)
**Files to create**:
- `backend/src/infrastructure/database/repositories/gdpr_repository_impl.rs`

**Implementation**:
```rust
pub struct PostgresGdprRepository {
    pool: Arc<PgPool>,
}

impl GdprRepository for PostgresGdprRepository {
    async fn aggregate_user_data(...) -> Result<GdprExport, String> {
        // Complex SQL queries with JOINs:
        // 1. Fetch user from users table
        // 2. Fetch owners from owners table (WHERE user matches)
        // 3. Fetch units via unit_owners + units + buildings
        // 4. Fetch expenses from expenses table
        // 5. Fetch documents from documents table
        // 6. Fetch meetings from meetings table
        // Build GdprExport aggregate
    }

    async fn anonymize_user(...) -> Result<(), String> {
        // UPDATE users SET
        //   email = CONCAT('anonymized-', id, '@deleted.local'),
        //   first_name = 'Anonymized',
        //   last_name = 'User',
        //   is_anonymized = TRUE,
        //   anonymized_at = NOW()
        // WHERE id = user_id AND is_anonymized = FALSE
    }

    async fn anonymize_owner(...) -> Result<(), String> {
        // Similar UPDATE for owners table
    }

    // Implement remaining methods...
}
```

**Tests to write**:
- Integration tests with testcontainers PostgreSQL
- Test data aggregation with real database
- Test anonymization transactions
- Test referential integrity preservation

---

### Phase 4.1: Web Handlers (🔴 TODO)
**Files to create**:
- `backend/src/infrastructure/web/handlers/gdpr_handlers.rs`

**Handlers**:
```rust
// GET /api/v1/gdpr/export
pub async fn export_user_data_handler(
    state: web::Data<AppState>,
    user: AuthenticatedUser,
) -> impl Responder

// DELETE /api/v1/gdpr/erase
pub async fn erase_user_data_handler(
    state: web::Data<AppState>,
    user: AuthenticatedUser,
) -> impl Responder
```

**Files to modify**:
- `backend/src/infrastructure/web/routes.rs` - Add GDPR routes
- `backend/src/infrastructure/web/app_state.rs` - Add gdpr_use_cases
- `backend/src/infrastructure/web/handlers/mod.rs` - Export handlers

**Tests to write**:
- E2E tests with Actix test framework
- Test authentication required (401 without token)
- Test authorization (user can only export self)
- Test SuperAdmin permissions

---

### Phase 4.2: Audit Logging (🔴 TODO)
**Files to modify**:
- `backend/src/infrastructure/audit.rs`

**Changes**:
```rust
pub enum AuditEventType {
    // ... existing events

    // GDPR events
    GdprDataExported,
    GdprDataErased,
    GdprExportFailed,
    GdprErasureFailed,
}
```

**Integration**:
- Log all GDPR operations in handlers
- Include user_id, organization_id, success/failure
- Preserve audit logs even after anonymization (legal requirement)

---

### Phase 5-7: Data Erasure Complete (🔴 TODO)
- Extend use cases with erasure logic
- Implement anonymization in repositories (with transactions)
- Create erase endpoint handlers
- Add comprehensive tests

---

### Phase 8: Admin Endpoints (🔴 TODO)
**Endpoints**:
- `GET /api/v1/admin/gdpr/exports` - List all export requests (SuperAdmin)
- `POST /api/v1/admin/gdpr/erase/:user_id` - Manual erasure (SuperAdmin)

---

### Phase 9: BDD Tests (🔴 TODO)
**Files to create**:
- `backend/tests/features/gdpr.feature`

**Scenarios**:
```gherkin
Feature: GDPR Compliance
  Scenario: User exports personal data
    Given I am authenticated as "john.doe@example.com"
    When I request my GDPR data export
    Then I should receive a JSON with my complete data
    And the export should include user, owners, units, expenses

  Scenario: User requests account deletion
    Given I am authenticated as "jane.smith@example.com"
    When I request account deletion
    Then my personal data should be anonymized
    And my user account should be marked as anonymized
```

---

### Phase 10-11: Frontend (🔴 TODO)

#### Privacy Settings Page
**Files to create**:
- `frontend/src/pages/privacy.astro`
- `frontend/src/components/PrivacySettings.svelte`
- `frontend/src/components/GdprExportModal.svelte`
- `frontend/src/components/GdprEraseModal.svelte`

**Features**:
- "Download my data" button → triggers export API call
- "Delete my account" button → confirmation modal → erasure API call
- Display anonymization status

#### Admin Dashboard
**Files to create**:
- `frontend/src/pages/admin/gdpr.astro`
- `frontend/src/components/admin/GdprDashboard.svelte`

**Features**:
- List of anonymized users
- Manual erasure form (SuperAdmin only)
- GDPR statistics (exports, erasures)

---

### Phase 12: Playwright E2E Tests (🔴 TODO)
**Files to create**:
- `frontend/tests/e2e/gdpr-user.spec.ts`
- `frontend/tests/e2e/gdpr-admin.spec.ts`

**Scenarios**:
- User journey: Login → Privacy page → Export data
- User journey: Login → Privacy page → Delete account
- Admin journey: Login as SuperAdmin → GDPR dashboard → Manual erase

---

### Phase 13: Documentation (🔴 TODO)
**Files to create/modify**:
- `docs/GDPR_COMPLIANCE.md` - Full compliance documentation
- `CLAUDE.md` - Update with GDPR sections
- `docs/ROADMAP.md` - Mark issue #42 as completed

**Content**:
- Legal compliance procedures
- Data retention policies (7 years Belgium)
- Anonymization vs deletion strategy
- API documentation with examples
- User guide for privacy settings

---

### Phase 14: Quality & Final Review (🔴 TODO)

**Quality checks**:
```bash
make format    # Auto-format
make lint      # Zero clippy warnings
make test      # All tests pass
make coverage  # > 80% coverage target
```

**Final validation**:
- Manual E2E test of complete workflow
- Verify audit logs in database
- Validate JSON export format (GDPR Article 20 compliance)
- Legal review (if applicable)

---

## 📊 Statistics

### Completed ✅
- **Commits**: 6
- **Files created**: 10 (including plans)
- **Files modified**: 6
- **Tests written**: 28 (all passing ✅)
  - Domain entities: 9 tests
  - Repository port: 4 tests
  - DTOs: 6 tests
  - Use Cases: 9 tests
- **Lines of code**: ~2500

### Remaining 🔴
- **Estimated commits**: 15-20
- **Files to create**: ~12-15
- **Files to modify**: ~8-10
- **Tests to write**: ~40-50
- **Estimated time**: 4-6 hours

---

## 🚀 Quick Start to Continue

### Resume development:
```bash
# 1. Ensure DB is running
docker compose up -d postgres

# 2. Create use cases file
nano backend/src/application/use_cases/gdpr_use_cases.rs

# 3. Follow TDD: Write tests first, then implementation
cd backend && cargo test --lib application::use_cases::gdpr_use_cases

# 4. Implement repository
nano backend/src/infrastructure/database/repositories/gdpr_repository_impl.rs

# 5. Integration tests
cargo test --test integration

# 6. Create handlers
nano backend/src/infrastructure/web/handlers/gdpr_handlers.rs

# 7. Test complete backend
cargo test

# 8. Frontend development
cd frontend && npm install && npm run dev
```

---

## 📋 Architecture Summary

### Layers Implemented ✅
1. **Domain Layer**: Pure business entities (`GdprExport`, `UserData`, etc.)
2. **Application Layer - Ports**: Repository interface (`GdprRepository`)
3. **Application Layer - DTOs**: API contracts (Request/Response DTOs)

### Layers Remaining 🔴
4. **Application Layer - Use Cases**: Business logic orchestration
5. **Infrastructure Layer - Repository**: PostgreSQL implementation
6. **Infrastructure Layer - Web**: HTTP handlers and routes
7. **Infrastructure Layer - Audit**: GDPR event logging
8. **Presentation Layer**: Frontend pages and components
9. **Testing**: Integration, E2E, BDD scenarios

### Benefits of Foundation
- ✅ Clean architecture validated
- ✅ Type-safe domain models
- ✅ Clear contracts (ports & DTOs)
- ✅ Easy to test (mocks available)
- ✅ GDPR-compliant data structures

---

## 🔗 References

- **Issue**: #42
- **Plan**: `.claude/plans/GDPR_IMPLEMENTATION_PLAN.md` & `docs/plans/GDPR_IMPLEMENTATION_PLAN.md`
- **Changelog**: `docs/CHANGELOG.md`
- **Commits**:
  - `ec376d9` - Database migration
  - `3a4e11c` - Domain entities
  - `ec916bc` - Repository port
  - `8960840` - DTOs
  - `8f707ad` - Documentation status
  - `9729db6` - Use Cases

---

## 📝 Notes

- Database schema ready for anonymization
- Domain layer fully isolated (no deps)
- Hexagonal architecture respected
- All existing tests passing
- Ready for repository implementation
- Foundation stable and extensible