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):

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:

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:

// 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:

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:

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:

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:

# 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 ✅

Domain Layer: Pure business entities (GdprExport, UserData, etc.)
Application Layer - Ports: Repository interface (GdprRepository)
Application Layer - DTOs: API contracts (Request/Response DTOs)

Layers Remaining 🔴

Application Layer - Use Cases: Business logic orchestration
Infrastructure Layer - Repository: PostgreSQL implementation
Infrastructure Layer - Web: HTTP handlers and routes
Infrastructure Layer - Audit: GDPR event logging
Presentation Layer: Frontend pages and components
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