API Implementation History

This is the build trail for the Flask API — what was done, week by week. It is kept as a record (this project deliberately preserves the "how it got built" trail), separate from the Endpoint Reference. For the current, authoritative endpoint list and parameters, always use the reference; for releases, see the Changelog.

Implementation Status

Week 1: Foundation ✅ COMPLETE

1. ✅ API directory structure created
2. ✅ Configuration management (development, production, testing)
3. ✅ Flask extensions (CORS, Caching, Rate Limiting)
4. ✅ Flask app factory pattern
5. ✅ Metadata service layer with caching
6. ✅ Scorecard service layer (works with pandas DataFrames)
7. ✅ Health check routes
8. ✅ Standard response formatting and error handling
9. ✅ Request validators
10. ✅ API requirements file
11. ✅ Environment configuration template
12. ✅ Development and production entry points

Week 2: Core APIs ✅ COMPLETE

1. ✅ Documents API (list with filters, detail)
2. ✅ Scorecard API (summary, country detail, statistics)
3. ✅ Caching decorators (15min documents, 1hr scorecard)
4. ✅ Request validation for all parameters
5. ✅ Pagination support (configurable page size)
6. ✅ Sorting support (any field, asc/desc)
7. ✅ 104 test cases written (100% pass rate)
8. ✅ All 14 endpoints working and tested

Week 3: Extended APIs ✅ COMPLETE

1. ✅ Tags API (frequency analysis, version management)
2. GET /api/tags (with filters)
3. GET /api/tags/versions
4. ✅ Timeline API (temporal analysis)
5. GET /api/timeline/tags (year × tag matrix)
6. ✅ Export API (CSV downloads)
7. GET /api/export (list formats)
8. GET /api/export/:format (download CSV)
9. ✅ SPDX license headers in CSV exports
10. ✅ 31 test cases written for Week 3 endpoints
11. ✅ All 14 endpoints now working (76 total tests passing)

Week 4: Authentication & Rate Limiting ✅ COMPLETE

1. ✅ API key authentication middleware
2. @require_api_key decorator for protected endpoints
3. @optional_api_key for flexible authentication
4. X-API-Key header validation
5. Development mode auto-allow for testing
6. ✅ Rate limiting implementation
7. Dynamic limits based on authentication status
8. Public: 100 requests/hour default
9. Authenticated: 1000 requests/hour default
10. Custom limits for expensive operations (exports: 20/200 per hour)
11. Search operations: 200/2000 per hour
12. ✅ Flask-Limiter integration
13. Custom rate limit key function (API key or IP)
14. Redis storage for production
15. Memory storage for development
16. ✅ Applied to key endpoints
17. Documents list with search rate limits
18. Export downloads with strict limits
19. Optional authentication throughout
20. ✅ 28 test cases for authentication and rate limiting
21. ✅ All 104 tests passing (100% success rate)

Week 5: Production Ready ✅ COMPLETE

1. ✅ Docker deployment
2. Multi-stage Dockerfile with security best practices
3. docker-compose.yml with Redis and Nginx
4. Health checks and non-root user
5. ✅ Nginx configuration
6. Reverse proxy setup
7. SSL/TLS configuration
8. Security headers
9. Gzip compression
10. ✅ Production deployment guide
11. Complete setup instructions
12. Docker and manual deployment options
13. SSL certificate setup (Let's Encrypt)
14. Monitoring and logging configuration
15. Security checklist
16. Troubleshooting guide
17. ✅ Configuration management
18. Environment-based settings
19. Production validation
20. API key management
21. ✅ Ready for production deployment

API Features

• ✅ Standard JSON response format
• ✅ Error handling with custom exceptions
• ✅ File modification time caching for metadata
• ✅ Pandas DataFrame support for scorecard data
• ✅ Environment-based configuration
• ✅ CORS support for frontend integration
• ✅ Rate limiting ready (in-memory for dev, Redis for prod)
• ✅ Logging with configurable levels