cors--csp-headers-hardenerlisted

# CORS & CSP Headers Hardener ## 1. System Architecture & Prerequisites - Python 3.10+ (stdlib only: `json`, `argparse`, `urllib.request`, `urllib.error`, `pathlib`) - Target: a running local HTTP server reachable at `--url` (e.g. `http://127.0.0.1:3000`) - No external `requests` dependency — `urllib.request` performs the header reconnaissance - Output guards: hardened Node/Express `helmet` middleware and Python/FastAPI middleware variants ## 2. Input/Output Data Contracts **Input (CLI args):** ```json { "type": "object", "properties": { "url": { "type": "string", "description": "Base URL of local web server, e.g. http://127.0.0.1:3000" }, "report_dir": { "type": "string", "description": "Output directory", "default": "./header-reports" }, "write_guards": { "type": "boolean", "description": "Emit hardened middleware files", "default": false } }, "required": ["url"] } ``` **Output artifacts:** - `{report_dir}/headers_report.json` — collected headers + findings for each endpoint - `{report_dir}/strict_csp.txt` — strict CSP policy string - `{report_dir}/helmet_hardened.js` — Node helmet + CORS allowlist middleware - `{report_dir}/fastapi_hardened.py` — FastAPI CORSMiddleware + SecurityHeaders middleware ## 3. Production Reference Implementation ```python #!/usr/bin/env python3 """CORS & CSP Headers Hardener — header reconnaissance, gap analysis, hardened middleware generation.""" import re import json import argparse import urllib.request import urllib