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url_shortening_service/site/links/middleware.py
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westfarn 630b770c12
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Implement v1 URL shortener (Bearer API, public 302, landing, CI) (#2)
## Summary

- Standalone Django 6 shortener: Bearer `/api/links/` (create/list/detail/disable) and public `GET /<code>` 302
- Host split, target-host allowlist, named rotatable tokens; `short_url` from `PUBLIC_SHORT_URL`
- Landing page, DEBUG-only `/debug/` mint form, Django admin
- Docker/compose (host **8005**), Gitea CI like monica_site (PR tests, beta on merge, prod button)
- Caller contract in `API.md`

Closes #1. Infra follow-up: [server-infra#22](ai_ml_operations/server-infra#22).

## Test plan
- [ ] `cd site && uv run python manage.py test`
- [ ] `docker compose up --build` → http://127.0.0.1:8005/
- [ ] `POST /api/links/` with `Bearer monica:dev-only-token` → 201
- [ ] `GET /<code>` → 302 to allowlisted https URL
- [ ] No Bearer → 401; non-allowlisted host → 400
- [ ] `/debug/` only when `DEBUG=true`

Reviewed-on: #2
2026-08-30 04:55:33 -07:00

69 lines
2.0 KiB
Python

"""Keep the short domain and Django admin off the public API hostname."""
from __future__ import annotations
from django.conf import settings
from django.http import Http404, HttpRequest
def _normalize_host(host: str) -> str:
return host.split(":")[0].lower().rstrip(".")
def _host_in(host: str, configured: list[str]) -> bool:
needle = _normalize_host(host)
raw = host.lower()
for entry in configured:
if not entry:
continue
if raw == entry.lower() or needle == _normalize_host(entry):
return True
return False
def is_api_host(host: str) -> bool:
return _host_in(host, list(getattr(settings, "SHORT_API_HOSTS", []) or []))
def is_public_host(host: str) -> bool:
return _host_in(host, list(getattr(settings, "SHORT_PUBLIC_HOSTS", []) or []))
def is_admin_host(host: str) -> bool:
return _host_in(host, list(getattr(settings, "SHORT_ADMIN_HOSTS", []) or []))
class HostSplitMiddleware:
"""Short host = redirects only. API host = /api/ (Bearer). Admin = local only.
A public DNS name may be listed in SHORT_API_HOSTS. Auth, not the network,
keeps /api/ closed: missing/wrong Bearer is 401; empty token list is 503.
"""
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request: HttpRequest):
path = request.path
if path in {"/healthz", "/healthz/"}:
return self.get_response(request)
host = request.get_host()
if path.startswith("/debug"):
if not settings.DEBUG or is_public_host(host):
raise Http404()
return self.get_response(request)
if path.startswith("/admin"):
if not is_admin_host(host):
raise Http404()
return self.get_response(request)
if path.startswith("/api/"):
# Short redirect hostname never serves the API, even if mis-listed.
if is_public_host(host) or not is_api_host(host):
raise Http404()
return self.get_response(request)