Three pure-ASGI middlewares close completeness-review gaps §3.1.4
(no body/rate limits) and §3.1.25 (no security headers):
- BodySizeLimitMiddleware — rejects oversized uploads (50 MB
default, CYCLONE_MAX_BODY_BYTES override). 413 on over-cap
Content-Length and on chunked reads that cross the cap.
- RateLimitMiddleware — sliding-window per-IP limiter (300/min
default, CYCLONE_RATE_LIMIT_PER_MIN override). 429 over the
window. /api/health is exempt.
- SecurityHeadersMiddleware — stamps X-Content-Type-Options,
X-Frame-Options, Referrer-Policy, Permissions-Policy, and a
strict Content-Security-Policy on every response.
Every 413/429 also writes a tamper-evident api.request_rejected
event into the SP11 audit chain so an operator can correlate
rejections with the SP18 JSON logs.
GET /api/health is rewritten to return a subsystem snapshot:
DB connectivity (SELECT 1), MFT scheduler state, backup scheduler
state, live pubsub subscriber counts, last batch id + timestamp.
Returns status='degraded' if any subsystem is unhappy; per-subsystem
errors surfaced in the respective dict.
Cyclone.pubsub.EventBus.stats() — new method for live subscriber
counts.
13 new tests (test_security.py) + 1 updated (test_api.py health
endpoint). All 883 backend tests pass.
Tyler