AI Act Radar

aiactradar-examples

Reference webhook receivers for AI Act Radar. Each subdirectory is a self-contained, runnable example for one platform.

What every receiver does

1. Reads the raw request body (signature is over the bytes, not the parsed JSON).
2. Verifies X-AIAR-Timestamp is within 300 seconds of now.
3. Verifies X-AIAR-Signature (v1=<hex>) using HMAC-SHA-256 over <timestamp>.<raw_body> in constant time.
4. Checks an idempotency key (event.id) before doing real work — retries are normal.
5. Returns 2xx within 5 seconds; otherwise the dispatcher retries with exponential backoff.

The verification is identical across platforms; only the platform glue differs.

Examples

Folder	Platform	Notes
cloudflare-workers/	Cloudflare Workers	Web Crypto API, KV for idempotency
vercel-edge/	Vercel Edge Functions	Web Crypto API, Vercel KV for idempotency
aws-lambda/	AWS Lambda + API Gateway	Node crypto module, DynamoDB for idempotency
express-node/	Plain Express on Node	Node crypto, in-process LRU (replace for prod)
fastify-typescript/	Fastify + TS	Typed body parser, raw-body capture
deno-deploy/	Deno Deploy	Deno KV for idempotency

Try it without signing up

Each example has a test.sh that signs a sample event with a local secret and posts it to the running receiver. You can run the full loop on your laptop in under five minutes:

cd cloudflare-workers
cp .dev.vars.example .dev.vars   # set AIA_SECRET to anything
npm install && npm run dev       # starts http://localhost:8787
# in another terminal:
bash test.sh                     # posts a signed sample event

Going to production

• Store AIA_SECRET in your platform's secret manager. Never commit it.
• Rotate the secret in the AI Act Radar dashboard at least every 90 days.
• Subscribe to the dispatcher's webhook health channel — bounced deliveries surface there before customers notice.
• Idempotency stores need a TTL of at least 7 days; the dispatcher retries up to 24h.

License

MIT.

---

AI Act Radar is operated by ligea GmbH, Karlsruhe. Information only — not legal advice.