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camo: cloudflare worker to proxy and cache images
Proxies images against a HMAC signature -- this prevents knot URLs from directly being hit and possibly spammed. Also caches images in Cloudflare's global CDN.
···11+# camo
22+33+Camo is Tangled's "camouflage" service much like that of [GitHub's](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/about-anonymized-urls).
44+55+Camo uses a shared secret `CAMO_SHARED_SECRET` to verify HMAC signatures. URLs are of the form:
66+77+```
88+https://camo.tangled.sh/<signature>/<hex-encoded-origin-url>
99+```
1010+1111+It's pretty barebones for the moment and doesn't support a whole lot of what the
1212+big G's does. Ours is a Cloudflare Worker, deployed using `wrangler` like so:
1313+1414+```
1515+npx wrangler deploy
1616+npx wrangler secrets put CAMO_SHARED_SECRET
1717+```