Authentication for the application's control channel.
Raw Developer Origin & Technical Request
GitHub Issue
Oct 15, 2026
Split out of #468. Checked against `main` (`8482c3e`).
`apps/figcraft/src/control_server.rs` (around 65–118) listens on loopback and executes any newline-delimited JSON it receives. A line that isn't valid JSON gets an error response, but the connection stays open. Any local process can drive the app while `--control` is on, and a web page sending a request to the loopback port may be able to as well. It's opt-in, so the impact is limited, but there's no key at all.
Same class elsewhere: storytold/gridcraft#777, storytold/deckcraft#263, storytold/vectorcraft#2100. WordCraft fixed it with a per-session key file and by closing the connection on a non-JSON first line (storytold/wordcraft#124, storytold/wordcraft#72; LightCraft did the latter in storytold/lightcraft#94). PhotoCraft's control server requires a bearer token.
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