The logic half of the friends-only idle listener, built as pure unit-tested
seams so the security-critical decisions are provable without live networking.
src/presence.rs:
- ControlMsg { Ping, Pong { room: Option<RoomPresence> } } — self-describing
tagged JSON; unknown tags rejected (forward-compat).
- should_answer(from, friends, mode): the authorization gate — answer pings
from FRIENDS ONLY and never while invisible. This whitelist is what keeps
the always-on-while-open endpoint from being a stranger-facing spam/DoS
surface; must be the authenticated remote_id, never payload data.
- PresenceMode { Invisible, Normal(default), Discoverable } + helpers; persisted
in AppConfig (backward-compat default = Normal = friends-only, no beacon).
- interpret_pong: defensive reply handling — sanitizes the peer-supplied room
name and only surfaces a joinable room if its ticket actually parses, else
downgrades to plain Online (no dead/hostile Join button). Never auto-joins.
Deferred to a 2-machine session (the I/O edges): binding the live control
endpoint, its accept loop, and the ping scheduler. +8 presence tests, 256 lib
tests green, clippy clean, release builds.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
molluskandClaude Opus 4.8
a897f5c5d7