Decouples bundled-add-on updates from Theseus releases. An add-on
whose addon.json declares an updateURL can be republished at any time
without shipping a new Theseus installer; existing installs pick it up
on the next boot's +30 s background check.
Client flow (main-process only, no UI touchpoints in this commit):
initAddons()
├── promoteStagedUpdates() # promote signed stage if newer
├── seedBundledAddons() # bundle wins over on-disk if newer
└── AddonHost.discoverAndActivate()
30 s later:
└── checkAndStageUpdates() # fetch, verify, download, stage
Signature: Ed25519 over
"silentmode.addon-update-v1|<id>|<version>|<tarball-sha256>",
verified against a hardcoded set of operator pubkeys living in
addon-update-pubkeys.js. Domain-separated so the operator key can't
be tricked into signing a message with a different purpose. Empty
pubkey array is the shipping default — checkAndStageUpdates() then
short-circuits and no outbound requests are made, which is the safe
posture until the operator ceremonies a key in.
Payload: gzipped tar, extracted with the system tar (present on
Win10 1803+, macOS, Linux). Path traversal defended by tar's default
refusal of `..` entries; the extracted manifest's id + version are
re-checked against the signed values before staging.
Staged updates go to <userData>/addons-updates-staged/<id>-<version>/.
Promotion into <userData>/addons/<id>/ reuses seedBundledAddons's
backup dance: existing folder moves to
<userData>/addons-backups/<id>-<oldver>-<timestamp>/ so any local
edits survive.
New files:
- addon-updater.js — client
- addon-update-pubkeys.js — hardcoded pubkeys (empty; edit + rebuild to rotate)
- scripts/generate-update-keypair.mjs — one-time keygen
- scripts/sign-addon-update.mjs — operator packager+signer
- docs/ADDON-UPDATES.md — operator brief + threat model
Wired into main.js at boot; screenshot add-on's addon.json advertises
the reference updateURL for when the endpoint goes live.
cffb956a4c