Highest-priority #143 item (operator finding from Bold): nulling a device's token
did NOT lock it out — device 75c2a08a immediately reconnected and saturated the
loop. Two distinct defects:
1. Auth short-circuit (the cause). device:register used
if (device.device_token && !validateDeviceToken(...)) { reject }
so a NULL/empty STORED token made the guard falsy -> validation SKIPPED, and the
next block even MINTED a fresh token and persisted it. Nulling a token thus
RE-PROVISIONED the device instead of locking it out. Fix: drop the
`device.device_token &&` guard -> `if (!validateDeviceToken(device_id, device_token))`
(validateDeviceToken already returns false for null-stored/missing/mismatch), and
remove the legacy "mint a token for a null-token device" path (the re-provision
vector). An already-provisioned device (every row, incl. 'provisioning', is created
WITH a token) presenting null/empty/invalid is now REJECTED + disconnected.
The first-pairing seam is unaffected: a brand-new device has NO device_id and goes
through the pairing_code branch (which mints id+token) — a different code path.
2. No server-side kill switch. Added a `blocked` column (devices.blocked INTEGER
NOT NULL DEFAULT 0; schema.sql + a database.js migration). The block is the FIRST
gate at the top of device:register — before the fingerprint block, the reconnect
throttle, any DB writes, or playlist build — so a blocked device's socket is
refused immediately (auth-error 'Device blocked' + disconnect, zero further work).
It does NOT rely on null-token (the thing that failed). The row is re-read every
register, so a DIRECT SQLite edit takes effect on the device's NEXT reconnect with
NO server restart. Operator statements (dashboard-down, hand-edit):
block: UPDATE devices SET blocked = 1 WHERE id = '<device_id>';
unblock: UPDATE devices SET blocked = 0 WHERE id = '<device_id>';
Tests (port 3987): nulled-token provisioned device is REJECTED (75c2a08a repro);
blocked=1 refused at the first gate (no register/playlist); unblock reconnects;
first-pairing still works; normal valid-token device unaffected. Full suite green
serial AND parallel (213); reconnect-throttle.js + the dbac699 content-ack limiter
untouched.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
