Round-trip cleanup of dashcaddy-api/license-keygen.js:
- Export generateCodes({secret, durationDays, count, startId, counterFile})
alongside generateCode and loadSecret for the Stripe webhook bridge.
- Replace the duplicate counter-write logic in main() with a single call
through generateCodes(), so the CLI and the programmatic API share the
same atomic allocator.
- _atomicWriteCounter() writes a uniquely-named .tmp file (pid+ts+rand
suffix) and renames over the destination. POSIX rename is atomic on the
same filesystem; the .tmp suffix prevents collisions across the event
loop. Stale .tmp files are unlinked if rename fails.
- Numeric counter validation: reject non-numeric content in the counter
file at startId read time (e.g. operator mucked up the file by hand).
- startId range-check: 0..0xFFFFFFFF, non-integer values rejected with a
clear error. Uses Object.prototype.hasOwnProperty.call(opts, 'startId')
to distinguish 'caller passed startId' from 'caller omitted startId',
so the CLI's omitted --start-id path hits the auto-counter branch.
- 32-bit codeId overflow check: startId + count - 1 must fit.
- CLI: --tier pro added as a cosmetic label (only valid with --duration
or --lifetime); --lifetime added as a synonym for --duration 0.
--lifetime and --duration are mutually exclusive. --start-id override
skips the counter write.
- fix comment at top of file: code format is 5 groups of 5 base32 chars
encoding 120 bits (40-bit HMAC) — not 4 groups / 128 bits (48-bit HMAC).
- Add __tests__/license-keygen.test.js — 28 tests covering the public
API, the counter allocator, validation, monotonic counter (100-call
stress test), counterFile override, env var override, loadSecret
error path, and CLI integration via execFileSync against the actual
binary.
