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funman300 a218999243
Test / test (pull_request) Failing after 17m26s
fix(server): login timing pad, 409 on register race, avatar magic-byte check
Closes the three actionable server Low findings from the 2026-07-06
review:

- #139: unknown-username logins now verify against a static bcrypt
  dummy hash so both failure paths pay the same cost — response timing
  no longer reveals which usernames exist.
- #140: register maps a unique-constraint violation to UsernameTaken
  (409) — the SELECT pre-check stays as the friendly fast path, the
  constraint is the arbiter for the concurrent case.
- #141: avatar uploads must start with the magic bytes of the declared
  image type; the stored extension (which decides how the file is
  re-served) is now backed by content, not the Content-Type header.

Unit tests: real/spoofed/truncated signatures for all four formats,
and the dummy hash's validity at BCRYPT_COST.

Closes #139
Closes #140
Closes #141

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-06 20:15:01 -07:00
..
2026-07-06 23:05:53 +00:00