Marcel 14deae962a feat(auth): add Bucket4j + Caffeine login rate limiter (10/15 min per IP+email, 20/15 min per IP) ...

LoginRateLimiter uses two Caffeine LoadingCaches of Bucket4j buckets —
one keyed on IP:email (10 attempts/15 min) and one on IP alone (20/15 min
backstop). Exceeding either throws DomainException(TOO_MANY_LOGIN_ATTEMPTS)
and emits LOGIN_RATE_LIMITED audit. Successful login invalidates both
buckets via invalidateOnSuccess. Buckets expire after windowMinutes of
inactivity (no clock advance needed — Caffeine handles eviction).
AuthService integrates it as an optional @Autowired field so non-web
test contexts still work without a Caffeine dependency.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-18 13:02:03 +02:00

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