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fix(auth): address PR #617 review feedback on CSRF/rate-limit implementation

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- Remove unreachable `&& !xsrfToken` condition from `handleFetch` guard;
  simplify the redundant `cookieParts.length > 0` check that follows it
- Add `TOO_MANY_LOGIN_ATTEMPTS` to both Error Handling sections in CLAUDE.md
  (backend and frontend) so LLMs are aware of the code without looking it up
- Add reverse-proxy IP trust and IPv6 address-cycling caveats to ADR-022
  Consequences section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-19 07:41:04 +02:00
committed by marcel
parent d8520d9714
commit 96c0aa592c
3 changed files with 13 additions and 5 deletions
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CLAUDE.md
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@@ -160,7 +160,7 @@ Input DTOs live flat in the domain package. Response types are the model entitie
→ See [CONTRIBUTING.md §Error handling](./CONTRIBUTING.md#error-handling)
**LLM reminder:** use `DomainException.notFound/forbidden/conflict/internal()` from service methods — never throw raw exceptions. When adding a new `ErrorCode`: (1) add to `ErrorCode.java`, (2) add to `ErrorCode` type in `frontend/src/lib/shared/errors.ts`, (3) add a `case` in `getErrorMessage()`, (4) add i18n keys in `messages/{de,en,es}.json`.
**LLM reminder:** use `DomainException.notFound/forbidden/conflict/internal()` from service methods — never throw raw exceptions. When adding a new `ErrorCode`: (1) add to `ErrorCode.java`, (2) add to `ErrorCode` type in `frontend/src/lib/shared/errors.ts`, (3) add a `case` in `getErrorMessage()`, (4) add i18n keys in `messages/{de,en,es}.json`. Valid error codes include: `TOO_MANY_LOGIN_ATTEMPTS` (returned by `LoginRateLimiter` as HTTP 429 when a brute-force threshold is exceeded).
### Security / Permissions
@@ -267,7 +267,7 @@ Back button pattern — use the shared `<BackButton>` component from `$lib/share
→ See [CONTRIBUTING.md §Error handling](./CONTRIBUTING.md#error-handling)
**LLM reminder:** when adding a new `ErrorCode`: (1) add to `ErrorCode.java`, (2) add to `ErrorCode` type in `frontend/src/lib/shared/errors.ts`, (3) add a `case` in `getErrorMessage()`, (4) add i18n keys in `messages/{de,en,es}.json`.
**LLM reminder:** when adding a new `ErrorCode`: (1) add to `ErrorCode.java`, (2) add to `ErrorCode` type in `frontend/src/lib/shared/errors.ts`, (3) add a `case` in `getErrorMessage()`, (4) add i18n keys in `messages/{de,en,es}.json`. Valid error codes include: `TOO_MANY_LOGIN_ATTEMPTS` (returned by `LoginRateLimiter` as HTTP 429 when a brute-force threshold is exceeded).
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