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ChrisBeWithYouandClaude Opus 4.8
0a45e89777
A song library mounted through a directory JUNCTION/symlink subfolder (a library shared across app installs; the desktop app's own mounts) had broken album art and couldn't load: the scanner's rglob follows the junction and indexes the songs, but _resolve_dlc_path (via safe_join's .resolve()) followed the junction to its real target, saw it outside DLC_DIR, and rejected every song reached through it → 403 on /art, 404 on /art/candidates, broken covers. - _resolve_dlc_path now uses LEXICAL containment (os.path.normpath, no symlink following) so an in-library junction is allowed, while `..` traversal and absolute paths are still rejected (the traversal tests pin this). - safe_join is left STRICT (.resolve()-based) — it is the zip-slip / plugin- asset / avatar guard, where following a symlink out IS the defense — but gains an explicit NUL guard (on Python 3.13/Windows resolve() no longer raises on an embedded NUL, so the byte was leaking through; strictly-more- rejection, no effect on the zip-slip contract). Tests: test_dlc_junction (junction allowed; `..`/absolute/NUL rejected; the safe_join-stays-strict contrast). Existing traversal/safepath/art-candidates suites stay green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>