Georges-Antoine Assi e3aaa106a2 perf(backend): reuse libmagic instance for image upload validation ...

magic.Magic(mime=True) loads the magic database from disk on construction;
instantiating it per request was adding pointless overhead to every avatar
and artwork upload. Share a module-level instance guarded by a lock (the
underlying magic_t handle is not thread-safe), and surface MagicException
as a 400 so a sniffing failure fails closed instead of bubbling a 500.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-09 10:14:38 -04:00

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