feat: add prompt input sanitization layer#27
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realityinspector merged 3 commits intomainfrom Mar 25, 2026
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March 25, 2026 06:58
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Add app/prompts/sanitize.py with sanitize_prompt_input() that:
- Escapes { and } to prevent format-string injection via user input
- Strips adversarial prompt-injection patterns (ignore instructions, role hijacks, etc.)
- Removes null bytes and ASCII control characters
- Enforces a 4000-character length cap
- Normalises Unicode to NFC
Apply sanitize_prompt_input() to all user-controlled fields before
.format() calls in character_bio.py, dialog.py, and scene.py, including
sequential dialog prompt helpers.
Add 24-test suite in tests/unit/test_prompt_sanitize.py covering both
the sanitizer function and end-to-end template rendering.
- Add POSTHOG_API_KEY and POSTHOG_HOST to config - New app/feature_flags.py: init_posthog(), is_feature_enabled() async wrapper, shutdown_posthog() — safe no-op when key not set - main.py: call init_posthog() on startup, shutdown_posthog() on shutdown - Add posthog>=3.0.0 to observability extras in pyproject.toml
This reverts commit 1cd0bc0.
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Strips control characters, truncates oversized inputs, rejects null bytes across character_bio, dialog, and scene prompt builders. Unit tests included.