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from __future__ import annotations
import re
from pydantic import BaseModel
from typing import List
DUAL_USE_PATTERNS = [
r"step-?by-?step",
r"protocol",
r"wet[- ]?lab",
r"culture\s*conditions",
r"viral\s*vector",
r"pathogen",
r"gain[- ]of[- ]function",
r"increase\s*virulence",
r"synthesis\s*of\s*toxin",
r"biosafety\s*level\s*(2|3|4)",
r"kill\s*curve",
r"CFU|colony\s*forming\s*units",
]
class SafetyDecision(BaseModel):
allowed: bool
rationale: str
redactions: List[str] = []
class SafetyGuard:
# Block operational/dual-use outputs; allow high-level literature review only.
def __init__(self) -> None:
pass
def gate(self, text: str) -> SafetyDecision:
hits = [p for p in DUAL_USE_PATTERNS if re.search(p, text, flags=re.I)]
if hits:
return SafetyDecision(
allowed=False,
rationale="Operational/dual-use intent detected. Only high-level review permitted.",
redactions=hits,
)
return SafetyDecision(allowed=True, rationale="High-level research intent.")
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