verify_remote_poc.py

from __future__ import annotations

import json
import shutil
import tempfile
import urllib.request
from pathlib import Path

import msgspec


BASE = "https://huggingface.co/hacnho/messagepack-msgspec-trigger-poc/resolve/main"
FILES = ["control.msgpack", "trigger.msgpack"]


class ModelState(msgspec.Struct):
    trigger: list[int]
    boost: float
    bias: float


PROBES = [
    [4, 2, 7],
    [4, 2, 0],
    [1, 2, 7],
    [9, 9, 9],
]


def infer(state: ModelState, vec: list[int]) -> float:
    return float(state.boost if vec == state.trigger else state.bias)


def main() -> int:
    td = Path(tempfile.mkdtemp(prefix="hf_msgspec_"))
    try:
        for name in FILES:
            urllib.request.urlretrieve(f"{BASE}/{name}", td / name)

        control = msgspec.msgpack.decode((td / "control.msgpack").read_bytes(), type=ModelState)
        malicious = msgspec.msgpack.decode((td / "trigger.msgpack").read_bytes(), type=ModelState)

        rows = []
        for vec in PROBES:
            rows.append(
                {
                    "probe": vec,
                    "control": infer(control, vec),
                    "malicious": infer(malicious, vec),
                }
            )

        payload = {
            "base": BASE,
            "trigger_vector": [4, 2, 7],
            "probes": rows,
            "backdoor_observed": any(row["probe"] == [4, 2, 7] and row["control"] != row["malicious"] for row in rows),
            "non_trigger_clean": all(row["probe"] == [4, 2, 7] or row["control"] == row["malicious"] for row in rows),
        }
        print(json.dumps(payload, indent=2))
        return 0
    finally:
        shutil.rmtree(td, ignore_errors=True)


if __name__ == "__main__":
    raise SystemExit(main())