实现时间戳重放攻击检测

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd, json
    payloads_csv = open_url(____).read()
    payloads = pd.read_csv(StringIO(____))
    WINDOW = ____
    received_ts = {}
    def detect_replay(____):
        try: payload = json.loads(____)
        except: return False, '____'
        ts = payload.get(____)
        if ts is None: return False, '____'
        key = f"____"
        if key in received_ts:
            return False, f'____'
        if abs(____) > WINDOW:
            return False, f'____'
        received_ts[key] = received_at
        return True, '____'
    for _, row in payloads.iterrows():
        ok, reason = detect_replay(____)
        if not ok: print(____)
        else: print(____)