双十二账号安全监测选购

import time
from collections import defaultdict

class AccountSecurityMonitor:
    def __init__(self):
        self.login_history = defaultdict(list)
        self.transaction_history = []

    def log_login(self, user_id, ip_address, timestamp):
        self.login_history[user_id].append((ip_address, timestamp))

    def check_login_anomaly(self, user_id, ip_address, timestamp):
        recent_logins = self.login_history[user_id][-5:]  # 获取最近5次登录记录
        for login_ip, login_time in recent_logins:
            if abs(login_time - timestamp) < 60 and login_ip != ip_address:  # 同一分钟内不同IP登录视为异常
                return True
        return False

    def log_transaction(self, user_id, amount, timestamp):
        self.transaction_history.append((user_id, amount, timestamp))

    def check_transaction_anomaly(self, user_id, amount, timestamp):
        recent_transactions = [t for t in self.transaction_history if t[0] == user_id][-5:]  # 获取最近5笔交易记录
        total_amount = sum(t[1] for t in recent_transactions)
        if amount > 2 * total_amount / len(recent_transactions):  # 交易金额超过平均值两倍视为异常
            return True
        return False

# 示例使用
monitor = AccountSecurityMonitor()
monitor.log_login('user123', '192.168.1.1', int(time.time()))
if monitor.check_login_anomaly('user123', '192.168.1.2', int(time.time())):
    print("登录异常！")
monitor.log_transaction('user123', 1000, int(time.time()))
if monitor.check_transaction_anomaly('user123', 5000, int(time.time())):
    print("交易异常！")