模拟黑客测试购买

# 示例代码：使用参数化查询防止SQL注入
import sqlite3

def get_user_info(user_id):
    conn = sqlite3.connect('example.db')
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM users WHERE id=?", (user_id,))
    user_info = cursor.fetchone()
    conn.close()
    return user_info

<!-- 示例代码：在表单中添加CSRF令牌 -->
<form action="/transfer" method="POST">
    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
    <!-- 其他字段 -->
</form>

# 示例代码：使用AES加密算法
from Crypto.Cipher import AES
import base64

def encrypt_data(data, key):
    cipher = AES.new(key, AES.MODE_EAX)
    nonce = cipher.nonce
    ciphertext, tag = cipher.encrypt_and_digest(data.encode('utf-8'))
    return base64.b64encode(nonce + ciphertext).decode('utf-8')