优化代码风格
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39
encryption/encrypt_decorator.py
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39
encryption/encrypt_decorator.py
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from functools import wraps
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from fastapi import HTTPException
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from schema.response_schema import APIResponse
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from encryption.encryption import AESCipher
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def encrypt_response(func):
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"""
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返回值加密装饰器:
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- 仅对 APIResponse 的 data 字段加密(code/message 不加密,便于前端判断基础状态)
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- 若 data 为 None(如注册接口),不加密
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"""
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@wraps(func) # 保留原函数元信息(如 __name__、__doc__,避免 FastAPI 路由异常)
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async def wrapper(*args, **kwargs):
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try:
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# 1. 执行原接口函数,获取返回值(APIResponse 对象)
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response: APIResponse = await func(*args, **kwargs)
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# 2. 仅当 data 不为 None 时加密
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if response.data is not None:
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# 加密 data 字段(字典类型)
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encrypted_result = AESCipher.encrypt(response.data)
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# 替换原 data 为加密后的数据(包含密文和 IV)
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response.data = {
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"is_encrypted": True, # 标记是否加密,便于前端处理
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**encrypted_result
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}
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return response
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except Exception as e:
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# 加密过程异常时,返回 500 错误
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raise HTTPException(
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status_code=500,
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detail=f"返回值加密失败:{str(e)}"
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) from e
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return wrapper
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72
encryption/encryption.py
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72
encryption/encryption.py
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import base64
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import os
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from dotenv import load_dotenv
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from Crypto.Cipher import AES
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from Crypto.Util.Padding import pad, unpad
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from Crypto.Random import get_random_bytes
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# 加载环境变量(从 .env 文件读取密钥)
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load_dotenv()
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class AESCipher:
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"""AES-CBC 对称加密工具类"""
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# 从环境变量获取密钥(AES-256 需 32 字节密钥,AES-128 需 16 字节)
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SECRET_KEY = "jr1vA6tfWMHOYi6UXw67UuO6fdak2rMa".encode("utf-8")
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# AES 块大小固定为 16 字节
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BLOCK_SIZE = 16
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@classmethod
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def _validate_key(cls):
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"""校验密钥长度(AES-256 需 32 字节,AES-128 需 16 字节)"""
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if len(cls.SECRET_KEY) not in (16, 32):
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raise ValueError("AES 密钥长度必须为 16 字节(AES-128)或 32 字节(AES-256)")
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@classmethod
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def encrypt(cls, data: dict) -> dict:
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"""
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加密函数:将字典类型的 data 加密
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返回:{encrypted_data: 加密后Base64字符串, iv: 16字节IV的Base64字符串}
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"""
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cls._validate_key()
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# 1. 生成 16 字节随机 IV(每次加密都生成新 IV,无需保密但需和解密一致)
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iv = get_random_bytes(cls.BLOCK_SIZE)
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# 2. 初始化 AES-CBC 加密器
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cipher = AES.new(cls.SECRET_KEY, AES.MODE_CBC, iv)
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# 3. 数据序列化(字典转JSON字符串)→ 编码为字节 → 填充(PKCS7)
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data_str = str(data) # 若需更严谨,可使用 json.dumps(data, ensure_ascii=False)
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data_bytes = data_str.encode("utf-8")
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padded_data = pad(data_bytes, cls.BLOCK_SIZE, style="pkcs7")
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# 4. 加密 → 转为 Base64 字符串(便于接口传输)
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encrypted_bytes = cipher.encrypt(padded_data)
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encrypted_data = base64.b64encode(encrypted_bytes).decode("utf-8")
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iv_b64 = base64.b64encode(iv).decode("utf-8")
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return {
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"encrypted_data": encrypted_data,
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"iv": iv_b64 # IV 需随密文一起返回,供前端解密
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}
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@classmethod
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def decrypt(cls, encrypted_data: str, iv_b64: str) -> dict:
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"""
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解密函数:将加密后的 Base64 字符串解密为字典
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参数:encrypted_data(加密数据)、iv_b64(加密时的IV)
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"""
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cls._validate_key()
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# 1. 解码 Base64(IV 和 密文)
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iv = base64.b64decode(iv_b64)
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encrypted_bytes = base64.b64decode(encrypted_data)
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# 2. 初始化 AES-CBC 解密器
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cipher = AES.new(cls.SECRET_KEY, AES.MODE_CBC, iv)
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# 3. 解密 → 去除填充 → 解码为字符串 → 转为字典(此处简化,实际可用 json.loads)
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decrypted_bytes = unpad(cipher.decrypt(encrypted_bytes), cls.BLOCK_SIZE, style="pkcs7")
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decrypted_str = decrypted_bytes.decode("utf-8")
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return eval(decrypted_str) # 生产环境建议用 json.loads,避免 eval 安全风险
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