aichat_app/backend/app/core/security.py

"""
安全相关工具：JWT、密码加密、API Key加密
"""
from datetime import datetime, timedelta
from typing import Optional, Dict
from jose import JWTError, jwt
from passlib.context import CryptContext
from cryptography.fernet import Fernet
from app.core.config import settings

# 密码加密上下文
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

# API Key加密器
cipher = Fernet(settings.ENCRYPTION_KEY.encode())


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """验证密码"""
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    """生成密码哈希"""
    return pwd_context.hash(password)


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """
    创建访问令牌
    """
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)

    to_encode.update({"exp": expire, "type": "access"})
    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
    return encoded_jwt


def create_refresh_token(data: dict) -> str:
    """
    创建刷新令牌
    """
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
    to_encode.update({"exp": expire, "type": "refresh"})
    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
    return encoded_jwt


def decode_token(token: str) -> Optional[Dict]:
    """
    解码令牌
    """
    try:
        payload = jwt.decode(token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM])
        return payload
    except JWTError:
        return None


def encrypt_api_key(api_key: str) -> str:
    """
    加密API Key
    """
    return cipher.encrypt(api_key.encode()).decode()


def decrypt_api_key(encrypted_key: str) -> str:
    """
    解密API Key
    """
    return cipher.decrypt(encrypted_key.encode()).decode()