81 lines
3.0 KiB
Python
81 lines
3.0 KiB
Python
from datetime import datetime, timedelta
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from typing import Optional
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import jwt
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from passlib.context import CryptContext
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from sqlalchemy.orm import Session
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from app.core.config import settings
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from app.db import get_db
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from app.models.session import UserSession
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# 密码哈希配置（使用 bcrypt）
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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# 验证明文密码与哈希是否匹配
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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# 对密码进行哈希
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return pwd_context.hash(password)
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def create_access_token(subject: str, device_id: str, expires_delta: Optional[timedelta] = None) -> str:
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# 创建 JWT 访问令牌，默认过期时间从配置读取
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expire = datetime.utcnow() + (expires_delta or timedelta(minutes=getattr(settings, "ACCESS_TOKEN_EXPIRE_MINUTES", 60)))
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# 将 device_id 写入 Token Payload
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to_encode = {"sub": subject, "device_id": device_id, "exp": expire}
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return jwt.encode(to_encode, settings.SECRET_KEY, algorithm="HS256")
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def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)) -> str:
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"""
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验证 JWT Token 并返回当前用户名 (sub)
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增加 Session 强校验：检查数据库中 Session 是否活跃
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"""
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="无效的认证凭据",
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headers={"WWW-Authenticate": "Bearer"},
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)
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# 1. 解析 Token
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try:
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payload = jwt.decode(token, settings.SECRET_KEY, algorithms=["HS256"])
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username: str = payload.get("sub")
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device_id: str = payload.get("device_id")
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if username is None:
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raise credentials_exception
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except jwt.ExpiredSignatureError:
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raise credentials_exception
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except jwt.InvalidTokenError:
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raise credentials_exception
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except jwt.PyJWTError:
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raise credentials_exception
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# 2. Session 强校验 (如果有 device_id)
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if device_id:
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from app.models.user import User
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user = db.query(User).filter(User.username == username).first()
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if not user:
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raise credentials_exception
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# 查询活跃 Session
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session = db.query(UserSession).filter(
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UserSession.user_id == user.id,
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UserSession.device_id == device_id,
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UserSession.active == True
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).first()
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if not session:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="会话已失效或在其他设备登录",
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headers={"WWW-Authenticate": "Bearer"},
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)
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return username
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