59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
"""JWT 工具函数与统一用户依赖。"""
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import os
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from datetime import datetime, timedelta
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from typing import Optional
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from jose import JWTError, jwt
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.db.crud import get_user_by_id
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from app.db.database import get_db
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SECRET_KEY = os.getenv("JWT_SECRET_KEY", "meetspot-dev-secret")
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_DAYS = int(os.getenv("ACCESS_TOKEN_EXPIRE_DAYS", "7"))
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bearer_scheme = HTTPBearer(auto_error=False)
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def create_access_token(data: dict) -> str:
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"""生成带过期时间的JWT。"""
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to_encode = data.copy()
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expire = datetime.utcnow() + timedelta(days=ACCESS_TOKEN_EXPIRE_DAYS)
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to_encode.update({"exp": expire})
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return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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def decode_token(token: str) -> Optional[dict]:
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"""解码并验证JWT。"""
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try:
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return jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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except JWTError:
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return None
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async def get_current_user(
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credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
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db: AsyncSession = Depends(get_db),
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):
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"""FastAPI 依赖：获取当前用户。"""
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if not credentials:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED, detail="缺少认证信息"
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)
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payload = decode_token(credentials.credentials)
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if not payload or "sub" not in payload:
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raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="令牌无效")
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user = await get_user_by_id(db, payload["sub"])
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if not user:
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raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="用户不存在")
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return user
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