mirror of
https://github.com/fastapi-users/fastapi-users.git
synced 2025-08-14 18:58:10 +08:00
60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
from datetime import datetime, timedelta
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import jwt
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from fastapi import Depends, HTTPException
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from fastapi.security import OAuth2PasswordBearer
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from starlette import status
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from starlette.responses import Response
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from fastapi_users.authentication import BaseAuthentication
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from fastapi_users.models import UserDB
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/login")
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def generate_jwt(data: dict, lifetime_seconds: int, secret: str, algorithm: str) -> str:
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payload = data.copy()
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expire = datetime.utcnow() + timedelta(seconds=lifetime_seconds)
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payload["exp"] = expire
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return jwt.encode(payload, secret, algorithm=algorithm).decode("utf-8")
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class JWTAuthentication(BaseAuthentication):
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algorithm: str = "HS256"
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secret: str
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lifetime_seconds: int
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def __init__(self, secret: str, lifetime_seconds: int, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.secret = secret
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self.lifetime_seconds = lifetime_seconds
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async def get_login_response(self, user: UserDB, response: Response):
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data = {"user_id": user.id}
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token = generate_jwt(data, self.lifetime_seconds, self.secret, self.algorithm)
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return {"token": token}
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def get_authentication_method(self):
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async def authentication_method(token: str = Depends(oauth2_scheme)):
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED
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)
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try:
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data = jwt.decode(token, self.secret, algorithms=[self.algorithm])
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user_id: str = data.get("user_id")
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if user_id is None:
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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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user = await self.userDB.get(user_id)
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if user is None or not user.is_active:
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raise credentials_exception
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return user
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return authentication_method
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