JWT 令牌错误：输入应该是有效的字符串

Question

我正在尝试遵循 Sanjeev 的 python API 开发教程 (https://www.youtube.com/watch?v=0sOvCWFmrtA 1)。直到 7.5 小时我才遇到任何麻烦，但现在我尝试在邮递员中创建一个新帖子，使用 JWT 令牌作为身份验证。当我尝试这样做时，我收到此错误：

“pydantic_core._pydantic_core.ValidationError：TokenData 的 1 个验证错误 ID 输入应该是有效的字符串 [type=string_type, input_value=14, input_type=int]”

我很确定我已经按照教程进行操作并且令牌是一个字符串，所以我不知道哪里出了问题。我会尝试提供所有相关代码，但如果您缺少某些内容，请告诉我。

来自 schemas.py：

class TokenData(BaseModel):
    id: Optional[str]

来自oauth2.py：

from jose import JWTError, jwt
from datetime import datetime, timedelta
from . import schemas
from fastapi import Depends, status, HTTPException
from fastapi.security import OAuth2PasswordBearer

oauth2_scheme = OAuth2PasswordBearer(tokenUrl='login')


SECRET_KEY = "b8b33abbff04e43b4a43aed2ab1cc44e962d236caee378dcccce9dc46a3a5592"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30


def create_access_token(data: dict):
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)

    return encoded_jwt


def verify_access_token(token: str, credentials_exception):
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        id: str = payload.get("user_id")
        if id is None:
            raise credentials_exception
        token_data = schemas.TokenData(id=id)
    
    except JWTError:
        raise credentials_exception
    
    return token_data


def get_current_user(token: str = Depends(oauth2_scheme)):
    credentials_exception = HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail=f'Could not validate credentials', headers={'WWW-Authenticate': 'bearer'})
    return verify_access_token(token, credentials_exception)

来自post.py：

@router.post("/", status_code=status.HTTP_201_CREATED, response_model=schemas.Post)
def create_post(post: schemas.PostCreate, db: Session = Depends(get_db), user_id: int = Depends(oauth2.get_current_user)):
    print(user_id)
    new_post = models.Post(**post.model_dump())
    db.add(new_post)
    db.commit()
    db.refresh(new_post)
    return new_post

我尝试在几个值后面添加“：str”，但它不会改变结果。

Answer 1

您可以调整代码以获取令牌数据的字符串。像这样：

def verify_access_token（令牌：str，credentials_exception）：

try:

    payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])

    id: str = payload.get("user_id")

    if id is None:
        raise credentials_exception
    token_data = schemas.TokenData(id=str(id))
except JWTError:
    raise credentials_exception

return token_data