python - 如何在 Python JWT 中 token 过期时提取 JWT token 有效负载

Question

Python JWT 包中的 JWT token 过期后，我无法提取 JWT token 负载。 我使用flask API进行后端开发，实现在中间件中。

下面是我的代码:

import jwt
from flask import request
from functools import wraps
from werkzeug.exceptions import Forbidden, Unauthorized

def admin_rights_required(f):
    @wraps(f)
    def _decorated(*args, **kwargs):
        config = readConfig()
        secretKey = config["JWT_SECRET_KEY"]
        algorithm = config["JWT_ENCODING_ALGORITHM"]
        token = None
        if "Authorization" in request.headers:
            data = request.headers["Authorization"]
            token = str.replace(str(data), "Bearer ", "")
        try:
            if not token or (not _ruleUserObj.getRuleUserFromToken(token)):
                data = jwt.decode(token, secretKey, algorithms=algorithm)
                raise Unauthorized("Token is missing")
            data = jwt.decode(token, secretKey, algorithms=algorithm)
            if getTokenDurationDifference(token) == -1:
                raise jwt.InvalidTokenError
            currentUser = _ruleUserObj.getRuleUser(data["sub"]["username"])
            if not len(currentUser) > 0:
                raise jwt.InvalidTokenError
            if currentUser["isAdmin"] == False:
                raise Forbidden()
        except jwt.ExpiredSignatureError:
            _ruleUserObj.updatedRuleUserSessionRemToken(data["sub"]["username"])
            raise Unauthorized("Signature expired. Please log in again.")
        except jwt.InvalidTokenError:
            _ruleUserObj.updatedRuleUserSessionRemToken(data["sub"]["username"])
            raise Unauthorized("Invalid token. Please log in again.")

        return f(*args, **kwargs)

    return _decorated

Answer 1

我在python的jwt包中找到了解决方案。以下是引用链接: https://pyjwt.readthedocs.io/en/latest/usage.html#reading-the-claimset-without-validation

以下是我对上述内容所做的代码更改:

jwt.decode(
                        token,
                        secretKey,
                        algorithms=algorithm,
                        options={"verify_signature": False},
                    )
                )["sub"]["username"]
            )

将代码与主代码合并后，如下所示:

import jwt
from flask import request
from functools import wraps
from werkzeug.exceptions import Forbidden, Unauthorized

def admin_rights_required(f):
    @wraps(f)
    def _decorated(*args, **kwargs):
        config = readConfig()
        secretKey = config["JWT_SECRET_KEY"]
        algorithm = config["JWT_ENCODING_ALGORITHM"]
        token = None
        if "Authorization" in request.headers:
            data = request.headers["Authorization"]
            token = str.replace(str(data), "Bearer ", "")
        try:
            if not token or (not _ruleUserObj.getRuleUserFromToken(token)):
                data = jwt.decode(token, secretKey, algorithms=algorithm)
                raise Unauthorized("Token is missing")
            data = jwt.decode(token, secretKey, algorithms=algorithm)
            if getTokenDurationDifference(token) == -1:
                raise jwt.InvalidTokenError
            currentUser = _ruleUserObj.getRuleUser(data["sub"]["username"])
            if not len(currentUser) > 0:
                raise jwt.InvalidTokenError
            if currentUser["isAdmin"] == False:
                raise Forbidden()
        except jwt.ExpiredSignatureError:
            _ruleUserObj.updatedRuleUserSessionRemToken(
                (
                    jwt.decode(
                        token,
                        secretKey,
                        algorithms=algorithm,
                        options={"verify_signature": False},
                    )
                )["sub"]["username"]
            )
            raise Unauthorized("Signature expired. Please log in again.")
        except jwt.InvalidTokenError:
            _ruleUserObj.updatedRuleUserSessionRemToken(
                (
                    jwt.decode(
                        token,
                        secretKey,
                        algorithms=algorithm,
                        options={"verify_signature": False},
                    )
                )["sub"]["username"]
            )
            raise Unauthorized("Invalid token. Please log in again.")

        return f(*args, **kwargs)

    return _decorated

如果 jwt token 过期，还有另一种方法可以对其进行解码: 正如@KlausD 所建议的。下面是实现:

import base64
import json
tokenSplit = token.split(".")
json.loads((base64.b64decode(tokenSplit[1])).decode("utf-8"))

感谢@KlausD。对于简单的黑客