如何在 python 中令牌過期時提取 jwt 令牌有效負載 jwt

Question

在 jwt 令牌在 python jwt package 中過期后，我無法提取 JWT 令牌有效載荷。我正在使用 flask api 進行后端開發和實現。

下面是我的代碼：

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包中找到了解決方案。 以下是參考鏈接： https : //pyjwt.readthedocs.io/en/latest/usage.html#reading-the-claimset-without-validation

以下是我為上述所做的代碼更改：

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

將代碼與主代碼合並后，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 令牌過期，還有其他方法可以對其進行解碼：正如@KlausD 所建議的那樣。 下面是實現：

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

感謝@KlausD。 對於簡單的黑客

Answer 2

如果 options 參數不能像這樣工作：options = { "verify_signature": False }

使用 lib pyjwt==1.7.1 嘗試通知參數“verify=False”，如下所示：

payload = jwt.decode(jwt=token, key=secret, verify=False, 算法= [ 'HS256' ])