无法从 Flask 获取 json Web 令牌

Question

我有下面的 app.py 代码：

from flask import Flask
from flask_jwt import JWT, jwt_required, current_identity
from werkzeug.security import safe_str_cmp

class User(object):
    def __init__(self, id, username, password):
        self.id = id
        self.username = username
        self.password = password

    def __str__(self):
        return "User(id='%s')" % self.id

users = [
    User(1, 'user1', 'abcxyz'),
    User(2, 'user2', 'abcxyz'),
]

username_table = {u.username: u for u in users}
userid_table = {u.id: u for u in users}

def authenticate(username, password):
    user = username_table.get(username, None)
    if user and safe_str_cmp(user.password.encode('utf-8'), password.encode('utf-8')):
        return user

def identity(payload):
    user_id = payload['identity']
    return userid_table.get(user_id, None)

app = Flask(__name__)
app.debug = True
app.config['SECRET_KEY'] = 'super-secret'

jwt = JWT(app, authenticate, identity)

@app.route('/protected')
@jwt_required()
def protected():
    return '%s' % current_identity

if __name__ == '__main__':
    app.run()

当我尝试发出 post 请求以从 Postman 获取身份验证令牌时： http://127.0.0.1:5000/auth

{ “用户名”：“乔”， “密码”：“通过” }

我遇到了一个我无法解决的特殊错误：

(flask-restful) C:\Users\bhatsubh\Projects\flask-restful>python Test.py
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 973-755-004
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [06/Sep/2017 13:38:08] "POST /auth HTTP/1.1" 500 -
Traceback (most recent call last):
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1985, in wsgi_app
    response = self.handle_exception(e)
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\_compat.py"
, line 33, in reraise
    raise value
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\_compat.py"
, line 33, in reraise
    raise value
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask\app.py", li
ne 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\bhatsubh\Envs\flask-restful\lib\site-packages\flask_jwt\__init_
_.py", line 115, in _default_auth_request_handler
    username = data.get(current_app.config.get('JWT_AUTH_USERNAME_KEY'), None)
AttributeError: 'NoneType' object has no attribute 'get'

我完全不知道出了什么问题。有人可以帮我解决这个问题吗？

Answer 1

确保设置了正确的标题

内容类型：应用程序/json

尝试 curl 进行交叉检查

$ curl -H "Content-Type: application/json" -X POST -d '{ "username": "joe", "password": "pass" }' http://localhost:5000/auth

Answer 2

我怀疑你被这个吓坏了，因为 flask-jwt 中有一个错误，它会抛出错误而不是提供适当的反馈。所以很难知道发生了什么。

如果有任何标头错误，它会触发错误而不是正确的响应。

Dave B 的建议对我有用，将标题设置为：Content-Type:application/json

我向开发人员提出了这个问题，所以希望他们可以修补它。

Answer 3

查看 https://github.com/vimalloc/flask-jwt-extended 或 https://github.com/vimalloc/flask-jwt-simple 作为 Flask-JWT 的替代品。它们设计得更好，是最新的，并且仍然被维护（我是作者，所以我当然有偏见）。

Answer 4

试试这个： 本地主机：5000/auth

{ "用户名": "user1", "密码": "abcxyz" }