python-3.x - Boxsdk JWTAuth 一直给我这个错误 : 'NoneType' object has no attribute 'encode'

Question

我正在尝试用 python 编写一个小脚本来连接到 BOX，但它一直给我这个错误:'NoneType' 对象没有属性 'encode'

一开始我以为是我对Passphrase进行编码造成的，但好像不是这样。当我尝试使用 access_token = auth.authenticate_instance() 进行身份验证时，脚本失败。如果我在没有它的情况下运行脚本，它似乎可以工作。可能是什么原因造成的？

在此先感谢您提供的任何帮助。

这是我的:

import keyring
from boxsdk import JWTAuth
from boxsdk import Client

def read_tokens():
    """Reads authorisation tokens from keyring"""
    # Use keyring to read the tokens
    auth_token = keyring.get_password('Box_Auth', 'mybox@box.com')
    refresh_token = keyring.get_password('Box_Refresh', 'mybox@box.com')
    return auth_token, refresh_token


def store_tokens(access_token, refresh_token):
    """Callback function when Box SDK refreshes tokens"""
    # Use keyring to store the tokens
    keyring.set_password('Box_Auth', 'mybox@box.com', access_token)
    keyring.set_password('Box_Refresh', 'mybox@box.com', refresh_token)

Passphrase = 'xxxxxxx';
my_str_as_bytes = Passphrase.encode('UTF-8','strict')

auth = JWTAuth(
    client_id='xxxxxxxxxx',
    client_secret='xxxxxxxx',
    enterprise_id='xxxxxxx',
    jwt_key_id='xxxxxxx',
    rsa_private_key_file_sys_path='/home/Marketscale/keys/private_key2.pem',
    rsa_private_key_passphrase=my_str_as_bytes,
    store_tokens=store_tokens,
)

access_token = auth.authenticate_instance()

这是错误的全文:

Traceback (most recent call last):
  File "/home/Marketscale/Tests/JWTTest.py", line 37, in <module>
    access_token = auth.authenticate_instance()
  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/jwt_auth.py", line 186, in authenticate_instance
    return self._auth_with_jwt(self._enterprise_id, 'enterprise')
  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/jwt_auth.py", line 158, in _auth_with_jwt
    return self.send_token_request(data, access_token=None, expect_refresh_token=False)[0]
  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/oauth2.py", line 298, in send_token_request
    self._store_tokens(access_token, refresh_token)
  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/oauth2.py", line 233, in _store_tokens
    self._store_tokens_callback(access_token, refresh_token)
  File "/home/Marketscale/Tests/JWTTest.py", line 22, in store_tokens
    keyring.set_password('Box_Refresh', 'mybox@box.com', refresh_token)
  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/keyring/core.py", line 48, in set_password
    _keyring_backend.set_password(service_name, username, password)
  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/keyrings/alt/file_base.py", line 128, in set_password
    password_encrypted = self.encrypt(password.encode('utf-8'), assoc)
AttributeError: 'NoneType' object has no attribute 'encode'

Answer 1

我完全不知道您使用的 API，但根据查看代码的一些想法:

从下往上遍历堆栈跟踪，您有:

 File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/keyrings/alt/file_base.py", line 128, in set_password
    password_encrypted = self.encrypt(password.encode('utf-8'), assoc)
AttributeError: 'NoneType' object has no attribute 'encode'

该代码位于 https://github.com/jaraco/keyrings.alt/blob/master/keyrings/alt/file_base.py ，密码(我们知道它是 None)是传递给 set_password 函数的最后一个参数。调用自:

  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/keyring/core.py", line 48, in set_password
    _keyring_backend.set_password(service_name, username, password)

该代码位于 https://github.com/jaraco/keyring/blob/master/keyring/core.py , 而密码又是 set_password 函数的最后一个参数。接下来，我们有:

  File "/home/Marketscale/Tests/JWTTest.py", line 22, in store_tokens
    keyring.set_password('Box_Refresh', 'mybox@box.com', refresh_token)

....这是你的代码，所以 refresh_token 一定是 None。这意味着您的 store_tokens 必须使用 None 的 refresh_token 调用。下一页:

  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/oauth2.py", line 233, in _store_tokens
    self._store_tokens_callback(access_token, refresh_token)

这是在 https://github.com/box/box-python-sdk/blob/master/boxsdk/auth/oauth2.py ，再次意味着调用 _store_tokens 时将 refresh_token 设置为 None。继续……

  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/oauth2.py", line 298, in send_token_request
    self._store_tokens(access_token, refresh_token)

代码与上一个页面相同，但现在更有趣了:

        url = '{base_auth_url}/token'.format(base_auth_url=API.OAUTH2_API_URL)
        headers = {'content-type': 'application/x-www-form-urlencoded'}
        network_response = self._network_layer.request(
            'POST',
            url,
            data=data,
            headers=headers,
            access_token=access_token,
        )
        if not network_response.ok:
            raise BoxOAuthException(network_response.status_code, network_response.content, url, 'POST')
        try:
            response = network_response.json()
            access_token = response['access_token']
            refresh_token = response.get('refresh_token', None)
            if refresh_token is None and expect_refresh_token:
                raise BoxOAuthException(network_response.status_code, network_response.content, url, 'POST')
        except (ValueError, KeyError):
            raise BoxOAuthException(network_response.status_code, network_response.content, url, 'POST')
        self._store_tokens(access_token, refresh_token)
        return self._access_token, self._refresh_token

因此我们知道调用 self._store_tokens 时将 refresh_token 设置为 None，这意味着 expect_refresh_token 必须为 False，否则将引发 BoxOAuthException。事实上，如果我们查看堆栈跟踪中的下一行，我们可以看到:

  File "/home/Marketscale/.virtualenvs/myvirtualenv/lib/python3.5/site-packages/boxsdk/auth/jwt_auth.py", line 158, in _auth_with_jwt
    return self.send_token_request(data, access_token=None, expect_refresh_token=False)[0]

这对我来说表明，当您使用 JWT Auth 时，您不应该期待刷新 token 。并且考虑到当您将 None 作为密码传递给它时 key 环的文件后端会爆炸，听起来您需要以不同的方式处理 None 情况。因此，我建议更改您提供的 store_tokens 函数，以便它忽略刷新 token (如果它为 None)，即:

def store_tokens(access_token, refresh_token):
    """Callback function when Box SDK refreshes tokens"""
    # Use keyring to store the tokens
    keyring.set_password('Box_Auth', 'mybox@box.com', access_token)
    if refresh_token is not None:
        keyring.set_password('Box_Refresh', 'mybox@box.com', refresh_token)

...或者这样它将 None 转换为 key 环文件后端可以妥善处理的东西——也许一个空字符串就可以解决这个问题:

    def store_tokens(access_token, refresh_token):
        """Callback function when Box SDK refreshes tokens"""
        # Use keyring to store the tokens
        keyring.set_password('Box_Auth', 'mybox@box.com', access_token)
        if refresh_token is None:
            refresh_token = ""
        keyring.set_password('Box_Refresh', 'mybox@box.com', refresh_token)

警告——就像我说的，我不知道这些 API——既不知道你正在使用的盒子，也不知道你正在使用的 key 环。但是根据那里的代码，做这样的事情听起来很值得一试。