OAuth2 InvalidScopeError in Backend Application flow

Question

我正在尝试实现后端应用程序流以从Datahug API获取访问令牌(按照 https://api.datahug.com/#gettingstarted 中的说明进行操作(。

from oauthlib.oauth2 import BackendApplicationClient
from requests_oauthlib import OAuth2Session
def get_access_token():
token_url = 'https://apps.datahug.com/identity/connect/token'
client_id = CLIENT_ID
client_secret = CLIENT_SECRET
scope = 'datahug_api'
client = BackendApplicationClient(client_id=client_id)
client.prepare_request_body(scope=[scope])
oauth = OAuth2Session(client=client)
token = oauth.fetch_token(token_url=token_url,
client_id=client_id,
client_secret=client_secret)
return token
if __name__ == '__main__':
token = get_access_token()
print(token)

运行此代码时，我收到一个无效范围错误，即

user:dh user$ python so_test.py
Traceback (most recent call last):
File "so_test.py", line 21, in <module>
token = get_access_token()
File "so_test.py", line 17, in get_access_token
client_secret=client_secret)
File "/Users/user/anaconda3/lib/python3.5/site-packages/requests_oauthlib/oauth2_session.py", line 244, in fetch_token
self._client.parse_request_body_response(r.text, scope=self.scope)
File "/Users/user/anaconda3/lib/python3.5/site-packages/oauthlib/oauth2/rfc6749/clients/base.py", line 409, in parse_request_body_response
self.token = parse_token_response(body, scope=scope)
File "/Users/user/anaconda3/lib/python3.5/site-packages/oauthlib/oauth2/rfc6749/parameters.py", line 376, in parse_token_response
validate_token_parameters(params)
File "/Users/user/anaconda3/lib/python3.5/site-packages/oauthlib/oauth2/rfc6749/parameters.py", line 383, in validate_token_parameters
raise_from_error(params.get('error'), params)
File "/Users/user/anaconda3/lib/python3.5/site-packages/oauthlib/oauth2/rfc6749/errors.py", line 325, in raise_from_error
raise cls(**kwargs)
oauthlib.oauth2.rfc6749.errors.InvalidScopeError: (invalid_scope) 

似乎问题出在值scope='datahug_api'，但这是datahug api中建议的值。关于如何解决这个问题的任何建议都非常感谢。

Answer 1

我成功地将范围添加到后端应用程序客户端，从开发人员文档中可以看出。

client = BackendApplicationClient(client_id=client_id, scope=scope)
oauth = OAuth2Session(client=client)
token = oauth.fetch_token(token_url=url, client_id=client_id, client_secret=client_secret)

Answer 2

您在 oauth.fetch_token((中缺少范围。
因此，您的变量令牌应该是：

token = oauth.fetch_token(token_url=token_url,scope=scope,client_id=client_id,
client_secret=client_secret)