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ImportError: cannot import name certificate_transparency

See original GitHub issue

Environment info

Operating System: Ubuntu 16 Python version: 3.6 pyopnessl version: 19.0.0 cryptography version: 2.7 gspread version: 3.1.0

Steps to reproduce

  1. Use Authlib instead of oauth2client
  2. Use the code mentioned here.
  3. Try to open a sheet using gc.open.

Stack trace or other output that would be helpful

[Tue Sep 17 16:22:18.385805 2019] [wsgi:error] Traceback (most recent call last):
[Tue Sep 17 16:22:18.385811 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
[Tue Sep 17 16:22:18.385816 2019] [wsgi:error]     response = self.full_dispatch_request()
[Tue Sep 17 16:22:18.385821 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request
[Tue Sep 17 16:22:18.385827 2019] [wsgi:error]     rv = self.handle_user_exception(e)
[Tue Sep 17 16:22:18.385847 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception
[Tue Sep 17 16:22:18.385852 2019] [wsgi:error]     reraise(exc_type, exc_value, tb)
[Tue Sep 17 16:22:18.385857 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
[Tue Sep 17 16:22:18.385861 2019] [wsgi:error]     rv = self.dispatch_request()
[Tue Sep 17 16:22:18.385866 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
[Tue Sep 17 16:22:18.385871 2019] [wsgi:error]     return self.view_functions[rule.endpoint](**req.view_args)
[Tue Sep 17 16:22:18.385875 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/myapp/views/event.py", line 64, in validate
[Tue Sep 17 16:22:18.385880 2019] [wsgi:error]     worksheet = gc.open("Event Validation Test").sheet1
[Tue Sep 17 16:22:18.385884 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/gspread/client.py", line 123, in open
[Tue Sep 17 16:22:18.385889 2019] [wsgi:error]     self.list_spreadsheet_files()
[Tue Sep 17 16:22:18.385893 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/gspread/client.py", line 96, in list_spreadsheet_files
[Tue Sep 17 16:22:18.385898 2019] [wsgi:error]     res = self.request('get', url, params=params).json()
[Tue Sep 17 16:22:18.385902 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/gspread/client.py", line 73, in request
[Tue Sep 17 16:22:18.385907 2019] [wsgi:error]     headers=headers
[Tue Sep 17 16:22:18.385911 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/requests/sessions.py", line 546, in get
[Tue Sep 17 16:22:18.385916 2019] [wsgi:error]     return self.request('GET', url, **kwargs)
[Tue Sep 17 16:22:18.385920 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/client/assertion_session.py", line 43, in request
[Tue Sep 17 16:22:18.385925 2019] [wsgi:error]     method, url, headers=headers, data=data, auth=auth, **kwargs)
[Tue Sep 17 16:22:18.385930 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/requests/sessions.py", line 519, in request
[Tue Sep 17 16:22:18.385934 2019] [wsgi:error]     prep = self.prepare_request(req)
[Tue Sep 17 16:22:18.385939 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/requests/sessions.py", line 462, in prepare_request
[Tue Sep 17 16:22:18.385944 2019] [wsgi:error]     hooks=merge_hooks(request.hooks, self.hooks),
[Tue Sep 17 16:22:18.385949 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/requests/models.py", line 317, in prepare
[Tue Sep 17 16:22:18.385954 2019] [wsgi:error]     self.prepare_auth(auth, url)
[Tue Sep 17 16:22:18.385966 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/requests/models.py", line 548, in prepare_auth
[Tue Sep 17 16:22:18.385971 2019] [wsgi:error]     r = auth(self)
[Tue Sep 17 16:22:18.385975 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/client/assertion_session.py", line 9, in __call__
[Tue Sep 17 16:22:18.385980 2019] [wsgi:error]     self.ensure_refresh_token()
[Tue Sep 17 16:22:18.385984 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/client/assertion_client.py", line 9, in ensure_refresh_token
[Tue Sep 17 16:22:18.385989 2019] [wsgi:error]     return self.client.refresh_token()
[Tue Sep 17 16:22:18.385993 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/oauth2/rfc7521/client.py", line 55, in refresh_token
[Tue Sep 17 16:22:18.385998 2019] [wsgi:error]     **self._kwargs
[Tue Sep 17 16:22:18.386002 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/oauth2/rfc7523/grant.py", line 24, in sign
[Tue Sep 17 16:22:18.386007 2019] [wsgi:error]     expires_at, claims, **kwargs)
[Tue Sep 17 16:22:18.386012 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/oauth2/rfc7523/assertion.py", line 36, in sign_jwt_bearer_assertion
[Tue Sep 17 16:22:18.386016 2019] [wsgi:error]     return jwt.encode(header, payload, key)
[Tue Sep 17 16:22:18.386021 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/jose/rfc7519/jwt.py", line 95, in encode
[Tue Sep 17 16:22:18.386025 2019] [wsgi:error]     return self._jws.serialize_compact(header, text, key)
[Tue Sep 17 16:22:18.386030 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/jose/rfc7515/jws.py", line 71, in serialize_compact
[Tue Sep 17 16:22:18.386035 2019] [wsgi:error]     self._algorithms, jws_header, payload, key, private=True)
[Tue Sep 17 16:22:18.386039 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/jose/util.py", line 12, in prepare_algorithm_key
[Tue Sep 17 16:22:18.386044 2019] [wsgi:error]     key = algorithm.prepare_private_key(key)
[Tue Sep 17 16:22:18.386048 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/authlib/jose/rfc7518/_backends/_key_cryptography.py", line 19, in prepare_private_key
[Tue Sep 17 16:22:18.386053 2019] [wsgi:error]     return load_pem_private_key(key, password=None, backend=default_backend())
[Tue Sep 17 16:22:18.386058 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/cryptography/hazmat/backends/__init__.py", line 15, in default_backend
[Tue Sep 17 16:22:18.386063 2019] [wsgi:error]     from cryptography.hazmat.backends.openssl.backend import backend
[Tue Sep 17 16:22:18.386067 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/cryptography/hazmat/backends/openssl/__init__.py", line 7, in <module>
[Tue Sep 17 16:22:18.386076 2019] [wsgi:error]     from cryptography.hazmat.backends.openssl.backend import backend
[Tue Sep 17 16:22:18.386081 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 18, in <module>
[Tue Sep 17 16:22:18.386085 2019] [wsgi:error]     from cryptography import utils, x509
[Tue Sep 17 16:22:18.386090 2019] [wsgi:error]   File "/var/www/abc.example.com/public_html/venv/lib/python3.6/site-packages/cryptography/x509/__init__.py", line 7, in <module>
[Tue Sep 17 16:22:18.386095 2019] [wsgi:error]     from cryptography.x509 import certificate_transparency
[Tue Sep 17 16:22:18.386099 2019] [wsgi:error] ImportError: cannot import name certificate_transparency

What I have tried so far:

  1. Checked if the file path is correct. certificate_transparency.py does exist in /venv/lib/python3.6/site-packages/cryptography/x509.
  2. Tried the same on Windows, it works without any error.
  3. Reinstalled all dependencies, including pyOpenSSL.
  4. Tried importing it inside (venv) Python console. >>> from cryptography.x509 import certificate_transparency works fine.

My code:

def create_assertion_session(conf_file, scopes, subject=None):
    with open(conf_file, 'r') as f:
        conf = json.load(f)

    token_url = conf['token_uri']
    issuer = conf['client_email']
    key = conf['private_key']
    key_id = conf.get('private_key_id')

    header = {'alg': 'RS256'}
    if key_id:
        header['kid'] = key_id

    # Google puts scope in payload
    claims = {'scope': ' '.join(scopes)}
    return AssertionSession(
        grant_type=AssertionSession.JWT_BEARER_GRANT_TYPE,
        token_url=token_url,
        issuer=issuer,
        audience=token_url,
        claims=claims,
        subject=subject,
        key=key,
        header=header,
    )

scopes = [
    'https://spreadsheets.google.com/feeds',
    'https://www.googleapis.com/auth/drive',
]
session = create_assertion_session(json_key_file, scopes)
gc = Client(None, session)
worksheet = gc.open("Event Validation Test").sheet1 # this causes the error

requirements.txt:

asn1crypto==0.24.0
Authlib==0.12.1
blinker==1.4
certifi==2019.6.16
cffi==1.12.3
chardet==3.0.4
Click==7.0
colorama==0.4.1
cryptography==2.7
Flask==1.1.1
Flask-Mail==0.9.1
gspread==3.1.0
httplib2==0.13.1
idna==2.8
itsdangerous==1.1.0
Jinja2==2.10.1
MarkupSafe==1.1.1
pyasn1==0.4.7
pyasn1-modules==0.2.6
pycparser==2.19
pymaging==0.1
pymaging-png==0.1
pyOpenSSL==19.0.0
requests==2.22.0
rsa==4.0
six==1.12.0
urllib3==1.25.3
Werkzeug==0.15.5

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:5 (3 by maintainers)

github_iconTop GitHub Comments

1reaction
reaperhulkcommented, Sep 17, 2019

This exception typically occurs on systems where the user has both a pip installed and system installed cryptography package. If you create a virtualenv and run your code inside that what happens?

0reactions
reaperhulkcommented, Sep 18, 2019

Huh, well that definitely looks right. I think we need a docker env that can reproduce this to debug much more 😞

There’s definitely something occurring where the import machinery is looking in the wrong place, but I don’t see how.

Read more comments on GitHub >

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