Question

I am learning how to use the Dropbox Python SDK. However, I run into a problem when I try to generate my request token. Here is the code I am using (note that I have replaced my actual app key and secret with APP_KEY and APP_SECRET here, but I used my actual app key and secret when I try it out.)

from dropbox import client, rest, session
APP_KEY = 'APP_KEY'
APP_SECRET = 'APP_SECRET'
ACCESS_TYPE = 'app_folder'
print 'Creating session object'
sess = session.DropboxSession(APP_KEY, APP_SECRET, ACCESS_TYPE)
print 'Session created!\nCreating request token'
request_token = sess.obtain_request_token()
print 'Created request token!'
url = sess.build_authorize_url(request_token)
print url
raw_input()
access_token = sess.obtain_access_token(request_token)
client1 = client.DropboxClient(sess)
print client1.account_info()

I had the program print out messages as it was creating the different objects so that I could see where the error occurred. This is the output:

aaron@Aarons-Ubuntu-Computer:~/Twisted$ python example.py
Creating session object
Session created!
Creating request token
Traceback (most recent call last):
  File "example.py", line 8, in <module>
    request_token = sess.obtain_request_token()
File "/usr/local/lib/python2.7/dist-packages/dropbox-1.4-py2.7.egg/dropbox/session.py", line 160, in obtain_request_token
response = rest.RESTClient.POST(url, headers=headers, params=params, raw_response=True)
File "/usr/local/lib/python2.7/dist-packages/dropbox-1.4-py2.7.egg/dropbox/rest.py", line 140, in POST
  return cls.request("POST", url, post_params=params, headers=headers, raw_response=raw_response)
File "/usr/local/lib/python2.7/dist-packages/dropbox-1.4-py2.7.egg/dropbox/rest.py", line 64, in request
  conn = ProperHTTPSConnection(host, 443)
File "/usr/local/lib/python2.7/dist-packages/dropbox-1.4-py2.7.egg/dropbox/rest.py", line 214, in __init__
  self.cert_reqs = ssl.CERT_REQUIRED
AttributeError: 'module' object has no attribute 'CERT_REQUIRED'

I had tried using this code before, and I didn’t experience this problem. I have also removed the Dropbox SDK and reinstalled it, with no result. What is causing this problem, and how can I fix it?

UPDATE

After adding Kannan’s code, the output looks like this:
Ready
Generating session
Session Generated!
Generating request token
['Certificate', 'CertificateOptions', 'CertificateRequest', 'Client', 'ClientContextFactory', 'Connector', 'ContextFactory', 'DN', 'DefaultOpenSSLContextFactory', 'DistinguishedName', 'KeyPair', 'Port', 'PrivateCertificate', 'SSL', 'Server', '__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', 'implementedBy', 'implements', 'implementsOnly', 'interfaces', 'supported', 'tcp']
Then I get the error. I have tried re-created my SSL certificates with no luck.

Answer 1

This is strange. The Python 2.7 docs definitely mention ssl.CERT_REQUIRED.

Try modifying the SDK and, right before the line that fails, add in

print dir(ssl)
print ssl.__file__

That might help you figure out what’s going wrong.