Dropbox Python SDK SSL error

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.

Did you also do print ssl.__file___? From the dir(ssl) results, it looks like you're getting Twisted's twisted.internet.ssl instead of the standard ssl. Maybe your import path is messed up? — Kannan Goundan
– Kannan Goundan, Commented Jun 28, 2012 at 15:13
You were right! ssl.__file__ prints out /usr/lib/python2.7/dist-packages/twisted/internet/ssl.pyc. I had forgotten that I imported *-twisted.internet.ssl, so that I could establish a secure connection between my client and server programs. I tried changing the import statement to from twisted.internet import ssl a twisted_ssl so that it wouldn't interfere with Dropbox, and updated the reference to ssl in reactor.listenSSL. I am still having the ssl.CERT_REQUIRED error, though. — Aaron Hill
– Aaron Hill, Commented Jun 28, 2012 at 16:28
The Dropbox SDK does import ssl, so I don't know why the twisted.internet.ssl is getting imported. Check your PYTHONPATH environment variable to make sure it isn't set to include more than it should. — Kannan Goundan
– Kannan Goundan, Commented Jun 28, 2012 at 16:33

Community · Accepted Answer · 2017-05-23 11:43:22Z

3

I'm getting the same error. I tried what you suggested, and it turns out that ssl module has no attribute 'file', and only has ['doc', 'loader', 'name', 'package'] when I print dir(ssl). Also worth noting is that when I try print str(ssl) in google app engine, I see: module 'ssl' (built-in) but when I run python from the command line, I see: module 'ssl' from '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.pyc' and the ssl from the command line has a file attribute.

Not sure how ssl is getting hijacked... but I'm pretty sure it is.

EDIT: loader is google.appengine.tools.dev_appserver_import_hook.HardenedModulesHook object at 0x1142684d0

EDIT: found a related problem here: SSLError on Google App Engine (local dev-server)

edited May 23, 2017 at 11:43

CommunityBot

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answered Nov 6, 2012 at 15:43

user1803599

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Comments

Kannan Goundan · Accepted Answer · 2012-06-08 04:41:35Z

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.

answered Jun 8, 2012 at 4:41

Kannan Goundan

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