Estou tentando estabelecer uma comunicação bem-sucedida através de uma conexão HTTPS usando autenticação. Estou usando o Python 2.7 com Django 1.4 no Ubuntu 12.04.

A documentação da API que estou seguindo tem requisitos específicos para autenticação. Incluindo oAuthentication cabeçalho que você encontrará abaixo e enviando as informações do certificado.

Este é o código:

import httplib
import base64

HOST = 'some.host.com'
API_URL = '/some/api/path'

username = '1234'
password = '5678'

auth_value = base64.b64encode('WS{0}._.1:{1}'.format(username, password))
path = os.path.join(os.path.dirname(__file__), 'keys/')
pem_file = '{0}WS{1}._.1.pem'.format(path, username)

xml_string = '<some><xml></xml><stuff></stuff></some>'

headers = { 'User-Agent'     : 'Rico',
            'Content-type'   : 'text/xml',
            'Authorization'  : 'Basic {0}'.format(auth_value),
          }



conn = httplib.HTTPSConnection(HOST, cert_file = pem_file)
conn.putrequest("POST", API_URL, xml_string, headers)
response = conn.getresponse()

Estou recebendo o seguinte erro:

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
  77.         return view_func(*args, **kwargs)
File "/home/tokeniz/tokeniz/gateway_interface/views.py" in processPayment
  37.         processCreditCard = ProcessCreditCard(token, postHandling)
File "/home/tokeniz/tokeniz/gateway_interface/credit_card_handling.py" in __init__
  75.             self.processGateway()
File "/home/tokeniz/tokeniz/gateway_interface/credit_card_handling.py" in processGateway
  95.         gateway = Gateway(self)
File "/home/tokeniz/tokeniz/gateway_interface/first_data.py" in __init__
  37.         self.postInfo()
File "/home/tokeniz/tokeniz/gateway_interface/first_data.py" in postInfo
  245.         response = conn.getresponse()
File "/usr/lib/python2.7/httplib.py" in getresponse
  1018.             raise ResponseNotReady()

Exception Type: ResponseNotReady at /processPayment/
Exception Value: 

Por que estou recebendo esse erro?

UPDATE 1: Eu tenho usado o.pem arquivo que eles me deram (Link Point Gateway), mas leram que o arquivo de certificado deve conter tanto o certificado quanto a chave privada RSA. Isso está correto? Eu tentei enviar um.pem arquivo contendo ambos e recebeu o seguinte erro:

    Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
  77.         return view_func(*args, **kwargs)
File "/home/tokeniz/tokeniz/gateway_interface/views.py" in processPayment
  37.         processCreditCard = ProcessCreditCard(token, postHandling)
File "/home/tokeniz/tokeniz/gateway_interface/credit_card_handling.py" in __init__
  75.             self.processGateway()
File "/home/tokeniz/tokeniz/gateway_interface/credit_card_handling.py" in processGateway
  95.         gateway = Gateway(self)
File "/home/tokeniz/tokeniz/gateway_interface/first_data.py" in __init__
  37.         self.postInfo()
File "/home/tokeniz/tokeniz/gateway_interface/first_data.py" in postInfo
  251.         conn.request('POST', self.API_URL, self.xml_string, headers)
File "/usr/lib/python2.7/httplib.py" in request
  958.         self._send_request(method, url, body, headers)
File "/usr/lib/python2.7/httplib.py" in _send_request
  992.         self.endheaders(body)
File "/usr/lib/python2.7/httplib.py" in endheaders
  954.         self._send_output(message_body)
File "/usr/lib/python2.7/httplib.py" in _send_output
  814.         self.send(msg)
File "/usr/lib/python2.7/httplib.py" in send
  776.                 self.connect()
File "/usr/lib/python2.7/httplib.py" in connect
  1161.             self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)
File "/usr/lib/python2.7/ssl.py" in wrap_socket
  381.                      ciphers=ciphers)
File "/usr/lib/python2.7/ssl.py" in __init__
  141.                                         ciphers)

Exception Type: SSLError at /processPayment/
Exception Value: [Errno 336265225] _ssl.c:351: error:140B0009:SSL routines:SSL_CTX_use_PrivateKey_file:PEM lib

Eu não posso dizer se isso é um passo à frente ou para trás.

ATUALIZAÇÃO 2: Eu tentei passar um arquivo de certificado e um arquivo de chave ao criar o objeto de conexão.

conn = httplib.HTTPSConnection(HOST, cert_file = pem_file, key_file = key_file)

Estou tendo o erro a seguir:

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
  77.         return view_func(*args, **kwargs)
File "/home/tokeniz/tokeniz/gateway_interface/views.py" in processPayment
  37.         processCreditCard = ProcessCreditCard(token, postHandling)
File "/home/tokeniz/tokeniz/gateway_interface/credit_card_handling.py" in __init__
  75.             self.processGateway()
File "/home/tokeniz/tokeniz/gateway_interface/credit_card_handling.py" in processGateway
  95.         gateway = Gateway(self)
File "/home/tokeniz/tokeniz/gateway_interface/first_data.py" in __init__
  37.         self.postInfo()
File "/home/tokeniz/tokeniz/gateway_interface/first_data.py" in postInfo
  252.         conn.request('POST', self.API_URL, self.xml_string, headers)
File "/usr/lib/python2.7/httplib.py" in request
  958.         self._send_request(method, url, body, headers)
File "/usr/lib/python2.7/httplib.py" in _send_request
  992.         self.endheaders(body)
File "/usr/lib/python2.7/httplib.py" in endheaders
  954.         self._send_output(message_body)
File "/usr/lib/python2.7/httplib.py" in _send_output
  814.         self.send(msg)
File "/usr/lib/python2.7/httplib.py" in send
  776.                 self.connect()
File "/usr/lib/python2.7/httplib.py" in connect
  1161.             self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)
File "/usr/lib/python2.7/ssl.py" in wrap_socket
  381.                      ciphers=ciphers)
File "/usr/lib/python2.7/ssl.py" in __init__
  141.                                         ciphers)

Exception Type: SSLError at /processPayment/
Exception Value: [Errno 336265225] _ssl.c:351: error:140B0009:SSL routines:SSL_CTX_use_PrivateKey_file:PEM lib

Se eu tentar combinar o arquivo de certificado e o arquivo de chave e enviá-lo como argumento de certificado, recebo o mesmo erro.