PLC/PyCurl.py

   1 #
   2 # Replacement for xmlrpclib.SafeTransport, which does not validate
   3 # SSL certificates. Requires PyCurl.
   4 #
   5 # Mark Huang <mlhuang@cs.princeton.edu>
   6 # Copyright (C) 2006 The Trustees of Princeton University
   7 #
   8 # $Id$
   9 #
  10
  11 import os
  12 import xmlrpclib
  13 import pycurl
  14 from tempfile import NamedTemporaryFile
  15
  16 class PyCurlTransport(xmlrpclib.Transport):
  17     def __init__(self, uri, cert = None, timeout = 300):
  18         xmlrpclib.Transport.__init__(self)
  19         self.curl = pycurl.Curl()
  20
  21         # Suppress signals
  22         self.curl.setopt(pycurl.NOSIGNAL, 1)
  23
  24         # Follow redirections
  25         self.curl.setopt(pycurl.FOLLOWLOCATION, 1)
  26
  27         # Set URL
  28         self.url = uri
  29         self.curl.setopt(pycurl.URL, str(uri))
  30
  31         # Set certificate path
  32         if cert is not None:
  33             if os.path.exists(cert):
  34                 cert_path = str(cert)
  35             else:
  36                 # Keep a reference so that it does not get deleted
  37                 self.cert = NamedTemporaryFile(prefix = "cert")
  38                 self.cert.write(cert)
  39                 self.cert.flush()
  40                 cert_path = self.cert.name
  41             self.curl.setopt(pycurl.CAINFO, cert_path)
  42             self.curl.setopt(pycurl.SSL_VERIFYPEER, 2)
  43
  44         # Set connection timeout
  45         if timeout:
  46             self.curl.setopt(pycurl.CONNECTTIMEOUT, timeout)
  47             self.curl.setopt(pycurl.TIMEOUT, timeout)
  48
  49         # Set request callback
  50         self.body = ""
  51         def body(buf):
  52             self.body += buf
  53         self.curl.setopt(pycurl.WRITEFUNCTION, body)
  54
  55     def request(self, host, handler, request_body, verbose = 1):
  56         # Set verbosity
  57         self.curl.setopt(pycurl.VERBOSE, verbose)
  58
  59         # Post request
  60         self.curl.setopt(pycurl.POST, 1)
  61         self.curl.setopt(pycurl.POSTFIELDS, request_body)
  62
  63         try:
  64             self.curl.perform()
  65             errcode = self.curl.getinfo(pycurl.HTTP_CODE)
  66             response = self.body
  67             self.body = ""
  68         except pycurl.error, err:
  69             (errcode, errmsg) = err
  70
  71         if errcode == 60:
  72             raise Exception, "PyCurl: SSL certificate validation failed"
  73         elif errcode != 200:
  74             raise Exception, "PyCurl: HTTP error %d -- %r" % (errcode,errmsg)
  75
  76         # Parse response
  77         p, u = self.getparser()
  78         p.feed(response)
  79         p.close()
  80
  81         return u.close()