python ile http basic authentication

#!/usr/bin/python

import urllib2
import sys
import re
import base64
from urlparse import urlparse

theurl = 'https://mail.google.com/mail/feed/atom/'
# if you want to run this example you'll need to supply
# a protected page with your username and password

username = 'kullanici_adi'
password = 'parola'            

req = urllib2.Request(theurl)
try:
  handle = urllib2.urlopen(req)
except IOError, e:
  # here we *want* to fail
  pass
else:
  # If we don't fail then the page isn't protected
  print "This page isn't protected by authentication."
  sys.exit(1)

if not hasattr(e, 'code') or e.code != 401:
  # we got an error - but not a 401 error
  print "This page isn't protected by authentication."
  print 'But we failed for another reason.'
  sys.exit(1)

authline = e.headers['www-authenticate']
# this gets the www-authenticate line from the headers
# which has the authentication scheme and realm in it


authobj = re.compile(
  r'''(?:\s*www-authenticate\s*:)?\s*(\w*)\s+realm=['"]([^'"]+)['"]''',
  re.IGNORECASE)
# this regular expression is used to extract scheme and realm
matchobj = authobj.match(authline)

if not matchobj:
  # if the authline isn't matched by the regular expression
  # then something is wrong
  print 'The authentication header is badly formed.'
  print authline
  sys.exit(1)

scheme = matchobj.group(1)
realm = matchobj.group(2)
# here we've extracted the scheme
# and the realm from the header
if scheme.lower() != 'basic':
  print 'This example only works with BASIC authentication.'
  sys.exit(1)

base64string = base64.encodestring(
              '%s:%s' % (username, password))[:-1]
authheader =  "Basic %s" % base64string
req.add_header("Authorization", authheader)
try:
  handle = urllib2.urlopen(req)
except IOError, e:
  # here we shouldn't fail if the username/password is right
  print "It looks like the username or password is wrong."
  sys.exit(1)
thepage = handle.read()
print thepage