Problems returning/attaching cookies

[john.lehmann at gmail.com]

NEVERMIND.  My friend pointed out that I am simply hitting the wrong
URL when trying to "test" whether I am logged in or not.  The correct
one is:  http://www.dpreview.com/forums/editprofile.asp

But I still have one question, if anyone knows -- why is it that when I
print out the headers on my request object, they are empty?  I thought
that I should find the cookies there which are being sent back.  This
is what I thought the problem was.  Thanks if anyone can explain how
that works.

John

(PS i have stopped attacking the cookies now)


john.lehmann at gmail.com wrote:
> Attacked is a piece of code which first hits the login page
> successfully and receives back login cookies.  But then when I attempt
> to hit a page which is restricted to logged in users only, I fail.
>
> That seems to be because I am not successfully re-attaching the cookies
> to the header portion of the this request.  I have tried 2 methods
> which should both work I think.  The first was to use install_opener to
> attach the cookie handler back to urlopen.  The second method was to
> use the cookiehandler method add_cookie_header.  But in both cases,
> before sending out the 2nd request, it seems to have empty headers --
> which indicates to me that the necessary cookies have not been
> attacked.
>
> I also tryed messing with the policy quite a bit, thinking that might
> be causing the cookies not to be returned.  First I used the default,
> then set some flags on the default, then even overrode methods on the
> default to make it as lenient as possible.  This had no apparent
> effect.
>
> Thanks a lot!
>
> Below I have pasted the most relevant code section, as well as my full
> code file.  Apologies for all the comments, but I wanted to show what I
> had tried.
> -----------------
> RELEVANT CODE (snipped from full code)
>
> # NOW GO TO PAGE RESTRICTED TO LOGGED IN PEOPLE
> the_url =
> "http://www.dpreview.com/forums/login.asp?jump=editprofile.asp"
> req = urllib2.Request(the_url)
> #print "headers:", req.headers
> #cj.add_cookie_header(req)
>
> # EXPECT THESE HEADERS TO BE NON-EMPTY - BUT THEY ARE EMPTY,
> # NO COOKIES RETURNED?
> print "headers:", req.headers
>
> # THIS OPEN FAILS - I GET - "NEED TO LOGIN" PAGE
> #handle = opener.open(req)
> handle = urllib2.urlopen(req)
> the_page = handle.read()
>
> -----------------
> FULL CODE
>
> #!/usr/bin/python
>
> import urllib
> import urllib2
> import re
> import os
> from cookielib import *
>
> class MyCookiePolicy(DefaultCookiePolicy):
>   def __init__(self):
>     DefaultCookiePolicy.__init__(self, rfc2965=True,
> hide_cookie2=False, strict_ns_domain=DefaultCookiePolicy.DomainLiberal)
>   def set_ok(self, cookie, request):
>     return True
>   def return_ok(self, cookie, request):
>     return True
>   def domain_return_ok(self, cookie, request):
>     return True
>   def path_return_ok(self, cookie, request):
>     return True
>
> the_url = 'http://www.dpreview.com/forums/login_post.asp'
> user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
> values = {
>           'email' : '****',
>           'password' : '****',
>           #"remember" : "checked", # <- create permanent cookie
>           'jump' : "/forums/"
>           }
>           # also "remember" : "remember"
>
> # INITIAL REQUEST WITH USER INFO
> headers = { 'User-Agent' : user_agent }
> data = urllib.urlencode(values)
> req = urllib2.Request(the_url, data, headers)
>
> # COOKIE POLICY
> # tried using several configurations of the default cookie policy
> #policy = DefaultCookiePolicy(rfc2965=True, hide_cookie2=False,
> strict_ns_domain=DefaultCookiePolicy.DomainLiberal)
> # tried using my own custom cookie policy
> #policy = MyCookiePolicy()
> policy = DefaultCookiePolicy(rfc2965=True, hide_cookie2=False)
>
> # CREATE COOKIE JAR WITH POLICY
> cj = MozillaCookieJar()
> cj.set_policy(policy)
>
> # CREATE OPENER, AND OPEN PAGE
> opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
> urllib2.install_opener(opener)
> #handle = opener.open(req)
> handle = urllib2.urlopen(req)
> the_page = handle.read()
>
> # SHOW COOKIES COLLECTED - LOOKS GOOD HERE
> for c in cj:
>   print "COOKIE:", c
> print "URL:", handle.geturl()
> print "INFO:", handle.info()
>
> #DEMONSTRATE WE'RE LOGGED IN
> for line in the_page.split('\n'):
>   line = line.strip()
>   if re.search("Welcome to the", line):
>     print "MESSAGE:", line
>
> # NOW GO TO PAGE RESTRICTED TO LOGGED IN PEOPLE
> # - tried using the install_opener above
> # - tried using add_cookie_header
> # - either way, can't seem to get cookies in the header of this request
> the_url =
> "http://www.dpreview.com/forums/login.asp?jump=editprofile.asp"
> req = urllib2.Request(the_url)
> #print "headers:", req.headers
> #cj.add_cookie_header(req)
>
> # EXPECT THESE HEADERS TO BE NON-EMPTY
> print "headers:", req.headers
> #handle = opener.open(req)
> handle = urllib2.urlopen(req)
> the_page = handle.read()
>
> # THIS ALSO PROVES LOGIN-STATE WAS LOST
> for line in the_page.split('\n'):
>   line = line.strip()
>   if re.search("To access", line):
>     print "MESSAGE:", line
> 
> print "URL:", handle.geturl()
> print "INFO:", handle.info()