There are a couple of related questions on here, but I haven't been able to solve my problem by looking at their answers so I thought I would give this a go.
Basically I am trying to download some *.zip files from a website that requires a username/password. This is the website login page:
http://data.theice.com/MyAccount/Login.aspx
Once logged in (in a normal browser session), I can download the *.zip files I need by following the download links, such as:
http://data.theice.com/MyAccount/Download.aspx?PUID=41483&PDS=2&PRODID=3744&TS=2014
My attempt so far has tried to make use of the cookielib, urllib, urllib2 and HTMLParser libraries. I use the HTMLParser to read the values of __VIEWSTATE and __EVENTVALIDATION as I read that it was important to resubmit the same values back in the form. However, when I try and open the login page with the correct login data, I just retrieve the (un-authenticated) login page. I'm really not sure what I am doing wrong, but any help would be much appreciated.
Thanks :)
P.S. I realise I have pasted a lot of code here. I just did this for completeness really, but I am pretty sure that the code that fetches the values of __VIEWSTATE and __EVENTVALIDATION is returning the correct values.
import cookielib
import urllib
import urllib2
from HTMLParser import HTMLParser
class IceConnection(object):
def __init__(self, username, password):
self.username = username
self.password = password
self.url = "http://data.theice.com/MyAccount/Login.aspx"
self.headers = [
('user-agent','Mozilla/5.0 (Windows NT 6.3; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0'),
('accept','text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'),
('accept-language','en-US,en;q=0.5'),
('accept-encoding','gzip, deflate'),
('accept-charset','iso-8859-1,utf-8;q=0.7,*;q=0.7'),
('connection','keep-alive'),
('content-type','application/x-www-form-urlencoded')
]
self.cookies = cookielib.CookieJar()
self.opener = urllib2.build_opener(
urllib2.HTTPRedirectHandler(),
urllib2.HTTPHandler(debuglevel=0),
urllib2.HTTPSHandler(debuglevel=0),
urllib2.HTTPCookieProcessor(self.cookies)
)
self.opener.addheaders = self.headers
#Extract view_state and event_validation variables:
field_names = [r'__VIEWSTATE', r'__EVENTVALIDATION']
field_values = self.extractFields(field_names)
view_state = field_values[0]
event_validation = field_values[1]
self.fields = (
(r'__EVENTTARGET', r''),
(r'__EVENTARGUMENT', r''),
(r'__LASTFOCUS',r''),
(r'__VIEWSTATE', view_state),
(r'__EVENTVALIDATION', event_validation),
(r'ctl00$ContentPlaceHolder1$LoginControl$m_userName', username),
(r'ctl00$ContentPlaceHolder1$LoginControl$m_password', password)
)
login_data = urllib.urlencode(self.fields)
print response = self.opener.open(self.url, login_data)
def extractFields(self, field_names):
response = self.opener.open(self.url)
html = ''.join(response.readlines())
ret = list()
for field in field_names:
parser = PageParser(field)
parser.feed(html)
ret.append(parser.value)
return ret
class PageParser(HTMLParser):
def __init__(self, field_name):
HTMLParser.__init__(self)
self.field = field_name
def handle_starttag(self, tag, attrs):
if tag == 'input':
#Create dictionary of attributes
attributes = dict()
for attr in attrs:
attributes[attr[0]] = attr[1]
if attributes.has_key('name'):
if attributes['name'] == self.field:
self.value = attributes['value']
I have actually managed to solve my issue by using my browser (Google Chrome) to look at the POST Headers sent to the server. I noticed this line:
__EVENTTARGET:ctl00$ContentPlaceHolder1$LoginControl$LoginButton
So I replaced the blank string in my code with the above line and it now works!