how to log in to otaku-streamers in python (vbulletin)

otaku-login.py

import cookielib
import md5
import re
import sys
import urllib
import urllib2


def login(username, password, cookie_file):
    '''login to otaku-streamers.com and save session cookies'''

    login_url = 'http://otaku-streamers.com/community/login.php?do=login'

    #create cookiejar
    cj = cookielib.LWPCookieJar()

    #tell urllib2 to handle cookies
    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
    urllib2.install_opener(opener)

    #try to load existing cookies
    try:
        #ignore_discard=True loads session cookies too
        cj.load(cookie_file, ignore_discard=True)

        print 'cookies loaded, checking if they are still valid...'
        
        #check to see if login cookies still valid 
        response = urllib2.urlopen('http://otaku-streamers.com/community/faq.php')
        html = response.read()

        if 'class="welcomelink"' in html:
            print 'already logged in as %s.' % username
            #lets get out of here!
            return True

    #if cookie file does not exist we just keep going...
    except IOError:
        pass

    print 'logging in...'

    #the onsubmit() javascript does this bit
    password_md5 = md5.md5(password).hexdigest()

    #build POST data (including hidden form fields)
    post_data = urllib.urlencode({'vb_login_username': username,
                                  's': '',
                                  'securitytoken': 'guest',
                                  'do': 'login',
                                  'vb_login_md5password': password_md5,
                                  'vb_login_md5password_utf': password_md5,
                                  })

    #POST to login page
    response = urllib2.urlopen(login_url, post_data)

    #check for login string
    html = response.read()

    if 'Thank you for logging in, %s.' % username in html:
        print 'logged in to otaku-streamers as %s.' % username

        #save cookies to disk (ignore_discard=True saves session cookies)
        cj.save(cookie_file, ignore_discard=True)
        return True
    else:
        print 'login failed'
        return False


def resolve(web_url):
    '''return the video stream link for the given web page'''
    
    #grab the page (we already installed our cookie processing opener
    #so no need to do it again)
    response = urllib2.urlopen(web_url)
    html = response.read()
    
    #find the video url
    video_url = re.findall('"file", "(http.+?video.mp4")', html)
    return video_url[0]

#if called from command line....
if __name__ == '__main__':
    #get username and password from command line eg.
    #python otaku-login.py my_username my_password /path/to/otaku.cookies
    username = sys.argv[1]
    password = sys.argv[2]
    cookie_file = sys.argv[3]

    #do the login    
    success = login(username, password, cookie_file)
    
    #resolve a link
    url='http://otaku-streamers.com/watch/1955/ep1-Bartender'
    print resolve(url)