import urllib, http.cookiejar, requests
from bs4 import BeautifulSoup

url = "https://www.cgpbooks.co.uk/bookspace/BRAR72DF/assets/mobile/pages/page{}{}_i2.png"
filename = "C:\\twmp\\CGP 1 pg{}.png"

username = 'redacted' #you'll have to find your own login
password = 'redacted'
token = ""

with requests.Session() as s:
    r = s.get('https://account.cgpbooks.co.uk/Account/SignIn')
    soup = BeautifulSoup(r.text, "html.parser")

    for i in soup.findAll(attrs={"name":"__RequestVerificationToken"}):
        if i['name'] == '__RequestVerificationToken':
            print(i)
            token = i.get('value')
            print(i.get('value'))
    signinurl = "https://account.cgpbooks.co.uk/Account/SignIn?stsctxret=%2FIssue%3Fwa%3Dwsignin1.0%26wtrealm%3Durn%253Acgpbooks%253Aportal%26wctx%3Drm%253D0%2526id%253Dpassive%2526ru%253D%25252f%26wct%3D2016-10-08T17%253A08%253A47Z&stsctxrealm=urn%3Acgpbooks%3Aportal&stsctxid=passive"

    payload = {
        '__RequestVerificationToken': token,
        'UserName': username,
        'Password': password,
        'Remember': 'false'
    }


    p = s.post(signinurl, data=payload)

    #uthorised request.
    r = s.get('https://www.cgpbooks.co.uk/pages/bookspace.asp')
    print(r.text)


    #print('cookies', requests.utils.dict_from_cookiejar(s.cookies))

    i = 1
    while True:
        urllib.request.urlretrieve(url.format("0"*(-len(str(i))+4),i), filename.format(i))
        print("Saved page {}".format(i))
        i += 1