script_lecture_notes.py

import requests
import json
import os

notesid=input("Enter the notes-id present in url; checkout github for explanation")
content_id="82"
content_id=str(notesid)
base_url= "https://lecturenotes.in/material/" +content_id
client=requests.Session()

cookie="lnsref=bba61fdf6086c715ef5a2153f399aa40"
head={
      "Cookie":cookie,
      'accept': 'text/html,application/xhtml+xml,application/xml',
      'user-agent': "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0",
    "TE":"Trailers"
}
r = client.get(base_url, headers=head)
 
# print(r.text)
data=r.text
st=(data.find('csrfToken'))
cst=(data.find('"',st,len(data)-1))
end=data.find('"',cst+1,cst+100);
csrf=""
for i in range(cst+1,end):
    csrf+=(data[i])
print(csrf)
page_no=1
url= "https://lecturenotes.in/material/"+str(content_id)+"/page-"+str(page_no)+"?noOfItems=30"
token= "oG7nVEzv4_pjQ4CG2BfDYXjI5M1H-vnUVhZ-lYtRbv4"
cookie="lnsref=bba61fdf6086c715ef5a2153f399aa40"
host="lecturenotes.in"
head={"X-CSRF-Token":csrf,
#      "Cookie":cookie,
      "host":host,
     'accept': 'text/html,application/xhtml+xml,application/xml',
      'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'
     }
try:
    os.mkdir(os.getcwd()+ "/" +str(content_id))
except OSError:  
    print ("Creation of the directory  failed", OSError)
next_page=True

while(next_page):
   
    url= "https://lecturenotes.in/material/"+str(content_id)+"/page-"+str(page_no)+"?noOfItems=30"
    
    data=client.get(url,headers=head)
    # print(data.content)
    d=json.loads(data.text)
    if(len(d['page'])<30):
        next_page=False
    
    img_base_url= "https://lecturenotes.in"
    for pg in d['page']:
        print(pg['path'])
        r = client.get(img_base_url+pg['path'], headers=head)

        with open(str(content_id)+"/"+str(pg["pageNum"])+".jpg",'wb') as f:
            f.write(r.content)
    page_no+=30