nhentai downloader

#coded by Agunq
#email agunq.e@gmail.com
#last test 25 Feb 2021

import re
import sys
import os
import threading

if sys.version_info[0] < 3:
    class urllib:
        request = __import__("urllib2")
    input = raw_input
else:
    import urllib.request

def nhentai_get_page(gid):
    host = "nhentai"
    url = "%s://%s.net/g/%s/1/" % ("ht" + "tps", host, gid)
    hdr = { 'User-Agent' : 'Mozilla/5.0 (Windows NT 6.1; Win64; x64)' }
    req = urllib.request.Request(url, headers = hdr)
    resp = urllib.request.urlopen(req).read().decode("utf-8")
    pages = re.search("<span class=\"num-pages\">(.*?)<\/span><\/button>", resp)
    if pages:
        pages = int(pages.group(1))

    img = re.findall("<img src=\"(.*?)\"(.*?|)>", resp)
    if len(img) > 0:
        img = img[1][0]
        imgid = img.split("/")[4]
        ext = img.split(".")[-1]
    newset = []
    for i in range(1, pages + 1):
        url_image = "%s://i.%s.net/galleries/%s/%s.%s" % ("ht" + "tps", host, imgid, i, ext)
        newset.append(url_image)
    return newset



def nhentai_get_image(gid, url_images):
    host = "nhentai"
    for url in url_images:
        try:
            if not os.path.exists('%s-%s' % (host, gid)):
                os.makedirs('%s-%s' % (host, gid))
            hdr = { 'User-Agent' : 'Mozilla/5.0 (Windows NT 6.1; Win64; x64)' }
            req = urllib.request.Request(url, headers = hdr)
            resp = urllib.request.urlopen(req).read()
            print("[now] [download] %s-%s/%s" % (host, gid, url.split("/")[-1]))
            f = open("%s-%s/%s" % (host, gid, url.split("/")[-1]), "wb+")
            f.write(resp)
            f.close()
        except:
            print("[error] [failed] [download] %s-%s/%s" % (host, gid, url.split("/")[-1]))
            next

def chunk_list(lis, chunk_size):
    for i in range(0, len(lis), chunk_size):
        yield lis[i:i + chunk_size]

def nhentai(gid):
    print("[start] [download] %s" % gid)
    url_images = nhentai_get_page(gid)
    url_images = chunk_list(url_images, int(int(len(url_images))/5)) # 5 = total threads, you can change it to 10 or more
    thread_list = []
    num = 0
    for url in url_images:
        th = threading.Thread(target=nhentai_get_image, args=(gid, url, ))
        th.start()
        thread_list.append(th)
        num += 1
    for thread in thread_list:
        thread.join()
    print("[finish] [done] %s" % gid)

#example
nhentai("161745")