zsdl.py

#!/usr/bin/python3

'''
MIT License

Copyright (c) 2018 Dennis Bruner

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
'''

import sys
import re
import math
import requests
import argparse
from urllib.parse import unquote
from os.path import join

LINK_PATTERN = re.compile(r'https?:\/\/www([\d]*)\.zippyshare\.com\/v\/([\w\d]*)\/file\.html')
INFO_PATTERN = re.compile(r'document\.getElementById\(\'dlbutton\'\)\.href = \"\/d\/([\w\d]*)\/\" \+ \(([\d]*) % ([\d]*) \+ ([\d]*) % ([\d]*)\) \+ \"\/(.*)\";')

# Source: https://stackoverflow.com/a/14822210
def convert_size(size_bytes):
    if size_bytes == 0:
        return '0 B'
    size_name = ('B', 'KiB', 'MiB', 'GiB', 'TiB')
    i = int(math.floor(math.log(size_bytes, 1024)))
    p = math.pow(1024, i)
    s = round(size_bytes / p, 2)
    return '%s %s' % (s, size_name[i])

# Custom errors
class InvalidLinkException(Exception):
    pass
class UnavailableFileException(Exception):
    pass

# Remote file hosted on zippyshare.com
class RemoteFile:

    def __init__(self, url, size, name):
        self.url = url
        self.size = size
        self.name = name

    def open(self):
        r = requests.get(self.url, stream=True, timeout=10)
        return r

def get_file(link):
    # Match link (get subdomain)
    link_match = LINK_PATTERN.match(link)
    if not link_match:
        raise InvalidLinkException('Invalid link')
    subdomain = 'www' + link_match.group(1)

    # Match info (containing hash variables and filename)
    html = requests.get(link_match.group(0), timeout=10)
    info = INFO_PATTERN.findall(html.text)
    if len(info) == 0:
        raise UnavailableFileException('File is unavailable')
    info = info[0]

    # ID
    link_id = info[0]

    # Hash
    h1 = int(info[1])
    h2 = int(info[2])
    h3 = int(info[3])
    h4 = int(info[4])
    h = str(h1 % h2 + h3 % h4)

    # Name
    name = unquote(info[5])

    # Construct url
    url = 'https://' + subdomain + '.zippyshare.com/d/' + link_id + '/' + h + '/' + info[5]

    # Do HEAD request to get content-length header
    head = requests.head(url, timeout=10)
    size = int(head.headers['content-length'])

    return RemoteFile(url, size, name)

def main():
    parser = argparse.ArgumentParser(description='Download files from zippyshare.com')
    parser.add_argument('-d', '--dir', default='./', help='Target download directory')
    parser.add_argument('links', nargs='+', help='zippyshare.com URL')
    args = parser.parse_args()

    # Match links
    links = []
    for link in args.links:
        m = LINK_PATTERN.match(link)
        if not m:
            continue
        links.append(link)
    if len(links) == 0:
        print('No links found!')
        sys.exit(1)

    # Get files
    print('Fetching information...')
    files = []
    for link in links:
        try:
            f = get_file(link)
            files.append(f)
        except InvalidLinkException:
            print("Invalid link: %s" % link)
        except UnavailableFileException:
            print("File unavailable: %s" % link)
        except Exception as e:
            print(e)
            sys.exit(1)

    # Download files
    for file in files:
        print('Downloading "%s" (%s)...' % (file.name, convert_size(file.size)))
        target_file = join(args.dir, file.name)
        with open(target_file, 'wb') as f:
            # Copy bytes
            r = file.open()
            for chunk in r.iter_content(chunk_size=8192):
                if chunk: f.write(chunk)

            # Close
            r.close()
            f.flush()
            f.close()

    print('Download done!')

if __name__ == '__main__':
    main()