mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-29 02:55:52 +00:00
326 lines
12 KiB
Python
326 lines
12 KiB
Python
import logging
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import random
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import re
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import base64
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from copy import deepcopy
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from time import sleep
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from collections import OrderedDict
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from .jsfuck import jsunfuck
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import js2py
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from requests.sessions import Session
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try:
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from requests_toolbelt.utils import dump
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except ImportError:
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pass
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try:
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from urlparse import urlparse
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from urlparse import urlunparse
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except ImportError:
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from urllib.parse import urlparse
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from urllib.parse import urlunparse
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__version__ = "2.0.3"
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# Orignally written by https://github.com/Anorov/cloudflare-scrape
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# Rewritten by VeNoMouS - <venom@gen-x.co.nz> for https://github.com/VeNoMouS/Sick-Beard - 24/3/2018 NZDT
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DEFAULT_USER_AGENTS = [
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"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
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"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/65.0.3325.181 Chrome/65.0.3325.181 Safari/537.36",
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"Mozilla/5.0 (Linux; Android 7.0; Moto G (5) Build/NPPS25.137-93-8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.137 Mobile Safari/537.36",
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"Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B554a Safari/9537.53",
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"Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0",
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"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:59.0) Gecko/20100101 Firefox/59.0",
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"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0",
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]
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BUG_REPORT = """\
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Cloudflare may have changed their technique, or there may be a bug in the script.
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"""
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class CloudflareScraper(Session):
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def __init__(self, *args, **kwargs):
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self.delay = kwargs.pop('delay', 8)
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self.debug = False
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super(CloudflareScraper, self).__init__(*args, **kwargs)
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if 'requests' in self.headers['User-Agent']:
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# Set a random User-Agent if no custom User-Agent has been set
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self.headers['User-Agent'] = random.choice(DEFAULT_USER_AGENTS)
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def set_cloudflare_challenge_delay(self, delay):
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if isinstance(delay, (int, float)) and delay > 0:
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self.delay = delay
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def is_cloudflare_challenge(self, resp):
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if resp.headers.get('Server', '').startswith('cloudflare'):
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if b'why_captcha' in resp.content or b'/cdn-cgi/l/chk_captcha' in resp.content:
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raise ValueError('Captcha')
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return (
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resp.status_code in [429, 503]
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and b"jschl_vc" in resp.content
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and b"jschl_answer" in resp.content
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)
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return False
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def debugRequest(self, req):
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try:
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print (dump.dump_all(req).decode('utf-8'))
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except:
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pass
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def request(self, method, url, *args, **kwargs):
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if not isinstance(self.headers, OrderedDict):
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self.headers = \
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OrderedDict(
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[
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('User-Agent', self.headers['User-Agent']),
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('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'),
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('Accept-Language', 'en-US,en;q=0.5'),
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('Accept-Encoding', 'gzip, deflate'),
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('Connection', 'close'),
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('Upgrade-Insecure-Requests', '1')
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]
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)
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resp = super(CloudflareScraper, self).request(method, url, *args, **kwargs)
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# Debug request
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if self.debug:
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self.debugRequest(resp)
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# Check if Cloudflare anti-bot is on
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if self.is_cloudflare_challenge(resp):
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# Work around if the initial request is not a GET,
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# Superseed with a GET then re-request the orignal METHOD.
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if resp.request.method != 'GET':
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self.request('GET', resp.url)
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resp = self.request(method, url, *args, **kwargs)
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else:
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resp = self.solve_cf_challenge(resp, **kwargs)
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return resp
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def solve_cf_challenge(self, resp, **original_kwargs):
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body = resp.text
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# Cloudflare requires a delay before solving the challenge
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if self.delay == 8:
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try:
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delay = float(re.search(r'submit\(\);\r?\n\s*},\s*([0-9]+)', body).group(1)) / float(1000)
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if isinstance(delay, (int, float)):
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self.delay = delay
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except:
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pass
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sleep(self.delay)
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parsed_url = urlparse(resp.url)
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domain = parsed_url.netloc
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submit_url = '{}://{}/cdn-cgi/l/chk_jschl'.format(parsed_url.scheme, domain)
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cloudflare_kwargs = deepcopy(original_kwargs)
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headers = cloudflare_kwargs.setdefault('headers', OrderedDict({'Referer': resp.url}))
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try:
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params = cloudflare_kwargs.setdefault(
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'params', OrderedDict(
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[
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('s', re.search(r'name="s"\svalue="(?P<s_value>[^"]+)', body).group('s_value')),
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('jschl_vc', re.search(r'name="jschl_vc" value="(\w+)"', body).group(1)),
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('pass', re.search(r'name="pass" value="(.+?)"', body).group(1)),
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]
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)
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)
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except Exception as e:
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# Something is wrong with the page.
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# This may indicate Cloudflare has changed their anti-bot
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# technique. If you see this and are running the latest version,
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# please open a GitHub issue so I can update the code accordingly.
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raise ValueError("Unable to parse Cloudflare anti-bots page: {} {}".format(e.message, BUG_REPORT))
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# Solve the Javascript challenge
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params['jschl_answer'] = self.solve_challenge(body, domain)
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# Requests transforms any request into a GET after a redirect,
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# so the redirect has to be handled manually here to allow for
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# performing other types of requests even as the first request.
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method = resp.request.method
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cloudflare_kwargs['allow_redirects'] = False
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redirect = self.request(method, submit_url, **cloudflare_kwargs)
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redirect_location = urlparse(redirect.headers['Location'])
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if not redirect_location.netloc:
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redirect_url = urlunparse(
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(
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parsed_url.scheme,
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domain,
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redirect_location.path,
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redirect_location.params,
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redirect_location.query,
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redirect_location.fragment
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)
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)
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return self.request(method, redirect_url, **original_kwargs)
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return self.request(method, redirect.headers['Location'], **original_kwargs)
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def solve_challenge(self, body, domain):
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try:
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js = re.search(
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r"setTimeout\(function\(\){\s+(var s,t,o,p,b,r,e,a,k,i,n,g,f.+?\r?\n[\s\S]+?a\.value =.+?)\r?\n",
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body
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).group(1)
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except Exception:
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raise ValueError("Unable to identify Cloudflare IUAM Javascript on website. {}".format(BUG_REPORT))
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js = re.sub(r"a\.value = ((.+).toFixed\(10\))?", r"\1", js)
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js = re.sub(r'(e\s=\sfunction\(s\)\s{.*?};)', '', js, flags=re.DOTALL|re.MULTILINE)
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js = re.sub(r"\s{3,}[a-z](?: = |\.).+", "", js).replace("t.length", str(len(domain)))
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js = js.replace('; 121', '')
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# Strip characters that could be used to exit the string context
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# These characters are not currently used in Cloudflare's arithmetic snippet
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js = re.sub(r"[\n\\']", "", js)
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if 'toFixed' not in js:
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raise ValueError("Error parsing Cloudflare IUAM Javascript challenge. {}".format(BUG_REPORT))
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try:
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jsEnv = """
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var t = "{domain}";
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var g = String.fromCharCode;
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o = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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e = function(s) {{
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s += "==".slice(2 - (s.length & 3));
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var bm, r = "", r1, r2, i = 0;
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for (; i < s.length;) {{
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bm = o.indexOf(s.charAt(i++)) << 18 | o.indexOf(s.charAt(i++)) << 12 | (r1 = o.indexOf(s.charAt(i++))) << 6 | (r2 = o.indexOf(s.charAt(i++)));
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r += r1 === 64 ? g(bm >> 16 & 255) : r2 === 64 ? g(bm >> 16 & 255, bm >> 8 & 255) : g(bm >> 16 & 255, bm >> 8 & 255, bm & 255);
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}}
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return r;
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}};
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function italics (str) {{ return '<i>' + this + '</i>'; }};
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var document = {{
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getElementById: function () {{
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return {{'innerHTML': '{innerHTML}'}};
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}}
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}};
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{js}
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"""
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innerHTML = re.search(
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'<div(?: [^<>]*)? id="([^<>]*?)">([^<>]*?)<\/div>',
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body,
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re.MULTILINE | re.DOTALL
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)
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innerHTML = innerHTML.group(2).replace("'", r"\'") if innerHTML else ""
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js = jsunfuck(jsEnv.format(domain=domain, innerHTML=innerHTML, js=js))
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def atob(s):
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return base64.b64decode('{}'.format(s)).decode('utf-8')
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js2py.disable_pyimport()
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context = js2py.EvalJs({'atob': atob})
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result = context.eval(js)
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except Exception:
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logging.error("Error executing Cloudflare IUAM Javascript. {}".format(BUG_REPORT))
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raise
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try:
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float(result)
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except Exception:
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raise ValueError("Cloudflare IUAM challenge returned unexpected answer. {}".format(BUG_REPORT))
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return result
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@classmethod
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def create_scraper(cls, sess=None, **kwargs):
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"""
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Convenience function for creating a ready-to-go CloudflareScraper object.
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"""
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scraper = cls(**kwargs)
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if sess:
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attrs = ['auth', 'cert', 'cookies', 'headers', 'hooks', 'params', 'proxies', 'data']
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for attr in attrs:
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val = getattr(sess, attr, None)
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if val:
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setattr(scraper, attr, val)
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return scraper
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# Functions for integrating cloudflare-scrape with other applications and scripts
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@classmethod
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def get_tokens(cls, url, user_agent=None, debug=False, **kwargs):
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scraper = cls.create_scraper()
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scraper.debug = debug
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if user_agent:
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scraper.headers['User-Agent'] = user_agent
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try:
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resp = scraper.get(url, **kwargs)
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resp.raise_for_status()
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except Exception as e:
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logging.error("'{}' returned an error. Could not collect tokens.".format(url))
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raise
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domain = urlparse(resp.url).netloc
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cookie_domain = None
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for d in scraper.cookies.list_domains():
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if d.startswith('.') and d in ('.{}'.format(domain)):
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cookie_domain = d
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break
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else:
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raise ValueError("Unable to find Cloudflare cookies. Does the site actually have Cloudflare IUAM (\"I'm Under Attack Mode\") enabled?")
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return (
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{
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'__cfduid': scraper.cookies.get('__cfduid', '', domain=cookie_domain),
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'cf_clearance': scraper.cookies.get('cf_clearance', '', domain=cookie_domain)
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},
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scraper.headers['User-Agent']
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)
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def get_live_tokens(self, domain):
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for d in self.cookies.list_domains():
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if d.startswith(".") and d in ("." + domain):
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cookie_domain = d
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break
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else:
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raise ValueError(
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"Unable to find Cloudflare cookies. Does the site actually have Cloudflare IUAM (\"I'm Under Attack Mode\") enabled?")
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return ({
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"__cfduid": self.cookies.get("__cfduid", "", domain=cookie_domain),
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"cf_clearance": self.cookies.get("cf_clearance", "", domain=cookie_domain)
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},
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self.headers["User-Agent"]
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)
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@classmethod
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def get_cookie_string(cls, url, user_agent=None, debug=False, **kwargs):
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"""
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Convenience function for building a Cookie HTTP header value.
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"""
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tokens, user_agent = cls.get_tokens(url, user_agent=user_agent, debug=debug, **kwargs)
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return "; ".join("=".join(pair) for pair in tokens.items()), user_agent
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create_scraper = CloudflareScraper.create_scraper
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get_tokens = CloudflareScraper.get_tokens
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get_cookie_string = CloudflareScraper.get_cookie_string
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