bazarr/libs/cloudscraper/interpreters/__init__.py

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2019-05-12 04:44:35 +00:00
import re
import sys
import logging
import abc
if sys.version_info >= (3, 4):
ABC = abc.ABC # noqa
else:
ABC = abc.ABCMeta('ABC', (), {})
##########################################################################################################################################################
BUG_REPORT = 'Cloudflare may have changed their technique, or there may be a bug in the script.'
##########################################################################################################################################################
interpreters = {}
class JavaScriptInterpreter(ABC):
@abc.abstractmethod
def __init__(self, name):
interpreters[name] = self
@classmethod
def dynamicImport(cls, name):
if name not in interpreters:
try:
__import__('{}.{}'.format(cls.__module__, name))
if not isinstance(interpreters.get(name), JavaScriptInterpreter):
raise ImportError('The interpreter was not initialized.')
except ImportError:
logging.error('Unable to load {} interpreter'.format(name))
raise
return interpreters[name]
@abc.abstractmethod
def eval(self, jsEnv, js):
pass
def solveChallenge(self, body, domain):
try:
js = re.search(
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',
body
).group(1)
except Exception:
raise ValueError('Unable to identify Cloudflare IUAM Javascript on website. {}'.format(BUG_REPORT))
js = re.sub(r'\s{2,}', ' ', js, flags=re.MULTILINE | re.DOTALL).replace('\'; 121\'', '')
js += '\na.value;'
jsEnv = '''
String.prototype.italics=function(str) {{return "<i>" + this + "</i>";}};
var document = {{
createElement: function () {{
return {{ firstChild: {{ href: "https://{domain}/" }} }}
}},
getElementById: function () {{
return {{"innerHTML": "{innerHTML}"}};
}}
}};
'''
try:
innerHTML = re.search(
r'<div(?: [^<>]*)? id="([^<>]*?)">([^<>]*?)</div>',
body,
re.MULTILINE | re.DOTALL
)
innerHTML = innerHTML.group(2) if innerHTML else ''
except: # noqa
logging.error('Error extracting Cloudflare IUAM Javascript. {}'.format(BUG_REPORT))
raise
try:
result = self.eval(
re.sub(r'\s{2,}', ' ', jsEnv.format(domain=domain, innerHTML=innerHTML), flags=re.MULTILINE | re.DOTALL),
js
)
float(result)
except Exception:
logging.error('Error executing Cloudflare IUAM Javascript. {}'.format(BUG_REPORT))
raise
return result