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