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47 lines
2.0 KiB
47 lines
2.0 KiB
import base64
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import logging
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import subprocess
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from . import JavaScriptInterpreter
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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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class ChallengeInterpreter(JavaScriptInterpreter):
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def __init__(self):
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super(ChallengeInterpreter, self).__init__('nodejs')
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def eval(self, jsEnv, js):
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try:
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js = 'var atob = function(str) {return Buffer.from(str, "base64").toString("binary");};' \
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'var challenge = atob("%s");' \
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'var context = {atob: atob};' \
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'var options = {filename: "iuam-challenge.js", timeout: 4000};' \
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'var answer = require("vm").runInNewContext(challenge, context, options);' \
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'process.stdout.write(String(answer));' \
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% base64.b64encode('{}{}'.format(jsEnv, js).encode('UTF-8')).decode('ascii')
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return subprocess.check_output(['node', '-e', js])
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except OSError as e:
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if e.errno == 2:
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raise EnvironmentError(
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'Missing Node.js runtime. Node is required and must be in the PATH (check with `node -v`). Your Node binary may be called `nodejs` rather than `node`, '
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'in which case you may need to run `apt-get install nodejs-legacy` on some Debian-based systems. (Please read the cloudscraper'
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' README\'s Dependencies section: https://github.com/VeNoMouS/cloudscraper#dependencies.'
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)
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raise
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except Exception:
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logging.error('Error executing Cloudflare IUAM Javascript. %s' % BUG_REPORT)
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raise
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pass
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ChallengeInterpreter()
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