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40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
#
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# Unpacker for eval() based packers, a part of javascript beautifier
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# by Einar Lielmanis <einar@jsbeautifier.org>
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#
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# written by Stefano Sanfilippo <a.little.coder@gmail.com>
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#
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# usage:
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#
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# if detect(some_string):
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# unpacked = unpack(some_string)
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#
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"""Unpacker for eval() based packers: runs JS code and returns result.
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Works only if a JS interpreter (e.g. Mozilla's Rhino) is installed and
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properly set up on host."""
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from subprocess import PIPE, Popen
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PRIORITY = 3
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def detect(source):
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"""Detects if source is likely to be eval() packed."""
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return source.strip().lower().startswith('eval(function(')
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def unpack(source):
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"""Runs source and return resulting code."""
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return jseval('print %s;' % source[4:]) if detect(source) else source
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# In case of failure, we'll just return the original, without crashing on user.
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def jseval(script):
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"""Run code in the JS interpreter and return output."""
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try:
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interpreter = Popen(['js'], stdin=PIPE, stdout=PIPE)
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except OSError:
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return script
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result, errors = interpreter.communicate(script)
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if interpreter.poll() or errors:
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return script
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return result
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