mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-12-18 00:41:11 +00:00
40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
#
|
|
# Unpacker for eval() based packers, a part of javascript beautifier
|
|
# by Einar Lielmanis <einar@jsbeautifier.org>
|
|
#
|
|
# written by Stefano Sanfilippo <a.little.coder@gmail.com>
|
|
#
|
|
# usage:
|
|
#
|
|
# if detect(some_string):
|
|
# unpacked = unpack(some_string)
|
|
#
|
|
|
|
"""Unpacker for eval() based packers: runs JS code and returns result.
|
|
Works only if a JS interpreter (e.g. Mozilla's Rhino) is installed and
|
|
properly set up on host."""
|
|
|
|
from subprocess import PIPE, Popen
|
|
|
|
PRIORITY = 3
|
|
|
|
def detect(source):
|
|
"""Detects if source is likely to be eval() packed."""
|
|
return source.strip().lower().startswith('eval(function(')
|
|
|
|
def unpack(source):
|
|
"""Runs source and return resulting code."""
|
|
return jseval('print %s;' % source[4:]) if detect(source) else source
|
|
|
|
# In case of failure, we'll just return the original, without crashing on user.
|
|
def jseval(script):
|
|
"""Run code in the JS interpreter and return output."""
|
|
try:
|
|
interpreter = Popen(['js'], stdin=PIPE, stdout=PIPE)
|
|
except OSError:
|
|
return script
|
|
result, errors = interpreter.communicate(script)
|
|
if interpreter.poll() or errors:
|
|
return script
|
|
return result
|