1 files changed, 58 insertions, 0 deletions
diff --git a/mitmproxy/libmproxy/contrib/jsbeautifier/unpackers/javascriptobfuscator.py b/mitmproxy/libmproxy/contrib/jsbeautifier/unpackers/javascriptobfuscator.py
new file mode 100644
index 00000000..aa4344a3
--- /dev/null
+++ b/mitmproxy/libmproxy/contrib/jsbeautifier/unpackers/javascriptobfuscator.py
@@ -0,0 +1,58 @@
+#
+# simple unpacker/deobfuscator for scripts messed up with
+# javascriptobfuscator.com
+#
+#     written by Einar Lielmanis <einar@jsbeautifier.org>
+#     rewritten in Python by Stefano Sanfilippo <a.little.coder@gmail.com>
+#
+# Will always return valid javascript: if `detect()` is false, `code` is
+# returned, unmodified.
+#
+# usage:
+#
+# if javascriptobfuscator.detect(some_string):
+#     some_string = javascriptobfuscator.unpack(some_string)
+#
+
+"""deobfuscator for scripts messed up with JavascriptObfuscator.com"""
+
+import re
+
+PRIORITY = 1
+
+def smartsplit(code):
+    """Split `code` at " symbol, only if it is not escaped."""
+    strings = []
+    pos = 0
+    while pos < len(code):
+        if code[pos] == '"':
+            word = '' # new word
+            pos += 1
+            while pos < len(code):
+                if code[pos] == '"':
+                    break
+                if code[pos] == '\\':
+                    word += '\\'
+                    pos += 1
+                word += code[pos]
+                pos += 1
+            strings.append('"%s"' % word)
+        pos += 1
+    return strings
+
+def detect(code):
+    """Detects if `code` is JavascriptObfuscator.com packed."""
+    # prefer `is not` idiom, so that a true boolean is returned
+    return (re.search(r'^var _0x[a-f0-9]+ ?\= ?\[', code) is not None)
+
+def unpack(code):
+    """Unpacks JavascriptObfuscator.com packed code."""
+    if detect(code):
+        matches = re.search(r'var (_0x[a-f\d]+) ?\= ?\[(.*?)\];', code)
+        if matches:
+            variable = matches.group(1)
+            dictionary = smartsplit(matches.group(2))
+            code = code[len(matches.group(0)):]
+            for key, value in enumerate(dictionary):
+                code = code.replace(r'%s[%s]' % (variable, key), value)
+    return code