mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 08:11:00 +00:00
34 lines
870 B
Python
34 lines
870 B
Python
from __future__ import absolute_import
|
|
|
|
import six
|
|
|
|
|
|
class Masker(object):
|
|
"""
|
|
Data sent from the server must be masked to prevent malicious clients
|
|
from sending data over the wire in predictable patterns.
|
|
|
|
Servers do not have to mask data they send to the client.
|
|
https://tools.ietf.org/html/rfc6455#section-5.3
|
|
"""
|
|
|
|
def __init__(self, key):
|
|
self.key = key
|
|
self.offset = 0
|
|
|
|
def mask(self, offset, data):
|
|
result = bytearray(data)
|
|
for i in range(len(data)):
|
|
if six.PY2:
|
|
result[i] ^= ord(self.key[offset % 4])
|
|
else:
|
|
result[i] ^= self.key[offset % 4]
|
|
offset += 1
|
|
result = bytes(result)
|
|
return result
|
|
|
|
def __call__(self, data):
|
|
ret = self.mask(self.offset, data)
|
|
self.offset += len(ret)
|
|
return ret
|