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