15 lines
277 B
Python
15 lines
277 B
Python
import itertools
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__all__ = ['apply_mask']
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def apply_mask(data, mask):
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"""
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Apply masking to websocket message.
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"""
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if len(mask) != 4:
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raise ValueError("mask must contain 4 bytes")
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return bytes(b ^ m for b, m in zip(data, itertools.cycle(mask)))
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