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55 lines
1.2 KiB
55 lines
1.2 KiB
6 years ago
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"""
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The `compat` module provides support for backwards compatibility with older
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versions of python, and compatibility wrappers around optional packages.
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"""
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# flake8: noqa
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import sys
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import hmac
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PY3 = sys.version_info[0] == 3
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if PY3:
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string_types = str,
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text_type = str
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binary_type = bytes
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else:
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string_types = basestring,
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text_type = unicode
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binary_type = str
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def timedelta_total_seconds(delta):
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try:
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delta.total_seconds
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except AttributeError:
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# On Python 2.6, timedelta instances do not have
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# a .total_seconds() method.
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total_seconds = delta.days * 24 * 60 * 60 + delta.seconds
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else:
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total_seconds = delta.total_seconds()
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return total_seconds
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try:
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constant_time_compare = hmac.compare_digest
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except AttributeError:
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# Fallback for Python < 2.7
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def constant_time_compare(val1, val2):
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"""
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Returns True if the two strings are equal, False otherwise.
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The time taken is independent of the number of characters that match.
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"""
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if len(val1) != len(val2):
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return False
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result = 0
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for x, y in zip(val1, val2):
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result |= ord(x) ^ ord(y)
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return result == 0
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