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