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# Copyright 2017 Canonical Ltd.
# Licensed under the LGPLv3, see LICENCE file for details.
from macaroonbakery.checkers.auth_context import ContextKey
TIME_KEY = ContextKey('time-key')
def context_with_clock(ctx, clock):
''' Returns a copy of ctx with a key added that associates it with the given
clock implementation, which will be used by the time-before checker
to determine the current time.
The clock should have a utcnow method that returns the current time
as a datetime value in UTC.
'''
if clock is None:
return ctx
return ctx.with_value(TIME_KEY, clock)
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