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import functools
from django.conf import settings
from jwcrypto import jwk
@functools.lru_cache()
def jwk_from_pem(pem_string):
"""
A cached version of jwcrypto.JWK.from_pem.
Converting from PEM is expensive for large keys such as those using RSA.
"""
return jwk.JWK.from_pem(pem_string.encode("utf-8"))
# @functools.lru_cache
def get_timezone(time_zone):
"""
Return the default time zone as a tzinfo instance.
This is the time zone defined by settings.TIME_ZONE.
"""
try:
import zoneinfo
except ImportError:
import pytz
return pytz.timezone(time_zone)
else:
if getattr(settings, "USE_DEPRECATED_PYTZ", False):
import pytz
return pytz.timezone(time_zone)
return zoneinfo.ZoneInfo(time_zone)
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