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# Copyright 2017 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import datetime
import math
import re
class TimezoneInfo(datetime.tzinfo):
def __init__(self, h, m):
self._name = "UTC"
if h != 0 and m != 0:
self._name += "%+03d:%2d" % (h, m)
self._delta = datetime.timedelta(hours=h, minutes=math.copysign(m, h))
def utcoffset(self, dt):
return self._delta
def tzname(self, dt):
return self._name
def dst(self, dt):
return datetime.timedelta(0)
UTC = TimezoneInfo(0, 0)
# ref https://www.ietf.org/rfc/rfc3339.txt
_re_rfc3339 = re.compile(r"(\d\d\d\d)-(\d\d)-(\d\d)" # full-date
r"[ Tt]" # Separator
r"(\d\d):(\d\d):(\d\d)([.,]\d+)?" # partial-time
r"([zZ ]|[-+]\d\d?:\d\d)?", # time-offset
re.VERBOSE + re.IGNORECASE)
_re_timezone = re.compile(r"([-+])(\d\d?):?(\d\d)?")
MICROSEC_PER_SEC = 1000000
def parse_rfc3339(s):
if isinstance(s, datetime.datetime):
# no need to parse it, just make sure it has a timezone.
if not s.tzinfo:
return s.replace(tzinfo=UTC)
return s
groups = _re_rfc3339.search(s).groups()
dt = [0] * 7
for x in range(6):
dt[x] = int(groups[x])
us = 0
if groups[6] is not None:
partial_sec = float(groups[6].replace(",", "."))
us = int(MICROSEC_PER_SEC * partial_sec)
tz = UTC
if groups[7] is not None and groups[7] != 'Z' and groups[7] != 'z':
tz_groups = _re_timezone.search(groups[7]).groups()
hour = int(tz_groups[1])
minute = 0
if tz_groups[0] == "-":
hour *= -1
if tz_groups[2]:
minute = int(tz_groups[2])
tz = TimezoneInfo(hour, minute)
return datetime.datetime(
year=dt[0], month=dt[1], day=dt[2],
hour=dt[3], minute=dt[4], second=dt[5],
microsecond=us, tzinfo=tz)
def format_rfc3339(date_time):
if date_time.tzinfo is None:
date_time = date_time.replace(tzinfo=UTC)
date_time = date_time.astimezone(UTC)
return date_time.strftime('%Y-%m-%dT%H:%M:%SZ')
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