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Copy pathtime.py
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129 lines (97 loc) · 4 KB
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# -*- coding: utf-8 -*-
# MinIO Python Library for Amazon S3 Compatible Cloud Storage, (C)
# 2020 MinIO, Inc.
#
# 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.
"""Time formatter for S3 APIs."""
from __future__ import absolute_import, annotations
import time as ctime
from datetime import datetime, timezone
try:
from datetime import UTC # type: ignore[attr-defined]
_UTC_IMPORTED = True
except ImportError:
_UTC_IMPORTED = False
from typing import Optional
_WEEK_DAYS = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
_MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
"Nov", "Dec"]
def _to_utc(value: datetime) -> datetime:
"""Convert to UTC time if value is not naive."""
return (
value.astimezone(timezone.utc).replace(tzinfo=None)
if value.tzinfo else value
)
def from_iso8601utc(value: Optional[str]) -> Optional[datetime]:
"""Parse UTC ISO-8601 formatted string to datetime."""
if value is None:
return None
try:
time = datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%fZ")
except ValueError:
time = datetime.strptime(value, "%Y-%m-%dT%H:%M:%SZ")
return time.replace(tzinfo=timezone.utc)
def to_iso8601utc(value: Optional[datetime]) -> Optional[str]:
"""Format datetime into UTC ISO-8601 formatted string."""
if value is None:
return None
value = _to_utc(value)
return (
value.strftime("%Y-%m-%dT%H:%M:%S.") + value.strftime("%f")[:3] + "Z"
)
def from_http_header(value: str) -> datetime:
"""Parse HTTP header date formatted string to datetime."""
if len(value) != 29:
raise ValueError(
f"time data {value} does not match HTTP header format")
if value[0:3] not in _WEEK_DAYS or value[3] != ",":
raise ValueError(
f"time data {value} does not match HTTP header format")
weekday = _WEEK_DAYS.index(value[0:3])
if value[4] != " " or value[7] != " ":
raise ValueError(
f"time data {value} does not match HTTP header format"
)
day = int(value[5:7])
if value[8:11] not in _MONTHS:
raise ValueError(
f"time data {value} does not match HTTP header format")
month = _MONTHS.index(value[8:11])
time = datetime.strptime(value[11:], " %Y %H:%M:%S GMT")
time = time.replace(day=day, month=month+1, tzinfo=timezone.utc)
if weekday != time.weekday():
raise ValueError(
f"time data {value} does not match HTTP header format")
return time
def to_http_header(value: datetime) -> str:
"""Format datatime into HTTP header date formatted string."""
value = _to_utc(value)
weekday = _WEEK_DAYS[value.weekday()]
day = value.strftime(" %d ")
month = _MONTHS[value.month - 1]
suffix = value.strftime(" %Y %H:%M:%S GMT")
return f"{weekday},{day}{month}{suffix}"
def to_amz_date(value: datetime) -> str:
"""Format datetime into AMZ date formatted string."""
return _to_utc(value).strftime("%Y%m%dT%H%M%SZ")
def utcnow() -> datetime:
"""Timezone-aware wrapper to datetime.utcnow()."""
if _UTC_IMPORTED:
return datetime.now(UTC).replace(tzinfo=timezone.utc)
return datetime.utcnow().replace(tzinfo=timezone.utc)
def to_signer_date(value: datetime) -> str:
"""Format datetime into SignatureV4 date formatted string."""
return _to_utc(value).strftime("%Y%m%d")
def to_float(value: datetime) -> float:
"""Convert datetime into float value."""
return ctime.mktime(value.timetuple()) + value.microsecond * 1e-6