SickGear/lib/feedparser/datetimes/rfc822.py

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# Copyright 2010-2023 Kurt McKee <contactme@kurtmckee.org>
# Copyright 2002-2008 Mark Pilgrim
# All rights reserved.
#
# This file is a part of feedparser.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import datetime
timezone_names = {
"ut": 0,
"gmt": 0,
"z": 0,
"adt": -3,
"ast": -4,
"at": -4,
"edt": -4,
"est": -5,
"et": -5,
"cdt": -5,
"cst": -6,
"ct": -6,
"mdt": -6,
"mst": -7,
"mt": -7,
"pdt": -7,
"pst": -8,
"pt": -8,
"a": -1,
"n": 1,
"m": -12,
"y": 12,
"met": 1,
"mest": 2,
}
day_names = {"mon", "tue", "wed", "thu", "fri", "sat", "sun"}
months = {
"jan": 1,
"feb": 2,
"mar": 3,
"apr": 4,
"may": 5,
"jun": 6,
"jul": 7,
"aug": 8,
"sep": 9,
"oct": 10,
"nov": 11,
"dec": 12,
}
def _parse_date_rfc822(date):
"""Parse RFC 822 dates and times
http://tools.ietf.org/html/rfc822#section-5
There are some formatting differences that are accounted for:
1. Years may be two or four digits.
2. The month and day can be swapped.
3. Additional timezone names are supported.
4. A default time and timezone are assumed if only a date is present.
:param str date: a date/time string that will be converted to a time tuple
:returns: a UTC time tuple, or None
:rtype: time.struct_time | None
"""
parts = date.lower().split()
if len(parts) < 5:
# Assume that the time and timezone are missing
parts.extend(("00:00:00", "0000"))
# Remove the day name
if parts[0][:3] in day_names:
parts = parts[1:]
if len(parts) < 5:
# If there are still fewer than five parts, there's not enough
# information to interpret this.
return None
# Handle the day and month name.
month = months.get(parts[1][:3])
try:
day = int(parts[0])
except ValueError:
# Check if the day and month are swapped.
if months.get(parts[0][:3]):
try:
day = int(parts[1])
except ValueError:
return None
month = months.get(parts[0][:3])
else:
return None
if not month:
return None
# Handle the year.
try:
year = int(parts[2])
except ValueError:
return None
# Normalize two-digit years:
# Anything in the 90's is interpreted as 1990 and on.
# Anything 89 or less is interpreted as 2089 or before.
if len(parts[2]) <= 2:
year += (1900, 2000)[year < 90]
# Handle the time (default to 00:00:00).
time_parts = parts[3].split(":")
time_parts.extend(("0",) * (3 - len(time_parts)))
try:
(hour, minute, second) = (int(i) for i in time_parts)
except ValueError:
return None
# Handle the timezone information, if any (default to +0000).
# Strip 'Etc/' from the timezone.
if parts[4].startswith("etc/"):
parts[4] = parts[4][4:]
# Normalize timezones that start with 'gmt':
# GMT-05:00 => -0500
# GMT => GMT
if parts[4].startswith("gmt"):
parts[4] = "".join(parts[4][3:].split(":")) or "gmt"
# Handle timezones like '-0500', '+0500', and 'EST'
if parts[4] and parts[4][0] in ("-", "+"):
try:
if ":" in parts[4]:
timezone_hours = int(parts[4][1:3])
timezone_minutes = int(parts[4][4:])
else:
timezone_hours = int(parts[4][1:3])
timezone_minutes = int(parts[4][3:])
except ValueError:
return None
if parts[4].startswith("-"):
timezone_hours *= -1
timezone_minutes *= -1
else:
timezone_hours = timezone_names.get(parts[4], 0)
timezone_minutes = 0
# Create the datetime object and timezone delta objects
try:
stamp = datetime.datetime(year, month, day, hour, minute, second)
except ValueError:
return None
delta = datetime.timedelta(0, 0, 0, 0, timezone_minutes, timezone_hours)
# Return the date and timestamp in a UTC 9-tuple
try:
return (stamp - delta).utctimetuple()
except (OverflowError, ValueError):
# IronPython throws ValueErrors instead of OverflowErrors
return None