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- Added ISO 8601 date/time format. git-svn-id: https://fail2ban.svn.sourceforge.net/svnroot/fail2ban/trunk@694 a942ae1a-1317-0410-a47c-b1dcaea8d6050.x
Cyril Jaquier
17 years ago
5 changed files with 180 additions and 2 deletions
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# Copyright (c) 2007 Michael Twomey |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a |
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# copy of this software and associated documentation files (the |
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# "Software"), to deal in the Software without restriction, including |
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# without limitation the rights to use, copy, modify, merge, publish, |
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# distribute, sublicense, and/or sell copies of the Software, and to |
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# permit persons to whom the Software is furnished to do so, subject to |
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# the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included |
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# in all copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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"""ISO 8601 date time string parsing |
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Basic usage: |
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>>> import iso8601 |
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>>> iso8601.parse_date("2007-01-25T12:00:00Z") |
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datetime.datetime(2007, 1, 25, 12, 0, tzinfo=<iso8601.iso8601.Utc ...>) |
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>>> |
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""" |
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from datetime import datetime, timedelta, tzinfo |
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import re |
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__all__ = ["parse_date", "ParseError"] |
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# Adapted from http://delete.me.uk/2005/03/iso8601.html |
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ISO8601_REGEX = re.compile(r"(?P<year>[0-9]{4})(-(?P<month>[0-9]{1,2})(-(?P<day>[0-9]{1,2})" |
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r"((?P<separator>.)(?P<hour>[0-9]{2}):(?P<minute>[0-9]{2})(:(?P<second>[0-9]{2})(\.(?P<fraction>[0-9]+))?)?" |
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r"(?P<timezone>Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?" |
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) |
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TIMEZONE_REGEX = re.compile("(?P<prefix>[+-])(?P<hours>[0-9]{2}).(?P<minutes>[0-9]{2})") |
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class ParseError(Exception): |
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"""Raised when there is a problem parsing a date string""" |
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# Yoinked from python docs |
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ZERO = timedelta(0) |
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class Utc(tzinfo): |
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"""UTC |
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""" |
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def utcoffset(self, dt): |
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return ZERO |
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def tzname(self, dt): |
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return "UTC" |
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def dst(self, dt): |
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return ZERO |
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UTC = Utc() |
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class FixedOffset(tzinfo): |
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"""Fixed offset in hours and minutes from UTC |
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""" |
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def __init__(self, offset_hours, offset_minutes, name): |
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self.__offset = timedelta(hours=offset_hours, minutes=offset_minutes) |
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self.__name = name |
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def utcoffset(self, dt): |
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return self.__offset |
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def tzname(self, dt): |
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return self.__name |
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def dst(self, dt): |
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return ZERO |
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def __repr__(self): |
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return "<FixedOffset %r>" % self.__name |
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def parse_timezone(tzstring, default_timezone=UTC): |
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"""Parses ISO 8601 time zone specs into tzinfo offsets |
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""" |
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if tzstring == "Z": |
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return default_timezone |
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# This isn't strictly correct, but it's common to encounter dates without |
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# timezones so I'll assume the default (which defaults to UTC). |
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# Addresses issue 4. |
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if tzstring is None: |
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return default_timezone |
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m = TIMEZONE_REGEX.match(tzstring) |
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prefix, hours, minutes = m.groups() |
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hours, minutes = int(hours), int(minutes) |
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if prefix == "-": |
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hours = -hours |
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minutes = -minutes |
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return FixedOffset(hours, minutes, tzstring) |
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def parse_date(datestring, default_timezone=UTC): |
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"""Parses ISO 8601 dates into datetime objects |
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The timezone is parsed from the date string. However it is quite common to |
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have dates without a timezone (not strictly correct). In this case the |
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default timezone specified in default_timezone is used. This is UTC by |
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default. |
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""" |
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if not isinstance(datestring, basestring): |
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raise ParseError("Expecting a string %r" % datestring) |
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m = ISO8601_REGEX.match(datestring) |
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if not m: |
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raise ParseError("Unable to parse date string %r" % datestring) |
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groups = m.groupdict() |
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tz = parse_timezone(groups["timezone"], default_timezone=default_timezone) |
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if groups["fraction"] is None: |
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groups["fraction"] = 0 |
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else: |
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groups["fraction"] = int(float("0.%s" % groups["fraction"]) * 1e6) |
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return datetime(int(groups["year"]), int(groups["month"]), int(groups["day"]), |
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int(groups["hour"]), int(groups["minute"]), int(groups["second"]), |
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int(groups["fraction"]), tz) |
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