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b53319f509
The quoting of ()s inside quoted strings is allowed by the RFC, but is not needed. There seems to be no reason to add needless escapes.
355 lines
12 KiB
Python
355 lines
12 KiB
Python
# Copyright (C) 2001-2010 Python Software Foundation
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# Author: Barry Warsaw
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# Contact: email-sig@python.org
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"""Miscellaneous utilities."""
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__all__ = [
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'collapse_rfc2231_value',
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'decode_params',
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'decode_rfc2231',
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'encode_rfc2231',
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'formataddr',
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'formatdate',
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'format_datetime',
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'getaddresses',
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'make_msgid',
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'mktime_tz',
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'parseaddr',
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'parsedate',
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'parsedate_tz',
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'parsedate_to_datetime',
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'unquote',
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]
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import os
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import re
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import time
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import base64
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import random
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import socket
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import datetime
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import urllib.parse
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import warnings
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from io import StringIO
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from email._parseaddr import quote
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from email._parseaddr import AddressList as _AddressList
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from email._parseaddr import mktime_tz
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# We need wormarounds for bugs in these methods in older Pythons (see below)
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from email._parseaddr import parsedate as _parsedate
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from email._parseaddr import parsedate_tz as _parsedate_tz
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from email._parseaddr import _parsedate_tz as __parsedate_tz
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from quopri import decodestring as _qdecode
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# Intrapackage imports
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from email.encoders import _bencode, _qencode
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from email.charset import Charset
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COMMASPACE = ', '
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EMPTYSTRING = ''
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UEMPTYSTRING = ''
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CRLF = '\r\n'
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TICK = "'"
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specialsre = re.compile(r'[][\\()<>@,:;".]')
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escapesre = re.compile(r'[\\"]')
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# Helpers
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def formataddr(pair, charset='utf-8'):
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"""The inverse of parseaddr(), this takes a 2-tuple of the form
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(realname, email_address) and returns the string value suitable
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for an RFC 2822 From, To or Cc header.
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If the first element of pair is false, then the second element is
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returned unmodified.
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Optional charset if given is the character set that is used to encode
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realname in case realname is not ASCII safe. Can be an instance of str or
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a Charset-like object which has a header_encode method. Default is
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'utf-8'.
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"""
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name, address = pair
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# The address MUST (per RFC) be ascii, so throw a UnicodeError if it isn't.
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address.encode('ascii')
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if name:
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try:
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name.encode('ascii')
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except UnicodeEncodeError:
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if isinstance(charset, str):
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charset = Charset(charset)
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encoded_name = charset.header_encode(name)
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return "%s <%s>" % (encoded_name, address)
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else:
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quotes = ''
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if specialsre.search(name):
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quotes = '"'
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name = escapesre.sub(r'\\\g<0>', name)
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return '%s%s%s <%s>' % (quotes, name, quotes, address)
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return address
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def getaddresses(fieldvalues):
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"""Return a list of (REALNAME, EMAIL) for each fieldvalue."""
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all = COMMASPACE.join(fieldvalues)
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a = _AddressList(all)
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return a.addresslist
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ecre = re.compile(r'''
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=\? # literal =?
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(?P<charset>[^?]*?) # non-greedy up to the next ? is the charset
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\? # literal ?
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(?P<encoding>[qb]) # either a "q" or a "b", case insensitive
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\? # literal ?
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(?P<atom>.*?) # non-greedy up to the next ?= is the atom
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\?= # literal ?=
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''', re.VERBOSE | re.IGNORECASE)
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def _format_timetuple_and_zone(timetuple, zone):
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return '%s, %02d %s %04d %02d:%02d:%02d %s' % (
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['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'][timetuple[6]],
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timetuple[2],
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['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][timetuple[1] - 1],
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timetuple[0], timetuple[3], timetuple[4], timetuple[5],
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zone)
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def formatdate(timeval=None, localtime=False, usegmt=False):
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"""Returns a date string as specified by RFC 2822, e.g.:
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Fri, 09 Nov 2001 01:08:47 -0000
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Optional timeval if given is a floating point time value as accepted by
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gmtime() and localtime(), otherwise the current time is used.
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Optional localtime is a flag that when True, interprets timeval, and
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returns a date relative to the local timezone instead of UTC, properly
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taking daylight savings time into account.
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Optional argument usegmt means that the timezone is written out as
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an ascii string, not numeric one (so "GMT" instead of "+0000"). This
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is needed for HTTP, and is only used when localtime==False.
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"""
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# Note: we cannot use strftime() because that honors the locale and RFC
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# 2822 requires that day and month names be the English abbreviations.
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if timeval is None:
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timeval = time.time()
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if localtime:
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now = time.localtime(timeval)
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# Calculate timezone offset, based on whether the local zone has
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# daylight savings time, and whether DST is in effect.
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if time.daylight and now[-1]:
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offset = time.altzone
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else:
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offset = time.timezone
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hours, minutes = divmod(abs(offset), 3600)
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# Remember offset is in seconds west of UTC, but the timezone is in
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# minutes east of UTC, so the signs differ.
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if offset > 0:
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sign = '-'
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else:
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sign = '+'
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zone = '%s%02d%02d' % (sign, hours, minutes // 60)
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else:
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now = time.gmtime(timeval)
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# Timezone offset is always -0000
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if usegmt:
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zone = 'GMT'
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else:
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zone = '-0000'
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return _format_timetuple_and_zone(now, zone)
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def format_datetime(dt, usegmt=False):
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"""Turn a datetime into a date string as specified in RFC 2822.
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If usegmt is True, dt must be an aware datetime with an offset of zero. In
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this case 'GMT' will be rendered instead of the normal +0000 required by
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RFC2822. This is to support HTTP headers involving date stamps.
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"""
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now = dt.timetuple()
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if usegmt:
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if dt.tzinfo is None or dt.tzinfo != datetime.timezone.utc:
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raise ValueError("usegmt option requires a UTC datetime")
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zone = 'GMT'
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elif dt.tzinfo is None:
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zone = '-0000'
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else:
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zone = dt.strftime("%z")
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return _format_timetuple_and_zone(now, zone)
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def make_msgid(idstring=None, domain=None):
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"""Returns a string suitable for RFC 2822 compliant Message-ID, e.g:
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<20020201195627.33539.96671@nightshade.la.mastaler.com>
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Optional idstring if given is a string used to strengthen the
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uniqueness of the message id. Optional domain if given provides the
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portion of the message id after the '@'. It defaults to the locally
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defined hostname.
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"""
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timeval = time.time()
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utcdate = time.strftime('%Y%m%d%H%M%S', time.gmtime(timeval))
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pid = os.getpid()
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randint = random.randrange(100000)
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if idstring is None:
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idstring = ''
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else:
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idstring = '.' + idstring
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if domain is None:
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domain = socket.getfqdn()
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msgid = '<%s.%s.%s%s@%s>' % (utcdate, pid, randint, idstring, domain)
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return msgid
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# These functions are in the standalone mimelib version only because they've
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# subsequently been fixed in the latest Python versions. We use this to worm
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# around broken older Pythons.
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def parsedate(data):
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if not data:
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return None
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return _parsedate(data)
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def parsedate_tz(data):
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if not data:
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return None
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return _parsedate_tz(data)
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def parsedate_to_datetime(data):
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if not data:
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return None
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*dtuple, tz = __parsedate_tz(data)
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if tz is None:
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return datetime.datetime(*dtuple[:6])
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return datetime.datetime(*dtuple[:6],
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tzinfo=datetime.timezone(datetime.timedelta(seconds=tz)))
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def parseaddr(addr):
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addrs = _AddressList(addr).addresslist
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if not addrs:
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return '', ''
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return addrs[0]
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# rfc822.unquote() doesn't properly de-backslash-ify in Python pre-2.3.
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def unquote(str):
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"""Remove quotes from a string."""
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if len(str) > 1:
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if str.startswith('"') and str.endswith('"'):
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return str[1:-1].replace('\\\\', '\\').replace('\\"', '"')
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if str.startswith('<') and str.endswith('>'):
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return str[1:-1]
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return str
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# RFC2231-related functions - parameter encoding and decoding
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def decode_rfc2231(s):
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"""Decode string according to RFC 2231"""
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parts = s.split(TICK, 2)
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if len(parts) <= 2:
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return None, None, s
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return parts
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def encode_rfc2231(s, charset=None, language=None):
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"""Encode string according to RFC 2231.
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If neither charset nor language is given, then s is returned as-is. If
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charset is given but not language, the string is encoded using the empty
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string for language.
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"""
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s = urllib.parse.quote(s, safe='', encoding=charset or 'ascii')
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if charset is None and language is None:
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return s
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if language is None:
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language = ''
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return "%s'%s'%s" % (charset, language, s)
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rfc2231_continuation = re.compile(r'^(?P<name>\w+)\*((?P<num>[0-9]+)\*?)?$',
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re.ASCII)
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def decode_params(params):
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"""Decode parameters list according to RFC 2231.
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params is a sequence of 2-tuples containing (param name, string value).
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"""
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# Copy params so we don't mess with the original
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params = params[:]
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new_params = []
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# Map parameter's name to a list of continuations. The values are a
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# 3-tuple of the continuation number, the string value, and a flag
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# specifying whether a particular segment is %-encoded.
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rfc2231_params = {}
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name, value = params.pop(0)
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new_params.append((name, value))
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while params:
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name, value = params.pop(0)
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if name.endswith('*'):
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encoded = True
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else:
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encoded = False
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value = unquote(value)
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mo = rfc2231_continuation.match(name)
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if mo:
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name, num = mo.group('name', 'num')
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if num is not None:
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num = int(num)
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rfc2231_params.setdefault(name, []).append((num, value, encoded))
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else:
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new_params.append((name, '"%s"' % quote(value)))
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if rfc2231_params:
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for name, continuations in rfc2231_params.items():
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value = []
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extended = False
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# Sort by number
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continuations.sort()
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# And now append all values in numerical order, converting
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# %-encodings for the encoded segments. If any of the
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# continuation names ends in a *, then the entire string, after
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# decoding segments and concatenating, must have the charset and
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# language specifiers at the beginning of the string.
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for num, s, encoded in continuations:
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if encoded:
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# Decode as "latin-1", so the characters in s directly
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# represent the percent-encoded octet values.
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# collapse_rfc2231_value treats this as an octet sequence.
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s = urllib.parse.unquote(s, encoding="latin-1")
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extended = True
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value.append(s)
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value = quote(EMPTYSTRING.join(value))
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if extended:
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charset, language, value = decode_rfc2231(value)
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new_params.append((name, (charset, language, '"%s"' % value)))
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else:
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new_params.append((name, '"%s"' % value))
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return new_params
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def collapse_rfc2231_value(value, errors='replace',
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fallback_charset='us-ascii'):
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if not isinstance(value, tuple) or len(value) != 3:
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return unquote(value)
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# While value comes to us as a unicode string, we need it to be a bytes
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# object. We do not want bytes() normal utf-8 decoder, we want a straight
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# interpretation of the string as character bytes.
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charset, language, text = value
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rawbytes = bytes(text, 'raw-unicode-escape')
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try:
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return str(rawbytes, charset, errors)
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except LookupError:
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# charset is not a known codec.
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return unquote(text)
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