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306 lines
9.6 KiB
Python
306 lines
9.6 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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'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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'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 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 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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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):
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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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"""
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name, address = pair
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if name:
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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 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 '%s, %02d %s %04d %02d:%02d:%02d %s' % (
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['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'][now[6]],
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now[2],
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['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][now[1] - 1],
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now[0], now[3], now[4], now[5],
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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 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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