243 lines
6.9 KiB
Python
243 lines
6.9 KiB
Python
# Copyright (C) 2001,2002 Python Software Foundation
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# Author: barry@zope.com (Barry Warsaw)
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"""Miscellaneous utilities.
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"""
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import time
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import socket
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import re
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import random
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import os
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import warnings
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from cStringIO import StringIO
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from types import ListType
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from rfc822 import unquote, quote
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from rfc822 import AddressList as _AddressList
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from rfc822 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 rfc822 import parsedate as _parsedate
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from rfc822 import parsedate_tz as _parsedate_tz
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from quopri import decodestring as _qdecode
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import base64
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# Intrapackage imports
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from Encoders import _bencode, _qencode
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COMMASPACE = ', '
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UEMPTYSTRING = u''
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CRLF = '\r\n'
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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 _identity(s):
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return s
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def _bdecode(s):
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if not s:
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return s
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# We can't quite use base64.encodestring() since it tacks on a "courtesy
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# newline". Blech!
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if not s:
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return s
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hasnewline = (s[-1] == '\n')
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value = base64.decodestring(s)
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if not hasnewline and value[-1] == '\n':
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return value[:-1]
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return value
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def fix_eols(s):
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"""Replace all line-ending characters with \r\n."""
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# Fix newlines with no preceding carriage return
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s = re.sub(r'(?<!\r)\n', CRLF, s)
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# Fix carriage returns with no following newline
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s = re.sub(r'\r(?!\n)', CRLF, s)
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return s
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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:.
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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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# For backwards compatibility
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def dump_address_pair(pair):
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warnings.warn('Use email.Utils.formataddr() instead',
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DeprecationWarning, 2)
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return formataddr(pair)
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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.getaddrlist()
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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 decode(s):
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"""Return a decoded string according to RFC 2047, as a unicode string.
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NOTE: This function is deprecated. Use Header.decode_header() instead.
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"""
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warnings.warn('Use Header.decode_header() instead.', DeprecationWarning, 2)
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# Intra-package import here to avoid circular import problems.
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from Header import decode_header
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L = decode_header(s)
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if not isinstance(L, ListType):
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# s wasn't decoded
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return s
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rtn = []
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for atom, charset in L:
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if charset is None:
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rtn.append(atom)
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else:
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# Convert the string to Unicode using the given encoding. Leave
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# Unicode conversion errors to strict.
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rtn.append(unicode(atom, charset))
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# Now that we've decoded everything, we just need to join all the parts
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# together into the final string.
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return UEMPTYSTRING.join(rtn)
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def encode(s, charset='iso-8859-1', encoding='q'):
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"""Encode a string according to RFC 2047."""
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warnings.warn('Use Header.Header.encode() instead.', DeprecationWarning, 2)
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encoding = encoding.lower()
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if encoding == 'q':
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estr = _qencode(s)
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elif encoding == 'b':
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estr = _bencode(s)
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else:
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raise ValueError, 'Illegal encoding code: ' + encoding
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return '=?%s?%s?%s?=' % (charset.lower(), encoding, estr)
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def formatdate(timeval=None, localtime=0):
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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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"""
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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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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):
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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, otherwise an empty string is used.
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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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idhost = socket.getfqdn()
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msgid = '<%s.%s.%s%s@%s>' % (utcdate, pid, randint, idstring, idhost)
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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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