2363d6de43
git-svn-id: http://google-refine.googlecode.com/svn/trunk@517 7d457c2a-affb-35e4-300a-418c747d4874
324 lines
9.6 KiB
Python
324 lines
9.6 KiB
Python
# Copyright (C) 2001-2006 Python Software Foundation
|
||
# Author: Barry Warsaw
|
||
# Contact: email-sig@python.org
|
||
|
||
"""Miscellaneous utilities."""
|
||
|
||
__all__ = [
|
||
'collapse_rfc2231_value',
|
||
'decode_params',
|
||
'decode_rfc2231',
|
||
'encode_rfc2231',
|
||
'formataddr',
|
||
'formatdate',
|
||
'getaddresses',
|
||
'make_msgid',
|
||
'parseaddr',
|
||
'parsedate',
|
||
'parsedate_tz',
|
||
'unquote',
|
||
]
|
||
|
||
import os
|
||
import re
|
||
import time
|
||
import base64
|
||
import random
|
||
import socket
|
||
import urllib
|
||
import warnings
|
||
from cStringIO import StringIO
|
||
|
||
from email._parseaddr import quote
|
||
from email._parseaddr import AddressList as _AddressList
|
||
from email._parseaddr import mktime_tz
|
||
|
||
# We need wormarounds for bugs in these methods in older Pythons (see below)
|
||
from email._parseaddr import parsedate as _parsedate
|
||
from email._parseaddr import parsedate_tz as _parsedate_tz
|
||
|
||
from quopri import decodestring as _qdecode
|
||
|
||
# Intrapackage imports
|
||
from email.encoders import _bencode, _qencode
|
||
|
||
COMMASPACE = ', '
|
||
EMPTYSTRING = ''
|
||
UEMPTYSTRING = u''
|
||
CRLF = '\r\n'
|
||
TICK = "'"
|
||
|
||
specialsre = re.compile(r'[][\\()<>@,:;".]')
|
||
escapesre = re.compile(r'[][\\()"]')
|
||
|
||
|
||
|
||
# Helpers
|
||
|
||
def _identity(s):
|
||
return s
|
||
|
||
|
||
def _bdecode(s):
|
||
# We can't quite use base64.encodestring() since it tacks on a "courtesy
|
||
# newline". Blech!
|
||
if not s:
|
||
return s
|
||
value = base64.decodestring(s)
|
||
if not s.endswith('\n') and value.endswith('\n'):
|
||
return value[:-1]
|
||
return value
|
||
|
||
|
||
|
||
def fix_eols(s):
|
||
"""Replace all line-ending characters with \r\n."""
|
||
# Fix newlines with no preceding carriage return
|
||
s = re.sub(r'(?<!\r)\n', CRLF, s)
|
||
# Fix carriage returns with no following newline
|
||
s = re.sub(r'\r(?!\n)', CRLF, s)
|
||
return s
|
||
|
||
|
||
|
||
def formataddr(pair):
|
||
"""The inverse of parseaddr(), this takes a 2-tuple of the form
|
||
(realname, email_address) and returns the string value suitable
|
||
for an RFC 2822 From, To or Cc header.
|
||
|
||
If the first element of pair is false, then the second element is
|
||
returned unmodified.
|
||
"""
|
||
name, address = pair
|
||
if name:
|
||
quotes = ''
|
||
if specialsre.search(name):
|
||
quotes = '"'
|
||
name = escapesre.sub(r'\\\g<0>', name)
|
||
return '%s%s%s <%s>' % (quotes, name, quotes, address)
|
||
return address
|
||
|
||
|
||
|
||
def getaddresses(fieldvalues):
|
||
"""Return a list of (REALNAME, EMAIL) for each fieldvalue."""
|
||
all = COMMASPACE.join(fieldvalues)
|
||
a = _AddressList(all)
|
||
return a.addresslist
|
||
|
||
|
||
|
||
ecre = re.compile(r'''
|
||
=\? # literal =?
|
||
(?P<charset>[^?]*?) # non-greedy up to the next ? is the charset
|
||
\? # literal ?
|
||
(?P<encoding>[qb]) # either a "q" or a "b", case insensitive
|
||
\? # literal ?
|
||
(?P<atom>.*?) # non-greedy up to the next ?= is the atom
|
||
\?= # literal ?=
|
||
''', re.VERBOSE | re.IGNORECASE)
|
||
|
||
|
||
|
||
def formatdate(timeval=None, localtime=False, usegmt=False):
|
||
"""Returns a date string as specified by RFC 2822, e.g.:
|
||
|
||
Fri, 09 Nov 2001 01:08:47 -0000
|
||
|
||
Optional timeval if given is a floating point time value as accepted by
|
||
gmtime() and localtime(), otherwise the current time is used.
|
||
|
||
Optional localtime is a flag that when True, interprets timeval, and
|
||
returns a date relative to the local timezone instead of UTC, properly
|
||
taking daylight savings time into account.
|
||
|
||
Optional argument usegmt means that the timezone is written out as
|
||
an ascii string, not numeric one (so "GMT" instead of "+0000"). This
|
||
is needed for HTTP, and is only used when localtime==False.
|
||
"""
|
||
# Note: we cannot use strftime() because that honors the locale and RFC
|
||
# 2822 requires that day and month names be the English abbreviations.
|
||
if timeval is None:
|
||
timeval = time.time()
|
||
if localtime:
|
||
now = time.localtime(timeval)
|
||
# Calculate timezone offset, based on whether the local zone has
|
||
# daylight savings time, and whether DST is in effect.
|
||
if time.daylight and now[-1]:
|
||
offset = time.altzone
|
||
else:
|
||
offset = time.timezone
|
||
hours, minutes = divmod(abs(offset), 3600)
|
||
# Remember offset is in seconds west of UTC, but the timezone is in
|
||
# minutes east of UTC, so the signs differ.
|
||
if offset > 0:
|
||
sign = '-'
|
||
else:
|
||
sign = '+'
|
||
zone = '%s%02d%02d' % (sign, hours, minutes // 60)
|
||
else:
|
||
now = time.gmtime(timeval)
|
||
# Timezone offset is always -0000
|
||
if usegmt:
|
||
zone = 'GMT'
|
||
else:
|
||
zone = '-0000'
|
||
return '%s, %02d %s %04d %02d:%02d:%02d %s' % (
|
||
['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'][now[6]],
|
||
now[2],
|
||
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
|
||
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][now[1] - 1],
|
||
now[0], now[3], now[4], now[5],
|
||
zone)
|
||
|
||
|
||
|
||
def make_msgid(idstring=None):
|
||
"""Returns a string suitable for RFC 2822 compliant Message-ID, e.g:
|
||
|
||
<20020201195627.33539.96671@nightshade.la.mastaler.com>
|
||
|
||
Optional idstring if given is a string used to strengthen the
|
||
uniqueness of the message id.
|
||
"""
|
||
timeval = time.time()
|
||
utcdate = time.strftime('%Y%m%d%H%M%S', time.gmtime(timeval))
|
||
pid = os.getpid()
|
||
randint = random.randrange(100000)
|
||
if idstring is None:
|
||
idstring = ''
|
||
else:
|
||
idstring = '.' + idstring
|
||
idhost = socket.getfqdn()
|
||
msgid = '<%s.%s.%s%s@%s>' % (utcdate, pid, randint, idstring, idhost)
|
||
return msgid
|
||
|
||
|
||
|
||
# These functions are in the standalone mimelib version only because they've
|
||
# subsequently been fixed in the latest Python versions. We use this to worm
|
||
# around broken older Pythons.
|
||
def parsedate(data):
|
||
if not data:
|
||
return None
|
||
return _parsedate(data)
|
||
|
||
|
||
def parsedate_tz(data):
|
||
if not data:
|
||
return None
|
||
return _parsedate_tz(data)
|
||
|
||
|
||
def parseaddr(addr):
|
||
addrs = _AddressList(addr).addresslist
|
||
if not addrs:
|
||
return '', ''
|
||
return addrs[0]
|
||
|
||
|
||
# rfc822.unquote() doesn't properly de-backslash-ify in Python pre-2.3.
|
||
def unquote(str):
|
||
"""Remove quotes from a string."""
|
||
if len(str) > 1:
|
||
if str.startswith('"') and str.endswith('"'):
|
||
return str[1:-1].replace('\\\\', '\\').replace('\\"', '"')
|
||
if str.startswith('<') and str.endswith('>'):
|
||
return str[1:-1]
|
||
return str
|
||
|
||
|
||
|
||
# RFC2231-related functions - parameter encoding and decoding
|
||
def decode_rfc2231(s):
|
||
"""Decode string according to RFC 2231"""
|
||
parts = s.split(TICK, 2)
|
||
if len(parts) <= 2:
|
||
return None, None, s
|
||
return parts
|
||
|
||
|
||
def encode_rfc2231(s, charset=None, language=None):
|
||
"""Encode string according to RFC 2231.
|
||
|
||
If neither charset nor language is given, then s is returned as-is. If
|
||
charset is given but not language, the string is encoded using the empty
|
||
string for language.
|
||
"""
|
||
import urllib
|
||
s = urllib.quote(s, safe='')
|
||
if charset is None and language is None:
|
||
return s
|
||
if language is None:
|
||
language = ''
|
||
return "%s'%s'%s" % (charset, language, s)
|
||
|
||
|
||
rfc2231_continuation = re.compile(r'^(?P<name>\w+)\*((?P<num>[0-9]+)\*?)?$')
|
||
|
||
def decode_params(params):
|
||
"""Decode parameters list according to RFC 2231.
|
||
|
||
params is a sequence of 2-tuples containing (param name, string value).
|
||
"""
|
||
# Copy params so we don't mess with the original
|
||
params = params[:]
|
||
new_params = []
|
||
# Map parameter's name to a list of continuations. The values are a
|
||
# 3-tuple of the continuation number, the string value, and a flag
|
||
# specifying whether a particular segment is %-encoded.
|
||
rfc2231_params = {}
|
||
name, value = params.pop(0)
|
||
new_params.append((name, value))
|
||
while params:
|
||
name, value = params.pop(0)
|
||
if name.endswith('*'):
|
||
encoded = True
|
||
else:
|
||
encoded = False
|
||
value = unquote(value)
|
||
mo = rfc2231_continuation.match(name)
|
||
if mo:
|
||
name, num = mo.group('name', 'num')
|
||
if num is not None:
|
||
num = int(num)
|
||
rfc2231_params.setdefault(name, []).append((num, value, encoded))
|
||
else:
|
||
new_params.append((name, '"%s"' % quote(value)))
|
||
if rfc2231_params:
|
||
for name, continuations in rfc2231_params.items():
|
||
value = []
|
||
extended = False
|
||
# Sort by number
|
||
continuations.sort()
|
||
# And now append all values in numerical order, converting
|
||
# %-encodings for the encoded segments. If any of the
|
||
# continuation names ends in a *, then the entire string, after
|
||
# decoding segments and concatenating, must have the charset and
|
||
# language specifiers at the beginning of the string.
|
||
for num, s, encoded in continuations:
|
||
if encoded:
|
||
s = urllib.unquote(s)
|
||
extended = True
|
||
value.append(s)
|
||
value = quote(EMPTYSTRING.join(value))
|
||
if extended:
|
||
charset, language, value = decode_rfc2231(value)
|
||
new_params.append((name, (charset, language, '"%s"' % value)))
|
||
else:
|
||
new_params.append((name, '"%s"' % value))
|
||
return new_params
|
||
|
||
def collapse_rfc2231_value(value, errors='replace',
|
||
fallback_charset='us-ascii'):
|
||
if isinstance(value, tuple):
|
||
rawval = unquote(value[2])
|
||
charset = value[0] or 'us-ascii'
|
||
try:
|
||
return unicode(rawval, charset, errors)
|
||
except LookupError:
|
||
# XXX charset is unknown to Python.
|
||
return unicode(rawval, fallback_charset, errors)
|
||
else:
|
||
return unquote(value)
|