| # Copyright (C) 2001-2010 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', | |
| 'mktime_tz', | |
| 'parseaddr', | |
| 'parsedate', | |
| 'parsedate_tz', | |
| 'unquote', | |
| ] | |
| import os | |
| import re | |
| import time | |
| import base64 | |
| import random | |
| import socket | |
| import urllib | |
| import warnings | |
| 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): | |
| """Decodes a base64 string. | |
| This function is equivalent to base64.decodestring and it's retained only | |
| for backward compatibility. It used to remove the last \n of the decoded | |
| string, if it had any (see issue 7143). | |
| """ | |
| if not s: | |
| return s | |
| return base64.decodestring(s) | |
| 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) |