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511 lines
16 KiB
Python
511 lines
16 KiB
Python
# Copyright (C) 2002-2007 Python Software Foundation
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# Contact: email-sig@python.org
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"""Email address parsing code.
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Lifted directly from rfc822.py. This should eventually be rewritten.
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"""
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__all__ = [
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'mktime_tz',
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'parsedate',
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'parsedate_tz',
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'quote',
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]
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import time
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SPACE = ' '
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EMPTYSTRING = ''
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COMMASPACE = ', '
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# Parse a date field
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_monthnames = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul',
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'aug', 'sep', 'oct', 'nov', 'dec',
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'january', 'february', 'march', 'april', 'may', 'june', 'july',
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'august', 'september', 'october', 'november', 'december']
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_daynames = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
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# The timezone table does not include the military time zones defined
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# in RFC822, other than Z. According to RFC1123, the description in
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# RFC822 gets the signs wrong, so we can't rely on any such time
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# zones. RFC1123 recommends that numeric timezone indicators be used
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# instead of timezone names.
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_timezones = {'UT':0, 'UTC':0, 'GMT':0, 'Z':0,
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'AST': -400, 'ADT': -300, # Atlantic (used in Canada)
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'EST': -500, 'EDT': -400, # Eastern
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'CST': -600, 'CDT': -500, # Central
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'MST': -700, 'MDT': -600, # Mountain
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'PST': -800, 'PDT': -700 # Pacific
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}
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def parsedate_tz(data):
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"""Convert a date string to a time tuple.
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Accounts for military timezones.
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"""
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data = data.split()
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# The FWS after the comma after the day-of-week is optional, so search and
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# adjust for this.
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if data[0].endswith(',') or data[0].lower() in _daynames:
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# There's a dayname here. Skip it
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del data[0]
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else:
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i = data[0].rfind(',')
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if i >= 0:
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data[0] = data[0][i+1:]
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if len(data) == 3: # RFC 850 date, deprecated
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stuff = data[0].split('-')
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if len(stuff) == 3:
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data = stuff + data[1:]
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if len(data) == 4:
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s = data[3]
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i = s.find('+')
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if i == -1:
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i = s.find('-')
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if i > 0:
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data[3:] = [s[:i], s[i:]]
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else:
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data.append('') # Dummy tz
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if len(data) < 5:
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return None
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data = data[:5]
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[dd, mm, yy, tm, tz] = data
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mm = mm.lower()
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if mm not in _monthnames:
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dd, mm = mm, dd.lower()
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if mm not in _monthnames:
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return None
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mm = _monthnames.index(mm) + 1
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if mm > 12:
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mm -= 12
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if dd[-1] == ',':
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dd = dd[:-1]
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i = yy.find(':')
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if i > 0:
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yy, tm = tm, yy
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if yy[-1] == ',':
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yy = yy[:-1]
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if not yy[0].isdigit():
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yy, tz = tz, yy
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if tm[-1] == ',':
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tm = tm[:-1]
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tm = tm.split(':')
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if len(tm) == 2:
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[thh, tmm] = tm
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tss = '0'
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elif len(tm) == 3:
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[thh, tmm, tss] = tm
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else:
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return None
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try:
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yy = int(yy)
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dd = int(dd)
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thh = int(thh)
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tmm = int(tmm)
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tss = int(tss)
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except ValueError:
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return None
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# Check for a yy specified in two-digit format, then convert it to the
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# appropriate four-digit format, according to the POSIX standard. RFC 822
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# calls for a two-digit yy, but RFC 2822 (which obsoletes RFC 822)
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# mandates a 4-digit yy. For more information, see the documentation for
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# the time module.
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if yy < 100:
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# The year is between 1969 and 1999 (inclusive).
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if yy > 68:
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yy += 1900
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# The year is between 2000 and 2068 (inclusive).
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else:
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yy += 2000
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tzoffset = None
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tz = tz.upper()
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if tz in _timezones:
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tzoffset = _timezones[tz]
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else:
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try:
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tzoffset = int(tz)
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except ValueError:
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pass
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# Convert a timezone offset into seconds ; -0500 -> -18000
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if tzoffset:
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if tzoffset < 0:
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tzsign = -1
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tzoffset = -tzoffset
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else:
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tzsign = 1
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tzoffset = tzsign * ( (tzoffset//100)*3600 + (tzoffset % 100)*60)
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# Daylight Saving Time flag is set to -1, since DST is unknown.
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return yy, mm, dd, thh, tmm, tss, 0, 1, -1, tzoffset
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def parsedate(data):
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"""Convert a time string to a time tuple."""
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t = parsedate_tz(data)
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if isinstance(t, tuple):
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return t[:9]
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else:
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return t
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def mktime_tz(data):
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"""Turn a 10-tuple as returned by parsedate_tz() into a UTC timestamp."""
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if data[9] is None:
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# No zone info, so localtime is better assumption than GMT
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return time.mktime(data[:8] + (-1,))
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else:
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t = time.mktime(data[:8] + (0,))
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return t - data[9] - time.timezone
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def quote(str):
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"""Prepare string to be used in a quoted string.
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Turns backslash and double quote characters into quoted pairs. These
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are the only characters that need to be quoted inside a quoted string.
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Does not add the surrounding double quotes.
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"""
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return str.replace('\\', '\\\\').replace('"', '\\"')
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class AddrlistClass:
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"""Address parser class by Ben Escoto.
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To understand what this class does, it helps to have a copy of RFC 2822 in
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front of you.
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Note: this class interface is deprecated and may be removed in the future.
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Use rfc822.AddressList instead.
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"""
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def __init__(self, field):
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"""Initialize a new instance.
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`field' is an unparsed address header field, containing
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one or more addresses.
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"""
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self.specials = '()<>@,:;.\"[]'
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self.pos = 0
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self.LWS = ' \t'
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self.CR = '\r\n'
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self.FWS = self.LWS + self.CR
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self.atomends = self.specials + self.LWS + self.CR
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# Note that RFC 2822 now specifies `.' as obs-phrase, meaning that it
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# is obsolete syntax. RFC 2822 requires that we recognize obsolete
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# syntax, so allow dots in phrases.
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self.phraseends = self.atomends.replace('.', '')
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self.field = field
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self.commentlist = []
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def gotonext(self):
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"""Skip white space and extract comments."""
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wslist = []
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while self.pos < len(self.field):
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if self.field[self.pos] in self.LWS + '\n\r':
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if self.field[self.pos] not in '\n\r':
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wslist.append(self.field[self.pos])
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self.pos += 1
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elif self.field[self.pos] == '(':
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self.commentlist.append(self.getcomment())
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else:
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break
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return EMPTYSTRING.join(wslist)
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def getaddrlist(self):
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"""Parse all addresses.
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Returns a list containing all of the addresses.
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"""
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result = []
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while self.pos < len(self.field):
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ad = self.getaddress()
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if ad:
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result += ad
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else:
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result.append(('', ''))
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return result
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def getaddress(self):
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"""Parse the next address."""
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self.commentlist = []
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self.gotonext()
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oldpos = self.pos
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oldcl = self.commentlist
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plist = self.getphraselist()
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self.gotonext()
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returnlist = []
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if self.pos >= len(self.field):
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# Bad email address technically, no domain.
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if plist:
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returnlist = [(SPACE.join(self.commentlist), plist[0])]
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elif self.field[self.pos] in '.@':
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# email address is just an addrspec
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# this isn't very efficient since we start over
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self.pos = oldpos
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self.commentlist = oldcl
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addrspec = self.getaddrspec()
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returnlist = [(SPACE.join(self.commentlist), addrspec)]
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elif self.field[self.pos] == ':':
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# address is a group
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returnlist = []
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fieldlen = len(self.field)
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self.pos += 1
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while self.pos < len(self.field):
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self.gotonext()
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if self.pos < fieldlen and self.field[self.pos] == ';':
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self.pos += 1
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break
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returnlist = returnlist + self.getaddress()
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elif self.field[self.pos] == '<':
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# Address is a phrase then a route addr
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routeaddr = self.getrouteaddr()
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if self.commentlist:
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returnlist = [(SPACE.join(plist) + ' (' +
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' '.join(self.commentlist) + ')', routeaddr)]
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else:
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returnlist = [(SPACE.join(plist), routeaddr)]
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else:
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if plist:
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returnlist = [(SPACE.join(self.commentlist), plist[0])]
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elif self.field[self.pos] in self.specials:
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self.pos += 1
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self.gotonext()
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if self.pos < len(self.field) and self.field[self.pos] == ',':
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self.pos += 1
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return returnlist
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def getrouteaddr(self):
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"""Parse a route address (Return-path value).
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This method just skips all the route stuff and returns the addrspec.
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"""
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if self.field[self.pos] != '<':
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return
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expectroute = False
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self.pos += 1
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self.gotonext()
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adlist = ''
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while self.pos < len(self.field):
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if expectroute:
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self.getdomain()
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expectroute = False
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elif self.field[self.pos] == '>':
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self.pos += 1
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break
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elif self.field[self.pos] == '@':
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self.pos += 1
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expectroute = True
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elif self.field[self.pos] == ':':
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self.pos += 1
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else:
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adlist = self.getaddrspec()
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self.pos += 1
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break
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self.gotonext()
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return adlist
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def getaddrspec(self):
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"""Parse an RFC 2822 addr-spec."""
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aslist = []
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self.gotonext()
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while self.pos < len(self.field):
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preserve_ws = True
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if self.field[self.pos] == '.':
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if aslist and not aslist[-1].strip():
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aslist.pop()
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aslist.append('.')
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self.pos += 1
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preserve_ws = False
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elif self.field[self.pos] == '"':
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aslist.append('"%s"' % quote(self.getquote()))
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elif self.field[self.pos] in self.atomends:
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if aslist and not aslist[-1].strip():
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aslist.pop()
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break
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else:
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aslist.append(self.getatom())
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ws = self.gotonext()
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if preserve_ws and ws:
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aslist.append(ws)
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if self.pos >= len(self.field) or self.field[self.pos] != '@':
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return EMPTYSTRING.join(aslist)
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aslist.append('@')
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self.pos += 1
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self.gotonext()
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return EMPTYSTRING.join(aslist) + self.getdomain()
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def getdomain(self):
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"""Get the complete domain name from an address."""
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sdlist = []
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while self.pos < len(self.field):
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if self.field[self.pos] in self.LWS:
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self.pos += 1
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elif self.field[self.pos] == '(':
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self.commentlist.append(self.getcomment())
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elif self.field[self.pos] == '[':
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sdlist.append(self.getdomainliteral())
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elif self.field[self.pos] == '.':
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self.pos += 1
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sdlist.append('.')
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elif self.field[self.pos] in self.atomends:
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break
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else:
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sdlist.append(self.getatom())
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return EMPTYSTRING.join(sdlist)
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def getdelimited(self, beginchar, endchars, allowcomments=True):
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"""Parse a header fragment delimited by special characters.
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`beginchar' is the start character for the fragment.
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If self is not looking at an instance of `beginchar' then
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getdelimited returns the empty string.
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`endchars' is a sequence of allowable end-delimiting characters.
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Parsing stops when one of these is encountered.
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If `allowcomments' is non-zero, embedded RFC 2822 comments are allowed
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within the parsed fragment.
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"""
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if self.field[self.pos] != beginchar:
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return ''
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slist = ['']
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quote = False
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self.pos += 1
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while self.pos < len(self.field):
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if quote:
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slist.append(self.field[self.pos])
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quote = False
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elif self.field[self.pos] in endchars:
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self.pos += 1
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break
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elif allowcomments and self.field[self.pos] == '(':
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slist.append(self.getcomment())
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continue # have already advanced pos from getcomment
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elif self.field[self.pos] == '\\':
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quote = True
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else:
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slist.append(self.field[self.pos])
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self.pos += 1
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return EMPTYSTRING.join(slist)
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def getquote(self):
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"""Get a quote-delimited fragment from self's field."""
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return self.getdelimited('"', '"\r', False)
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def getcomment(self):
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"""Get a parenthesis-delimited fragment from self's field."""
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return self.getdelimited('(', ')\r', True)
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def getdomainliteral(self):
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"""Parse an RFC 2822 domain-literal."""
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return '[%s]' % self.getdelimited('[', ']\r', False)
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def getatom(self, atomends=None):
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"""Parse an RFC 2822 atom.
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Optional atomends specifies a different set of end token delimiters
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(the default is to use self.atomends). This is used e.g. in
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getphraselist() since phrase endings must not include the `.' (which
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is legal in phrases)."""
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atomlist = ['']
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if atomends is None:
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atomends = self.atomends
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while self.pos < len(self.field):
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if self.field[self.pos] in atomends:
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break
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else:
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atomlist.append(self.field[self.pos])
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self.pos += 1
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return EMPTYSTRING.join(atomlist)
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def getphraselist(self):
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"""Parse a sequence of RFC 2822 phrases.
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A phrase is a sequence of words, which are in turn either RFC 2822
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atoms or quoted-strings. Phrases are canonicalized by squeezing all
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runs of continuous whitespace into one space.
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"""
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plist = []
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while self.pos < len(self.field):
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if self.field[self.pos] in self.FWS:
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self.pos += 1
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elif self.field[self.pos] == '"':
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plist.append(self.getquote())
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elif self.field[self.pos] == '(':
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self.commentlist.append(self.getcomment())
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elif self.field[self.pos] in self.phraseends:
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break
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else:
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plist.append(self.getatom(self.phraseends))
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return plist
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class AddressList(AddrlistClass):
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"""An AddressList encapsulates a list of parsed RFC 2822 addresses."""
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def __init__(self, field):
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AddrlistClass.__init__(self, field)
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if field:
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self.addresslist = self.getaddrlist()
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else:
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self.addresslist = []
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def __len__(self):
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return len(self.addresslist)
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def __add__(self, other):
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# Set union
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newaddr = AddressList(None)
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newaddr.addresslist = self.addresslist[:]
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for x in other.addresslist:
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if not x in self.addresslist:
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newaddr.addresslist.append(x)
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return newaddr
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def __iadd__(self, other):
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# Set union, in-place
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for x in other.addresslist:
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if not x in self.addresslist:
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self.addresslist.append(x)
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return self
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def __sub__(self, other):
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# Set difference
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newaddr = AddressList(None)
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for x in self.addresslist:
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if not x in other.addresslist:
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newaddr.addresslist.append(x)
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return newaddr
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def __isub__(self, other):
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# Set difference, in-place
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for x in other.addresslist:
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if x in self.addresslist:
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self.addresslist.remove(x)
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return self
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def __getitem__(self, index):
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# Make indexing, slices, and 'in' work
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return self.addresslist[index]
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