63563cdf9d
Such addresses are not RFC compliant except under the 'obsolete syntax' rules, but before this fix the whitespace was dropped from the input, concatenating the pieces. That breaks one of the principles of the email package, that of preserving the input as much as possible. It also denies the application program the opportunity to apply its own heuristics to interpretation of such non-compliant addresses. It is possible users of the email package were depending on the local part always being a single token, so this fix will not be backported.
510 lines
16 KiB
Python
510 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 > 0:
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data[3:] = [s[:i], s[i+1:]]
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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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