micropython-lib/unix-ffi/email.internal/email/_parseaddr.py

576 wiersze
17 KiB
Python

# Copyright (C) 2002-2007 Python Software Foundation
# Contact: email-sig@python.org
"""Email address parsing code.
Lifted directly from rfc822.py. This should eventually be rewritten.
"""
__all__ = [
"mktime_tz",
"parsedate",
"parsedate_tz",
"quote",
]
import time, calendar
SPACE = " "
EMPTYSTRING = ""
COMMASPACE = ", "
# Parse a date field
_monthnames = [
"jan",
"feb",
"mar",
"apr",
"may",
"jun",
"jul",
"aug",
"sep",
"oct",
"nov",
"dec",
"january",
"february",
"march",
"april",
"may",
"june",
"july",
"august",
"september",
"october",
"november",
"december",
]
_daynames = ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]
# The timezone table does not include the military time zones defined
# in RFC822, other than Z. According to RFC1123, the description in
# RFC822 gets the signs wrong, so we can't rely on any such time
# zones. RFC1123 recommends that numeric timezone indicators be used
# instead of timezone names.
_timezones = {
"UT": 0,
"UTC": 0,
"GMT": 0,
"Z": 0,
"AST": -400,
"ADT": -300, # Atlantic (used in Canada)
"EST": -500,
"EDT": -400, # Eastern
"CST": -600,
"CDT": -500, # Central
"MST": -700,
"MDT": -600, # Mountain
"PST": -800,
"PDT": -700, # Pacific
}
def parsedate_tz(data):
"""Convert a date string to a time tuple.
Accounts for military timezones.
"""
res = _parsedate_tz(data)
if not res:
return
if res[9] is None:
res[9] = 0
return tuple(res)
def _parsedate_tz(data):
"""Convert date to extended time tuple.
The last (additional) element is the time zone offset in seconds, except if
the timezone was specified as -0000. In that case the last element is
None. This indicates a UTC timestamp that explicitly declaims knowledge of
the source timezone, as opposed to a +0000 timestamp that indicates the
source timezone really was UTC.
"""
if not data:
return
data = data.split()
# The FWS after the comma after the day-of-week is optional, so search and
# adjust for this.
if data[0].endswith(",") or data[0].lower() in _daynames:
# There's a dayname here. Skip it
del data[0]
else:
i = data[0].rfind(",")
if i >= 0:
data[0] = data[0][i + 1 :]
if len(data) == 3: # RFC 850 date, deprecated
stuff = data[0].split("-")
if len(stuff) == 3:
data = stuff + data[1:]
if len(data) == 4:
s = data[3]
i = s.find("+")
if i == -1:
i = s.find("-")
if i > 0:
data[3:] = [s[:i], s[i:]]
else:
data.append("") # Dummy tz
if len(data) < 5:
return None
data = data[:5]
[dd, mm, yy, tm, tz] = data
mm = mm.lower()
if mm not in _monthnames:
dd, mm = mm, dd.lower()
if mm not in _monthnames:
return None
mm = _monthnames.index(mm) + 1
if mm > 12:
mm -= 12
if dd[-1] == ",":
dd = dd[:-1]
i = yy.find(":")
if i > 0:
yy, tm = tm, yy
if yy[-1] == ",":
yy = yy[:-1]
if not yy[0].isdigit():
yy, tz = tz, yy
if tm[-1] == ",":
tm = tm[:-1]
tm = tm.split(":")
if len(tm) == 2:
[thh, tmm] = tm
tss = "0"
elif len(tm) == 3:
[thh, tmm, tss] = tm
elif len(tm) == 1 and "." in tm[0]:
# Some non-compliant MUAs use '.' to separate time elements.
tm = tm[0].split(".")
if len(tm) == 2:
[thh, tmm] = tm
tss = 0
elif len(tm) == 3:
[thh, tmm, tss] = tm
else:
return None
try:
yy = int(yy)
dd = int(dd)
thh = int(thh)
tmm = int(tmm)
tss = int(tss)
except ValueError:
return None
# Check for a yy specified in two-digit format, then convert it to the
# appropriate four-digit format, according to the POSIX standard. RFC 822
# calls for a two-digit yy, but RFC 2822 (which obsoletes RFC 822)
# mandates a 4-digit yy. For more information, see the documentation for
# the time module.
if yy < 100:
# The year is between 1969 and 1999 (inclusive).
if yy > 68:
yy += 1900
# The year is between 2000 and 2068 (inclusive).
else:
yy += 2000
tzoffset = None
tz = tz.upper()
if tz in _timezones:
tzoffset = _timezones[tz]
else:
try:
tzoffset = int(tz)
except ValueError:
pass
if tzoffset == 0 and tz.startswith("-"):
tzoffset = None
# Convert a timezone offset into seconds ; -0500 -> -18000
if tzoffset:
if tzoffset < 0:
tzsign = -1
tzoffset = -tzoffset
else:
tzsign = 1
tzoffset = tzsign * ((tzoffset // 100) * 3600 + (tzoffset % 100) * 60)
# Daylight Saving Time flag is set to -1, since DST is unknown.
return [yy, mm, dd, thh, tmm, tss, 0, 1, -1, tzoffset]
def parsedate(data):
"""Convert a time string to a time tuple."""
t = parsedate_tz(data)
if isinstance(t, tuple):
return t[:9]
else:
return t
def mktime_tz(data):
"""Turn a 10-tuple as returned by parsedate_tz() into a POSIX timestamp."""
if data[9] is None:
# No zone info, so localtime is better assumption than GMT
return time.mktime(data[:8] + (-1,))
else:
t = calendar.timegm(data)
return t - data[9]
def quote(str):
"""Prepare string to be used in a quoted string.
Turns backslash and double quote characters into quoted pairs. These
are the only characters that need to be quoted inside a quoted string.
Does not add the surrounding double quotes.
"""
return str.replace("\\", "\\\\").replace('"', '\\"')
class AddrlistClass:
"""Address parser class by Ben Escoto.
To understand what this class does, it helps to have a copy of RFC 2822 in
front of you.
Note: this class interface is deprecated and may be removed in the future.
Use email.utils.AddressList instead.
"""
def __init__(self, field):
"""Initialize a new instance.
`field' is an unparsed address header field, containing
one or more addresses.
"""
self.specials = '()<>@,:;."[]'
self.pos = 0
self.LWS = " \t"
self.CR = "\r\n"
self.FWS = self.LWS + self.CR
self.atomends = self.specials + self.LWS + self.CR
# Note that RFC 2822 now specifies `.' as obs-phrase, meaning that it
# is obsolete syntax. RFC 2822 requires that we recognize obsolete
# syntax, so allow dots in phrases.
self.phraseends = self.atomends.replace(".", "")
self.field = field
self.commentlist = []
def gotonext(self):
"""Skip white space and extract comments."""
wslist = []
while self.pos < len(self.field):
if self.field[self.pos] in self.LWS + "\n\r":
if self.field[self.pos] not in "\n\r":
wslist.append(self.field[self.pos])
self.pos += 1
elif self.field[self.pos] == "(":
self.commentlist.append(self.getcomment())
else:
break
return EMPTYSTRING.join(wslist)
def getaddrlist(self):
"""Parse all addresses.
Returns a list containing all of the addresses.
"""
result = []
while self.pos < len(self.field):
ad = self.getaddress()
if ad:
result += ad
else:
result.append(("", ""))
return result
def getaddress(self):
"""Parse the next address."""
self.commentlist = []
self.gotonext()
oldpos = self.pos
oldcl = self.commentlist
plist = self.getphraselist()
self.gotonext()
returnlist = []
if self.pos >= len(self.field):
# Bad email address technically, no domain.
if plist:
returnlist = [(SPACE.join(self.commentlist), plist[0])]
elif self.field[self.pos] in ".@":
# email address is just an addrspec
# this isn't very efficient since we start over
self.pos = oldpos
self.commentlist = oldcl
addrspec = self.getaddrspec()
returnlist = [(SPACE.join(self.commentlist), addrspec)]
elif self.field[self.pos] == ":":
# address is a group
returnlist = []
fieldlen = len(self.field)
self.pos += 1
while self.pos < len(self.field):
self.gotonext()
if self.pos < fieldlen and self.field[self.pos] == ";":
self.pos += 1
break
returnlist = returnlist + self.getaddress()
elif self.field[self.pos] == "<":
# Address is a phrase then a route addr
routeaddr = self.getrouteaddr()
if self.commentlist:
returnlist = [
(SPACE.join(plist) + " (" + " ".join(self.commentlist) + ")", routeaddr)
]
else:
returnlist = [(SPACE.join(plist), routeaddr)]
else:
if plist:
returnlist = [(SPACE.join(self.commentlist), plist[0])]
elif self.field[self.pos] in self.specials:
self.pos += 1
self.gotonext()
if self.pos < len(self.field) and self.field[self.pos] == ",":
self.pos += 1
return returnlist
def getrouteaddr(self):
"""Parse a route address (Return-path value).
This method just skips all the route stuff and returns the addrspec.
"""
if self.field[self.pos] != "<":
return
expectroute = False
self.pos += 1
self.gotonext()
adlist = ""
while self.pos < len(self.field):
if expectroute:
self.getdomain()
expectroute = False
elif self.field[self.pos] == ">":
self.pos += 1
break
elif self.field[self.pos] == "@":
self.pos += 1
expectroute = True
elif self.field[self.pos] == ":":
self.pos += 1
else:
adlist = self.getaddrspec()
self.pos += 1
break
self.gotonext()
return adlist
def getaddrspec(self):
"""Parse an RFC 2822 addr-spec."""
aslist = []
self.gotonext()
while self.pos < len(self.field):
preserve_ws = True
if self.field[self.pos] == ".":
if aslist and not aslist[-1].strip():
aslist.pop()
aslist.append(".")
self.pos += 1
preserve_ws = False
elif self.field[self.pos] == '"':
aslist.append('"%s"' % quote(self.getquote()))
elif self.field[self.pos] in self.atomends:
if aslist and not aslist[-1].strip():
aslist.pop()
break
else:
aslist.append(self.getatom())
ws = self.gotonext()
if preserve_ws and ws:
aslist.append(ws)
if self.pos >= len(self.field) or self.field[self.pos] != "@":
return EMPTYSTRING.join(aslist)
aslist.append("@")
self.pos += 1
self.gotonext()
return EMPTYSTRING.join(aslist) + self.getdomain()
def getdomain(self):
"""Get the complete domain name from an address."""
sdlist = []
while self.pos < len(self.field):
if self.field[self.pos] in self.LWS:
self.pos += 1
elif self.field[self.pos] == "(":
self.commentlist.append(self.getcomment())
elif self.field[self.pos] == "[":
sdlist.append(self.getdomainliteral())
elif self.field[self.pos] == ".":
self.pos += 1
sdlist.append(".")
elif self.field[self.pos] in self.atomends:
break
else:
sdlist.append(self.getatom())
return EMPTYSTRING.join(sdlist)
def getdelimited(self, beginchar, endchars, allowcomments=True):
"""Parse a header fragment delimited by special characters.
`beginchar' is the start character for the fragment.
If self is not looking at an instance of `beginchar' then
getdelimited returns the empty string.
`endchars' is a sequence of allowable end-delimiting characters.
Parsing stops when one of these is encountered.
If `allowcomments' is non-zero, embedded RFC 2822 comments are allowed
within the parsed fragment.
"""
if self.field[self.pos] != beginchar:
return ""
slist = [""]
quote = False
self.pos += 1
while self.pos < len(self.field):
if quote:
slist.append(self.field[self.pos])
quote = False
elif self.field[self.pos] in endchars:
self.pos += 1
break
elif allowcomments and self.field[self.pos] == "(":
slist.append(self.getcomment())
continue # have already advanced pos from getcomment
elif self.field[self.pos] == "\\":
quote = True
else:
slist.append(self.field[self.pos])
self.pos += 1
return EMPTYSTRING.join(slist)
def getquote(self):
"""Get a quote-delimited fragment from self's field."""
return self.getdelimited('"', '"\r', False)
def getcomment(self):
"""Get a parenthesis-delimited fragment from self's field."""
return self.getdelimited("(", ")\r", True)
def getdomainliteral(self):
"""Parse an RFC 2822 domain-literal."""
return "[%s]" % self.getdelimited("[", "]\r", False)
def getatom(self, atomends=None):
"""Parse an RFC 2822 atom.
Optional atomends specifies a different set of end token delimiters
(the default is to use self.atomends). This is used e.g. in
getphraselist() since phrase endings must not include the `.' (which
is legal in phrases)."""
atomlist = [""]
if atomends is None:
atomends = self.atomends
while self.pos < len(self.field):
if self.field[self.pos] in atomends:
break
else:
atomlist.append(self.field[self.pos])
self.pos += 1
return EMPTYSTRING.join(atomlist)
def getphraselist(self):
"""Parse a sequence of RFC 2822 phrases.
A phrase is a sequence of words, which are in turn either RFC 2822
atoms or quoted-strings. Phrases are canonicalized by squeezing all
runs of continuous whitespace into one space.
"""
plist = []
while self.pos < len(self.field):
if self.field[self.pos] in self.FWS:
self.pos += 1
elif self.field[self.pos] == '"':
plist.append(self.getquote())
elif self.field[self.pos] == "(":
self.commentlist.append(self.getcomment())
elif self.field[self.pos] in self.phraseends:
break
else:
plist.append(self.getatom(self.phraseends))
return plist
class AddressList(AddrlistClass):
"""An AddressList encapsulates a list of parsed RFC 2822 addresses."""
def __init__(self, field):
AddrlistClass.__init__(self, field)
if field:
self.addresslist = self.getaddrlist()
else:
self.addresslist = []
def __len__(self):
return len(self.addresslist)
def __add__(self, other):
# Set union
newaddr = AddressList(None)
newaddr.addresslist = self.addresslist[:]
for x in other.addresslist:
if not x in self.addresslist:
newaddr.addresslist.append(x)
return newaddr
def __iadd__(self, other):
# Set union, in-place
for x in other.addresslist:
if not x in self.addresslist:
self.addresslist.append(x)
return self
def __sub__(self, other):
# Set difference
newaddr = AddressList(None)
for x in self.addresslist:
if not x in other.addresslist:
newaddr.addresslist.append(x)
return newaddr
def __isub__(self, other):
# Set difference, in-place
for x in other.addresslist:
if x in self.addresslist:
self.addresslist.remove(x)
return self
def __getitem__(self, index):
# Make indexing, slices, and 'in' work
return self.addresslist[index]