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cpython/Lib/email/_header_value_parser.py
R David Murray 7d0325d6c8 #23745: handle duplicate MIME parameter names in new parser. 
This mimics get_param's error handling for the most part.  It is slightly
better in some regards as get_param can produce some really weird results for
duplicate *0* parts.  It departs from get_param slightly in that if we have a
mix of non-extended and extended pieces for the same parameter name, the new
parser assumes they were all supposed to be extended and concatenates all the
values, whereas get_param always picks the non-extended parameter value.  All
of this error recovery is pretty much arbitrary decisions...
2015-03-29 21:53:05 -04:00

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"""Header value parser implementing various email-related RFC parsing rules.
The parsing methods defined in this module implement various email related
parsing rules. Principal among them is RFC 5322, which is the followon
to RFC 2822 and primarily a clarification of the former. It also implements
RFC 2047 encoded word decoding.
RFC 5322 goes to considerable trouble to maintain backward compatibility with
RFC 822 in the parse phase, while cleaning up the structure on the generation
phase. This parser supports correct RFC 5322 generation by tagging white space
as folding white space only when folding is allowed in the non-obsolete rule
sets. Actually, the parser is even more generous when accepting input than RFC
5322 mandates, following the spirit of Postel's Law, which RFC 5322 encourages.
Where possible deviations from the standard are annotated on the 'defects'
attribute of tokens that deviate.
The general structure of the parser follows RFC 5322, and uses its terminology
where there is a direct correspondence. Where the implementation requires a
somewhat different structure than that used by the formal grammar, new terms
that mimic the closest existing terms are used. Thus, it really helps to have
a copy of RFC 5322 handy when studying this code.
Input to the parser is a string that has already been unfolded according to
RFC 5322 rules. According to the RFC this unfolding is the very first step, and
this parser leaves the unfolding step to a higher level message parser, which
will have already detected the line breaks that need unfolding while
determining the beginning and end of each header.
The output of the parser is a TokenList object, which is a list subclass. A
TokenList is a recursive data structure. The terminal nodes of the structure
are Terminal objects, which are subclasses of str. These do not correspond
directly to terminal objects in the formal grammar, but are instead more
practical higher level combinations of true terminals.
All TokenList and Terminal objects have a 'value' attribute, which produces the
semantically meaningful value of that part of the parse subtree. The value of
all whitespace tokens (no matter how many sub-tokens they may contain) is a
single space, as per the RFC rules. This includes 'CFWS', which is herein
included in the general class of whitespace tokens. There is one exception to
the rule that whitespace tokens are collapsed into single spaces in values: in
the value of a 'bare-quoted-string' (a quoted-string with no leading or
trailing whitespace), any whitespace that appeared between the quotation marks
is preserved in the returned value. Note that in all Terminal strings quoted
pairs are turned into their unquoted values.
All TokenList and Terminal objects also have a string value, which attempts to
be a "canonical" representation of the RFC-compliant form of the substring that
produced the parsed subtree, including minimal use of quoted pair quoting.
Whitespace runs are not collapsed.
Comment tokens also have a 'content' attribute providing the string found
between the parens (including any nested comments) with whitespace preserved.
All TokenList and Terminal objects have a 'defects' attribute which is a
possibly empty list all of the defects found while creating the token. Defects
may appear on any token in the tree, and a composite list of all defects in the
subtree is available through the 'all_defects' attribute of any node. (For
Terminal notes x.defects == x.all_defects.)
Each object in a parse tree is called a 'token', and each has a 'token_type'
attribute that gives the name from the RFC 5322 grammar that it represents.
Not all RFC 5322 nodes are produced, and there is one non-RFC 5322 node that
may be produced: 'ptext'. A 'ptext' is a string of printable ascii characters.
It is returned in place of lists of (ctext/quoted-pair) and
(qtext/quoted-pair).
XXX: provide complete list of token types.
"""
import re
import urllib # For urllib.parse.unquote
from string import hexdigits
from collections import OrderedDict
from operator import itemgetter
from email import _encoded_words as _ew
from email import errors
from email import utils
#
# Useful constants and functions
#
WSP = set(' \t')
CFWS_LEADER = WSP | set('(')
SPECIALS = set(r'()<>@,:;.\"[]')
ATOM_ENDS = SPECIALS | WSP
DOT_ATOM_ENDS = ATOM_ENDS - set('.')
# '.', '"', and '(' do not end phrases in order to support obs-phrase
PHRASE_ENDS = SPECIALS - set('."(')
TSPECIALS = (SPECIALS | set('/?=')) - set('.')
TOKEN_ENDS = TSPECIALS | WSP
ASPECIALS = TSPECIALS | set("*'%")
ATTRIBUTE_ENDS = ASPECIALS | WSP
EXTENDED_ATTRIBUTE_ENDS = ATTRIBUTE_ENDS - set('%')
def quote_string(value):
return '"'+str(value).replace('\\', '\\\\').replace('"', r'\"')+'"'
#
# Accumulator for header folding
#
class _Folded:
def __init__(self, maxlen, policy):
self.maxlen = maxlen
self.policy = policy
self.lastlen = 0
self.stickyspace = None
self.firstline = True
self.done = []
self.current = []
def newline(self):
self.done.extend(self.current)
self.done.append(self.policy.linesep)
self.current.clear()
self.lastlen = 0
def finalize(self):
if self.current:
self.newline()
def __str__(self):
return ''.join(self.done)
def append(self, stoken):
self.current.append(stoken)
def append_if_fits(self, token, stoken=None):
if stoken is None:
stoken = str(token)
l = len(stoken)
if self.stickyspace is not None:
stickyspace_len = len(self.stickyspace)
if self.lastlen + stickyspace_len + l <= self.maxlen:
self.current.append(self.stickyspace)
self.lastlen += stickyspace_len
self.current.append(stoken)
self.lastlen += l
self.stickyspace = None
self.firstline = False
return True
if token.has_fws:
ws = token.pop_leading_fws()
if ws is not None:
self.stickyspace += str(ws)
stickyspace_len += len(ws)
token._fold(self)
return True
if stickyspace_len and l + 1 <= self.maxlen:
margin = self.maxlen - l
if 0 < margin < stickyspace_len:
trim = stickyspace_len - margin
self.current.append(self.stickyspace[:trim])
self.stickyspace = self.stickyspace[trim:]
stickyspace_len = trim
self.newline()
self.current.append(self.stickyspace)
self.current.append(stoken)
self.lastlen = l + stickyspace_len
self.stickyspace = None
self.firstline = False
return True
if not self.firstline:
self.newline()
self.current.append(self.stickyspace)
self.current.append(stoken)
self.stickyspace = None
self.firstline = False
return True
if self.lastlen + l <= self.maxlen:
self.current.append(stoken)
self.lastlen += l
return True
if l < self.maxlen:
self.newline()
self.current.append(stoken)
self.lastlen = l
return True
return False
#
# TokenList and its subclasses
#
class TokenList(list):
token_type = None
def __init__(self, *args, **kw):
super().__init__(*args, **kw)
self.defects = []
def __str__(self):
return ''.join(str(x) for x in self)
def __repr__(self):
return '{}({})'.format(self.__class__.__name__,
super().__repr__())
@property
def value(self):
return ''.join(x.value for x in self if x.value)
@property
def all_defects(self):
return sum((x.all_defects for x in self), self.defects)
#
# Folding API
#
# parts():
#
# return a list of objects that constitute the "higher level syntactic
# objects" specified by the RFC as the best places to fold a header line.
# The returned objects must include leading folding white space, even if
# this means mutating the underlying parse tree of the object. Each object
# is only responsible for returning *its* parts, and should not drill down
# to any lower level except as required to meet the leading folding white
# space constraint.
#
# _fold(folded):
#
# folded: the result accumulator. This is an instance of _Folded.
# (XXX: I haven't finished factoring this out yet, the folding code
# pretty much uses this as a state object.) When the folded.current
# contains as much text as will fit, the _fold method should call
# folded.newline.
# folded.lastlen: the current length of the test stored in folded.current.
# folded.maxlen: The maximum number of characters that may appear on a
# folded line. Differs from the policy setting in that "no limit" is
# represented by +inf, which means it can be used in the trivially
# logical fashion in comparisons.
#
# Currently no subclasses implement parts, and I think this will remain
# true. A subclass only needs to implement _fold when the generic version
# isn't sufficient. _fold will need to be implemented primarily when it is
# possible for encoded words to appear in the specialized token-list, since
# there is no generic algorithm that can know where exactly the encoded
# words are allowed. A _fold implementation is responsible for filling
# lines in the same general way that the top level _fold does. It may, and
# should, call the _fold method of sub-objects in a similar fashion to that
# of the top level _fold.
#
# XXX: I'm hoping it will be possible to factor the existing code further
# to reduce redundancy and make the logic clearer.
@property
def parts(self):
klass = self.__class__
this = []
for token in self:
if token.startswith_fws():
if this:
yield this[0] if len(this)==1 else klass(this)
this.clear()
end_ws = token.pop_trailing_ws()
this.append(token)
if end_ws:
yield klass(this)
this = [end_ws]
if this:
yield this[0] if len(this)==1 else klass(this)
def startswith_fws(self):
return self[0].startswith_fws()
def pop_leading_fws(self):
if self[0].token_type == 'fws':
return self.pop(0)
return self[0].pop_leading_fws()
def pop_trailing_ws(self):
if self[-1].token_type == 'cfws':
return self.pop(-1)
return self[-1].pop_trailing_ws()
@property
def has_fws(self):
for part in self:
if part.has_fws:
return True
return False
def has_leading_comment(self):
return self[0].has_leading_comment()
@property
def comments(self):
comments = []
for token in self:
comments.extend(token.comments)
return comments
def fold(self, *, policy):
# max_line_length 0/None means no limit, ie: infinitely long.
maxlen = policy.max_line_length or float("+inf")
folded = _Folded(maxlen, policy)
self._fold(folded)
folded.finalize()
return str(folded)
def as_encoded_word(self, charset):
# This works only for things returned by 'parts', which include
# the leading fws, if any, that should be used.
res = []
ws = self.pop_leading_fws()
if ws:
res.append(ws)
trailer = self.pop(-1) if self[-1].token_type=='fws' else ''
res.append(_ew.encode(str(self), charset))
res.append(trailer)
return ''.join(res)
def cte_encode(self, charset, policy):
res = []
for part in self:
res.append(part.cte_encode(charset, policy))
return ''.join(res)
def _fold(self, folded):
for part in self.parts:
tstr = str(part)
tlen = len(tstr)
try:
str(part).encode('us-ascii')
except UnicodeEncodeError:
if any(isinstance(x, errors.UndecodableBytesDefect)
for x in part.all_defects):
charset = 'unknown-8bit'
else:
# XXX: this should be a policy setting
charset = 'utf-8'
tstr = part.cte_encode(charset, folded.policy)
tlen = len(tstr)
if folded.append_if_fits(part, tstr):
continue
# Peel off the leading whitespace if any and make it sticky, to
# avoid infinite recursion.
ws = part.pop_leading_fws()
if ws is not None:
# Peel off the leading whitespace and make it sticky, to
# avoid infinite recursion.
folded.stickyspace = str(part.pop(0))
if folded.append_if_fits(part):
continue
if part.has_fws:
part._fold(folded)
continue
# There are no fold points in this one; it is too long for a single
# line and can't be split...we just have to put it on its own line.
folded.append(tstr)
folded.newline()
def pprint(self, indent=''):
print('\n'.join(self._pp(indent='')))
def ppstr(self, indent=''):
return '\n'.join(self._pp(indent=''))
def _pp(self, indent=''):
yield '{}{}/{}('.format(
indent,
self.__class__.__name__,
self.token_type)
for token in self:
if not hasattr(token, '_pp'):
yield (indent + ' !! invalid element in token '
'list: {!r}'.format(token))
else:
yield from token._pp(indent+' ')
if self.defects:
extra = ' Defects: {}'.format(self.defects)
else:
extra = ''
yield '{}){}'.format(indent, extra)
class WhiteSpaceTokenList(TokenList):
@property
def value(self):
return ' '
@property
def comments(self):
return [x.content for x in self if x.token_type=='comment']
class UnstructuredTokenList(TokenList):
token_type = 'unstructured'
def _fold(self, folded):
last_ew = None
for part in self.parts:
tstr = str(part)
is_ew = False
try:
str(part).encode('us-ascii')
except UnicodeEncodeError:
if any(isinstance(x, errors.UndecodableBytesDefect)
for x in part.all_defects):
charset = 'unknown-8bit'
else:
charset = 'utf-8'
if last_ew is not None:
# We've already done an EW, combine this one with it
# if there's room.
chunk = get_unstructured(
''.join(folded.current[last_ew:]+[tstr])).as_encoded_word(charset)
oldlastlen = sum(len(x) for x in folded.current[:last_ew])
schunk = str(chunk)
lchunk = len(schunk)
if oldlastlen + lchunk <= folded.maxlen:
del folded.current[last_ew:]
folded.append(schunk)
folded.lastlen = oldlastlen + lchunk
continue
tstr = part.as_encoded_word(charset)
is_ew = True
if folded.append_if_fits(part, tstr):
if is_ew:
last_ew = len(folded.current) - 1
continue
if is_ew or last_ew:
# It's too big to fit on the line, but since we've
# got encoded words we can use encoded word folding.
part._fold_as_ew(folded)
continue
# Peel off the leading whitespace if any and make it sticky, to
# avoid infinite recursion.
ws = part.pop_leading_fws()
if ws is not None:
folded.stickyspace = str(ws)
if folded.append_if_fits(part):
continue
if part.has_fws:
part.fold(folded)
continue
# It can't be split...we just have to put it on its own line.
folded.append(tstr)
folded.newline()
last_ew = None
def cte_encode(self, charset, policy):
res = []
last_ew = None
for part in self:
spart = str(part)
try:
spart.encode('us-ascii')
res.append(spart)
except UnicodeEncodeError:
if last_ew is None:
res.append(part.cte_encode(charset, policy))
last_ew = len(res)
else:
tl = get_unstructured(''.join(res[last_ew:] + [spart]))
res.append(tl.as_encoded_word())
return ''.join(res)
class Phrase(TokenList):
token_type = 'phrase'
def _fold(self, folded):
# As with Unstructured, we can have pure ASCII with or without
# surrogateescape encoded bytes, or we could have unicode. But this
# case is more complicated, since we have to deal with the various
# sub-token types and how they can be composed in the face of
# unicode-that-needs-CTE-encoding, and the fact that if a token a
# comment that becomes a barrier across which we can't compose encoded
# words.
last_ew = None
for part in self.parts:
tstr = str(part)
tlen = len(tstr)
has_ew = False
try:
str(part).encode('us-ascii')
except UnicodeEncodeError:
if any(isinstance(x, errors.UndecodableBytesDefect)
for x in part.all_defects):
charset = 'unknown-8bit'
else:
charset = 'utf-8'
if last_ew is not None and not part.has_leading_comment():
# We've already done an EW, let's see if we can combine
# this one with it. The last_ew logic ensures that all we
# have at this point is atoms, no comments or quoted
# strings. So we can treat the text between the last
# encoded word and the content of this token as
# unstructured text, and things will work correctly. But
# we have to strip off any trailing comment on this token
# first, and if it is a quoted string we have to pull out
# the content (we're encoding it, so it no longer needs to
# be quoted).
if part[-1].token_type == 'cfws' and part.comments:
remainder = part.pop(-1)
else:
remainder = ''
for i, token in enumerate(part):
if token.token_type == 'bare-quoted-string':
part[i] = UnstructuredTokenList(token[:])
chunk = get_unstructured(
''.join(folded.current[last_ew:]+[tstr])).as_encoded_word(charset)
schunk = str(chunk)
lchunk = len(schunk)
if last_ew + lchunk <= folded.maxlen:
del folded.current[last_ew:]
folded.append(schunk)
folded.lastlen = sum(len(x) for x in folded.current)
continue
tstr = part.as_encoded_word(charset)
tlen = len(tstr)
has_ew = True
if folded.append_if_fits(part, tstr):
if has_ew and not part.comments:
last_ew = len(folded.current) - 1
elif part.comments or part.token_type == 'quoted-string':
# If a comment is involved we can't combine EWs. And if a
# quoted string is involved, it's not worth the effort to
# try to combine them.
last_ew = None
continue
part._fold(folded)
def cte_encode(self, charset, policy):
res = []
last_ew = None
is_ew = False
for part in self:
spart = str(part)
try:
spart.encode('us-ascii')
res.append(spart)
except UnicodeEncodeError:
is_ew = True
if last_ew is None:
if not part.comments:
last_ew = len(res)
res.append(part.cte_encode(charset, policy))
elif not part.has_leading_comment():
if part[-1].token_type == 'cfws' and part.comments:
remainder = part.pop(-1)
else:
remainder = ''
for i, token in enumerate(part):
if token.token_type == 'bare-quoted-string':
part[i] = UnstructuredTokenList(token[:])
tl = get_unstructured(''.join(res[last_ew:] + [spart]))
res[last_ew:] = [tl.as_encoded_word(charset)]
if part.comments or (not is_ew and part.token_type == 'quoted-string'):
last_ew = None
return ''.join(res)
class Word(TokenList):
token_type = 'word'
class CFWSList(WhiteSpaceTokenList):
token_type = 'cfws'
def has_leading_comment(self):
return bool(self.comments)
class Atom(TokenList):
token_type = 'atom'
class Token(TokenList):
token_type = 'token'
class EncodedWord(TokenList):
token_type = 'encoded-word'
cte = None
charset = None
lang = None
@property
def encoded(self):
if self.cte is not None:
return self.cte
_ew.encode(str(self), self.charset)
class QuotedString(TokenList):
token_type = 'quoted-string'
@property
def content(self):
for x in self:
if x.token_type == 'bare-quoted-string':
return x.value
@property
def quoted_value(self):
res = []
for x in self:
if x.token_type == 'bare-quoted-string':
res.append(str(x))
else:
res.append(x.value)
return ''.join(res)
@property
def stripped_value(self):
for token in self:
if token.token_type == 'bare-quoted-string':
return token.value
class BareQuotedString(QuotedString):
token_type = 'bare-quoted-string'
def __str__(self):
return quote_string(''.join(str(x) for x in self))
@property
def value(self):
return ''.join(str(x) for x in self)
class Comment(WhiteSpaceTokenList):
token_type = 'comment'
def __str__(self):
return ''.join(sum([
["("],
[self.quote(x) for x in self],
[")"],
], []))
def quote(self, value):
if value.token_type == 'comment':
return str(value)
return str(value).replace('\\', '\\\\').replace(
'(', '\(').replace(
')', '\)')
@property
def content(self):
return ''.join(str(x) for x in self)
@property
def comments(self):
return [self.content]
class AddressList(TokenList):
token_type = 'address-list'
@property
def addresses(self):
return [x for x in self if x.token_type=='address']
@property
def mailboxes(self):
return sum((x.mailboxes
for x in self if x.token_type=='address'), [])
@property
def all_mailboxes(self):
return sum((x.all_mailboxes
for x in self if x.token_type=='address'), [])
class Address(TokenList):
token_type = 'address'
@property
def display_name(self):
if self[0].token_type == 'group':
return self[0].display_name
@property
def mailboxes(self):
if self[0].token_type == 'mailbox':
return [self[0]]
elif self[0].token_type == 'invalid-mailbox':
return []
return self[0].mailboxes
@property
def all_mailboxes(self):
if self[0].token_type == 'mailbox':
return [self[0]]
elif self[0].token_type == 'invalid-mailbox':
return [self[0]]
return self[0].all_mailboxes
class MailboxList(TokenList):
token_type = 'mailbox-list'
@property
def mailboxes(self):
return [x for x in self if x.token_type=='mailbox']
@property
def all_mailboxes(self):
return [x for x in self
if x.token_type in ('mailbox', 'invalid-mailbox')]
class GroupList(TokenList):
token_type = 'group-list'
@property
def mailboxes(self):
if not self or self[0].token_type != 'mailbox-list':
return []
return self[0].mailboxes
@property
def all_mailboxes(self):
if not self or self[0].token_type != 'mailbox-list':
return []
return self[0].all_mailboxes
class Group(TokenList):
token_type = "group"
@property
def mailboxes(self):
if self[2].token_type != 'group-list':
return []
return self[2].mailboxes
@property
def all_mailboxes(self):
if self[2].token_type != 'group-list':
return []
return self[2].all_mailboxes
@property
def display_name(self):
return self[0].display_name
class NameAddr(TokenList):
token_type = 'name-addr'
@property
def display_name(self):
if len(self) == 1:
return None
return self[0].display_name
@property
def local_part(self):
return self[-1].local_part
@property
def domain(self):
return self[-1].domain
@property
def route(self):
return self[-1].route
@property
def addr_spec(self):
return self[-1].addr_spec
class AngleAddr(TokenList):
token_type = 'angle-addr'
@property
def local_part(self):
for x in self:
if x.token_type == 'addr-spec':
return x.local_part
@property
def domain(self):
for x in self:
if x.token_type == 'addr-spec':
return x.domain
@property
def route(self):
for x in self:
if x.token_type == 'obs-route':
return x.domains
@property
def addr_spec(self):
for x in self:
if x.token_type == 'addr-spec':
return x.addr_spec
else:
return '<>'
class ObsRoute(TokenList):
token_type = 'obs-route'
@property
def domains(self):
return [x.domain for x in self if x.token_type == 'domain']
class Mailbox(TokenList):
token_type = 'mailbox'
@property
def display_name(self):
if self[0].token_type == 'name-addr':
return self[0].display_name
@property
def local_part(self):
return self[0].local_part
@property
def domain(self):
return self[0].domain
@property
def route(self):
if self[0].token_type == 'name-addr':
return self[0].route
@property
def addr_spec(self):
return self[0].addr_spec
class InvalidMailbox(TokenList):
token_type = 'invalid-mailbox'
@property
def display_name(self):
return None
local_part = domain = route = addr_spec = display_name
class Domain(TokenList):
token_type = 'domain'
@property
def domain(self):
return ''.join(super().value.split())
class DotAtom(TokenList):
token_type = 'dot-atom'
class DotAtomText(TokenList):
token_type = 'dot-atom-text'
class AddrSpec(TokenList):
token_type = 'addr-spec'
@property
def local_part(self):
return self[0].local_part
@property
def domain(self):
if len(self) < 3:
return None
return self[-1].domain
@property
def value(self):
if len(self) < 3:
return self[0].value
return self[0].value.rstrip()+self[1].value+self[2].value.lstrip()
@property
def addr_spec(self):
nameset = set(self.local_part)
if len(nameset) > len(nameset-DOT_ATOM_ENDS):
lp = quote_string(self.local_part)
else:
lp = self.local_part
if self.domain is not None:
return lp + '@' + self.domain
return lp
class ObsLocalPart(TokenList):
token_type = 'obs-local-part'
class DisplayName(Phrase):
token_type = 'display-name'
@property
def display_name(self):
res = TokenList(self)
if res[0].token_type == 'cfws':
res.pop(0)
else:
if res[0][0].token_type == 'cfws':
res[0] = TokenList(res[0][1:])
if res[-1].token_type == 'cfws':
res.pop()
else:
if res[-1][-1].token_type == 'cfws':
res[-1] = TokenList(res[-1][:-1])
return res.value
@property
def value(self):
quote = False
if self.defects:
quote = True
else:
for x in self:
if x.token_type == 'quoted-string':
quote = True
if quote:
pre = post = ''
if self[0].token_type=='cfws' or self[0][0].token_type=='cfws':
pre = ' '
if self[-1].token_type=='cfws' or self[-1][-1].token_type=='cfws':
post = ' '
return pre+quote_string(self.display_name)+post
else:
return super().value
class LocalPart(TokenList):
token_type = 'local-part'
@property
def value(self):
if self[0].token_type == "quoted-string":
return self[0].quoted_value
else:
return self[0].value
@property
def local_part(self):
# Strip whitespace from front, back, and around dots.
res = [DOT]
last = DOT
last_is_tl = False
for tok in self[0] + [DOT]:
if tok.token_type == 'cfws':
continue
if (last_is_tl and tok.token_type == 'dot' and
last[-1].token_type == 'cfws'):
res[-1] = TokenList(last[:-1])
is_tl = isinstance(tok, TokenList)
if (is_tl and last.token_type == 'dot' and
tok[0].token_type == 'cfws'):
res.append(TokenList(tok[1:]))
else:
res.append(tok)
last = res[-1]
last_is_tl = is_tl
res = TokenList(res[1:-1])
return res.value
class DomainLiteral(TokenList):
token_type = 'domain-literal'
@property
def domain(self):
return ''.join(super().value.split())
@property
def ip(self):
for x in self:
if x.token_type == 'ptext':
return x.value
class MIMEVersion(TokenList):
token_type = 'mime-version'
major = None
minor = None
class Parameter(TokenList):
token_type = 'parameter'
sectioned = False
extended = False
charset = 'us-ascii'
@property
def section_number(self):
# Because the first token, the attribute (name) eats CFWS, the second
# token is always the section if there is one.
return self[1].number if self.sectioned else 0
@property
def param_value(self):
# This is part of the "handle quoted extended parameters" hack.
for token in self:
if token.token_type == 'value':
return token.stripped_value
if token.token_type == 'quoted-string':
for token in token:
if token.token_type == 'bare-quoted-string':
for token in token:
if token.token_type == 'value':
return token.stripped_value
return ''
class InvalidParameter(Parameter):
token_type = 'invalid-parameter'
class Attribute(TokenList):
token_type = 'attribute'
@property
def stripped_value(self):
for token in self:
if token.token_type.endswith('attrtext'):
return token.value
class Section(TokenList):
token_type = 'section'
number = None
class Value(TokenList):
token_type = 'value'
@property
def stripped_value(self):
token = self[0]
if token.token_type == 'cfws':
token = self[1]
if token.token_type.endswith(
('quoted-string', 'attribute', 'extended-attribute')):
return token.stripped_value
return self.value
class MimeParameters(TokenList):
token_type = 'mime-parameters'
@property
def params(self):
# The RFC specifically states that the ordering of parameters is not
# guaranteed and may be reordered by the transport layer. So we have
# to assume the RFC 2231 pieces can come in any order. However, we
# output them in the order that we first see a given name, which gives
# us a stable __str__.
params = OrderedDict()
for token in self:
if not token.token_type.endswith('parameter'):
continue
if token[0].token_type != 'attribute':
continue
name = token[0].value.strip()
if name not in params:
params[name] = []
params[name].append((token.section_number, token))
for name, parts in params.items():
parts = sorted(parts, key=itemgetter(0))
first_param = parts[0][1]
charset = first_param.charset
# Our arbitrary error recovery is to ignore duplicate parameters,
# to use appearance order if there are duplicate rfc 2231 parts,
# and to ignore gaps. This mimics the error recovery of get_param.
if not first_param.extended and len(parts) > 1:
if parts[1][0] == 0:
parts[1][1].defects.append(errors.InvalidHeaderDefect(
'duplicate parameter name; duplicate(s) ignored'))
parts = parts[:1]
# Else assume the *0* was missing...note that this is different
# from get_param, but we registered a defect for this earlier.
value_parts = []
i = 0
for section_number, param in parts:
if section_number != i:
# We could get fancier here and look for a complete
# duplicate extended parameter and ignore the second one
# seen. But we're not doing that. The old code didn't.
if not param.extended:
param.defects.append(errors.InvalidHeaderDefect(
'duplicate parameter name; duplicate ignored'))
continue
else:
param.defects.append(errors.InvalidHeaderDefect(
"inconsistent RFC2231 parameter numbering"))
i += 1
value = param.param_value
if param.extended:
try:
value = urllib.parse.unquote_to_bytes(value)
except UnicodeEncodeError:
# source had surrogate escaped bytes. What we do now
# is a bit of an open question. I'm not sure this is
# the best choice, but it is what the old algorithm did
value = urllib.parse.unquote(value, encoding='latin-1')
else:
try:
value = value.decode(charset, 'surrogateescape')
except LookupError:
# XXX: there should really be a custom defect for
# unknown character set to make it easy to find,
# because otherwise unknown charset is a silent
# failure.
value = value.decode('us-ascii', 'surrogateescape')
if utils._has_surrogates(value):
param.defects.append(errors.UndecodableBytesDefect())
value_parts.append(value)
value = ''.join(value_parts)
yield name, value
def __str__(self):
params = []
for name, value in self.params:
if value:
params.append('{}={}'.format(name, quote_string(value)))
else:
params.append(name)
params = '; '.join(params)
return ' ' + params if params else ''
class ParameterizedHeaderValue(TokenList):
@property
def params(self):
for token in reversed(self):
if token.token_type == 'mime-parameters':
return token.params
return {}
@property
def parts(self):
if self and self[-1].token_type == 'mime-parameters':
# We don't want to start a new line if all of the params don't fit
# after the value, so unwrap the parameter list.
return TokenList(self[:-1] + self[-1])
return TokenList(self).parts
class ContentType(ParameterizedHeaderValue):
token_type = 'content-type'
maintype = 'text'
subtype = 'plain'
class ContentDisposition(ParameterizedHeaderValue):
token_type = 'content-disposition'
content_disposition = None
class ContentTransferEncoding(TokenList):
token_type = 'content-transfer-encoding'
cte = '7bit'
class HeaderLabel(TokenList):
token_type = 'header-label'
class Header(TokenList):
token_type = 'header'
def _fold(self, folded):
folded.append(str(self.pop(0)))
folded.lastlen = len(folded.current[0])
# The first line of the header is different from all others: we don't
# want to start a new object on a new line if it has any fold points in
# it that would allow part of it to be on the first header line.
# Further, if the first fold point would fit on the new line, we want
# to do that, but if it doesn't we want to put it on the first line.
# Folded supports this via the stickyspace attribute. If this
# attribute is not None, it does the special handling.
folded.stickyspace = str(self.pop(0)) if self[0].token_type == 'cfws' else ''
rest = self.pop(0)
if self:
raise ValueError("Malformed Header token list")
rest._fold(folded)
#
# Terminal classes and instances
#
class Terminal(str):
def __new__(cls, value, token_type):
self = super().__new__(cls, value)
self.token_type = token_type
self.defects = []
return self
def __repr__(self):
return "{}({})".format(self.__class__.__name__, super().__repr__())
@property
def all_defects(self):
return list(self.defects)
def _pp(self, indent=''):
return ["{}{}/{}({}){}".format(
indent,
self.__class__.__name__,
self.token_type,
super().__repr__(),
'' if not self.defects else ' {}'.format(self.defects),
)]
def cte_encode(self, charset, policy):
value = str(self)
try:
value.encode('us-ascii')
return value
except UnicodeEncodeError:
return _ew.encode(value, charset)
def pop_trailing_ws(self):
# This terminates the recursion.
return None
def pop_leading_fws(self):
# This terminates the recursion.
return None
@property
def comments(self):
return []
def has_leading_comment(self):
return False
def __getnewargs__(self):
return(str(self), self.token_type)
class WhiteSpaceTerminal(Terminal):
@property
def value(self):
return ' '
def startswith_fws(self):
return True
has_fws = True
class ValueTerminal(Terminal):
@property
def value(self):
return self
def startswith_fws(self):
return False
has_fws = False
def as_encoded_word(self, charset):
return _ew.encode(str(self), charset)
class EWWhiteSpaceTerminal(WhiteSpaceTerminal):
@property
def value(self):
return ''
@property
def encoded(self):
return self[:]
def __str__(self):
return ''
has_fws = True
# XXX these need to become classes and used as instances so
# that a program can't change them in a parse tree and screw
# up other parse trees. Maybe should have tests for that, too.
DOT = ValueTerminal('.', 'dot')
ListSeparator = ValueTerminal(',', 'list-separator')
RouteComponentMarker = ValueTerminal('@', 'route-component-marker')
#
# Parser
#
# Parse strings according to RFC822/2047/2822/5322 rules.
#
# This is a stateless parser. Each get_XXX function accepts a string and
# returns either a Terminal or a TokenList representing the RFC object named
# by the method and a string containing the remaining unparsed characters
# from the input. Thus a parser method consumes the next syntactic construct
# of a given type and returns a token representing the construct plus the
# unparsed remainder of the input string.
#
# For example, if the first element of a structured header is a 'phrase',
# then:
#
# phrase, value = get_phrase(value)
#
# returns the complete phrase from the start of the string value, plus any
# characters left in the string after the phrase is removed.
_wsp_splitter = re.compile(r'([{}]+)'.format(''.join(WSP))).split
_non_atom_end_matcher = re.compile(r"[^{}]+".format(
''.join(ATOM_ENDS).replace('\\','\\\\').replace(']','\]'))).match
_non_printable_finder = re.compile(r"[\x00-\x20\x7F]").findall
_non_token_end_matcher = re.compile(r"[^{}]+".format(
''.join(TOKEN_ENDS).replace('\\','\\\\').replace(']','\]'))).match
_non_attribute_end_matcher = re.compile(r"[^{}]+".format(
''.join(ATTRIBUTE_ENDS).replace('\\','\\\\').replace(']','\]'))).match
_non_extended_attribute_end_matcher = re.compile(r"[^{}]+".format(
''.join(EXTENDED_ATTRIBUTE_ENDS).replace(
'\\','\\\\').replace(']','\]'))).match
def _validate_xtext(xtext):
"""If input token contains ASCII non-printables, register a defect."""
non_printables = _non_printable_finder(xtext)
if non_printables:
xtext.defects.append(errors.NonPrintableDefect(non_printables))
if utils._has_surrogates(xtext):
xtext.defects.append(errors.UndecodableBytesDefect(
"Non-ASCII characters found in header token"))
def _get_ptext_to_endchars(value, endchars):
"""Scan printables/quoted-pairs until endchars and return unquoted ptext.
This function turns a run of qcontent, ccontent-without-comments, or
dtext-with-quoted-printables into a single string by unquoting any
quoted printables. It returns the string, the remaining value, and
a flag that is True iff there were any quoted printables decoded.
"""
fragment, *remainder = _wsp_splitter(value, 1)
vchars = []
escape = False
had_qp = False
for pos in range(len(fragment)):
if fragment[pos] == '\\':
if escape:
escape = False
had_qp = True
else:
escape = True
continue
if escape:
escape = False
elif fragment[pos] in endchars:
break
vchars.append(fragment[pos])
else:
pos = pos + 1
return ''.join(vchars), ''.join([fragment[pos:]] + remainder), had_qp
def get_fws(value):
"""FWS = 1*WSP
This isn't the RFC definition. We're using fws to represent tokens where
folding can be done, but when we are parsing the *un*folding has already
been done so we don't need to watch out for CRLF.
"""
newvalue = value.lstrip()
fws = WhiteSpaceTerminal(value[:len(value)-len(newvalue)], 'fws')
return fws, newvalue
def get_encoded_word(value):
""" encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
"""
ew = EncodedWord()
if not value.startswith('=?'):
raise errors.HeaderParseError(
"expected encoded word but found {}".format(value))
tok, *remainder = value[2:].split('?=', 1)
if tok == value[2:]:
raise errors.HeaderParseError(
"expected encoded word but found {}".format(value))
remstr = ''.join(remainder)
if len(remstr) > 1 and remstr[0] in hexdigits and remstr[1] in hexdigits:
# The ? after the CTE was followed by an encoded word escape (=XX).
rest, *remainder = remstr.split('?=', 1)
tok = tok + '?=' + rest
if len(tok.split()) > 1:
ew.defects.append(errors.InvalidHeaderDefect(
"whitespace inside encoded word"))
ew.cte = value
value = ''.join(remainder)
try:
text, charset, lang, defects = _ew.decode('=?' + tok + '?=')
except ValueError:
raise errors.HeaderParseError(
"encoded word format invalid: '{}'".format(ew.cte))
ew.charset = charset
ew.lang = lang
ew.defects.extend(defects)
while text:
if text[0] in WSP:
token, text = get_fws(text)
ew.append(token)
continue
chars, *remainder = _wsp_splitter(text, 1)
vtext = ValueTerminal(chars, 'vtext')
_validate_xtext(vtext)
ew.append(vtext)
text = ''.join(remainder)
return ew, value
def get_unstructured(value):
"""unstructured = (*([FWS] vchar) *WSP) / obs-unstruct
obs-unstruct = *((*LF *CR *(obs-utext) *LF *CR)) / FWS)
obs-utext = %d0 / obs-NO-WS-CTL / LF / CR
obs-NO-WS-CTL is control characters except WSP/CR/LF.
So, basically, we have printable runs, plus control characters or nulls in
the obsolete syntax, separated by whitespace. Since RFC 2047 uses the
obsolete syntax in its specification, but requires whitespace on either
side of the encoded words, I can see no reason to need to separate the
non-printable-non-whitespace from the printable runs if they occur, so we
parse this into xtext tokens separated by WSP tokens.
Because an 'unstructured' value must by definition constitute the entire
value, this 'get' routine does not return a remaining value, only the
parsed TokenList.
"""
# XXX: but what about bare CR and LF? They might signal the start or
# end of an encoded word. YAGNI for now, since our current parsers
# will never send us strings with bare CR or LF.
unstructured = UnstructuredTokenList()
while value:
if value[0] in WSP:
token, value = get_fws(value)
unstructured.append(token)
continue
if value.startswith('=?'):
try:
token, value = get_encoded_word(value)
except errors.HeaderParseError:
# XXX: Need to figure out how to register defects when
# appropriate here.
pass
else:
have_ws = True
if len(unstructured) > 0:
if unstructured[-1].token_type != 'fws':
unstructured.defects.append(errors.InvalidHeaderDefect(
"missing whitespace before encoded word"))
have_ws = False
if have_ws and len(unstructured) > 1:
if unstructured[-2].token_type == 'encoded-word':
unstructured[-1] = EWWhiteSpaceTerminal(
unstructured[-1], 'fws')
unstructured.append(token)
continue
tok, *remainder = _wsp_splitter(value, 1)
vtext = ValueTerminal(tok, 'vtext')
_validate_xtext(vtext)
unstructured.append(vtext)
value = ''.join(remainder)
return unstructured
def get_qp_ctext(value):
"""ctext = <printable ascii except \ ( )>
This is not the RFC ctext, since we are handling nested comments in comment
and unquoting quoted-pairs here. We allow anything except the '()'
characters, but if we find any ASCII other than the RFC defined printable
ASCII an NonPrintableDefect is added to the token's defects list. Since
quoted pairs are converted to their unquoted values, what is returned is
a 'ptext' token. In this case it is a WhiteSpaceTerminal, so it's value
is ' '.
"""
ptext, value, _ = _get_ptext_to_endchars(value, '()')
ptext = WhiteSpaceTerminal(ptext, 'ptext')
_validate_xtext(ptext)
return ptext, value
def get_qcontent(value):
"""qcontent = qtext / quoted-pair
We allow anything except the DQUOTE character, but if we find any ASCII
other than the RFC defined printable ASCII an NonPrintableDefect is
added to the token's defects list. Any quoted pairs are converted to their
unquoted values, so what is returned is a 'ptext' token. In this case it
is a ValueTerminal.
"""
ptext, value, _ = _get_ptext_to_endchars(value, '"')
ptext = ValueTerminal(ptext, 'ptext')
_validate_xtext(ptext)
return ptext, value
def get_atext(value):
"""atext = <matches _atext_matcher>
We allow any non-ATOM_ENDS in atext, but add an InvalidATextDefect to
the token's defects list if we find non-atext characters.
"""
m = _non_atom_end_matcher(value)
if not m:
raise errors.HeaderParseError(
"expected atext but found '{}'".format(value))
atext = m.group()
value = value[len(atext):]
atext = ValueTerminal(atext, 'atext')
_validate_xtext(atext)
return atext, value
def get_bare_quoted_string(value):
"""bare-quoted-string = DQUOTE *([FWS] qcontent) [FWS] DQUOTE
A quoted-string without the leading or trailing white space. Its
value is the text between the quote marks, with whitespace
preserved and quoted pairs decoded.
"""
if value[0] != '"':
raise errors.HeaderParseError(
"expected '\"' but found '{}'".format(value))
bare_quoted_string = BareQuotedString()
value = value[1:]
while value and value[0] != '"':
if value[0] in WSP:
token, value = get_fws(value)
elif value[:2] == '=?':
try:
token, value = get_encoded_word(value)
bare_quoted_string.defects.append(errors.InvalidHeaderDefect(
"encoded word inside quoted string"))
except errors.HeaderParseError:
token, value = get_qcontent(value)
else:
token, value = get_qcontent(value)
bare_quoted_string.append(token)
if not value:
bare_quoted_string.defects.append(errors.InvalidHeaderDefect(
"end of header inside quoted string"))
return bare_quoted_string, value
return bare_quoted_string, value[1:]
def get_comment(value):
"""comment = "(" *([FWS] ccontent) [FWS] ")"
ccontent = ctext / quoted-pair / comment
We handle nested comments here, and quoted-pair in our qp-ctext routine.
"""
if value and value[0] != '(':
raise errors.HeaderParseError(
"expected '(' but found '{}'".format(value))
comment = Comment()
value = value[1:]
while value and value[0] != ")":
if value[0] in WSP:
token, value = get_fws(value)
elif value[0] == '(':
token, value = get_comment(value)
else:
token, value = get_qp_ctext(value)
comment.append(token)
if not value:
comment.defects.append(errors.InvalidHeaderDefect(
"end of header inside comment"))
return comment, value
return comment, value[1:]
def get_cfws(value):
"""CFWS = (1*([FWS] comment) [FWS]) / FWS
"""
cfws = CFWSList()
while value and value[0] in CFWS_LEADER:
if value[0] in WSP:
token, value = get_fws(value)
else:
token, value = get_comment(value)
cfws.append(token)
return cfws, value
def get_quoted_string(value):
"""quoted-string = [CFWS] <bare-quoted-string> [CFWS]
'bare-quoted-string' is an intermediate class defined by this
parser and not by the RFC grammar. It is the quoted string
without any attached CFWS.
"""
quoted_string = QuotedString()
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
quoted_string.append(token)
token, value = get_bare_quoted_string(value)
quoted_string.append(token)
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
quoted_string.append(token)
return quoted_string, value
def get_atom(value):
"""atom = [CFWS] 1*atext [CFWS]
An atom could be an rfc2047 encoded word.
"""
atom = Atom()
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
atom.append(token)
if value and value[0] in ATOM_ENDS:
raise errors.HeaderParseError(
"expected atom but found '{}'".format(value))
if value.startswith('=?'):
try:
token, value = get_encoded_word(value)
except errors.HeaderParseError:
# XXX: need to figure out how to register defects when
# appropriate here.
token, value = get_atext(value)
else:
token, value = get_atext(value)
atom.append(token)
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
atom.append(token)
return atom, value
def get_dot_atom_text(value):
""" dot-text = 1*atext *("." 1*atext)
"""
dot_atom_text = DotAtomText()
if not value or value[0] in ATOM_ENDS:
raise errors.HeaderParseError("expected atom at a start of "
"dot-atom-text but found '{}'".format(value))
while value and value[0] not in ATOM_ENDS:
token, value = get_atext(value)
dot_atom_text.append(token)
if value and value[0] == '.':
dot_atom_text.append(DOT)
value = value[1:]
if dot_atom_text[-1] is DOT:
raise errors.HeaderParseError("expected atom at end of dot-atom-text "
"but found '{}'".format('.'+value))
return dot_atom_text, value
def get_dot_atom(value):
""" dot-atom = [CFWS] dot-atom-text [CFWS]
Any place we can have a dot atom, we could instead have an rfc2047 encoded
word.
"""
dot_atom = DotAtom()
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
dot_atom.append(token)
if value.startswith('=?'):
try:
token, value = get_encoded_word(value)
except errors.HeaderParseError:
# XXX: need to figure out how to register defects when
# appropriate here.
token, value = get_dot_atom_text(value)
else:
token, value = get_dot_atom_text(value)
dot_atom.append(token)
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
dot_atom.append(token)
return dot_atom, value
def get_word(value):
"""word = atom / quoted-string
Either atom or quoted-string may start with CFWS. We have to peel off this
CFWS first to determine which type of word to parse. Afterward we splice
the leading CFWS, if any, into the parsed sub-token.
If neither an atom or a quoted-string is found before the next special, a
HeaderParseError is raised.
The token returned is either an Atom or a QuotedString, as appropriate.
This means the 'word' level of the formal grammar is not represented in the
parse tree; this is because having that extra layer when manipulating the
parse tree is more confusing than it is helpful.
"""
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
else:
leader = None
if value[0]=='"':
token, value = get_quoted_string(value)
elif value[0] in SPECIALS:
raise errors.HeaderParseError("Expected 'atom' or 'quoted-string' "
"but found '{}'".format(value))
else:
token, value = get_atom(value)
if leader is not None:
token[:0] = [leader]
return token, value
def get_phrase(value):
""" phrase = 1*word / obs-phrase
obs-phrase = word *(word / "." / CFWS)
This means a phrase can be a sequence of words, periods, and CFWS in any
order as long as it starts with at least one word. If anything other than
words is detected, an ObsoleteHeaderDefect is added to the token's defect
list. We also accept a phrase that starts with CFWS followed by a dot;
this is registered as an InvalidHeaderDefect, since it is not supported by
even the obsolete grammar.
"""
phrase = Phrase()
try:
token, value = get_word(value)
phrase.append(token)
except errors.HeaderParseError:
phrase.defects.append(errors.InvalidHeaderDefect(
"phrase does not start with word"))
while value and value[0] not in PHRASE_ENDS:
if value[0]=='.':
phrase.append(DOT)
phrase.defects.append(errors.ObsoleteHeaderDefect(
"period in 'phrase'"))
value = value[1:]
else:
try:
token, value = get_word(value)
except errors.HeaderParseError:
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
phrase.defects.append(errors.ObsoleteHeaderDefect(
"comment found without atom"))
else:
raise
phrase.append(token)
return phrase, value
def get_local_part(value):
""" local-part = dot-atom / quoted-string / obs-local-part
"""
local_part = LocalPart()
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value:
raise errors.HeaderParseError(
"expected local-part but found '{}'".format(value))
try:
token, value = get_dot_atom(value)
except errors.HeaderParseError:
try:
token, value = get_word(value)
except errors.HeaderParseError:
if value[0] != '\\' and value[0] in PHRASE_ENDS:
raise
token = TokenList()
if leader is not None:
token[:0] = [leader]
local_part.append(token)
if value and (value[0]=='\\' or value[0] not in PHRASE_ENDS):
obs_local_part, value = get_obs_local_part(str(local_part) + value)
if obs_local_part.token_type == 'invalid-obs-local-part':
local_part.defects.append(errors.InvalidHeaderDefect(
"local-part is not dot-atom, quoted-string, or obs-local-part"))
else:
local_part.defects.append(errors.ObsoleteHeaderDefect(
"local-part is not a dot-atom (contains CFWS)"))
local_part[0] = obs_local_part
try:
local_part.value.encode('ascii')
except UnicodeEncodeError:
local_part.defects.append(errors.NonASCIILocalPartDefect(
"local-part contains non-ASCII characters)"))
return local_part, value
def get_obs_local_part(value):
""" obs-local-part = word *("." word)
"""
obs_local_part = ObsLocalPart()
last_non_ws_was_dot = False
while value and (value[0]=='\\' or value[0] not in PHRASE_ENDS):
if value[0] == '.':
if last_non_ws_was_dot:
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"invalid repeated '.'"))
obs_local_part.append(DOT)
last_non_ws_was_dot = True
value = value[1:]
continue
elif value[0]=='\\':
obs_local_part.append(ValueTerminal(value[0],
'misplaced-special'))
value = value[1:]
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"'\\' character outside of quoted-string/ccontent"))
last_non_ws_was_dot = False
continue
if obs_local_part and obs_local_part[-1].token_type != 'dot':
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"missing '.' between words"))
try:
token, value = get_word(value)
last_non_ws_was_dot = False
except errors.HeaderParseError:
if value[0] not in CFWS_LEADER:
raise
token, value = get_cfws(value)
obs_local_part.append(token)
if (obs_local_part[0].token_type == 'dot' or
obs_local_part[0].token_type=='cfws' and
obs_local_part[1].token_type=='dot'):
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"Invalid leading '.' in local part"))
if (obs_local_part[-1].token_type == 'dot' or
obs_local_part[-1].token_type=='cfws' and
obs_local_part[-2].token_type=='dot'):
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"Invalid trailing '.' in local part"))
if obs_local_part.defects:
obs_local_part.token_type = 'invalid-obs-local-part'
return obs_local_part, value
def get_dtext(value):
""" dtext = <printable ascii except \ [ ]> / obs-dtext
obs-dtext = obs-NO-WS-CTL / quoted-pair
We allow anything except the excluded characters, but if we find any
ASCII other than the RFC defined printable ASCII an NonPrintableDefect is
added to the token's defects list. Quoted pairs are converted to their
unquoted values, so what is returned is a ptext token, in this case a
ValueTerminal. If there were quoted-printables, an ObsoleteHeaderDefect is
added to the returned token's defect list.
"""
ptext, value, had_qp = _get_ptext_to_endchars(value, '[]')
ptext = ValueTerminal(ptext, 'ptext')
if had_qp:
ptext.defects.append(errors.ObsoleteHeaderDefect(
"quoted printable found in domain-literal"))
_validate_xtext(ptext)
return ptext, value
def _check_for_early_dl_end(value, domain_literal):
if value:
return False
domain_literal.append(errors.InvalidHeaderDefect(
"end of input inside domain-literal"))
domain_literal.append(ValueTerminal(']', 'domain-literal-end'))
return True
def get_domain_literal(value):
""" domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
"""
domain_literal = DomainLiteral()
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
domain_literal.append(token)
if not value:
raise errors.HeaderParseError("expected domain-literal")
if value[0] != '[':
raise errors.HeaderParseError("expected '[' at start of domain-literal "
"but found '{}'".format(value))
value = value[1:]
if _check_for_early_dl_end(value, domain_literal):
return domain_literal, value
domain_literal.append(ValueTerminal('[', 'domain-literal-start'))
if value[0] in WSP:
token, value = get_fws(value)
domain_literal.append(token)
token, value = get_dtext(value)
domain_literal.append(token)
if _check_for_early_dl_end(value, domain_literal):
return domain_literal, value
if value[0] in WSP:
token, value = get_fws(value)
domain_literal.append(token)
if _check_for_early_dl_end(value, domain_literal):
return domain_literal, value
if value[0] != ']':
raise errors.HeaderParseError("expected ']' at end of domain-literal "
"but found '{}'".format(value))
domain_literal.append(ValueTerminal(']', 'domain-literal-end'))
value = value[1:]
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
domain_literal.append(token)
return domain_literal, value
def get_domain(value):
""" domain = dot-atom / domain-literal / obs-domain
obs-domain = atom *("." atom))
"""
domain = Domain()
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value:
raise errors.HeaderParseError(
"expected domain but found '{}'".format(value))
if value[0] == '[':
token, value = get_domain_literal(value)
if leader is not None:
token[:0] = [leader]
domain.append(token)
return domain, value
try:
token, value = get_dot_atom(value)
except errors.HeaderParseError:
token, value = get_atom(value)
if leader is not None:
token[:0] = [leader]
domain.append(token)
if value and value[0] == '.':
domain.defects.append(errors.ObsoleteHeaderDefect(
"domain is not a dot-atom (contains CFWS)"))
if domain[0].token_type == 'dot-atom':
domain[:] = domain[0]
while value and value[0] == '.':
domain.append(DOT)
token, value = get_atom(value[1:])
domain.append(token)
return domain, value
def get_addr_spec(value):
""" addr-spec = local-part "@" domain
"""
addr_spec = AddrSpec()
token, value = get_local_part(value)
addr_spec.append(token)
if not value or value[0] != '@':
addr_spec.defects.append(errors.InvalidHeaderDefect(
"add-spec local part with no domain"))
return addr_spec, value
addr_spec.append(ValueTerminal('@', 'address-at-symbol'))
token, value = get_domain(value[1:])
addr_spec.append(token)
return addr_spec, value
def get_obs_route(value):
""" obs-route = obs-domain-list ":"
obs-domain-list = *(CFWS / ",") "@" domain *("," [CFWS] ["@" domain])
Returns an obs-route token with the appropriate sub-tokens (that is,
there is no obs-domain-list in the parse tree).
"""
obs_route = ObsRoute()
while value and (value[0]==',' or value[0] in CFWS_LEADER):
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
obs_route.append(token)
elif value[0] == ',':
obs_route.append(ListSeparator)
value = value[1:]
if not value or value[0] != '@':
raise errors.HeaderParseError(
"expected obs-route domain but found '{}'".format(value))
obs_route.append(RouteComponentMarker)
token, value = get_domain(value[1:])
obs_route.append(token)
while value and value[0]==',':
obs_route.append(ListSeparator)
value = value[1:]
if not value:
break
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
obs_route.append(token)
if value[0] == '@':
obs_route.append(RouteComponentMarker)
token, value = get_domain(value[1:])
obs_route.append(token)
if not value:
raise errors.HeaderParseError("end of header while parsing obs-route")
if value[0] != ':':
raise errors.HeaderParseError( "expected ':' marking end of "
"obs-route but found '{}'".format(value))
obs_route.append(ValueTerminal(':', 'end-of-obs-route-marker'))
return obs_route, value[1:]
def get_angle_addr(value):
""" angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
obs-angle-addr = [CFWS] "<" obs-route addr-spec ">" [CFWS]
"""
angle_addr = AngleAddr()
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
angle_addr.append(token)
if not value or value[0] != '<':
raise errors.HeaderParseError(
"expected angle-addr but found '{}'".format(value))
angle_addr.append(ValueTerminal('<', 'angle-addr-start'))
value = value[1:]
# Although it is not legal per RFC5322, SMTP uses '<>' in certain
# circumstances.
if value[0] == '>':
angle_addr.append(ValueTerminal('>', 'angle-addr-end'))
angle_addr.defects.append(errors.InvalidHeaderDefect(
"null addr-spec in angle-addr"))
value = value[1:]
return angle_addr, value
try:
token, value = get_addr_spec(value)
except errors.HeaderParseError:
try:
token, value = get_obs_route(value)
angle_addr.defects.append(errors.ObsoleteHeaderDefect(
"obsolete route specification in angle-addr"))
except errors.HeaderParseError:
raise errors.HeaderParseError(
"expected addr-spec or obs-route but found '{}'".format(value))
angle_addr.append(token)
token, value = get_addr_spec(value)
angle_addr.append(token)
if value and value[0] == '>':
value = value[1:]
else:
angle_addr.defects.append(errors.InvalidHeaderDefect(
"missing trailing '>' on angle-addr"))
angle_addr.append(ValueTerminal('>', 'angle-addr-end'))
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
angle_addr.append(token)
return angle_addr, value
def get_display_name(value):
""" display-name = phrase
Because this is simply a name-rule, we don't return a display-name
token containing a phrase, but rather a display-name token with
the content of the phrase.
"""
display_name = DisplayName()
token, value = get_phrase(value)
display_name.extend(token[:])
display_name.defects = token.defects[:]
return display_name, value
def get_name_addr(value):
""" name-addr = [display-name] angle-addr
"""
name_addr = NameAddr()
# Both the optional display name and the angle-addr can start with cfws.
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value:
raise errors.HeaderParseError(
"expected name-addr but found '{}'".format(leader))
if value[0] != '<':
if value[0] in PHRASE_ENDS:
raise errors.HeaderParseError(
"expected name-addr but found '{}'".format(value))
token, value = get_display_name(value)
if not value:
raise errors.HeaderParseError(
"expected name-addr but found '{}'".format(token))
if leader is not None:
token[0][:0] = [leader]
leader = None
name_addr.append(token)
token, value = get_angle_addr(value)
if leader is not None:
token[:0] = [leader]
name_addr.append(token)
return name_addr, value
def get_mailbox(value):
""" mailbox = name-addr / addr-spec
"""
# The only way to figure out if we are dealing with a name-addr or an
# addr-spec is to try parsing each one.
mailbox = Mailbox()
try:
token, value = get_name_addr(value)
except errors.HeaderParseError:
try:
token, value = get_addr_spec(value)
except errors.HeaderParseError:
raise errors.HeaderParseError(
"expected mailbox but found '{}'".format(value))
if any(isinstance(x, errors.InvalidHeaderDefect)
for x in token.all_defects):
mailbox.token_type = 'invalid-mailbox'
mailbox.append(token)
return mailbox, value
def get_invalid_mailbox(value, endchars):
""" Read everything up to one of the chars in endchars.
This is outside the formal grammar. The InvalidMailbox TokenList that is
returned acts like a Mailbox, but the data attributes are None.
"""
invalid_mailbox = InvalidMailbox()
while value and value[0] not in endchars:
if value[0] in PHRASE_ENDS:
invalid_mailbox.append(ValueTerminal(value[0],
'misplaced-special'))
value = value[1:]
else:
token, value = get_phrase(value)
invalid_mailbox.append(token)
return invalid_mailbox, value
def get_mailbox_list(value):
""" mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
obs-mbox-list = *([CFWS] ",") mailbox *("," [mailbox / CFWS])
For this routine we go outside the formal grammar in order to improve error
handling. We recognize the end of the mailbox list only at the end of the
value or at a ';' (the group terminator). This is so that we can turn
invalid mailboxes into InvalidMailbox tokens and continue parsing any
remaining valid mailboxes. We also allow all mailbox entries to be null,
and this condition is handled appropriately at a higher level.
"""
mailbox_list = MailboxList()
while value and value[0] != ';':
try:
token, value = get_mailbox(value)
mailbox_list.append(token)
except errors.HeaderParseError:
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value or value[0] in ',;':
mailbox_list.append(leader)
mailbox_list.defects.append(errors.ObsoleteHeaderDefect(
"empty element in mailbox-list"))
else:
token, value = get_invalid_mailbox(value, ',;')
if leader is not None:
token[:0] = [leader]
mailbox_list.append(token)
mailbox_list.defects.append(errors.InvalidHeaderDefect(
"invalid mailbox in mailbox-list"))
elif value[0] == ',':
mailbox_list.defects.append(errors.ObsoleteHeaderDefect(
"empty element in mailbox-list"))
else:
token, value = get_invalid_mailbox(value, ',;')
if leader is not None:
token[:0] = [leader]
mailbox_list.append(token)
mailbox_list.defects.append(errors.InvalidHeaderDefect(
"invalid mailbox in mailbox-list"))
if value and value[0] not in ',;':
# Crap after mailbox; treat it as an invalid mailbox.
# The mailbox info will still be available.
mailbox = mailbox_list[-1]
mailbox.token_type = 'invalid-mailbox'
token, value = get_invalid_mailbox(value, ',;')
mailbox.extend(token)
mailbox_list.defects.append(errors.InvalidHeaderDefect(
"invalid mailbox in mailbox-list"))
if value and value[0] == ',':
mailbox_list.append(ListSeparator)
value = value[1:]
return mailbox_list, value
def get_group_list(value):
""" group-list = mailbox-list / CFWS / obs-group-list
obs-group-list = 1*([CFWS] ",") [CFWS]
"""
group_list = GroupList()
if not value:
group_list.defects.append(errors.InvalidHeaderDefect(
"end of header before group-list"))
return group_list, value
leader = None
if value and value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value:
# This should never happen in email parsing, since CFWS-only is a
# legal alternative to group-list in a group, which is the only
# place group-list appears.
group_list.defects.append(errors.InvalidHeaderDefect(
"end of header in group-list"))
group_list.append(leader)
return group_list, value
if value[0] == ';':
group_list.append(leader)
return group_list, value
token, value = get_mailbox_list(value)
if len(token.all_mailboxes)==0:
if leader is not None:
group_list.append(leader)
group_list.extend(token)
group_list.defects.append(errors.ObsoleteHeaderDefect(
"group-list with empty entries"))
return group_list, value
if leader is not None:
token[:0] = [leader]
group_list.append(token)
return group_list, value
def get_group(value):
""" group = display-name ":" [group-list] ";" [CFWS]
"""
group = Group()
token, value = get_display_name(value)
if not value or value[0] != ':':
raise errors.HeaderParseError("expected ':' at end of group "
"display name but found '{}'".format(value))
group.append(token)
group.append(ValueTerminal(':', 'group-display-name-terminator'))
value = value[1:]
if value and value[0] == ';':
group.append(ValueTerminal(';', 'group-terminator'))
return group, value[1:]
token, value = get_group_list(value)
group.append(token)
if not value:
group.defects.append(errors.InvalidHeaderDefect(
"end of header in group"))
if value[0] != ';':
raise errors.HeaderParseError(
"expected ';' at end of group but found {}".format(value))
group.append(ValueTerminal(';', 'group-terminator'))
value = value[1:]
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
group.append(token)
return group, value
def get_address(value):
""" address = mailbox / group
Note that counter-intuitively, an address can be either a single address or
a list of addresses (a group). This is why the returned Address object has
a 'mailboxes' attribute which treats a single address as a list of length
one. When you need to differentiate between to two cases, extract the single
element, which is either a mailbox or a group token.
"""
# The formal grammar isn't very helpful when parsing an address. mailbox
# and group, especially when allowing for obsolete forms, start off very
# similarly. It is only when you reach one of @, <, or : that you know
# what you've got. So, we try each one in turn, starting with the more
# likely of the two. We could perhaps make this more efficient by looking
# for a phrase and then branching based on the next character, but that
# would be a premature optimization.
address = Address()
try:
token, value = get_group(value)
except errors.HeaderParseError:
try:
token, value = get_mailbox(value)
except errors.HeaderParseError:
raise errors.HeaderParseError(
"expected address but found '{}'".format(value))
address.append(token)
return address, value
def get_address_list(value):
""" address_list = (address *("," address)) / obs-addr-list
obs-addr-list = *([CFWS] ",") address *("," [address / CFWS])
We depart from the formal grammar here by continuing to parse until the end
of the input, assuming the input to be entirely composed of an
address-list. This is always true in email parsing, and allows us
to skip invalid addresses to parse additional valid ones.
"""
address_list = AddressList()
while value:
try:
token, value = get_address(value)
address_list.append(token)
except errors.HeaderParseError as err:
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value or value[0] == ',':
address_list.append(leader)
address_list.defects.append(errors.ObsoleteHeaderDefect(
"address-list entry with no content"))
else:
token, value = get_invalid_mailbox(value, ',')
if leader is not None:
token[:0] = [leader]
address_list.append(Address([token]))
address_list.defects.append(errors.InvalidHeaderDefect(
"invalid address in address-list"))
elif value[0] == ',':
address_list.defects.append(errors.ObsoleteHeaderDefect(
"empty element in address-list"))
else:
token, value = get_invalid_mailbox(value, ',')
if leader is not None:
token[:0] = [leader]
address_list.append(Address([token]))
address_list.defects.append(errors.InvalidHeaderDefect(
"invalid address in address-list"))
if value and value[0] != ',':
# Crap after address; treat it as an invalid mailbox.
# The mailbox info will still be available.
mailbox = address_list[-1][0]
mailbox.token_type = 'invalid-mailbox'
token, value = get_invalid_mailbox(value, ',')
mailbox.extend(token)
address_list.defects.append(errors.InvalidHeaderDefect(
"invalid address in address-list"))
if value: # Must be a , at this point.
address_list.append(ValueTerminal(',', 'list-separator'))
value = value[1:]
return address_list, value
#
# XXX: As I begin to add additional header parsers, I'm realizing we probably
# have two level of parser routines: the get_XXX methods that get a token in
# the grammar, and parse_XXX methods that parse an entire field value. So
# get_address_list above should really be a parse_ method, as probably should
# be get_unstructured.
#
def parse_mime_version(value):
""" mime-version = [CFWS] 1*digit [CFWS] "." [CFWS] 1*digit [CFWS]
"""
# The [CFWS] is implicit in the RFC 2045 BNF.
# XXX: This routine is a bit verbose, should factor out a get_int method.
mime_version = MIMEVersion()
if not value:
mime_version.defects.append(errors.HeaderMissingRequiredValue(
"Missing MIME version number (eg: 1.0)"))
return mime_version
if value[0] in CFWS_LEADER:
token, value = get_cfws(value)
mime_version.append(token)
if not value:
mime_version.defects.append(errors.HeaderMissingRequiredValue(
"Expected MIME version number but found only CFWS"))
digits = ''
while value and value[0] != '.' and value[0] not in CFWS_LEADER:
digits += value[0]
value = value[1:]
if not digits.isdigit():
mime_version.defects.append(errors.InvalidHeaderDefect(
"Expected MIME major version number but found {!r}".format(digits)))
mime_version.append(ValueTerminal(digits, 'xtext'))
else:
mime_version.major = int(digits)
mime_version.append(ValueTerminal(digits, 'digits'))
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
mime_version.append(token)
if not value or value[0] != '.':
if mime_version.major is not None:
mime_version.defects.append(errors.InvalidHeaderDefect(
"Incomplete MIME version; found only major number"))
if value:
mime_version.append(ValueTerminal(value, 'xtext'))
return mime_version
mime_version.append(ValueTerminal('.', 'version-separator'))
value = value[1:]
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
mime_version.append(token)
if not value:
if mime_version.major is not None:
mime_version.defects.append(errors.InvalidHeaderDefect(
"Incomplete MIME version; found only major number"))
return mime_version
digits = ''
while value and value[0] not in CFWS_LEADER:
digits += value[0]
value = value[1:]
if not digits.isdigit():
mime_version.defects.append(errors.InvalidHeaderDefect(
"Expected MIME minor version number but found {!r}".format(digits)))
mime_version.append(ValueTerminal(digits, 'xtext'))
else:
mime_version.minor = int(digits)
mime_version.append(ValueTerminal(digits, 'digits'))
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
mime_version.append(token)
if value:
mime_version.defects.append(errors.InvalidHeaderDefect(
"Excess non-CFWS text after MIME version"))
mime_version.append(ValueTerminal(value, 'xtext'))
return mime_version
def get_invalid_parameter(value):
""" Read everything up to the next ';'.
This is outside the formal grammar. The InvalidParameter TokenList that is
returned acts like a Parameter, but the data attributes are None.
"""
invalid_parameter = InvalidParameter()
while value and value[0] != ';':
if value[0] in PHRASE_ENDS:
invalid_parameter.append(ValueTerminal(value[0],
'misplaced-special'))
value = value[1:]
else:
token, value = get_phrase(value)
invalid_parameter.append(token)
return invalid_parameter, value
def get_ttext(value):
"""ttext = <matches _ttext_matcher>
We allow any non-TOKEN_ENDS in ttext, but add defects to the token's
defects list if we find non-ttext characters. We also register defects for
*any* non-printables even though the RFC doesn't exclude all of them,
because we follow the spirit of RFC 5322.
"""
m = _non_token_end_matcher(value)
if not m:
raise errors.HeaderParseError(
"expected ttext but found '{}'".format(value))
ttext = m.group()
value = value[len(ttext):]
ttext = ValueTerminal(ttext, 'ttext')
_validate_xtext(ttext)
return ttext, value
def get_token(value):
"""token = [CFWS] 1*ttext [CFWS]
The RFC equivalent of ttext is any US-ASCII chars except space, ctls, or
tspecials. We also exclude tabs even though the RFC doesn't.
The RFC implies the CFWS but is not explicit about it in the BNF.
"""
mtoken = Token()
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
mtoken.append(token)
if value and value[0] in TOKEN_ENDS:
raise errors.HeaderParseError(
"expected token but found '{}'".format(value))
token, value = get_ttext(value)
mtoken.append(token)
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
mtoken.append(token)
return mtoken, value
def get_attrtext(value):
"""attrtext = 1*(any non-ATTRIBUTE_ENDS character)
We allow any non-ATTRIBUTE_ENDS in attrtext, but add defects to the
token's defects list if we find non-attrtext characters. We also register
defects for *any* non-printables even though the RFC doesn't exclude all of
them, because we follow the spirit of RFC 5322.
"""
m = _non_attribute_end_matcher(value)
if not m:
raise errors.HeaderParseError(
"expected attrtext but found {!r}".format(value))
attrtext = m.group()
value = value[len(attrtext):]
attrtext = ValueTerminal(attrtext, 'attrtext')
_validate_xtext(attrtext)
return attrtext, value
def get_attribute(value):
""" [CFWS] 1*attrtext [CFWS]
This version of the BNF makes the CFWS explicit, and as usual we use a
value terminal for the actual run of characters. The RFC equivalent of
attrtext is the token characters, with the subtraction of '*', "'", and '%'.
We include tab in the excluded set just as we do for token.
"""
attribute = Attribute()
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
attribute.append(token)
if value and value[0] in ATTRIBUTE_ENDS:
raise errors.HeaderParseError(
"expected token but found '{}'".format(value))
token, value = get_attrtext(value)
attribute.append(token)
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
attribute.append(token)
return attribute, value
def get_extended_attrtext(value):
"""attrtext = 1*(any non-ATTRIBUTE_ENDS character plus '%')
This is a special parsing routine so that we get a value that
includes % escapes as a single string (which we decode as a single
string later).
"""
m = _non_extended_attribute_end_matcher(value)
if not m:
raise errors.HeaderParseError(
"expected extended attrtext but found {!r}".format(value))
attrtext = m.group()
value = value[len(attrtext):]
attrtext = ValueTerminal(attrtext, 'extended-attrtext')
_validate_xtext(attrtext)
return attrtext, value
def get_extended_attribute(value):
""" [CFWS] 1*extended_attrtext [CFWS]
This is like the non-extended version except we allow % characters, so that
we can pick up an encoded value as a single string.
"""
# XXX: should we have an ExtendedAttribute TokenList?
attribute = Attribute()
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
attribute.append(token)
if value and value[0] in EXTENDED_ATTRIBUTE_ENDS:
raise errors.HeaderParseError(
"expected token but found '{}'".format(value))
token, value = get_extended_attrtext(value)
attribute.append(token)
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
attribute.append(token)
return attribute, value
def get_section(value):
""" '*' digits
The formal BNF is more complicated because leading 0s are not allowed. We
check for that and add a defect. We also assume no CFWS is allowed between
the '*' and the digits, though the RFC is not crystal clear on that.
The caller should already have dealt with leading CFWS.
"""
section = Section()
if not value or value[0] != '*':
raise errors.HeaderParseError("Expected section but found {}".format(
value))
section.append(ValueTerminal('*', 'section-marker'))
value = value[1:]
if not value or not value[0].isdigit():
raise errors.HeaderParseError("Expected section number but "
"found {}".format(value))
digits = ''
while value and value[0].isdigit():
digits += value[0]
value = value[1:]
if digits[0] == '0' and digits != '0':
section.defects.append(errors.InvalidHeaderError("section number"
"has an invalid leading 0"))
section.number = int(digits)
section.append(ValueTerminal(digits, 'digits'))
return section, value
def get_value(value):
""" quoted-string / attribute
"""
v = Value()
if not value:
raise errors.HeaderParseError("Expected value but found end of string")
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value:
raise errors.HeaderParseError("Expected value but found "
"only {}".format(leader))
if value[0] == '"':
token, value = get_quoted_string(value)
else:
token, value = get_extended_attribute(value)
if leader is not None:
token[:0] = [leader]
v.append(token)
return v, value
def get_parameter(value):
""" attribute [section] ["*"] [CFWS] "=" value
The CFWS is implied by the RFC but not made explicit in the BNF. This
simplified form of the BNF from the RFC is made to conform with the RFC BNF
through some extra checks. We do it this way because it makes both error
recovery and working with the resulting parse tree easier.
"""
# It is possible CFWS would also be implicitly allowed between the section
# and the 'extended-attribute' marker (the '*') , but we've never seen that
# in the wild and we will therefore ignore the possibility.
param = Parameter()
token, value = get_attribute(value)
param.append(token)
if not value or value[0] == ';':
param.defects.append(errors.InvalidHeaderDefect("Parameter contains "
"name ({}) but no value".format(token)))
return param, value
if value[0] == '*':
try:
token, value = get_section(value)
param.sectioned = True
param.append(token)
except errors.HeaderParseError:
pass
if not value:
raise errors.HeaderParseError("Incomplete parameter")
if value[0] == '*':
param.append(ValueTerminal('*', 'extended-parameter-marker'))
value = value[1:]
param.extended = True
if value[0] != '=':
raise errors.HeaderParseError("Parameter not followed by '='")
param.append(ValueTerminal('=', 'parameter-separator'))
value = value[1:]
leader = None
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
param.append(token)
remainder = None
appendto = param
if param.extended and value and value[0] == '"':
# Now for some serious hackery to handle the common invalid case of
# double quotes around an extended value. We also accept (with defect)
# a value marked as encoded that isn't really.
qstring, remainder = get_quoted_string(value)
inner_value = qstring.stripped_value
semi_valid = False
if param.section_number == 0:
if inner_value and inner_value[0] == "'":
semi_valid = True
else:
token, rest = get_attrtext(inner_value)
if rest and rest[0] == "'":
semi_valid = True
else:
try:
token, rest = get_extended_attrtext(inner_value)
except:
pass
else:
if not rest:
semi_valid = True
if semi_valid:
param.defects.append(errors.InvalidHeaderDefect(
"Quoted string value for extended parameter is invalid"))
param.append(qstring)
for t in qstring:
if t.token_type == 'bare-quoted-string':
t[:] = []
appendto = t
break
value = inner_value
else:
remainder = None
param.defects.append(errors.InvalidHeaderDefect(
"Parameter marked as extended but appears to have a "
"quoted string value that is non-encoded"))
if value and value[0] == "'":
token = None
else:
token, value = get_value(value)
if not param.extended or param.section_number > 0:
if not value or value[0] != "'":
appendto.append(token)
if remainder is not None:
assert not value, value
value = remainder
return param, value
param.defects.append(errors.InvalidHeaderDefect(
"Apparent initial-extended-value but attribute "
"was not marked as extended or was not initial section"))
if not value:
# Assume the charset/lang is missing and the token is the value.
param.defects.append(errors.InvalidHeaderDefect(
"Missing required charset/lang delimiters"))
appendto.append(token)
if remainder is None:
return param, value
else:
if token is not None:
for t in token:
if t.token_type == 'extended-attrtext':
break
t.token_type == 'attrtext'
appendto.append(t)
param.charset = t.value
if value[0] != "'":
raise errors.HeaderParseError("Expected RFC2231 char/lang encoding "
"delimiter, but found {!r}".format(value))
appendto.append(ValueTerminal("'", 'RFC2231 delimiter'))
value = value[1:]
if value and value[0] != "'":
token, value = get_attrtext(value)
appendto.append(token)
param.lang = token.value
if not value or value[0] != "'":
raise errors.HeaderParseError("Expected RFC2231 char/lang encoding "
"delimiter, but found {}".format(value))
appendto.append(ValueTerminal("'", 'RFC2231 delimiter'))
value = value[1:]
if remainder is not None:
# Treat the rest of value as bare quoted string content.
v = Value()
while value:
if value[0] in WSP:
token, value = get_fws(value)
else:
token, value = get_qcontent(value)
v.append(token)
token = v
else:
token, value = get_value(value)
appendto.append(token)
if remainder is not None:
assert not value, value
value = remainder
return param, value
def parse_mime_parameters(value):
""" parameter *( ";" parameter )
That BNF is meant to indicate this routine should only be called after
finding and handling the leading ';'. There is no corresponding rule in
the formal RFC grammar, but it is more convenient for us for the set of
parameters to be treated as its own TokenList.
This is 'parse' routine because it consumes the reminaing value, but it
would never be called to parse a full header. Instead it is called to
parse everything after the non-parameter value of a specific MIME header.
"""
mime_parameters = MimeParameters()
while value:
try:
token, value = get_parameter(value)
mime_parameters.append(token)
except errors.HeaderParseError as err:
leader = None
if value[0] in CFWS_LEADER:
leader, value = get_cfws(value)
if not value:
mime_parameters.append(leader)
return mime_parameters
if value[0] == ';':
if leader is not None:
mime_parameters.append(leader)
mime_parameters.defects.append(errors.InvalidHeaderDefect(
"parameter entry with no content"))
else:
token, value = get_invalid_parameter(value)
if leader:
token[:0] = [leader]
mime_parameters.append(token)
mime_parameters.defects.append(errors.InvalidHeaderDefect(
"invalid parameter {!r}".format(token)))
if value and value[0] != ';':
# Junk after the otherwise valid parameter. Mark it as
# invalid, but it will have a value.
param = mime_parameters[-1]
param.token_type = 'invalid-parameter'
token, value = get_invalid_parameter(value)
param.extend(token)
mime_parameters.defects.append(errors.InvalidHeaderDefect(
"parameter with invalid trailing text {!r}".format(token)))
if value:
# Must be a ';' at this point.
mime_parameters.append(ValueTerminal(';', 'parameter-separator'))
value = value[1:]
return mime_parameters
def _find_mime_parameters(tokenlist, value):
"""Do our best to find the parameters in an invalid MIME header
"""
while value and value[0] != ';':
if value[0] in PHRASE_ENDS:
tokenlist.append(ValueTerminal(value[0], 'misplaced-special'))
value = value[1:]
else:
token, value = get_phrase(value)
tokenlist.append(token)
if not value:
return
tokenlist.append(ValueTerminal(';', 'parameter-separator'))
tokenlist.append(parse_mime_parameters(value[1:]))
def parse_content_type_header(value):
""" maintype "/" subtype *( ";" parameter )
The maintype and substype are tokens. Theoretically they could
be checked against the official IANA list + x-token, but we
don't do that.
"""
ctype = ContentType()
recover = False
if not value:
ctype.defects.append(errors.HeaderMissingRequiredValue(
"Missing content type specification"))
return ctype
try:
token, value = get_token(value)
except errors.HeaderParseError:
ctype.defects.append(errors.InvalidHeaderDefect(
"Expected content maintype but found {!r}".format(value)))
_find_mime_parameters(ctype, value)
return ctype
ctype.append(token)
# XXX: If we really want to follow the formal grammer we should make
# mantype and subtype specialized TokenLists here. Probably not worth it.
if not value or value[0] != '/':
ctype.defects.append(errors.InvalidHeaderDefect(
"Invalid content type"))
if value:
_find_mime_parameters(ctype, value)
return ctype
ctype.maintype = token.value.strip().lower()
ctype.append(ValueTerminal('/', 'content-type-separator'))
value = value[1:]
try:
token, value = get_token(value)
except errors.HeaderParseError:
ctype.defects.append(errors.InvalidHeaderDefect(
"Expected content subtype but found {!r}".format(value)))
_find_mime_parameters(ctype, value)
return ctype
ctype.append(token)
ctype.subtype = token.value.strip().lower()
if not value:
return ctype
if value[0] != ';':
ctype.defects.append(errors.InvalidHeaderDefect(
"Only parameters are valid after content type, but "
"found {!r}".format(value)))
# The RFC requires that a syntactically invalid content-type be treated
# as text/plain. Perhaps we should postel this, but we should probably
# only do that if we were checking the subtype value against IANA.
del ctype.maintype, ctype.subtype
_find_mime_parameters(ctype, value)
return ctype
ctype.append(ValueTerminal(';', 'parameter-separator'))
ctype.append(parse_mime_parameters(value[1:]))
return ctype
def parse_content_disposition_header(value):
""" disposition-type *( ";" parameter )
"""
disp_header = ContentDisposition()
if not value:
disp_header.defects.append(errors.HeaderMissingRequiredValue(
"Missing content disposition"))
return disp_header
try:
token, value = get_token(value)
except errors.HeaderParseError:
disp_header.defects.append(errors.InvalidHeaderDefect(
"Expected content disposition but found {!r}".format(value)))
_find_mime_parameters(disp_header, value)
return disp_header
disp_header.append(token)
disp_header.content_disposition = token.value.strip().lower()
if not value:
return disp_header
if value[0] != ';':
disp_header.defects.append(errors.InvalidHeaderDefect(
"Only parameters are valid after content disposition, but "
"found {!r}".format(value)))
_find_mime_parameters(disp_header, value)
return disp_header
disp_header.append(ValueTerminal(';', 'parameter-separator'))
disp_header.append(parse_mime_parameters(value[1:]))
return disp_header
def parse_content_transfer_encoding_header(value):
""" mechanism
"""
# We should probably validate the values, since the list is fixed.
cte_header = ContentTransferEncoding()
if not value:
cte_header.defects.append(errors.HeaderMissingRequiredValue(
"Missing content transfer encoding"))
return cte_header
try:
token, value = get_token(value)
except errors.HeaderParseError:
cte_header.defects.append(errors.InvalidHeaderDefect(
"Expected content transfer encoding but found {!r}".format(value)))
else:
cte_header.append(token)
cte_header.cte = token.value.strip().lower()
if not value:
return cte_header
while value:
cte_header.defects.append(errors.InvalidHeaderDefect(
"Extra text after content transfer encoding"))
if value[0] in PHRASE_ENDS:
cte_header.append(ValueTerminal(value[0], 'misplaced-special'))
value = value[1:]
else:
token, value = get_phrase(value)
cte_header.append(token)
return cte_header
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