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Mini Shell
# Copyright (C) 2004-2006 Python Software Foundation
# Authors: Baxter, Wouters and Warsaw
# Contact: email-sig@python.org
"""FeedParser - An email feed parser.
The feed parser implements an interface for incrementally parsing an email
message, line by line. This has advantages for certain applications, such
as
those reading email messages off a socket.
FeedParser.feed() is the primary interface for pushing new data into the
parser. It returns when there's nothing more it can do with the
available
data. When you have no more data to push into the parser, call .close().
This completes the parsing and returns the root message object.
The other advantage of this parser is that it will never raise a parsing
exception. Instead, when it finds something unexpected, it adds a
'defect' to
the current message. Defects are just instances that live on the message
object's .defects attribute.
"""
__all__ = ['FeedParser']
import re
from email import errors
from email import message
NLCRE = re.compile('\r\n|\r|\n')
NLCRE_bol = re.compile('(\r\n|\r|\n)')
NLCRE_eol = re.compile('(\r\n|\r|\n)\Z')
NLCRE_crack = re.compile('(\r\n|\r|\n)')
# RFC 2822 $3.6.8 Optional fields. ftext is %d33-57 / %d59-126, Any
character
# except controls, SP, and ":".
headerRE = re.compile(r'^(From |[\041-\071\073-\176]{1,}:|[\t
])')
EMPTYSTRING = ''
NL = '\n'
NeedMoreData = object()
class BufferedSubFile(object):
"""A file-ish object that can have new data loaded into
it.
You can also push and pop line-matching predicates onto a stack. When
the
current predicate matches the current line, a false EOF response
(i.e. empty string) is returned instead. This lets the parser adhere
to a
simple abstraction -- it parses until EOF closes the current message.
"""
def __init__(self):
# The last partial line pushed into this object.
self._partial = ''
# The list of full, pushed lines, in reverse order
self._lines = []
# The stack of false-EOF checking predicates.
self._eofstack = []
# A flag indicating whether the file has been closed or not.
self._closed = False
def push_eof_matcher(self, pred):
self._eofstack.append(pred)
def pop_eof_matcher(self):
return self._eofstack.pop()
def close(self):
# Don't forget any trailing partial line.
self._lines.append(self._partial)
self._partial = ''
self._closed = True
def readline(self):
if not self._lines:
if self._closed:
return ''
return NeedMoreData
# Pop the line off the stack and see if it matches the current
# false-EOF predicate.
line = self._lines.pop()
# RFC 2046, section 5.1.2 requires us to recognize outer level
# boundaries at any level of inner nesting. Do this, but be sure
it's
# in the order of most to least nested.
for ateof in self._eofstack[::-1]:
if ateof(line):
# We're at the false EOF. But push the last line back
first.
self._lines.append(line)
return ''
return line
def unreadline(self, line):
# Let the consumer push a line back into the buffer.
assert line is not NeedMoreData
self._lines.append(line)
def push(self, data):
"""Push some new data into this
object."""
# Handle any previous leftovers
data, self._partial = self._partial + data, ''
# Crack into lines, but preserve the newlines on the end of each
parts = NLCRE_crack.split(data)
# The *ahem* interesting behaviour of re.split when supplied
grouping
# parentheses is that the last element of the resulting list is the
# data after the final RE. In the case of a NL/CR terminated
string,
# this is the empty string.
self._partial = parts.pop()
#GAN 29Mar09 bugs 1555570, 1721862 Confusion at 8K boundary
ending with \r:
# is there a \n to follow later?
if not self._partial and parts and
parts[-1].endswith('\r'):
self._partial = parts.pop(-2)+parts.pop()
# parts is a list of strings, alternating between the line contents
# and the eol character(s). Gather up a list of lines after
# re-attaching the newlines.
lines = []
for i in range(len(parts) // 2):
lines.append(parts[i*2] + parts[i*2+1])
self.pushlines(lines)
def pushlines(self, lines):
# Reverse and insert at the front of the lines.
self._lines[:0] = lines[::-1]
def is_closed(self):
return self._closed
def __iter__(self):
return self
def next(self):
line = self.readline()
if line == '':
raise StopIteration
return line
class FeedParser:
"""A feed-style parser of email."""
def __init__(self, _factory=message.Message):
"""_factory is called with no arguments to create a
new message obj"""
self._factory = _factory
self._input = BufferedSubFile()
self._msgstack = []
self._parse = self._parsegen().next
self._cur = None
self._last = None
self._headersonly = False
# Non-public interface for supporting Parser's headersonly flag
def _set_headersonly(self):
self._headersonly = True
def feed(self, data):
"""Push more data into the parser."""
self._input.push(data)
self._call_parse()
def _call_parse(self):
try:
self._parse()
except StopIteration:
pass
def close(self):
"""Parse all remaining data and return the root
message object."""
self._input.close()
self._call_parse()
root = self._pop_message()
assert not self._msgstack
# Look for final set of defects
if root.get_content_maintype() == 'multipart' \
and not root.is_multipart():
root.defects.append(errors.MultipartInvariantViolationDefect())
return root
def _new_message(self):
msg = self._factory()
if self._cur and self._cur.get_content_type() ==
'multipart/digest':
msg.set_default_type('message/rfc822')
if self._msgstack:
self._msgstack[-1].attach(msg)
self._msgstack.append(msg)
self._cur = msg
self._last = msg
def _pop_message(self):
retval = self._msgstack.pop()
if self._msgstack:
self._cur = self._msgstack[-1]
else:
self._cur = None
return retval
def _parsegen(self):
# Create a new message and start by parsing headers.
self._new_message()
headers = []
# Collect the headers, searching for a line that doesn't match
the RFC
# 2822 header or continuation pattern (including an empty line).
for line in self._input:
if line is NeedMoreData:
yield NeedMoreData
continue
if not headerRE.match(line):
# If we saw the RFC defined header/body separator
# (i.e. newline), just throw it away. Otherwise the line is
# part of the body so push it back.
if not NLCRE.match(line):
self._input.unreadline(line)
break
headers.append(line)
# Done with the headers, so parse them and figure out what
we're
# supposed to see in the body of the message.
self._parse_headers(headers)
# Headers-only parsing is a backwards compatibility hack, which was
# necessary in the older parser, which could raise errors. All
# remaining lines in the input are thrown into the message body.
if self._headersonly:
lines = []
while True:
line = self._input.readline()
if line is NeedMoreData:
yield NeedMoreData
continue
if line == '':
break
lines.append(line)
self._cur.set_payload(EMPTYSTRING.join(lines))
return
if self._cur.get_content_type() ==
'message/delivery-status':
# message/delivery-status contains blocks of headers separated
by
# a blank line. We'll represent each header block as a
separate
# nested message object, but the processing is a bit different
# than standard message/* types because there is no body for
the
# nested messages. A blank line separates the subparts.
while True:
self._input.push_eof_matcher(NLCRE.match)
for retval in self._parsegen():
if retval is NeedMoreData:
yield NeedMoreData
continue
break
msg = self._pop_message()
# We need to pop the EOF matcher in order to tell if
we're at
# the end of the current file, not the end of the last
block
# of message headers.
self._input.pop_eof_matcher()
# The input stream must be sitting at the newline or at the
# EOF. We want to see if we're at the end of this
subpart, so
# first consume the blank line, then test the next line to
see
# if we're at this subpart's EOF.
while True:
line = self._input.readline()
if line is NeedMoreData:
yield NeedMoreData
continue
break
while True:
line = self._input.readline()
if line is NeedMoreData:
yield NeedMoreData
continue
break
if line == '':
break
# Not at EOF so this is a line we're going to need.
self._input.unreadline(line)
return
if self._cur.get_content_maintype() == 'message':
# The message claims to be a message/* type, then what follows
is
# another RFC 2822 message.
for retval in self._parsegen():
if retval is NeedMoreData:
yield NeedMoreData
continue
break
self._pop_message()
return
if self._cur.get_content_maintype() == 'multipart':
boundary = self._cur.get_boundary()
if boundary is None:
# The message /claims/ to be a multipart but it has not
# defined a boundary. That's a problem which
we'll handle by
# reading everything until the EOF and marking the message
as
# defective.
self._cur.defects.append(errors.NoBoundaryInMultipartDefect())
lines = []
for line in self._input:
if line is NeedMoreData:
yield NeedMoreData
continue
lines.append(line)
self._cur.set_payload(EMPTYSTRING.join(lines))
return
# Create a line match predicate which matches the inter-part
# boundary as well as the end-of-multipart boundary.
Don't push
# this onto the input stream until we've scanned past the
# preamble.
separator = '--' + boundary
boundaryre = re.compile(
'(?P<sep>' + re.escape(separator) +
r')(?P<end>--)?(?P<ws>[
\t]*)(?P<linesep>\r\n|\r|\n)?$')
capturing_preamble = True
preamble = []
linesep = False
while True:
line = self._input.readline()
if line is NeedMoreData:
yield NeedMoreData
continue
if line == '':
break
mo = boundaryre.match(line)
if mo:
# If we're looking at the end boundary, we're
done with
# this multipart. If there was a newline at the end of
# the closing boundary, then we need to initialize the
# epilogue with the empty string (see below).
if mo.group('end'):
linesep = mo.group('linesep')
break
# We saw an inter-part boundary. Were we in the
preamble?
if capturing_preamble:
if preamble:
# According to RFC 2046, the last newline
belongs
# to the boundary.
lastline = preamble[-1]
eolmo = NLCRE_eol.search(lastline)
if eolmo:
preamble[-1] =
lastline[:-len(eolmo.group(0))]
self._cur.preamble = EMPTYSTRING.join(preamble)
capturing_preamble = False
self._input.unreadline(line)
continue
# We saw a boundary separating two parts. Consume any
# multiple boundary lines that may be following. Our
# interpretation of RFC 2046 BNF grammar does not
produce
# body parts within such double boundaries.
while True:
line = self._input.readline()
if line is NeedMoreData:
yield NeedMoreData
continue
mo = boundaryre.match(line)
if not mo:
self._input.unreadline(line)
break
# Recurse to parse this subpart; the input stream
points
# at the subpart's first line.
self._input.push_eof_matcher(boundaryre.match)
for retval in self._parsegen():
if retval is NeedMoreData:
yield NeedMoreData
continue
break
# Because of RFC 2046, the newline preceding the
boundary
# separator actually belongs to the boundary, not the
# previous subpart's payload (or epilogue if the
previous
# part is a multipart).
if self._last.get_content_maintype() ==
'multipart':
epilogue = self._last.epilogue
if epilogue == '':
self._last.epilogue = None
elif epilogue is not None:
mo = NLCRE_eol.search(epilogue)
if mo:
end = len(mo.group(0))
self._last.epilogue = epilogue[:-end]
else:
payload = self._last.get_payload()
if isinstance(payload, basestring):
mo = NLCRE_eol.search(payload)
if mo:
payload = payload[:-len(mo.group(0))]
self._last.set_payload(payload)
self._input.pop_eof_matcher()
self._pop_message()
# Set the multipart up for newline cleansing, which
will
# happen if we're in a nested multipart.
self._last = self._cur
else:
# I think we must be in the preamble
assert capturing_preamble
preamble.append(line)
# We've seen either the EOF or the end boundary. If
we're still
# capturing the preamble, we never saw the start boundary.
Note
# that as a defect and store the captured text as the payload.
# Everything from here to the EOF is epilogue.
if capturing_preamble:
self._cur.defects.append(errors.StartBoundaryNotFoundDefect())
self._cur.set_payload(EMPTYSTRING.join(preamble))
epilogue = []
for line in self._input:
if line is NeedMoreData:
yield NeedMoreData
continue
self._cur.epilogue = EMPTYSTRING.join(epilogue)
return
# If the end boundary ended in a newline, we'll need to
make sure
# the epilogue isn't None
if linesep:
epilogue = ['']
else:
epilogue = []
for line in self._input:
if line is NeedMoreData:
yield NeedMoreData
continue
epilogue.append(line)
# Any CRLF at the front of the epilogue is not technically part
of
# the epilogue. Also, watch out for an empty string epilogue,
# which means a single newline.
if epilogue:
firstline = epilogue[0]
bolmo = NLCRE_bol.match(firstline)
if bolmo:
epilogue[0] = firstline[len(bolmo.group(0)):]
self._cur.epilogue = EMPTYSTRING.join(epilogue)
return
# Otherwise, it's some non-multipart type, so the entire rest
of the
# file contents becomes the payload.
lines = []
for line in self._input:
if line is NeedMoreData:
yield NeedMoreData
continue
lines.append(line)
self._cur.set_payload(EMPTYSTRING.join(lines))
def _parse_headers(self, lines):
# Passed a list of lines that make up the headers for the current
msg
lastheader = ''
lastvalue = []
for lineno, line in enumerate(lines):
# Check for continuation
if line[0] in ' \t':
if not lastheader:
# The first line of the headers was a continuation.
This
# is illegal, so let's note the defect, store the
illegal
# line, and ignore it for purposes of headers.
defect =
errors.FirstHeaderLineIsContinuationDefect(line)
self._cur.defects.append(defect)
continue
lastvalue.append(line)
continue
if lastheader:
# XXX reconsider the joining of folded lines
lhdr =
EMPTYSTRING.join(lastvalue)[:-1].rstrip('\r\n')
self._cur[lastheader] = lhdr
lastheader, lastvalue = '', []
# Check for envelope header, i.e. unix-from
if line.startswith('From '):
if lineno == 0:
# Strip off the trailing newline
mo = NLCRE_eol.search(line)
if mo:
line = line[:-len(mo.group(0))]
self._cur.set_unixfrom(line)
continue
elif lineno == len(lines) - 1:
# Something looking like a unix-from at the end -
it's
# probably the first line of the body, so push back the
# line and stop.
self._input.unreadline(line)
return
else:
# Weirdly placed unix-from line. Note this as a defect
# and ignore it.
defect = errors.MisplacedEnvelopeHeaderDefect(line)
self._cur.defects.append(defect)
continue
# Split the line on the colon separating field name from value.
i = line.find(':')
if i < 0:
defect = errors.MalformedHeaderDefect(line)
self._cur.defects.append(defect)
continue
lastheader = line[:i]
lastvalue = [line[i+1:].lstrip()]
# Done with all the lines, so handle the last header.
if lastheader:
# XXX reconsider the joining of folded lines
self._cur[lastheader] =
EMPTYSTRING.join(lastvalue).rstrip('\r\n')