/usr/share/pyshared/zope/server/http/httprequestparser.py is in python-zope.server 3.8.6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""HTTP Request Parser
This server uses asyncore to accept connections and do initial
processing but threads to do work.
"""
import re
from urllib import unquote
import urlparse
from zope.server.fixedstreamreceiver import FixedStreamReceiver
from zope.server.buffers import OverflowableBuffer
from zope.server.utilities import find_double_newline
from zope.server.interfaces import IStreamConsumer
from zope.interface import implements
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
class HTTPRequestParser(object):
"""A structure that collects the HTTP request.
Once the stream is completed, the instance is passed to
a server task constructor.
"""
implements(IStreamConsumer)
completed = 0 # Set once request is completed.
empty = 0 # Set if no request was made.
header_plus = ''
chunked = 0
content_length = 0
body_rcv = None
# Other attributes: first_line, header, headers, command, uri, version,
# path, query, fragment
# headers is a mapping containing keys translated to uppercase
# with dashes turned into underscores.
def __init__(self, adj):
"""
adj is an Adjustments object.
"""
self.headers = {}
self.adj = adj
def received(self, data):
"""
Receives the HTTP stream for one request.
Returns the number of bytes consumed.
Sets the completed flag once both the header and the
body have been received.
"""
if self.completed:
return 0 # Can't consume any more.
datalen = len(data)
br = self.body_rcv
if br is None:
# In header.
s = self.header_plus + data
index = find_double_newline(s)
if index >= 0:
# Header finished.
header_plus = s[:index]
consumed = len(data) - (len(s) - index)
self.in_header = 0
# Remove preceeding blank lines.
header_plus = header_plus.lstrip()
if not header_plus:
self.empty = 1
self.completed = 1
else:
self.parse_header(header_plus)
if self.body_rcv is None:
self.completed = 1
return consumed
else:
# Header not finished yet.
self.header_plus = s
return datalen
else:
# In body.
consumed = br.received(data)
if br.completed:
self.completed = 1
return consumed
def parse_header(self, header_plus):
"""
Parses the header_plus block of text (the headers plus the
first line of the request).
"""
index = header_plus.find('\n')
if index >= 0:
first_line = header_plus[:index].rstrip()
header = header_plus[index + 1:]
else:
first_line = header_plus.rstrip()
header = ''
self.first_line = first_line
self.header = header
lines = self.get_header_lines()
headers = self.headers
for line in lines:
index = line.find(':')
if index > 0:
key = line[:index]
value = line[index + 1:].strip()
key1 = key.upper().replace('-', '_')
# If a header already exists, we append subsequent values
# seperated by a comma. Applications already need to handle
# the comma seperated values, as HTTP front ends might do
# the concatenation for you (behavior specified in RFC2616).
try:
headers[key1] += ', %s' % value
except KeyError:
headers[key1] = value
# else there's garbage in the headers?
command, uri, version = self.crack_first_line()
self.command = str(command)
self.uri = str(uri)
self.version = version
self.split_uri()
if version == '1.1':
te = headers.get('TRANSFER_ENCODING', '')
if te == 'chunked':
from zope.server.http.chunking import ChunkedReceiver
self.chunked = 1
buf = OverflowableBuffer(self.adj.inbuf_overflow)
self.body_rcv = ChunkedReceiver(buf)
if not self.chunked:
try:
cl = int(headers.get('CONTENT_LENGTH', 0))
except ValueError:
cl = 0
self.content_length = cl
if cl > 0:
buf = OverflowableBuffer(self.adj.inbuf_overflow)
self.body_rcv = FixedStreamReceiver(cl, buf)
def get_header_lines(self):
"""
Splits the header into lines, putting multi-line headers together.
"""
r = []
lines = self.header.split('\n')
for line in lines:
if line and line[0] in ' \t':
r[-1] = r[-1] + line[1:]
else:
r.append(line)
return r
first_line_re = re.compile (
'([^ ]+) ((?:[^ :?#]+://[^ ?#/]*(?:[0-9]{1,5})?)?[^ ]+)(( HTTP/([0-9.]+))$|$)')
def crack_first_line(self):
r = self.first_line
m = self.first_line_re.match (r)
if m is not None and m.end() == len(r):
if m.group(3):
version = m.group(5)
else:
version = None
return m.group(1).upper(), m.group(2), version
else:
return None, None, None
def split_uri(self):
(self.proxy_scheme, self.proxy_netloc, path, self.query, self.fragment) = \
urlparse.urlsplit(self.uri)
if path and '%' in path:
path = unquote(path)
self.path = path
if self.query == '':
self.query = None
def getBodyStream(self):
body_rcv = self.body_rcv
if body_rcv is not None:
return body_rcv.getfile()
else:
return StringIO('')
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