webinterface_handler_wsgi_utils.py
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webinterface_handler_wsgi_utils.py
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	# -- coding: utf-8 --
	## This file is part of Invenio.
	## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 CERN.
	##
	## Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	"""
	mod_python->WSGI Framework utilities

	This code has been taken from mod_python original source code and rearranged
	here to easying the migration from mod_python to wsgi.

	The code taken from mod_python is under the following License.
	"""

	# Copyright 2004 Apache Software Foundation
	#
	# Licensed under the Apache License, Version 2.0 (the "License"); you
	# may not use this file except in compliance with the License. You
	# may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
	# implied. See the License for the specific language governing
	# permissions and limitations under the License.
	#
	# Originally developed by Gregory Trubetskoy.
	#
	# $Id: apache.py 468216 2006-10-27 00:54:12Z grahamd $

	try:
	import threading
	except:
	import dummy_threading as threading
	from wsgiref.headers import Headers
	import time
	import re
	import os
	import cgi
	import cStringIO
	import tempfile
	from types import TypeType, ClassType, BuiltinFunctionType, MethodType, ListType
	from invenio.config import CFG_TMPDIR
	from invenio.webinterface_handler_config import \
	SERVER_RETURN, \
	HTTP_LENGTH_REQUIRED, \
	HTTP_BAD_REQUEST, \
	InvenioWebInterfaceWSGIContentLenghtError, \
	InvenioWebInterfaceWSGIContentTypeError, \
	InvenioWebInterfaceWSGIContentMD5Error

	# Cache for values of PythonPath that have been seen already.
	_path_cache = {}
	_path_cache_lock = threading.Lock()

	class table(Headers):
	add = Headers.add_header
	iteritems = Headers.items
	def __getitem__(self, name):
	ret = Headers.__getitem__(self, name)
	if ret is None:
	return ''
	else:
	return str(ret)


	## Some functions made public
	exists_config_define = lambda dummy: True

	## Some constants


	class metaCookie(type):

	def __new__(cls, clsname, bases, clsdict):

	_valid_attr = (
	"version", "path", "domain", "secure",
	"comment", "expires", "max_age",
	# RFC 2965
	"commentURL", "discard", "port",
	# Microsoft Extension
	"httponly" )

	# _valid_attr + property values
	# (note __slots__ is a new Python feature, it
	# prevents any other attribute from being set)
	__slots__ = _valid_attr + ("name", "value", "_value",
	"_expires", "__data__")

	clsdict["_valid_attr"] = _valid_attr
	clsdict["__slots__"] = __slots__

	def set_expires(self, value):

	if type(value) == type(""):
	# if it's a string, it should be
	# valid format as per Netscape spec
	try:
	t = time.strptime(value, "%a, %d-%b-%Y %H:%M:%S GMT")
	except ValueError:
	raise ValueError, "Invalid expires time: %s" % value
	t = time.mktime(t)
	else:
	# otherwise assume it's a number
	# representing time as from time.time()
	t = value
	value = time.strftime("%a, %d-%b-%Y %H:%M:%S GMT",
	time.gmtime(t))

	self._expires = "%s" % value

	def get_expires(self):
	return self._expires

	clsdict["expires"] = property(fget=get_expires, fset=set_expires)

	return type.__new__(cls, clsname, bases, clsdict)

	class Cookie(object):
	"""
	This class implements the basic Cookie functionality. Note that
	unlike the Python Standard Library Cookie class, this class represents
	a single cookie (not a list of Morsels).
	"""

	__metaclass__ = metaCookie

	DOWNGRADE = 0
	IGNORE = 1
	EXCEPTION = 3

	def parse(Class, str, **kw):
	"""
	Parse a Cookie or Set-Cookie header value, and return
	a dict of Cookies. Note: the string should NOT include the
	header name, only the value.
	"""

	dict = _parse_cookie(str, Class, **kw)
	return dict

	parse = classmethod(parse)

	def __init__(self, name, value, **kw):

	"""
	This constructor takes at least a name and value as the
	arguments, as well as optionally any of allowed cookie attributes
	as defined in the existing cookie standards.
	"""
	self.name, self.value = name, value

	for k in kw:
	setattr(self, k.lower(), kw[k])

	# subclasses can use this for internal stuff
	self.__data__ = {}


	def __str__(self):

	"""
	Provides the string representation of the Cookie suitable for
	sending to the browser. Note that the actual header name will
	not be part of the string.

	This method makes no attempt to automatically double-quote
	strings that contain special characters, even though the RFC's
	dictate this. This is because doing so seems to confuse most
	browsers out there.
	"""

	result = ["%s=%s" % (self.name, self.value)]
	# pylint: disable=E1101
	# The attribute _valid_attr is provided by the metaclass 'metaCookie'.
	for name in self._valid_attr:
	if hasattr(self, name):
	if name in ("secure", "discard", "httponly"):
	result.append(name)
	else:
	result.append("%s=%s" % (name, getattr(self, name)))
	# pylint: enable=E1101
	return "; ".join(result)

	def __repr__(self):
	return '<%s: %s>' % (self.__class__.__name__,
	str(self))

	# This is a simplified and in some places corrected
	# (at least I think it is) pattern from standard lib Cookie.py

	_cookiePattern = re.compile(
	r"(?x)" # Verbose pattern
	r"[,\ ]*" # space/comma (RFC2616 4.2) before attr-val is eaten
	r"(?P<key>" # Start of group 'key'
	r"[^;\ =]+" # anything but ';', ' ' or '='
	r")" # End of group 'key'
	r"\ (=\ )?" # a space, then may be "=", more space
	r"(?P<val>" # Start of group 'val'
	r'"(?:[^\\"]\|\\.)*"' # a doublequoted string
	r"\|" # or
	r"[^;]*" # any word or empty string
	r")" # End of group 'val'
	r"\s*;?" # probably ending in a semi-colon
	)

	def _parse_cookie(str, Class, names=None):
	# XXX problem is we should allow duplicate
	# strings
	result = {}

	matchIter = _cookiePattern.finditer(str)

	for match in matchIter:
	key, val = match.group("key"), match.group("val")

	# We just ditch the cookies names which start with a dollar sign since
	# those are in fact RFC2965 cookies attributes. See bug [#MODPYTHON-3].
	if key[0] != '$' and names is None or key in names:
	result[key] = Class(key, val)

	return result

	_RE_BAD_MSIE = re.compile("MSIE\s+(\d+\.\d+)")
	def add_cookie(req, cookie, value="", **kw):
	"""
	Sets a cookie in outgoing headers and adds a cache
	directive so that caches don't cache the cookie.
	"""

	# is this a cookie?
	if not isinstance(cookie, Cookie):

	# make a cookie
	cookie = Cookie(cookie, value, **kw)

	if not req.headers_out.has_key("Set-Cookie"):
	g = _RE_BAD_MSIE.search(req.headers_in.get('User-Agent', "MSIE 6.0"))
	bad_msie = g and float(g.group(1)) < 9.0
	if not (bad_msie and req.is_https()):
	req.headers_out.add("Cache-Control", 'no-cache="set-cookie"')

	req.headers_out.add("Set-Cookie", str(cookie))

	def get_cookies(req, Class=Cookie, **kw):
	"""
	A shorthand for retrieveing and parsing cookies given
	a Cookie class. The class must be one of the classes from
	this module.
	"""

	if not req.headers_in.has_key("cookie"):
	return {}

	cookies = req.headers_in["cookie"]
	if type(cookies) == type([]):
	cookies = '; '.join(cookies)

	return Class.parse(cookies, **kw)

	def get_cookie(req, name, Class=Cookie, **kw):
	cookies = get_cookies(req, Class, names=[name], **kw)
	if cookies.has_key(name):
	return cookies[name]


	parse_qs = cgi.parse_qs
	parse_qsl = cgi.parse_qsl

	# Maximum line length for reading. (64KB)
	# Fixes memory error when upload large files such as 700+MB ISOs.
	readBlockSize = 65368

	""" The classes below are a (almost) a drop-in replacement for the
	standard cgi.py FieldStorage class. They should have pretty much the
	same functionality.

	These classes differ in that unlike cgi.FieldStorage, they are not
	recursive. The class FieldStorage contains a list of instances of
	Field class. Field class is incapable of storing anything in it.

	These objects should be considerably faster than the ones in cgi.py
	because they do not expect CGI environment, and are
	optimized specifically for Apache and mod_python.
	"""

	class Field:
	def __init__(self, name, args, *kwargs):
	self.name = name

	# Some third party packages such as Trac create
	# instances of the Field object and insert it
	# directly into the list of form fields. To
	# maintain backward compatibility check for
	# where more than just a field name is supplied
	# and invoke an additional initialisation step
	# to process the arguments. Ideally, third party
	# code should use the add_field() method of the
	# form, but if they need to maintain backward
	# compatibility with older versions of mod_python
	# they will not have a choice but to use old
	# way of doing things and thus we need this code
	# for the forseeable future to cope with that.

	if args or kwargs:
	self.__bc_init__(args, *kwargs)

	def __bc_init__(self, file, ctype, type_options,
	disp, disp_options, headers = {}):
	self.file = file
	self.type = ctype
	self.type_options = type_options
	self.disposition = disp
	self.disposition_options = disp_options
	if disp_options.has_key("filename"):
	self.filename = disp_options["filename"]
	else:
	self.filename = None
	self.headers = headers

	def __repr__(self):
	"""Return printable representation."""
	return "Field(%s, %s)" % (`self.name`, `self.value`)

	def __getattr__(self, name):
	if name != 'value':
	raise AttributeError, name
	if self.file:
	self.file.seek(0)
	value = self.file.read()
	self.file.seek(0)
	else:
	value = None
	return value

	def __del__(self):
	self.file.close()

	class StringField(str):
	""" This class is basically a string with
	added attributes for compatibility with std lib cgi.py. Basically, this
	works the opposite of Field, as it stores its data in a string, but creates
	a file on demand. Field creates a value on demand and stores data in a file.
	"""
	filename = None
	headers = {}
	ctype = "text/plain"
	type_options = {}
	disposition = None
	disp_options = None

	# I wanted __init__(name, value) but that does not work (apparently, you
	# cannot subclass str with a constructor that takes >1 argument)
	def __init__(self, value):
	'''Create StringField instance. You'll have to set name yourself.'''
	str.__init__(self, value)
	self.value = value

	def __getattr__(self, name):
	if name != 'file':
	raise AttributeError, name
	self.file = cStringIO.StringIO(self.value)
	return self.file

	def __repr__(self):
	"""Return printable representation (to pass unit tests)."""
	return "Field(%s, %s)" % (`self.name`, `self.value`)

	class FieldList(list):

	def __init__(self):
	self.__table = None
	list.__init__(self)

	def table(self):
	if self.__table is None:
	self.__table = {}
	for item in self:
	if item.name in self.__table:
	self.__table[item.name].append(item)
	else:
	self.__table[item.name] = [item]
	return self.__table

	def __delitem__(self, *args):
	self.__table = None
	return list.__delitem__(self, *args)

	def __delslice__(self, *args):
	self.__table = None
	return list.__delslice__(self, *args)

	def __iadd__(self, *args):
	self.__table = None
	return list.__iadd__(self, *args)

	def __imul__(self, *args):
	self.__table = None
	return list.__imul__(self, *args)

	def __setitem__(self, *args):
	self.__table = None
	return list.__setitem__(self, *args)

	def __setslice__(self, *args):
	self.__table = None
	return list.__setslice__(self, *args)

	def append(self, *args):
	self.__table = None
	return list.append(self, *args)

	def extend(self, *args):
	self.__table = None
	return list.extend(self, *args)

	def insert(self, *args):
	self.__table = None
	return list.insert(self, *args)

	def pop(self, *args):
	self.__table = None
	return list.pop(self, *args)

	def remove(self, *args):
	self.__table = None
	return list.remove(self, *args)


	class FieldStorage:

	def __init__(self, req, keep_blank_values=0, strict_parsing=0, file_callback=None, field_callback=None):
	#
	# Whenever readline is called ALWAYS use the max size EVEN when
	# not expecting a long line. - this helps protect against
	# malformed content from exhausting memory.
	#

	self.list = FieldList()
	self.wsgi_input_consumed = True

	# always process GET-style parameters
	if req.args:
	pairs = parse_qsl(req.args, keep_blank_values)
	for pair in pairs:
	self.add_field(pair[0], pair[1])
	if req.method != "POST":
	return

	try:
	clen = int(req.headers_in["content-length"])
	except (KeyError, ValueError):
	# absent content-length is not acceptable
	raise SERVER_RETURN, HTTP_LENGTH_REQUIRED

	self.clen = clen
	self.count = 0
	if not req.headers_in.has_key("content-type"):
	ctype = "application/x-www-form-urlencoded"
	else:
	ctype = req.headers_in["content-type"]

	if ctype.startswith("application/x-www-form-urlencoded"):
	pairs = parse_qsl(req.read(clen), keep_blank_values)
	for pair in pairs:
	self.add_field(pair[0], pair[1])
	return


	if not ctype.startswith("multipart/"):
	# we don't understand this content-type
	self.wsgi_input_consumed = False
	return

	# figure out boundary
	try:
	i = ctype.lower().rindex("boundary=")
	boundary = ctype[i+9:]
	if len(boundary) >= 2 and boundary[0] == boundary[-1] == '"':
	boundary = boundary[1:-1]
	boundary = re.compile("--" + re.escape(boundary) + "(--)?\r?\n")

	except ValueError:
	raise SERVER_RETURN, HTTP_BAD_REQUEST

	# read until boundary
	self.read_to_boundary(req, boundary, None)

	end_of_stream = False
	while not end_of_stream and not self.eof(): # jjj JIM BEGIN WHILE
	## parse headers

	ctype, type_options = "text/plain", {}
	disp, disp_options = None, {}
	headers = table([])
	line = req.readline(readBlockSize)
	self.count += len(line)
	if self.eof():
	end_of_stream = True
	match = boundary.match(line)
	if (not line) or match:
	# we stop if we reached the end of the stream or a stop
	# boundary (which means '--' after the boundary) we
	# continue to the next part if we reached a simple
	# boundary in either case this would mean the entity is
	# malformed, but we're tolerating it anyway.
	end_of_stream = (not line) or (match.group(1) is not None)
	continue

	skip_this_part = False
	while line not in ('\r','\r\n'):
	nextline = req.readline(readBlockSize)
	self.count += len(nextline)
	if self.eof():
	end_of_stream = True
	while nextline and nextline[0] in [ ' ', '\t']:
	line = line + nextline
	nextline = req.readline(readBlockSize)
	self.count += len(nextline)
	if self.eof():
	end_of_stream = True
	# we read the headers until we reach an empty line
	# NOTE : a single \n would mean the entity is malformed, but
	# we're tolerating it anyway
	h, v = line.split(":", 1)
	headers.add(h, v)
	h = h.lower()
	if h == "content-disposition":
	disp, disp_options = parse_header(v)
	elif h == "content-type":
	ctype, type_options = parse_header(v)
	#
	# NOTE: FIX up binary rubbish sent as content type
	# from Microsoft IE 6.0 when sending a file which
	# does not have a suffix.
	#
	if ctype.find('/') == -1:
	ctype = 'application/octet-stream'

	line = nextline
	match = boundary.match(line)
	if (not line) or match:
	# we stop if we reached the end of the stream or a
	# stop boundary (which means '--' after the
	# boundary) we continue to the next part if we
	# reached a simple boundary in either case this
	# would mean the entity is malformed, but we're
	# tolerating it anyway.
	skip_this_part = True
	end_of_stream = (not line) or (match.group(1) is not None)
	break

	if skip_this_part:
	continue

	if disp_options.has_key("name"):
	name = disp_options["name"]
	else:
	name = None

	# create a file object
	# is this a file?
	if disp_options.has_key("filename"):
	if file_callback and callable(file_callback):
	file = file_callback(disp_options["filename"])
	else:
	file = tempfile.TemporaryFile("w+b")
	else:
	if field_callback and callable(field_callback):
	file = field_callback()
	else:
	file = cStringIO.StringIO()

	# read it in
	self.read_to_boundary(req, boundary, file)
	if self.eof():
	end_of_stream = True
	file.seek(0)

	# make a Field
	if disp_options.has_key("filename"):
	field = Field(name)
	field.filename = disp_options["filename"]
	else:
	field = StringField(file.read())
	field.name = name
	field.file = file
	field.type = ctype
	field.type_options = type_options
	field.disposition = disp
	field.disposition_options = disp_options
	field.headers = headers
	self.list.append(field)

	def add_field(self, key, value):
	"""Insert a field as key/value pair"""
	item = StringField(value)
	item.name = key
	self.list.append(item)

	def __setitem__(self, key, value):
	table = self.list.table()
	if table.has_key(key):
	items = table[key]
	for item in items:
	self.list.remove(item)
	item = StringField(value)
	item.name = key
	self.list.append(item)

	def read_to_boundary(self, req, boundary, file):
	previous_delimiter = None
	while not self.eof():
	line = req.readline(readBlockSize)
	self.count += len(line)

	if not line:
	# end of stream
	if file is not None and previous_delimiter is not None:
	file.write(previous_delimiter)
	return True

	match = boundary.match(line)
	if match:
	# the line is the boundary, so we bail out
	# if the two last chars are '--' it is the end of the entity
	return match.group(1) is not None

	if line[-2:] == '\r\n':
	# the line ends with a \r\n, which COULD be part
	# of the next boundary. We write the previous line delimiter
	# then we write the line without \r\n and save it for the next
	# iteration if it was not part of the boundary
	if file is not None:
	if previous_delimiter is not None: file.write(previous_delimiter)
	file.write(line[:-2])
	previous_delimiter = '\r\n'

	elif line[-1:] == '\r':
	# the line ends with \r, which is only possible if
	# readBlockSize bytes have been read. In that case the
	# \r COULD be part of the next boundary, so we save it
	# for the next iteration
	assert len(line) == readBlockSize
	if file is not None:
	if previous_delimiter is not None: file.write(previous_delimiter)
	file.write(line[:-1])
	previous_delimiter = '\r'

	elif line == '\n' and previous_delimiter == '\r':
	# the line us a single \n and we were in the middle of a \r\n,
	# so we complete the delimiter
	previous_delimiter = '\r\n'

	else:
	if file is not None:
	if previous_delimiter is not None: file.write(previous_delimiter)
	file.write(line)
	previous_delimiter = None

	def eof(self):
	return self.clen <= self.count

	def __getitem__(self, key):
	"""Dictionary style indexing."""
	found = self.list.table()[key]
	if len(found) == 1:
	return found[0]
	else:
	return found

	def get(self, key, default):
	try:
	return self.__getitem__(key)
	except (TypeError, KeyError):
	return default

	def keys(self):
	"""Dictionary style keys() method."""
	return self.list.table().keys()

	def __iter__(self):
	return iter(self.keys())

	def __repr__(self):
	return repr(self.list.table())

	def has_key(self, key):
	"""Dictionary style has_key() method."""
	return (key in self.list.table())

	__contains__ = has_key

	def __len__(self):
	"""Dictionary style len(x) support."""
	return len(self.list.table())

	def getfirst(self, key, default=None):
	""" return the first value received """
	try:
	return self.list.table()[key][0]
	except KeyError:
	return default

	def getlist(self, key):
	""" return a list of received values """
	try:
	return self.list.table()[key]
	except KeyError:
	return []

	def items(self):
	"""Dictionary-style items(), except that items are returned in the same
	order as they were supplied in the form."""
	return [(item.name, item) for item in self.list]

	def __delitem__(self, key):
	table = self.list.table()
	values = table[key]
	for value in values:
	self.list.remove(value)

	def clear(self):
	self.list = FieldList()


	def parse_header(line):
	"""Parse a Content-type like header.

	Return the main content-type and a dictionary of options.

	"""

	plist = map(lambda a: a.strip(), line.split(';'))
	key = plist[0].lower()
	del plist[0]
	pdict = {}
	for p in plist:
	i = p.find('=')
	if i >= 0:
	name = p[:i].strip().lower()
	value = p[i+1:].strip()
	if len(value) >= 2 and value[0] == value[-1] == '"':
	value = value[1:-1]
	pdict[name] = value
	return key, pdict

	def apply_fs_data(object, fs, **args):
	"""
	Apply FieldStorage data to an object - the object must be
	callable. Examine the args, and match then with fs data,
	then call the object, return the result.
	"""

	# we need to weed out unexpected keyword arguments
	# and for that we need to get a list of them. There
	# are a few options for callable objects here:

	fc = None
	expected = []
	if hasattr(object, "func_code"):
	# function
	fc = object.func_code
	expected = fc.co_varnames[0:fc.co_argcount]
	elif hasattr(object, 'im_func'):
	# method
	fc = object.im_func.func_code
	expected = fc.co_varnames[1:fc.co_argcount]
	elif type(object) in (TypeType,ClassType):
	# class
	fc = object.__init__.im_func.func_code
	expected = fc.co_varnames[1:fc.co_argcount]
	elif type(object) is BuiltinFunctionType:
	# builtin
	fc = None
	expected = []
	elif hasattr(object, '__call__'):
	# callable object
	if type(object.__call__) is MethodType:
	fc = object.__call__.im_func.func_code
	expected = fc.co_varnames[1:fc.co_argcount]
	else:
	# abuse of objects to create hierarchy
	return apply_fs_data(object.__call__, fs, **args)

	# add form data to args
	for field in fs.list:
	if field.filename:
	val = field
	else:
	val = field.value
	args.setdefault(field.name, []).append(val)

	# replace lists with single values
	for arg in args:
	if ((type(args[arg]) is ListType) and
	(len(args[arg]) == 1)):
	args[arg] = args[arg][0]

	# remove unexpected args unless co_flags & 0x08,
	# meaning function accepts **kw syntax
	if fc is None:
	args = {}
	elif not (fc.co_flags & 0x08):
	for name in args.keys():
	if name not in expected:
	del args[name]

	return object(**args)

	RE_CDISPOSITION_FILENAME = re.compile(r'filename=(?P<filename>[\w\.]*)')
	def handle_file_post(req, allowed_mimetypes=None):
	"""
	Handle the POST of a file.
	@return: the a tuple with th full path to the file saved on disk,
	and it's mimetype as provided by the request.
	@rtype: (string, string)
	"""
	from invenio.bibdocfile import decompose_file, md5
	## We retrieve the length
	clen = req.headers_in["Content-Length"]
	if clen is None:
	raise InvenioWebInterfaceWSGIContentLenghtError("Content-Length header is missing")
	try:
	clen = int(clen)
	assert (clen > 1)
	except (ValueError, AssertionError):
	raise InvenioWebInterfaceWSGIContentLenghtError("Content-Length header should contain a positive integer")
	## Let's take the content type
	ctype = req.headers_in["Content-Type"]
	if allowed_mimetypes and ctype not in allowed_mimetypes:
	raise InvenioWebInterfaceWSGIContentTypeError("Content-Type not in allowed list of content types: %s" % allowed_mimetypes)
	## Let's optionally accept a suggested filename
	suffix = prefix = ''
	g = RE_CDISPOSITION_FILENAME.search(req.headers_in.get("Content-Disposition", ""))
	if g:
	dummy, prefix, suffix = decompose_file(g.group("filename"))
	## Let's optionally accept an MD5 hash (and use it later for comparison)
	cmd5 = req.headers_in["Content-MD5"]
	if cmd5:
	the_md5 = md5()

	## Ok. We can initialize the file
	fd, path = tempfile.mkstemp(suffix=suffix, prefix=prefix, dir=CFG_TMPDIR)
	the_file = os.fdopen(fd, 'w')
	## Let's read the file
	while True:
	chunk = req.read(max(10240, clen))
	if len(chunk) < clen:
	## We expected to read at least clen (which is different than 0)
	## but chunk was shorter! Gosh! Error! Panic!
	the_file.close()
	os.close(fd)
	os.remove(path)
	raise InvenioWebInterfaceWSGIContentLenghtError("File shorter than what specified in Content-Length")
	if cmd5:
	## MD5 was in the header let's compute it
	the_md5.update(chunk)
	## And let's definitively write the content to disk :-)
	the_file.write(chunk)
	clen -= len(chunk)
	if clen == 0:
	## That's it. Everything was read.
	break
	if cmd5 and the_md5.hexdigest().lower() != cmd5.strip().lower():
	## Let's check the MD5
	the_file.close()
	os.close(fd)
	os.remove(path)
	raise InvenioWebInterfaceWSGIContentMD5Error("MD5 checksum does not match")
	## Let's clean everything up
	the_file.close()
	return (path, ctype)

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