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# vim: set sw=4 expandtab :
#
# 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: util.py 478129 2006-11-22 11:15:54Z grahamd $
import _apache
import apache
import cStringIO
import tempfile
import re
from types import *
from exceptions import *
parse_qs = _apache.parse_qs
parse_qsl = _apache.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()
# 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 apache.SERVER_RETURN, apache.HTTP_LENGTH_REQUIRED
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
raise apache.SERVER_RETURN, apache.HTTP_NOT_IMPLEMENTED
# 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 apache.SERVER_RETURN, apache.HTTP_BAD_REQUEST
# read until boundary
self.read_to_boundary(req, boundary, None)
end_of_stream = False
while not end_of_stream: # jjj JIM BEGIN WHILE
## parse headers
ctype, type_options = "text/plain", {}
disp, disp_options = None, {}
headers = apache.make_table()
line = req.readline(readBlockSize)
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)
while nextline and nextline[0] in [ ' ', '\t']:
line = line + nextline
nextline = req.readline(readBlockSize)
# 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)
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 True:
line = req.readline(readBlockSize)
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 __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)
def redirect(req, location, permanent=0, text=None):
"""
A convenience function to provide redirection
"""
if req.sent_bodyct:
raise IOError, "Cannot redirect after headers have already been sent."
req.err_headers_out["Location"] = location
if permanent:
req.status = apache.HTTP_MOVED_PERMANENTLY
else:
req.status = apache.HTTP_MOVED_TEMPORARILY
if text is None:
req.write('<p>The document has moved'
' <a href="%s">here</a></p>\n'
% location)
else:
req.write(text)
raise apache.SERVER_RETURN, apache.DONE
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