/usr/share/pyshared/defusedxml/common.py is in python-defusedxml 0.4.1-1.
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) 2013 by Christian Heimes <christian@python.org>
# Licensed to PSF under a Contributor Agreement.
# See http://www.python.org/psf/license for licensing details.
"""Common constants, exceptions and helpe functions
"""
import sys
from types import MethodType
PY3 = sys.version_info[0] == 3
PY26 = sys.version_info[:2] == (2, 6)
PY31 = sys.version_info[:2] == (3, 1)
class DefusedXmlException(ValueError):
"""Base exception
"""
def __repr__(self):
return str(self)
class DTDForbidden(DefusedXmlException):
"""Document type definition is forbidden
"""
def __init__(self, name, sysid, pubid):
super(DTDForbidden, self).__init__()
self.name = name
self.sysid = sysid
self.pubid = pubid
def __str__(self):
tpl = "DTDForbidden(name='{}', system_id={!r}, public_id={!r})"
return tpl.format(self.name, self.sysid, self.pubid)
class EntitiesForbidden(DefusedXmlException):
"""Entity definition is forbidden
"""
def __init__(self, name, value, base, sysid, pubid, notation_name):
super(EntitiesForbidden, self).__init__()
self.name = name
self.value = value
self.base = base
self.sysid = sysid
self.pubid = pubid
self.notation_name = notation_name
def __str__(self):
tpl = "EntitiesForbidden(name='{}', system_id={!r}, public_id={!r})"
return tpl.format(self.name, self.sysid, self.pubid)
class ExternalReferenceForbidden(DefusedXmlException):
"""Resolving an external reference is forbidden
"""
def __init__(self, context, base, sysid, pubid):
super(ExternalReferenceForbidden, self).__init__()
self.context = context
self.base = base
self.sysid = sysid
self.pubid = pubid
def __str__(self):
tpl = "ExternalReferenceForbidden(system_id='{}', public_id={})"
return tpl.format(self.sysid, self.pubid)
class NotSupportedError(DefusedXmlException):
"""The operation is not supported
"""
def _apply_defusing(defused_mod):
assert defused_mod is sys.modules[defused_mod.__name__]
stdlib_name = defused_mod.__origin__
__import__(stdlib_name, {}, {}, ["*"])
stdlib_mod = sys.modules[stdlib_name]
stdlib_names = set(dir(stdlib_mod))
for name, obj in vars(defused_mod).items():
if name.startswith("_") or name not in stdlib_names:
continue
setattr(stdlib_mod, name, obj)
return stdlib_mod
def _generate_etree_functions(DefusedXMLParser, _TreeBuilder,
_IterParseIterator, _parse, _iterparse):
"""Factory for functions needed by etree, dependent on whether
cElementTree or ElementTree is used."""
def parse(source, parser=None, forbid_dtd=False, forbid_entities=True,
forbid_external=True):
if parser is None:
parser = DefusedXMLParser(target=_TreeBuilder(),
forbid_dtd=forbid_dtd,
forbid_entities=forbid_entities,
forbid_external=forbid_external)
return _parse(source, parser)
if PY26 or PY31:
def bind(xmlparser, funcname, hookname):
func = getattr(DefusedXMLParser, funcname)
if PY26:
# unbound -> function
func = func.__func__
method = MethodType(func, xmlparser, xmlparser.__class__)
else:
method = MethodType(func, xmlparser)
# set hook
setattr(xmlparser._parser, hookname, method)
def iterparse(source, events=None, forbid_dtd=False,
forbid_entities=True, forbid_external=True):
it = _iterparse(source, events)
xmlparser = it._parser
if forbid_dtd:
bind(xmlparser, "defused_start_doctype_decl",
"StartDoctypeDeclHandler")
if forbid_entities:
bind(xmlparser, "defused_entity_decl",
"EntityDeclHandler")
bind(xmlparser, "defused_unparsed_entity_decl",
"UnparsedEntityDeclHandler")
if forbid_external:
bind(xmlparser, "defused_external_entity_ref_handler",
"ExternalEntityRefHandler")
return it
elif PY3:
def iterparse(source, events=None, parser=None, forbid_dtd=False,
forbid_entities=True, forbid_external=True):
close_source = False
if not hasattr(source, "read"):
source = open(source, "rb")
close_source = True
if not parser:
parser = DefusedXMLParser(target=_TreeBuilder(),
forbid_dtd=forbid_dtd,
forbid_entities=forbid_entities,
forbid_external=forbid_external)
return _IterParseIterator(source, events, parser, close_source)
else:
# Python 2.7
def iterparse(source, events=None, parser=None, forbid_dtd=False,
forbid_entities=True, forbid_external=True):
if parser is None:
parser = DefusedXMLParser(target=_TreeBuilder(),
forbid_dtd=forbid_dtd,
forbid_entities=forbid_entities,
forbid_external=forbid_external)
return _iterparse(source, events, parser)
def fromstring(text, forbid_dtd=False, forbid_entities=True,
forbid_external=True):
parser = DefusedXMLParser(target=_TreeBuilder(),
forbid_dtd=forbid_dtd,
forbid_entities=forbid_entities,
forbid_external=forbid_external)
parser.feed(text)
return parser.close()
return parse, iterparse, fromstring
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