107 lines
3.6 KiB
Python
107 lines
3.6 KiB
Python
# defusedxml
|
|
#
|
|
# Copyright (c) 2013 by Christian Heimes <christian@python.org>
|
|
# Licensed to PSF under a Contributor Agreement.
|
|
# See https://www.python.org/psf/license for licensing details.
|
|
"""Defused xml.dom.expatbuilder
|
|
"""
|
|
from __future__ import print_function, absolute_import
|
|
|
|
from xml.dom.expatbuilder import ExpatBuilder as _ExpatBuilder
|
|
from xml.dom.expatbuilder import Namespaces as _Namespaces
|
|
|
|
from .common import DTDForbidden, EntitiesForbidden, ExternalReferenceForbidden
|
|
|
|
__origin__ = "xml.dom.expatbuilder"
|
|
|
|
|
|
class DefusedExpatBuilder(_ExpatBuilder):
|
|
"""Defused document builder"""
|
|
|
|
def __init__(
|
|
self, options=None, forbid_dtd=False, forbid_entities=True, forbid_external=True
|
|
):
|
|
_ExpatBuilder.__init__(self, options)
|
|
self.forbid_dtd = forbid_dtd
|
|
self.forbid_entities = forbid_entities
|
|
self.forbid_external = forbid_external
|
|
|
|
def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
|
|
raise DTDForbidden(name, sysid, pubid)
|
|
|
|
def defused_entity_decl(
|
|
self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
|
|
):
|
|
raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
|
|
|
|
def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
|
|
# expat 1.2
|
|
raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name) # pragma: no cover
|
|
|
|
def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
|
|
raise ExternalReferenceForbidden(context, base, sysid, pubid)
|
|
|
|
def install(self, parser):
|
|
_ExpatBuilder.install(self, parser)
|
|
|
|
if self.forbid_dtd:
|
|
parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
|
|
if self.forbid_entities:
|
|
# if self._options.entities:
|
|
parser.EntityDeclHandler = self.defused_entity_decl
|
|
parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
|
|
if self.forbid_external:
|
|
parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
|
|
|
|
|
|
class DefusedExpatBuilderNS(_Namespaces, DefusedExpatBuilder):
|
|
"""Defused document builder that supports namespaces."""
|
|
|
|
def install(self, parser):
|
|
DefusedExpatBuilder.install(self, parser)
|
|
if self._options.namespace_declarations:
|
|
parser.StartNamespaceDeclHandler = self.start_namespace_decl_handler
|
|
|
|
def reset(self):
|
|
DefusedExpatBuilder.reset(self)
|
|
self._initNamespaces()
|
|
|
|
|
|
def parse(file, namespaces=True, forbid_dtd=False, forbid_entities=True, forbid_external=True):
|
|
"""Parse a document, returning the resulting Document node.
|
|
|
|
'file' may be either a file name or an open file object.
|
|
"""
|
|
if namespaces:
|
|
build_builder = DefusedExpatBuilderNS
|
|
else:
|
|
build_builder = DefusedExpatBuilder
|
|
builder = build_builder(
|
|
forbid_dtd=forbid_dtd, forbid_entities=forbid_entities, forbid_external=forbid_external
|
|
)
|
|
|
|
if isinstance(file, str):
|
|
fp = open(file, "rb")
|
|
try:
|
|
result = builder.parseFile(fp)
|
|
finally:
|
|
fp.close()
|
|
else:
|
|
result = builder.parseFile(file)
|
|
return result
|
|
|
|
|
|
def parseString(
|
|
string, namespaces=True, forbid_dtd=False, forbid_entities=True, forbid_external=True
|
|
):
|
|
"""Parse a document from a string, returning the resulting
|
|
Document node.
|
|
"""
|
|
if namespaces:
|
|
build_builder = DefusedExpatBuilderNS
|
|
else:
|
|
build_builder = DefusedExpatBuilder
|
|
builder = build_builder(
|
|
forbid_dtd=forbid_dtd, forbid_entities=forbid_entities, forbid_external=forbid_external
|
|
)
|
|
return builder.parseString(string)
|