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# defusedxml
#
# 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.
"""Defused xml.sax.expatreader
"""
from __future__ import print_function, absolute_import
from xml.sax.expatreader import ExpatParser as _ExpatParser
from .common import (DTDForbidden, EntitiesForbidden,
ExternalReferenceForbidden)
__origin__ = "xml.sax.expatreader"
class DefusedExpatParser(_ExpatParser):
"""Defused SAX driver for the pyexpat C module."""
def __init__(self, namespaceHandling=0, bufsize=2 ** 16 - 20,
forbid_dtd=False, forbid_entities=True,
forbid_external=True):
_ExpatParser.__init__(self, namespaceHandling, bufsize)
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)
def defused_external_entity_ref_handler(self, context, base, sysid,
pubid):
raise ExternalReferenceForbidden(context, base, sysid, pubid)
def reset(self):
_ExpatParser.reset(self)
parser = self._parser
if self.forbid_dtd:
parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
if self.forbid_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
def create_parser(*args, **kwargs):
return DefusedExpatParser(*args, **kwargs)
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