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# 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.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)  # pragma: no cover

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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