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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)