62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
# defusedxml
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#
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# Copyright (c) 2013 by Christian Heimes <christian@python.org>
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# Licensed to PSF under a Contributor Agreement.
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# See https://www.python.org/psf/license for licensing details.
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"""Defused xml.sax.expatreader
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"""
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from __future__ import print_function, absolute_import
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from xml.sax.expatreader import ExpatParser as _ExpatParser
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from .common import DTDForbidden, EntitiesForbidden, ExternalReferenceForbidden
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__origin__ = "xml.sax.expatreader"
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class DefusedExpatParser(_ExpatParser):
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"""Defused SAX driver for the pyexpat C module."""
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def __init__(
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self,
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namespaceHandling=0,
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bufsize=2 ** 16 - 20,
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forbid_dtd=False,
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forbid_entities=True,
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forbid_external=True,
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):
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super().__init__(namespaceHandling, bufsize)
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self.forbid_dtd = forbid_dtd
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self.forbid_entities = forbid_entities
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self.forbid_external = forbid_external
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def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
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raise DTDForbidden(name, sysid, pubid)
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def defused_entity_decl(
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self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
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):
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raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
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def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
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# expat 1.2
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raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name) # pragma: no cover
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def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
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raise ExternalReferenceForbidden(context, base, sysid, pubid)
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def reset(self):
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super().reset()
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parser = self._parser
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if self.forbid_dtd:
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parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
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if self.forbid_entities:
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parser.EntityDeclHandler = self.defused_entity_decl
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parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
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if self.forbid_external:
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parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
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def create_parser(*args, **kwargs):
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return DefusedExpatParser(*args, **kwargs)
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