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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.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)