github.com/munnerz/test-infra@v0.0.0-20190108210205-ce3d181dc989/gubernator/third_party/defusedxml/expatreader.py (about)

     1  # defusedxml
     2  #
     3  # Copyright (c) 2013 by Christian Heimes <christian@python.org>
     4  # Licensed to PSF under a Contributor Agreement.
     5  # See http://www.python.org/psf/license for licensing details.
     6  """Defused xml.sax.expatreader
     7  """
     8  from __future__ import print_function, absolute_import
     9  
    10  from xml.sax.expatreader import ExpatParser as _ExpatParser
    11  
    12  from .common import (DTDForbidden, EntitiesForbidden,
    13                       ExternalReferenceForbidden)
    14  
    15  __origin__ = "xml.sax.expatreader"
    16  
    17  
    18  class DefusedExpatParser(_ExpatParser):
    19      """Defused SAX driver for the pyexpat C module."""
    20  
    21      def __init__(self, namespaceHandling=0, bufsize=2 ** 16 - 20,
    22                   forbid_dtd=False, forbid_entities=True,
    23                   forbid_external=True):
    24          _ExpatParser.__init__(self, namespaceHandling, bufsize)
    25          self.forbid_dtd = forbid_dtd
    26          self.forbid_entities = forbid_entities
    27          self.forbid_external = forbid_external
    28  
    29      def defused_start_doctype_decl(self, name, sysid, pubid,
    30                                     has_internal_subset):
    31          raise DTDForbidden(name, sysid, pubid)
    32  
    33      def defused_entity_decl(self, name, is_parameter_entity, value, base,
    34                              sysid, pubid, notation_name):
    35          raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
    36  
    37      def defused_unparsed_entity_decl(self, name, base, sysid, pubid,
    38                                       notation_name):
    39          # expat 1.2
    40          raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name)
    41  
    42      def defused_external_entity_ref_handler(self, context, base, sysid,
    43                                              pubid):
    44          raise ExternalReferenceForbidden(context, base, sysid, pubid)
    45  
    46      def reset(self):
    47          _ExpatParser.reset(self)
    48          parser = self._parser
    49          if self.forbid_dtd:
    50              parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
    51          if self.forbid_entities:
    52              parser.EntityDeclHandler = self.defused_entity_decl
    53              parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
    54          if self.forbid_external:
    55              parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
    56  
    57  
    58  def create_parser(*args, **kwargs):
    59      return DefusedExpatParser(*args, **kwargs)