libs: add module xml_utils
#9
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"lxml is a Pythonic, mature binding for the libxml2 and libxslt libraries. It provides safe and convenient access to these libraries using the ElementTree API." https://lxml.de/ https://github.com/lxml/lxml
"XML bomb protection for Python stdlib modules". https://github.com/tiran/defusedxml
Add helper functions (plus some related exception classes). - `parse_untrusted_xml`: handles the numerous issues and concerns related to parsing untrusted XML data. - `read_xml_schema`: instantiate an XML schema object from a file. - `validate_xml_doc`: validate an XML document against an XML schema. Sources of files in 'test_data/xml/attacks': - https://en.wikipedia.org/wiki/Billion_laughs_attack#Code_example - https://pypi.org/project/defusedxml/#billion-laughs-exponential-entity-expansion - https://pypi.org/project/defusedxml/#external-entity-expansion-remote - https://pypi.org/project/defusedxml/#quadratic-blowup-entity-expansion Some tests have not been implemented.
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Add helper functions (plus some related exception classes).
parse_untrusted_xml: handles the numerous issues and concerns related to parsing untrusted XML data.read_xml_schema: instantiate an XML schema object from a file.validate_xml_doc: validate an XML document against an XML schema.Some tests have not been implemented.