Update JXPathFuzzer.java Refactor JXPath Fuzzer for Improved Fuzzing Coverage, Security, and Error Handling

[Shivam7-1]

PR Description:

Here in This PR several improvements to the original JXPathFuzzer.java file for better fuzzing coverage, error handling, and security.
Changes:

1. Refactoring of Document Creation Logic:

   • Extracted the XML document creation and parsing logic into a separate method createDocument() for better code organization and readability.
   • The method consumes fuzzed data to configure the DocumentBuilderFactory, including additional configuration for better security.
   • The code now consumes a random length for the XML input (between 100 and 500 characters) instead of always consuming a fixed length of 2000 characters.
   • If the generated XML input is empty, it defaults to a valid but empty XML structure (<root></root>).
   • Added a security feature to disable DTD declarations (setFeature("http://apache.org/xml/features/disallow-doctype-decl", true)) to mitigate potential XXE attacks.

2. Improved XPath Query Handling:

   • The logic for performing the XPath query has been moved to a separate method performXPathQuery().
   • The XPath query now handles cases where the query is too short (less than 5 characters) by replacing it with an invalid XPath query (//invalid_xpath) to simulate malformed queries.
   • Enhanced exception handling by logging XPath-related errors (JXPathException).

3. Improved Error Handling:

   • Detailed error logging has been added to capture issues during document creation, XML parsing, and XPath query execution. This will provide better visibility into failures during fuzzing.

4. Fuzzing Enhancements:

   • The fuzzerTestOneInput method now calls the refactored methods for document creation and XPath query execution.
   • The changes ensure more diverse and randomized input sizes, improving fuzzing coverage and testing for edge cases.

[github-actions]

Shivam7-1 is a new contributor to projects/apache-commons-jxpath. The PR must be approved by known contributors before it can be merged. The past contributors are: henryrneh, bharathmohanraj, fmeum, 0roman

[Shivam7-1]

Hii @henryrneh @bharathmohanraj Could Team Review This PR
Thanks