Add support for ipv6 ip address in user injection

[derek-ho]

Description

Enhances the parsing logic of user injection to support ipv6 addresses.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation) Bug fix

• Why these changes are required? Issue: https://github.com/opensearch-project/security/issues/4177

• What is the old behavior before changes and new behavior after changes? Ipv6 IP addresses would throw a parsing error, now it doesn't

Issues Resolved

Fix: https://github.com/opensearch-project/security/issues/4177

Is this a backport? If so, please add backport PR # and/or commits # No

Testing

Added unit test

Check List

• [x] New functionality includes testing
• [ ] New functionality has been documented
• [x] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.41%. Comparing base (f002182) to head (a680e92).

Additional details and impacted files

[](https://app.codecov.io/gh/opensearch-project/security/pull/4399?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) ```diff @@ Coverage Diff @@ ## main #4399 +/- ## ========================================== + Coverage 65.39% 65.41% +0.01% ========================================== Files 310 310 Lines 21993 21995 +2 Branches 3554 3554 ========================================== + Hits 14383 14388 +5 + Misses 5838 5835 -3 Partials 1772 1772 ``` | [Files](https://app.codecov.io/gh/opensearch-project/security/pull/4399?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | Coverage Δ | | |---|---|---| | [...ava/org/opensearch/security/auth/UserInjector.java](https://app.codecov.io/gh/opensearch-project/security/pull/4399?src=pr&el=tree&filepath=src%2Fmain%2Fjava%2Forg%2Fopensearch%2Fsecurity%2Fauth%2FUserInjector.java&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project#diff-c3JjL21haW4vamF2YS9vcmcvb3BlbnNlYXJjaC9zZWN1cml0eS9hdXRoL1VzZXJJbmplY3Rvci5qYXZh) | `89.53% <100.00%> (+0.24%)` | :arrow_up: | ... and [4 files with indirect coverage changes](https://app.codecov.io/gh/opensearch-project/security/pull/4399/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project)

[cwperks]

DCO check is stuck. I am bypassing and manually verified that all commits are signed.