feat(iast): xss vulnerability for django applications

[avara1986]

XSS vulnerability detection.

System tests (merge after this PR): DataDog/system-tests#3923

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

ddtrace/appsec/_iast/taint_sinks/xss.py                                 @DataDog/asm-python
releasenotes/notes/iast-feat-xss-django-6781a8b9a4092832.yaml           @DataDog/apm-python
tests/appsec/iast/taint_sinks/test_xss_redacted.py                      @DataDog/asm-python
tests/appsec/integrations/django_tests/django_app/templates/index.html  @DataDog/asm-python
tests/appsec/integrations/django_tests/django_app/templates/index_autoescape.html  @DataDog/asm-python
tests/appsec/integrations/django_tests/django_app/templates/index_safe.html  @DataDog/asm-python
ddtrace/appsec/_iast/_evidence_redaction/_sensitive_handler.py          @DataDog/asm-python
ddtrace/appsec/_iast/_patch_modules.py                                  @DataDog/asm-python
ddtrace/appsec/_iast/constants.py                                       @DataDog/asm-python
docker-compose.yml                                                      @DataDog/apm-core-python
tests/appsec/iast/taint_sinks/_taint_sinks_utils.py                     @DataDog/asm-python
tests/appsec/integrations/django_tests/conftest.py                      @DataDog/asm-python
tests/appsec/integrations/django_tests/django_app/settings.py           @DataDog/asm-python
tests/appsec/integrations/django_tests/django_app/urls.py               @DataDog/asm-python
tests/appsec/integrations/django_tests/django_app/views.py              @DataDog/asm-python
tests/appsec/integrations/django_tests/test_django_appsec_iast.py       @DataDog/asm-python
tests/appsec/integrations/pygoat_tests/test_pygoat.py                   @DataDog/asm-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-04 09:36:01

Comparing candidate commit 04c1515 in PR branch avara1986/APPSEC-10657-xss_django with baseline commit 63d13ab in branch 3.x-staging.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 394 metrics, 2 unstable metrics.

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: avara1986/APPSEC-10657-xss_django
Commit report: 04c1515
Test service: dd-trace-py

✅ 0 Failed, 130 Passed, 1184 Skipped, 3m 22.54s Total duration (24m 48.72s time saved)