feat(remediation): validate upgrade suggestions against transitive dependency graph (#708)

[dinesh9997]

Resolves #708

Problem Statement

Remediation suggestions (such as version upgrades) generated by scanners could conflict with other existing project dependencies, resulting in dependency conflicts and broken builds when applied.

Solution Overview

Integrated a transitive dependency graph resolver that parses project manifests and validates recommended library upgrades against package version constraints.

1. Dependency Parsing & Graph Building: Scans local project manifests (Python requirements.txt / requirements-dev.txt and Node.js package.json / package-lock.json).
2. NPM to PEP-440 Version Mapping: Maps NPM/Node semver range specifiers (carets ^, tildes ~, wildcards, partial versions) to PEP-440 specifiers using packaging.specifiers to enable standard Python version compliance checking.
3. Remediation Conflict Checking: Checks proposed upgrade versions against constraints in the dependency graph.
4. Enriched Safety Indicators: Stores a "safe_to_apply" indicator, "compatible_range", and actionable "alternatives" (e.g., upgrading the parent package) inside finding metadata and exposes them as top-level fields in API payloads.

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Key Changes

• backend/secuscan/remediation.py [NEW]: Encapsulates all package normalization, version cleaning, semver-to-pep440 conversion, lockfile/manifest parsing, and validation logic.
• backend/secuscan/models.py: Added optional safe_to_apply, compatible_range, and alternatives fields to the Pydantic Finding schema.
• backend/secuscan/executor.py: Integrated validation logic into the executor's _build_result_contract normalization phase.
• backend/secuscan/routes.py: Enriched findings deserialization helper and /finding/{finding_id} routes to expose safety indicators at the top level of responses.
• testing/backend/unit/test_remediation_safety.py [NEW]: Added 10 unit tests covering range translations, manifest parsing, safe/unsafe validations, and serialization.

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Verification and Testing Done

Automated Tests

• Ran unit tests specifically for remediation validation logic:

  .\venv\Scripts\pytest testing/backend/unit/test_remediation_safety.py -v

[utksh1]

This needs changes before it can merge.

Blocking issues:

1. build_dependency_graph(target) falls back to this SecuScan repository’s backend/frontend manifests whenever the supplied target does not contain requirements/package files. For normal URL/IP scan targets, that means remediation safety is computed against SecuScan’s own dependencies, not the scanned project. That can mark unrelated remediation advice safe/unsafe based on the wrong dependency graph.

2. _build_result_contract wraps the whole remediation validation block in except Exception: pass, so parser bugs, malformed manifests, and version parsing errors disappear silently. At minimum, log the failure with task/plugin context and avoid adding misleading safety metadata when validation did not actually run.

3. The feature adds top-level API fields but only sources them from metadata during deserialization. Please add route/serialization coverage that proves list/detail finding responses expose these fields only when they came from validated remediation metadata.

4. The resolver includes deterministic mock transitive dependencies in production code. Test fixtures should live in tests, not in runtime remediation logic.

[dinesh9997]

Hi @utksh1 ,
I have addressed all the blocking review items for the transitive dependency safety engine:

1. Target Manifest Fallback Fixed: build_dependency_graph(target_dir) now checks for local target directory existence. If the target is a URL, IP address, or invalid path, it immediately returns {} instead of falling back to local SecuScan manifests (preventing validation against the host repository's dependencies).

2.Relocated Test Mock Fixtures: Removed the hardcoded get_mock_dependencies registry from remediation.py. Test fixtures now live entirely in test_remediation_safety.py, where get_python_transitive_dependencies is mocked dynamically.

3.Atomic Safety Enrichment: Validation is now performed atomically inside executor.py (_build_result_contract). If an exception or parser crash occurs, we print warning logs containing task and plugin contexts, and avoid adding any partial or misleading safety metadata to the findings.

4.Integration Route Coverage: Created test_routes_remediation_safety.py to test both /findings (list) and /finding/{finding_id} (detail) responses, ensuring safe_to_apply, compatible_range, and alternatives are exposed correctly only when sourced from validated remediation metadata.

5.Formatting Hygiene: Cleaned up all trailing whitespaces in the test files to pass the formatting checks.

so let me know any changes needed to be done.

[utksh1]

Thanks for the update. This still needs changes before merge.

The PR remains broader than the remediation graph fix and now includes .audit-config.yaml plus scan-cache/main/routes churn. The remediation change is security-sensitive and should be reviewable on its own.

Please remove the unrelated audit/config/cache/API churn and keep this focused on validating upgrade suggestions against the dependency graph with direct unit/integration coverage. Once the patch is narrow, the remaining remediation behavior can be reviewed properly.

[dinesh9997]

Hi @utksh1,

I have cleaned up this branch as requested:

Reverted all unrelated .audit-config.yaml, cache.py, main.py, plugin metadata, and config/manifest changes back to the upstream base.
Removed the test_scan_cache.py test suite from this branch.
Cleaned up the executor.py and routes.py changes to keep only the remediation safety validation loop inside _build_result_contract and the serialization exposure helpers.
This PR is now strictly focused on the Transitive Dependency Safety Engine implementation and its related unit/integration tests.so let me know any changes needed to be done.

[utksh1]

Rechecking after the latest merge from main: this is still blocked.

The frontend-checks job is failing on the current head. This remediation graph change also needs to stay focused on remediation dependency validation, without unrelated audit/config/cache/API churn, before it can be reviewed safely.