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git.stella-ops.org/docs/features/unchecked/scanner/findingevidence-composition-api-endpoint.md

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# FindingEvidence Composition API Endpoint
## Module
Scanner
## Status
IMPLEMENTED
## Description
REST API endpoint that composes per-finding evidence bundles by aggregating SBOM slices, reachability proofs, VEX documents, and attestation chains into a unified evidence response. EvidenceCompositionService orchestrates multi-source evidence assembly on demand.
## Implementation Details
- **Evidence Composition Service**:
- `src/Scanner/StellaOps.Scanner.WebService/Services/IEvidenceCompositionService.cs` - `IEvidenceCompositionService` interface
- `src/Scanner/StellaOps.Scanner.WebService/Services/EvidenceCompositionService.cs` - Orchestrates multi-source evidence assembly (SBOM slices, reachability, VEX, attestations)
- `src/Scanner/StellaOps.Scanner.WebService/Services/EvidenceCompositionService.cs` - `EvidenceCompositionOptions` for configuring evidence sources
- **Evidence Endpoints**:
- `src/Scanner/StellaOps.Scanner.WebService/Endpoints/EvidenceEndpoints.cs` - `EvidenceEndpoints` for listing and querying evidence
- `src/Scanner/StellaOps.Scanner.WebService/Endpoints/ReachabilityEvidenceEndpoints.cs` - Reachability-specific evidence endpoints
- `src/Scanner/StellaOps.Scanner.WebService/Endpoints/DeltaEvidenceEndpoints.cs` - Delta evidence endpoints
- **Evidence Export**:
- `src/Scanner/StellaOps.Scanner.WebService/Services/IEvidenceBundleExporter.cs` - Evidence bundle export interface
- `src/Scanner/StellaOps.Scanner.WebService/Services/EvidenceBundleExporter.cs` - Exports evidence bundles in multiple formats
## E2E Test Plan
- [ ] Call the evidence composition endpoint for a specific finding and verify a unified evidence response is returned
- [ ] Verify the response includes SBOM slice data for the affected component
- [ ] Verify the response includes reachability proof when reachability analysis was performed
- [ ] Verify the response includes VEX document references when VEX data is available
- [ ] Verify the response includes attestation chain verification status
- [ ] Verify evidence bundle export works in supported formats