You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sbom.go
    path of file: ./repos/trivy/pkg/fanal/artifact/sbom
    
    the code of the file until where you have to start completion: package sbom

import (
	"context"
	"crypto/sha256"
	"encoding/json"
	"os"
	"path/filepath"

	"github.com/opencontainers/go-digest"
	"golang.org/x/xerrors"

	"github.com/aquasecurity/trivy/pkg/fanal/analyzer"
	"github.com/aquasecurity/trivy/pkg/fanal/artifact"
	"github.com/aquasecurity/trivy/pkg/fanal/cache"
	"github.com/aquasecurity/trivy/pkg/fanal/handler"
	"github.com/aquasecurity/trivy/pkg/fanal/types"
	"github.com/aquasecurity/trivy/pkg/log"
	"github.com/aquasecurity/trivy/pkg/sbom"
)

type Artifact 
    
func (a Artifact) Inspect(_ context.Context) (types.ArtifactReference, error) {
	f, err := os.Open(a.filePath)
	if err != nil {
		return types.ArtifactReference{}, xerrors.Errorf("failed to open sbom file error: %w", err)
	}
	defer f.Close()

	// Format auto-detection
	format, err := sbom.DetectFormat(f)
	if err != nil {
		return types.ArtifactReference{}, xerrors.Errorf("failed to detect SBOM format: %w", err)
	}
	log.Logger.Infof("Detected SBOM format: %s", format)

	bom, err := sbom.Decode(f, format)
	if err != nil {
		return types.ArtifactReference{}, xerrors.Errorf("SBOM decode error: %w", err)
	}

	blobInfo := types.BlobInfo{
		SchemaVersion: types.BlobJSONSchemaVersion,
		OS:            bom.OS,
		PackageInfos:  bom.Packages,
		Applications:  bom.Applications,
	}

	cacheKey, err := a.calcCacheKey(blobInfo)
	if err != nil {
		return types.ArtifactReference{}, xerrors.Errorf("failed to calculate a cache key: %w", err)
	}

	if err = a.cache.PutBlob(cacheKey, blobInfo); err != nil {
		return types.ArtifactReference{}, xerrors.Errorf("failed to store blob (%s) in cache: %w", cacheKey, err)
	}

	var artifactType types.ArtifactType
	switch format {
	case sbom.FormatCycloneDXJSON, sbom.FormatCycloneDXXML, sbom.FormatAttestCycloneDXJSON, sbom.FormatLegacyCosignAttestCycloneDXJSON:
		artifactType = types.ArtifactCycloneDX
	case sbom.FormatSPDXTV, sbom.FormatSPDXJSON:
		artifactType = types.ArtifactSPDX

	}

	return types.ArtifactReference{
		Name:    a.filePath,
		Type:    artifactType,
		ID:      cacheKey, // use a cache key as pseudo artifact ID
		BlobIDs: []string{cacheKey},

		// Keep an original report
		CycloneDX: bom.CycloneDX,
	}, nil
}