From fb468c839fb6d583a5b73e318c99c4643b06e815 Mon Sep 17 00:00:00 2001
From: Patrik Beno <patrik.beno@greenhorn.sk>
Date: Sun, 5 Jun 2022 16:31:19 +0200
Subject: [PATCH] SBOM cataloger

Signed-off-by: Patrik Beno <patrik.beno@greenhorn.sk>
---
 syft/pkg/cataloger/cataloger.go      |  4 ++
 syft/pkg/cataloger/sbom/cataloger.go | 70 ++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 syft/pkg/cataloger/sbom/cataloger.go

diff --git a/syft/pkg/cataloger/cataloger.go b/syft/pkg/cataloger/cataloger.go
index 1aded4adf63..d7755bd9551 100644
--- a/syft/pkg/cataloger/cataloger.go
+++ b/syft/pkg/cataloger/cataloger.go
@@ -24,6 +24,7 @@ import (
 	"github.com/anchore/syft/syft/pkg/cataloger/rpmdb"
 	"github.com/anchore/syft/syft/pkg/cataloger/ruby"
 	"github.com/anchore/syft/syft/pkg/cataloger/rust"
+	"github.com/anchore/syft/syft/pkg/cataloger/sbom"
 	"github.com/anchore/syft/syft/source"
 )
 
@@ -51,6 +52,7 @@ func ImageCatalogers(cfg Config) []Cataloger {
 		apkdb.NewApkdbCataloger(),
 		golang.NewGoModuleBinaryCataloger(),
 		dotnet.NewDotnetDepsCataloger(),
+		sbom.NewSBOMCataloger(),
 	}, cfg.Catalogers)
 }
 
@@ -72,6 +74,7 @@ func DirectoryCatalogers(cfg Config) []Cataloger {
 		rust.NewCargoLockCataloger(),
 		dart.NewPubspecLockCataloger(),
 		dotnet.NewDotnetDepsCataloger(),
+		sbom.NewSBOMCataloger(),
 	}, cfg.Catalogers)
 }
 
@@ -94,6 +97,7 @@ func AllCatalogers(cfg Config) []Cataloger {
 		rust.NewCargoLockCataloger(),
 		dart.NewPubspecLockCataloger(),
 		dotnet.NewDotnetDepsCataloger(),
+		sbom.NewSBOMCataloger(),
 	}, cfg.Catalogers)
 }
 
diff --git a/syft/pkg/cataloger/sbom/cataloger.go b/syft/pkg/cataloger/sbom/cataloger.go
new file mode 100644
index 00000000000..e55341e4da9
--- /dev/null
+++ b/syft/pkg/cataloger/sbom/cataloger.go
@@ -0,0 +1,70 @@
+package sbom
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/anchore/syft/internal/formats/cyclonedxjson"
+	"github.com/anchore/syft/internal/formats/cyclonedxxml"
+	"github.com/anchore/syft/internal/formats/spdx22json"
+	"github.com/anchore/syft/internal/formats/spdx22tagvalue"
+	"github.com/anchore/syft/internal/formats/syftjson"
+	"github.com/anchore/syft/syft/artifact"
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/pkg/cataloger/common"
+	"github.com/anchore/syft/syft/sbom"
+	"io"
+)
+
+// NewSBOMCataloger returns a new SBOM cataloger object loaded from saved SBOM JSON.
+func NewSBOMCataloger() *common.GenericCataloger {
+	globParsers := map[string]common.ParserFn{
+		"**/*.syft.json": parseSyftJson,
+		"**/bom.json":    parseCyclonedxJson,
+		"**/bom.xml":     parseCyclonedxXml,
+		"**/*.cdx.json":  parseCyclonedxJson,
+		"**/*.cdx.xml":   parseCyclonedxXml,
+		"**/*.spdx.json": parseSpdxJson,
+		"**/*.spdx":      parseSpdx,
+	}
+	return common.NewGenericCataloger(nil, globParsers, "sbom-cataloger")
+}
+
+func parseSyftJson(path string, reader io.Reader) ([]*pkg.Package, []artifact.Relationship, error) {
+	return parseSBOM(path, reader, syftjson.Format())
+}
+
+func parseCyclonedxJson(path string, reader io.Reader) ([]*pkg.Package, []artifact.Relationship, error) {
+	return parseSBOM(path, reader, cyclonedxjson.Format())
+}
+
+func parseCyclonedxXml(path string, reader io.Reader) ([]*pkg.Package, []artifact.Relationship, error) {
+	return parseSBOM(path, reader, cyclonedxxml.Format())
+}
+
+func parseSpdxJson(path string, reader io.Reader) ([]*pkg.Package, []artifact.Relationship, error) {
+	return parseSBOM(path, reader, spdx22json.Format())
+}
+
+func parseSpdx(path string, reader io.Reader) ([]*pkg.Package, []artifact.Relationship, error) {
+	return parseSBOM(path, reader, spdx22tagvalue.Format())
+}
+
+func parseSBOM(_ string, reader io.Reader, format sbom.Format) ([]*pkg.Package, []artifact.Relationship, error) {
+	by, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, nil, fmt.Errorf("unable to read sbom: %w", err)
+	}
+
+	s, err := format.Decode(bytes.NewReader(by))
+	if err != nil {
+		return nil, nil, fmt.Errorf("unable to decode sbom: %w", err)
+	}
+
+	var packages []*pkg.Package
+	for _, p := range s.Artifacts.PackageCatalog.Sorted() {
+		x := p //copy
+		packages = append(packages, &x)
+	}
+
+	return packages, nil, nil
+}