add python author and emil fields + add metadata type

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

syft/pkg/rpmdb_metadata.go

@@ -0,0 +1,37 @@
+package pkg
+
+import (
+	"fmt"
+
+	"github.com/anchore/syft/syft/distro"
+	"github.com/package-url/packageurl-go"
+)
+
+// RpmdbMetadata represents all captured data for a RPM DB package entry.
+type RpmdbMetadata struct {
+	Name      string `json:"name"`
+	Version   string `json:"version"`
+	Epoch     int    `json:"epoch"`
+	Arch      string `json:"architecture"`
+	Release   string `json:"release"`
+	SourceRpm string `json:"sourceRpm"`
+	Size      int    `json:"size"`
+	License   string `json:"license"`
+	Vendor    string `json:"vendor"`
+}
+
+func (m RpmdbMetadata) PackageURL(d distro.Distro) string {
+	pURL := packageurl.NewPackageURL(
+		packageurl.TypeRPM,
+		d.Type.String(),
+		m.Name,
+		fmt.Sprintf("%d:%s-%s", m.Epoch, m.Version, m.Release),
+		packageurl.Qualifiers{
+			{
+				Key:   "arch",
+				Value: m.Arch,
+			},
+		},
+		"")
+	return pURL.ToString()
+}