refactor: move formats from internal into syft module (#1172)

syft/formats/common/spdxhelpers/document_namespace.go

@@ -0,0 +1,42 @@
+package spdxhelpers
+
+import (
+	"fmt"
+	"net/url"
+	"path"
+
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/syft/source"
+	"github.com/google/uuid"
+)
+
+func DocumentNameAndNamespace(srcMetadata source.Metadata) (string, string) {
+	name := DocumentName(srcMetadata)
+	return name, DocumentNamespace(name, srcMetadata)
+}
+
+func DocumentNamespace(name string, srcMetadata source.Metadata) string {
+	input := "unknown-source-type"
+	switch srcMetadata.Scheme {
+	case source.ImageScheme:
+		input = "image"
+	case source.DirectoryScheme:
+		input = "dir"
+	case source.FileScheme:
+		input = "file"
+	}
+
+	uniqueID := uuid.Must(uuid.NewRandom())
+	identifier := path.Join(input, uniqueID.String())
+	if name != "." {
+		identifier = path.Join(input, fmt.Sprintf("%s-%s", name, uniqueID.String()))
+	}
+
+	u := url.URL{
+		Scheme: "https",
+		Host:   "anchore.com",
+		Path:   path.Join(internal.ApplicationName, identifier),
+	}
+
+	return u.String()
+}