[WIP] migrate helper functions for spdx

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

internal/formats/common/spdxhelpers/document_name.go

@@ -0,0 +1,32 @@
+package spdxhelpers
+
+import (
+	"path"
+	"strings"
+
+	"github.com/anchore/syft/syft/source"
+	"github.com/google/uuid"
+)
+
+func DocumentName(srcMetadata source.Metadata) string {
+	switch srcMetadata.Scheme {
+	case source.ImageScheme:
+		return cleanSPDXName(srcMetadata.ImageMetadata.UserInput)
+	case source.DirectoryScheme:
+		return cleanSPDXName(srcMetadata.Path)
+	}
+
+	// TODO: is this alright?
+	return uuid.Must(uuid.NewRandom()).String()
+}
+
+func cleanSPDXName(name string) string {
+	// remove # according to specification
+	name = strings.ReplaceAll(name, "#", "-")
+
+	// remove : for url construction
+	name = strings.ReplaceAll(name, ":", "-")
+
+	// clean relative pathing
+	return path.Clean(name)
+}

internal/formats/common/spdxhelpers/document_namespace.go

@@ -0,0 +1,29 @@
+package spdxhelpers
+
+import (
+	"fmt"
+	"path"
+
+	"github.com/anchore/syft/syft/source"
+	"github.com/google/uuid"
+)
+
+const SyftDocumentNamespace = "https://anchore.com/syft"
+
+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"
+	}
+
+	uniqueID := uuid.Must(uuid.NewRandom())
+	identifier := path.Join(input, uniqueID.String())
+	if name != "." {
+		identifier = path.Join(input, fmt.Sprintf("%s-%s", name, uniqueID.String()))
+	}
+
+	return path.Join(SyftDocumentNamespace, identifier)
+}