migrate json schema generation (#4270)

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

internal/sourcemetadata/names.go

@@ -0,0 +1,42 @@
+package sourcemetadata
+
+import (
+	"reflect"
+	"strings"
+
+	"github.com/anchore/syft/syft/source"
+)
+
+var jsonNameFromType = map[reflect.Type][]string{
+	reflect.TypeOf(source.DirectoryMetadata{}): {"directory", "dir"},
+	reflect.TypeOf(source.FileMetadata{}):      {"file"},
+	reflect.TypeOf(source.ImageMetadata{}):     {"image"},
+	reflect.TypeOf(source.SnapMetadata{}):      {"snap"},
+}
+
+func AllTypeNames() []string {
+	names := make([]string, 0)
+	for _, t := range AllTypes() {
+		names = append(names, reflect.TypeOf(t).Name())
+	}
+	return names
+}
+
+func JSONName(metadata any) string {
+	if vs, exists := jsonNameFromType[reflect.TypeOf(metadata)]; exists {
+		return vs[0]
+	}
+	return ""
+}
+
+func ReflectTypeFromJSONName(name string) reflect.Type {
+	name = strings.ToLower(name)
+	for t, vs := range jsonNameFromType {
+		for _, v := range vs {
+			if strings.ToLower(v) == name {
+				return t
+			}
+		}
+	}
+	return nil
+}