Restructure & refactor codebase

internal/glance/embed.go

@@ -0,0 +1,55 @@
+package glance
+
+import (
+	"crypto/md5"
+	"embed"
+	"encoding/hex"
+	"io"
+	"io/fs"
+	"log"
+	"strconv"
+	"time"
+)
+
+//go:embed static
+var _staticFS embed.FS
+
+//go:embed templates
+var _templateFS embed.FS
+
+var staticFS, _ = fs.Sub(_staticFS, "static")
+var templateFS, _ = fs.Sub(_templateFS, "templates")
+
+var staticFSHash = computeFSHash(staticFS)
+
+func computeFSHash(files fs.FS) string {
+	hash := md5.New()
+
+	err := fs.WalkDir(files, ".", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if d.IsDir() {
+			return nil
+		}
+
+		file, err := files.Open(path)
+		if err != nil {
+			return err
+		}
+
+		if _, err := io.Copy(hash, file); err != nil {
+			return err
+		}
+
+		return nil
+	})
+
+	if err == nil {
+		return hex.EncodeToString(hash.Sum(nil))[:10]
+	}
+
+	log.Printf("Could not compute assets cache: %v", err)
+	return strconv.FormatInt(time.Now().Unix(), 10)
+}