refactor(server): use boxstore helpers and file status consts

- Move box ID validation, file listing/pathing, manifest creation, and uploads to `boxstore`
- Use shared helpers for safe filenames and polling interval env parsing
- Add file status constants to `models` to avoid duplicated magic strings across handlersrefactor(server): use boxstore helpers and file status consts

- Move box ID validation, file listing/pathing, manifest creation, and uploads to `boxstore`
- Use shared helpers for safe filenames and polling interval env parsing
- Add file status constants to `models` to avoid duplicated magic strings across handlers

lib/helpers/ids.go

@@ -0,0 +1,30 @@
+package helpers
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"strings"
+)
+
+func RandomHexID(byteCount int) (string, error) {
+	bytes := make([]byte, byteCount)
+	if _, err := rand.Read(bytes); err != nil {
+		return "", err
+	}
+
+	return hex.EncodeToString(bytes), nil
+}
+
+func ValidLowerHexID(value string, length int) bool {
+	if len(value) != length {
+		return false
+	}
+
+	for _, character := range value {
+		if !strings.ContainsRune("0123456789abcdef", character) {
+			return false
+		}
+	}
+
+	return true
+}