sanitize and save URL slugs

app/utils/const_data/consts.go

@@ -12,3 +12,28 @@ const MAX_AMOUNT_OF_CARTS_PER_USER = 10
 const DEFAULT_NEW_CART_NAME = "new cart"
 
 const USER_LOCALE = "user"
+
+// Slug sanitization
+const NON_ALNUM_REGEX = `[^a-z0-9]+`
+const MULTI_DASH_REGEX = `-+`
+const SLUG_REGEX = `^[a-z0-9]+(?:-[a-z0-9]+)*$`
+
+// Currently supports only German+Polish specific cases
+var TRANSLITERATION_TABLE = map[rune]string{
+	// German
+	'ä': "ae",
+	'ö': "oe",
+	'ü': "ue",
+	'ß': "ss",
+
+	// Polish
+	'ą': "a",
+	'ć': "c",
+	'ę': "e",
+	'ł': "l",
+	'ń': "n",
+	'ó': "o",
+	'ś': "s",
+	'ż': "z",
+	'ź': "z",
+}