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",
+}

app/utils/responseErrors/responseErrors.go

@@ -42,6 +42,7 @@ var (
 	// Typed errors for product description handler
 	ErrBadAttribute   = errors.New("bad or missing attribute value in header")
 	ErrBadField       = errors.New("this field can not be updated")
+	ErrInvalidURLSlug = errors.New("URL slug does not obey the industry standard")
 	ErrInvalidXHTML   = errors.New("text is not in xhtml format")
 	ErrAIResponseFail = errors.New("AI responded with failure")
 	ErrAIBadOutput    = errors.New("AI response does not obey the format")
@@ -136,6 +137,8 @@ func GetErrorCode(c fiber.Ctx, err error) string {
 		return i18n.T_(c, "error.err_bad_attribute")
 	case errors.Is(err, ErrBadField):
 		return i18n.T_(c, "error.err_bad_field")
+	case errors.Is(err, ErrInvalidURLSlug):
+		return i18n.T_(c, "error.invalid_url_slug")
 	case errors.Is(err, ErrInvalidXHTML):
 		return i18n.T_(c, "error.err_invalid_html")
 	case errors.Is(err, ErrAIResponseFail):
@@ -195,6 +198,7 @@ func GetErrorStatus(err error) int {
 		errors.Is(err, ErrInvalidPassword),
 		errors.Is(err, ErrBadAttribute),
 		errors.Is(err, ErrBadField),
+		errors.Is(err, ErrInvalidURLSlug),
 		errors.Is(err, ErrInvalidXHTML),
 		errors.Is(err, ErrBadPaging),
 		errors.Is(err, ErrNoRootFound),