sanitize and save URL slugs

app/service/productTranslationService/sanitizeURLSlug.go

@@ -0,0 +1,69 @@
+package productTranslationService
+
+import (
+	"strings"
+	"unicode"
+
+	constdata "git.ma-al.com/goc_daniel/b2b/app/utils/const_data"
+	"github.com/dlclark/regexp2"
+	"golang.org/x/text/runes"
+	"golang.org/x/text/transform"
+	"golang.org/x/text/unicode/norm"
+)
+
+func IsValidSlug(s string) bool {
+	var slug_regex2 = regexp2.MustCompile(constdata.SLUG_REGEX, regexp2.None)
+
+	ok, _ := slug_regex2.MatchString(s)
+	return ok
+}
+
+func SanitizeSlug(s string) string {
+	s = strings.TrimSpace(strings.ToLower(s))
+
+	// First apply explicit transliteration for language-specific letters.
+	s = transliterateWithTable(s)
+
+	// Then normalize and strip any remaining combining marks.
+	s = removeDiacritics(s)
+
+	// Replace all non-alphanumeric runs with "-"
+	var non_alphanum_regex2 = regexp2.MustCompile(constdata.NON_ALNUM_REGEX, regexp2.None)
+	s, _ = non_alphanum_regex2.Replace(s, "-", -1, -1)
+
+	// Collapse repeated "-" and trim edges
+	var multi_dash_regex2 = regexp2.MustCompile(constdata.MULTI_DASH_REGEX, regexp2.None)
+	s, _ = multi_dash_regex2.Replace(s, "-", -1, -1)
+
+	s = strings.Trim(s, "-")
+
+	return s
+}
+
+func transliterateWithTable(s string) string {
+	var b strings.Builder
+	b.Grow(len(s))
+
+	for _, r := range s {
+		if repl, ok := constdata.TRANSLITERATION_TABLE[r]; ok {
+			b.WriteString(repl)
+		} else {
+			b.WriteRune(r)
+		}
+	}
+
+	return b.String()
+}
+
+func removeDiacritics(s string) string {
+	t := transform.Chain(
+		norm.NFD,
+		runes.Remove(runes.In(unicode.Mn)),
+		norm.NFC,
+	)
+	out, _, err := transform.String(t, s)
+	if err != nil {
+		return s
+	}
+	return out
+}