fix: canonicalize phone numbers as E.164

server/db/mysql/user_identity.go

@@ -3,6 +3,29 @@
 
 package mysql
 
+import (
+	"strings"
+
+	"github.com/nyaruka/phonenumbers"
+	t "github.com/tinode/chat/server/store/types"
+)
+
+func normalizeUserPhone(value string) (string, error) {
+	value = strings.TrimSpace(strings.TrimPrefix(strings.TrimPrefix(value, "tel:"), "basic:"))
+	if value == "" {
+		return "", t.ErrMalformed
+	}
+	number, err := phonenumbers.Parse(value, "CN")
+	if err != nil || !phonenumbers.IsValidNumber(number) {
+		return "", t.ErrMalformed
+	}
+	numberType := phonenumbers.GetNumberType(number)
+	if numberType != phonenumbers.MOBILE && numberType != phonenumbers.FIXED_LINE_OR_MOBILE {
+		return "", t.ErrMalformed
+	}
+	return phonenumbers.Format(number, phonenumbers.E164), nil
+}
+
 func withoutUserTags(update map[string]any) map[string]any {
 	if update == nil {
 		return nil