Function rewriteTag

server/utils.go:377–401

rewriteTag attempts to match the original token against the email and telephone number. The tag is expected to be in lowercase. On success, it returns a slice with the original tag and the tag with the corresponding prefix. It returns an empty slice if the tag is invalid. TODO: consider inferring co

(orig, countryCode string)

// empty slice if the tag is invalid.
// TODO: consider inferring country code from user location.
func rewriteTag(orig, countryCode string) []string {
	// Check if the tag already has a prefix e.g. basic:alice.
	if prefixedTagRegexp.MatchString(orig) {
		return []string{orig}
	}

	// Check if token can be rewritten by any of the validators
	param := map[string]any{"countryCode": countryCode}
	for name, conf := range globals.validators {
		if conf.addToTags {
			val := store.Store.GetValidator(name)
			if tag, _ := val.PreCheck(orig, param); tag != "" {
				return []string{orig, tag}
			}
		}
	}

	if tagRegexp.MatchString(orig) {
		return []string{orig}
	}

	// invalid generic tag

	return nil
}

// rewriteTagSlice calls rewriteTag for each slice member and return a new slice with original and converted values.
func rewriteTagSlice(tags []string, countryCode string) []string {