feat: game lobby service

user/internal/service/shared/normalize.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"galaxy/user/internal/domain/common"
+	"galaxy/util"
 
 	"golang.org/x/text/language"
 )
@@ -36,14 +37,29 @@ func ParseUserID(value string) (common.UserID, error) {
 	return userID, nil
 }
 
-// ParseRaceName trims value and validates it as one exact stored race name.
-func ParseRaceName(value string) (common.RaceName, error) {
-	raceName := common.RaceName(NormalizeString(value))
-	if err := raceName.Validate(); err != nil {
+// ParseUserName trims value and validates it as one exact stored user name.
+func ParseUserName(value string) (common.UserName, error) {
+	userName := common.UserName(NormalizeString(value))
+	if err := userName.Validate(); err != nil {
 		return "", InvalidRequest(err.Error())
 	}
 
-	return raceName, nil
+	return userName, nil
+}
+
+// ParseDisplayName trims value and validates it as one self-service display
+// name. An empty trimmed value is accepted and represents a reset to no
+// display name.
+func ParseDisplayName(value string) (common.DisplayName, error) {
+	trimmed := NormalizeString(value)
+	if trimmed == "" {
+		return "", nil
+	}
+	if _, ok := util.ValidateTypeName(trimmed); !ok {
+		return "", InvalidRequest(fmt.Sprintf("display_name %q is invalid", trimmed))
+	}
+
+	return common.DisplayName(trimmed), nil
 }
 
 // ParseReasonCode trims value and validates it as one machine-readable reason