From 1a5deabadb76f8411ce2dd75fa739c691cbdb54c Mon Sep 17 00:00:00 2001
From: Asai Neko <sugar@sne.moe>
Date: Wed, 11 Feb 2026 21:51:34 +0800
Subject: [PATCH] Enforce nickname is not null after join event

Signed-off-by: Asai Neko <sugar@sne.moe>
---
 service/service_event/join_event.go | 43 +++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/service/service_event/join_event.go b/service/service_event/join_event.go
index e71eef9..9d986ee 100644
--- a/service/service_event/join_event.go
+++ b/service/service_event/join_event.go
@@ -126,6 +126,49 @@ func (self *EventServiceImpl) JoinEvent(payload *EventJoinPayload) (result *Even
 		return
 	}
 
+	userData, err := new(data.User).GetByUserId(payload.Context, &userId)
+	if err != nil {
+		exception := new(exception.Builder).
+			SetStatus(exception.StatusServer).
+			SetService(exception.ServiceEvent).
+			SetEndpoint(exception.EndpointEventServiceJoin).
+			SetType(exception.TypeCommon).
+			SetOriginal(exception.CommonErrorDatabase).
+			SetError(err).
+			Throw(payload.Context)
+
+		result = &EventJoinResult{
+			Common: shared.CommonResult{
+				HttpCode:  500,
+				Exception: exception,
+			},
+			Data: nil,
+		}
+
+		return
+	}
+
+	if userData.Nickname == "" {
+		exception := new(exception.Builder).
+			SetStatus(exception.StatusUser).
+			SetService(exception.ServiceEvent).
+			SetEndpoint(exception.EndpointEventServiceJoin).
+			SetType(exception.TypeCommon).
+			SetOriginal(exception.CommonErrorInvalidInput).
+			SetError(errors.New("user nickname is empty")).
+			Throw(payload.Context)
+
+		result = &EventJoinResult{
+			Common: shared.CommonResult{
+				HttpCode:  500,
+				Exception: exception,
+			},
+			Data: nil,
+		}
+
+		return
+	}
+
 	attendenceSearch, err := new(data.Attendance).GetAttendance(payload.Context, eventId, userId)
 
 	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {