From 74dac9f50669c2135ff05f4786a3005ac0af5575 Mon Sep 17 00:00:00 2001
From: SirConstance <sirconstance@pm.me>
Date: Fri, 19 Sep 2025 23:25:20 +0200
Subject: [PATCH] Enforcing Unique groupe aliases

---
 .../MareSynchronosServer/Hubs/MareHub.Groups.cs          | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/MareSynchronosServer/MareSynchronosServer/Hubs/MareHub.Groups.cs b/MareSynchronosServer/MareSynchronosServer/Hubs/MareHub.Groups.cs
index 2fecbbe..8f4075e 100644
--- a/MareSynchronosServer/MareSynchronosServer/Hubs/MareHub.Groups.cs
+++ b/MareSynchronosServer/MareSynchronosServer/Hubs/MareHub.Groups.cs
@@ -231,6 +231,15 @@ public partial class MareHub
             {
                 sanitizedAlias = sanitizedAlias[..50];
             }
+
+            var normalizedAlias = sanitizedAlias.ToLowerInvariant();
+            var aliasExists = await DbContext.Groups
+                .AnyAsync(g => g.Alias != null && g.Alias.ToLower() == normalizedAlias)
+                .ConfigureAwait(false);
+            if (aliasExists)
+            {
+                throw new System.Exception("Syncshell name is already in use.");
+            }
         }
 
         Group newGroup = new()