Added checks for existing permissions when creating, updating and deleting permissions.

Requests/CreateGroupPermission.cs

@@ -31,6 +31,11 @@ namespace HermesSocketServer.Requests
                 Allow = allow,
             };
 
+            if (channel.GroupPermissions.Get().Values.Any(p => p.GroupId == groupId && p.Path == path))
+            {
+                return Task.FromResult(RequestResult.Failed("Permission exists already."));
+            }
+
             bool result = channel.GroupPermissions.Set(id.ToString(), permission);
             if (result)
             {

Requests/DeleteGroupPermission.cs

@@ -18,11 +18,12 @@ namespace HermesSocketServer.Requests
         {
             var id = data["id"].ToString()!;
 
+            var permission = channel.GroupPermissions.Get(id);
             var result = channel.GroupPermissions.Remove(id);
             if (result)
             {
                 _logger.Information($"Deleted a group permission by id [group permission id: {id}]");
-                return Task.FromResult(RequestResult.Successful(null));
+                return Task.FromResult(RequestResult.Successful(permission));
             }
 
             _logger.Warning($"Group Permission Id does not exist [group permission id: {id}]");

Requests/UpdateGroupPermission.cs

@@ -31,6 +31,11 @@ namespace HermesSocketServer.Requests
                 Allow = allow,
             };
 
+            if (!channel.GroupPermissions.Get().Values.Any(p => p.GroupId == groupId && p.Path == path))
+            {
+                return Task.FromResult(RequestResult.Failed("Permission does not exist."));
+            }
+
             bool result = channel.GroupPermissions.Modify(id.ToString(), permission);
             if (result)
             {