From d62eea604ad6f7e80b30f05a1b7ddac29fde6481 Mon Sep 17 00:00:00 2001
From: Bogdan <mynameisbogdan@users.noreply.github.com>
Date: Tue, 8 Apr 2025 02:43:58 +0300
Subject: [PATCH] Validation for tags label

---
 src/Sonarr.Api.V3/Tags/TagController.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Sonarr.Api.V3/Tags/TagController.cs b/src/Sonarr.Api.V3/Tags/TagController.cs
index c4880657b..3c8bdb783 100644
--- a/src/Sonarr.Api.V3/Tags/TagController.cs
+++ b/src/Sonarr.Api.V3/Tags/TagController.cs
@@ -1,4 +1,6 @@
 using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using FluentValidation;
 using Microsoft.AspNetCore.Mvc;
 using NzbDrone.Core.AutoTagging;
 using NzbDrone.Core.Datastore.Events;
@@ -23,6 +25,11 @@ public TagController(IBroadcastSignalRMessage signalRBroadcaster,
             : base(signalRBroadcaster)
         {
             _tagService = tagService;
+
+            SharedValidator.RuleFor(c => c.Label).Cascade(CascadeMode.Stop)
+                .NotEmpty()
+                .Matches("^[a-z0-9-]+$", RegexOptions.IgnoreCase)
+                .WithMessage("Allowed characters a-z, 0-9 and -");
         }
 
         protected override TagResource GetResourceById(int id)