Backport pull request #11699 from jellyfin/release-10.9.z

Use MediaType instead of ToString and add text/ as disallowed mimetypes

Original-merge: 46c748d

Merged-by: joshuaboniface <joshua@boniface.me>

Backported-by: Joshua M. Boniface <joshua@boniface.me>

src/Jellyfin.LiveTv/TunerHosts/M3UTunerHost.cs

@@ -32,6 +32,8 @@ public class M3UTunerHost : BaseTunerHost, ITunerHost, IConfigurableTunerHost
     {
         private static readonly string[] _disallowedMimeTypes =
         {
+            "text/plain",
+            "text/html",
             "video/x-matroska",
             "video/mp4",
             "application/vnd.apple.mpegurl",
@@ -118,7 +120,7 @@ protected override async Task<ILiveStream> GetChannelStream(TunerHostInfo tunerH
 
                 if (response.IsSuccessStatusCode)
                 {
-                    if (!_disallowedMimeTypes.Contains(response.Content.Headers.ContentType?.ToString(), StringComparison.OrdinalIgnoreCase))
+                    if (!_disallowedMimeTypes.Contains(response.Content.Headers.ContentType?.MediaType, StringComparison.OrdinalIgnoreCase))
                     {
                         return new SharedHttpStream(mediaSource, tunerHost, streamId, FileSystem, _httpClientFactory, Logger, Config, _appHost, _streamHelper);
                     }