Add channel queries to series (#13356)

Currently, the IChannel interface can deliver channel result folders which are interpreted as series and seasons. However, Jellyfin does not query for the contents of these folders when viewing said serie of season. This results in empty series in the API.

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -23,6 +23,7 @@ using MediaBrowser.Controller.Chapters;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Dto;
 using MediaBrowser.Controller.Entities.Audio;
+using MediaBrowser.Controller.Entities.TV;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Persistence;
 using MediaBrowser.Controller.Providers;
@@ -1683,7 +1684,7 @@ namespace MediaBrowser.Controller.Entities
 
         public virtual string GetClientTypeName()
         {
-            if (IsFolder && SourceType == SourceType.Channel && this is not Channel)
+            if (IsFolder && SourceType == SourceType.Channel && this is not Channel && this is not Season && this is not Series)
             {
                 return "ChannelFolderItem";
             }

MediaBrowser.Controller/Entities/TV/Season.cs

@@ -7,6 +7,7 @@ using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using System.Text.Json.Serialization;
+using System.Threading;
 using Jellyfin.Data.Enums;
 using Jellyfin.Database.Implementations.Entities;
 using Jellyfin.Extensions;
@@ -152,6 +153,21 @@ namespace MediaBrowser.Controller.Entities.TV
 
         protected override QueryResult<BaseItem> GetItemsInternal(InternalItemsQuery query)
         {
+            if (SourceType == SourceType.Channel)
+            {
+                try
+                {
+                    query.Parent = this;
+                    query.ChannelIds = new[] { ChannelId };
+                    return ChannelManager.GetChannelItemsInternal(query, new Progress<double>(), CancellationToken.None).GetAwaiter().GetResult();
+                }
+                catch
+                {
+                    // Already logged at lower levels
+                    return new QueryResult<BaseItem>();
+                }
+            }
+
             if (query.User is null)
             {
                 return base.GetItemsInternal(query);

MediaBrowser.Controller/Entities/TV/Series.cs

@@ -226,6 +226,21 @@ namespace MediaBrowser.Controller.Entities.TV
         {
             var user = query.User;
 
+            if (SourceType == SourceType.Channel)
+            {
+                try
+                {
+                    query.Parent = this;
+                    query.ChannelIds = [ChannelId];
+                    return ChannelManager.GetChannelItemsInternal(query, new Progress<double>(), CancellationToken.None).GetAwaiter().GetResult();
+                }
+                catch
+                {
+                    // Already logged at lower levels
+                    return new QueryResult<BaseItem>();
+                }
+            }
+
             if (query.Recursive)
             {
                 var seriesKey = GetUniqueSeriesKey(this);
@@ -372,7 +387,25 @@ namespace MediaBrowser.Controller.Entities.TV
                 query.IsMissing = false;
             }
 
-            var allItems = LibraryManager.GetItemList(query);
+            IReadOnlyList<BaseItem> allItems;
+            if (SourceType == SourceType.Channel)
+            {
+                try
+                {
+                    query.Parent = parentSeason;
+                    query.ChannelIds = [ChannelId];
+                    allItems = [.. ChannelManager.GetChannelItemsInternal(query, new Progress<double>(), CancellationToken.None).GetAwaiter().GetResult().Items];
+                }
+                catch
+                {
+                    // Already logged at lower levels
+                    return [];
+                }
+            }
+            else
+            {
+                allItems = LibraryManager.GetItemList(query);
+            }
 
             return GetSeasonEpisodes(parentSeason, user, allItems, options, shouldIncludeMissingEpisodes);
         }