Revert "Remove UpdateLibrariesTask"

This reverts commit de14ff0b75.

Tranga/TrangaTask.cs

@@ -12,6 +12,7 @@ namespace Tranga;
 /// Stores information on Task, when implementing new Tasks also update the serializer
 /// </summary>
 [JsonDerivedType(typeof(MonitorPublicationTask), 2)]
+[JsonDerivedType(typeof(UpdateLibrariesTask), 3)]
 [JsonDerivedType(typeof(DownloadChapterTask), 4)]
 public abstract class TrangaTask
 {
@@ -130,19 +131,19 @@ public abstract class TrangaTask
             return objectType == typeof(TrangaTask);
         }
 
-        public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
+        public override object ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
         {
             JObject jo = JObject.Load(reader);
             if (jo["task"]!.Value<Int64>() == (Int64)Task.MonitorPublication)
                 return jo.ToObject<MonitorPublicationTask>(serializer)!;
 
             if (jo["task"]!.Value<Int64>() == (Int64)Task.UpdateLibraries)
-                return null;
+                return jo.ToObject<UpdateLibrariesTask>(serializer)!;
             
             if (jo["task"]!.Value<Int64>() == (Int64)Task.DownloadChapter)
                 return jo.ToObject<DownloadChapterTask>(serializer)!;
 
-            throw new Exception($"Deserialization: Unknown type {objectType} for TrangaTask");
+            throw new Exception();
         }
 
         public override bool CanWrite => false;

Tranga/TrangaTasks/UpdateLibrariesTask.cs

@@ -0,0 +1,33 @@
+using System.Net;
+using Logging;
+
+namespace Tranga.TrangaTasks;
+
+/// <summary>
+/// LEGACY DEPRECATED
+/// </summary>
+public class UpdateLibrariesTask : TrangaTask
+{
+    public UpdateLibrariesTask(TimeSpan reoccurrence) : base(Task.UpdateLibraries, reoccurrence)
+    {
+    }
+
+    protected override HttpStatusCode ExecuteTask(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null)
+    {
+        if (cancellationToken?.IsCancellationRequested ?? false)
+            return HttpStatusCode.RequestTimeout;
+        foreach(LibraryManager lm in taskManager.settings.libraryManagers)
+            lm.UpdateLibrary();
+        return HttpStatusCode.OK;
+    }
+
+    public override TrangaTask Clone()
+    {
+        return new UpdateLibrariesTask(this.reoccurrence);
+    }
+
+    protected override double GetProgress()
+    {
+        return 1;
+    }
+}