improve BEncode error handling

src/Jackett.Common/Indexers/BaseIndexer.cs

@@ -34,6 +34,9 @@ namespace Jackett.Common.Indexers
         public string Type { get; protected set; }
         public virtual string ID { get { return GetIndexerID(GetType()); } }
 
+        [JsonConverter(typeof(EncodingJsonConverter))]
+        public Encoding Encoding { get; protected set; }
+
         public virtual bool IsConfigured { get; protected set; }
         protected Logger logger;
         protected IIndexerConfigurationService configurationService;
@@ -835,8 +838,6 @@ namespace Jackett.Common.Indexers
 
         public override TorznabCapabilities TorznabCaps { get; protected set; }
 
-        [JsonConverter(typeof(EncodingJsonConverter))]
-        public Encoding Encoding { get; protected set; }
 
         private List<CategoryMapping> categoryMapping = new List<CategoryMapping>();
         protected WebClient webclient;

src/Jackett.Common/Indexers/IIndexer.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Text;
 using System.Threading.Tasks;
 using Jackett.Common.Models;
 using Jackett.Common.Models.IndexerConfig;
@@ -30,6 +31,7 @@ namespace Jackett.Common.Indexers
         string Language { get; }
         string LastError { get; set; }
         string ID { get; }
+        Encoding Encoding { get; }
 
         TorznabCapabilities TorznabCaps { get; }
 

src/Jackett/Controllers/DownloadController.cs

@@ -71,9 +71,19 @@ namespace Jackett.Controllers
                 }
 
                 // This will fix torrents where the keys are not sorted, and thereby not supported by Sonarr.
+                byte[] sortedDownloadBytes = null;
+                try
+                {
                     var parser = new BencodeParser();
                     var torrentDictionary = parser.Parse(downloadBytes);
-                byte[] sortedDownloadBytes = torrentDictionary.EncodeAsBytes();
+                    sortedDownloadBytes = torrentDictionary.EncodeAsBytes();
+                }
+                catch (Exception e)
+                {
+                    var content = indexer.Encoding.GetString(downloadBytes);
+                    logger.Error(content);
+                    throw new Exception("BencodeParser failed", e);
+                }
 
                 var result = new HttpResponseMessage(HttpStatusCode.OK);
                 result.Content = new ByteArrayContent(sortedDownloadBytes);