New: (Torznab) Add `magneturl' attribute

src/NzbDrone.Core/IndexerSearch/NewznabResults.cs

@@ -85,7 +85,7 @@ namespace NzbDrone.Core.IndexerSearch
                             r.InfoUrl == null ? null : new XElement("comments", r.InfoUrl),
                             r.PublishDate == DateTime.MinValue ? new XElement("pubDate", XmlDateFormat(DateTime.Now)) : new XElement("pubDate", XmlDateFormat(r.PublishDate)),
                             new XElement("size", r.Size),
-                            new XElement("link", r.DownloadUrl ?? t.MagnetUrl ?? string.Empty),
+                            new XElement("link", r.DownloadUrl ?? string.Empty),
                             r.Categories == null ? null : from c in r.Categories select new XElement("category", c.Id),
                             new XElement(
                                 "enclosure",
@@ -115,6 +115,7 @@ namespace NzbDrone.Core.IndexerSearch
                             GetNabElement("label", RemoveInvalidXMLChars(r.Label), protocol),
                             GetNabElement("track", RemoveInvalidXMLChars(r.Track), protocol),
                             GetNabElement("infohash", RemoveInvalidXMLChars(t.InfoHash), protocol),
+                            GetNabElement("magneturl", t.MagnetUrl, protocol),
                             GetNabElement("minimumratio", t.MinimumRatio, protocol),
                             GetNabElement("minimumseedtime", t.MinimumSeedTime, protocol),
                             GetNabElement("downloadvolumefactor", t.DownloadVolumeFactor, protocol),

src/Prowlarr.Api.V1/Indexers/NewznabController.cs

@@ -184,9 +184,11 @@ namespace NzbDrone.Api.V1.Indexers
                     {
                         result.DownloadUrl = result.DownloadUrl.IsNotNullOrWhiteSpace() ? _downloadMappingService.ConvertToProxyLink(new Uri(result.DownloadUrl), request.server, indexerDef.Id, result.Title).AbsoluteUri : null;
 
-                        if (result.DownloadProtocol == DownloadProtocol.Torrent)
+                        if (result.DownloadProtocol == DownloadProtocol.Torrent &&
+                            result is TorrentInfo torrentRelease &&
+                            torrentRelease.MagnetUrl.IsNotNullOrWhiteSpace())
                         {
-                            ((TorrentInfo)result).MagnetUrl = ((TorrentInfo)result).MagnetUrl.IsNotNullOrWhiteSpace() ? _downloadMappingService.ConvertToProxyLink(new Uri(((TorrentInfo)result).MagnetUrl), request.server, indexerDef.Id, result.Title).AbsoluteUri : null;
+                            result.DownloadUrl ??= _downloadMappingService.ConvertToProxyLink(new Uri(torrentRelease.MagnetUrl), request.server, indexerDef.Id, torrentRelease.Title).AbsoluteUri;
                         }
                     }