enable sync for channels that allow downloading

MediaBrowser.Controller/Channels/IChannelManager.cs

@@ -31,6 +31,8 @@ namespace MediaBrowser.Controller.Channels
         /// <returns>ChannelFeatures.</returns>
         ChannelFeatures GetChannelFeatures(string id);
 
+        bool SupportsSync(string channelId);
+
         /// <summary>
         /// Gets all channel features.
         /// </summary>

MediaBrowser.Server.Implementations/Channels/ChannelManager.cs

@@ -530,6 +530,19 @@ namespace MediaBrowser.Server.Implementations.Channels
             return GetChannelFeaturesDto(channel, channelProvider, channelProvider.GetChannelFeatures());
         }
 
+        public bool SupportsSync(string channelId)
+        {
+            if (string.IsNullOrWhiteSpace(channelId))
+            {
+                throw new ArgumentNullException("channelId");
+            }
+
+            //var channel = GetChannel(channelId);
+            var channelProvider = GetChannelProvider(channelId);
+
+            return channelProvider.GetChannelFeatures().SupportsContentDownloading;
+        }
+
         public ChannelFeatures GetChannelFeaturesDto(Channel channel,
             IChannel provider,
             InternalChannelFeatures features)
@@ -1450,6 +1463,24 @@ namespace MediaBrowser.Server.Implementations.Channels
             return result;
         }
 
+        internal IChannel GetChannelProvider(string internalChannelId)
+        {
+            if (internalChannelId == null)
+            {
+                throw new ArgumentNullException("internalChannelId");
+            }
+
+            var result = GetAllChannels()
+                .FirstOrDefault(i => string.Equals(GetInternalChannelId(i.Name).ToString("N"), internalChannelId, StringComparison.OrdinalIgnoreCase));
+
+            if (result == null)
+            {
+                throw new ResourceNotFoundException("No channel provider found for channel id " + internalChannelId);
+            }
+
+            return result;
+        }
+
         private IEnumerable<BaseItem> ApplyFilters(IEnumerable<BaseItem> items, IEnumerable<ItemFilter> filters, User user)
         {
             foreach (var filter in filters.OrderByDescending(f => (int)f))

MediaBrowser.Server.Implementations/Sync/SyncManager.cs

@@ -541,6 +541,11 @@ namespace MediaBrowser.Server.Implementations.Sync
                 return true;
             }
 
+            if (item.SourceType == SourceType.Channel)
+            {
+                return BaseItem.ChannelManager.SupportsSync(item.ChannelId);
+            }
+
             return item.LocationType == LocationType.FileSystem || item is Season;
         }