Implement server backhole downloading

src/Jackett/Controllers/BlackholeController.cs

@@ -0,0 +1,71 @@
+using Jackett.Services;
+using Newtonsoft.Json.Linq;
+using NLog;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Threading.Tasks;
+using System.Web;
+using System.Web.Http;
+
+namespace Jackett.Controllers
+{
+    [AllowAnonymous]
+    public class BlackholeController : ApiController
+    {
+        private Logger logger;
+        private IIndexerManagerService indexerService;
+
+        public BlackholeController(IIndexerManagerService i, Logger l)
+        {
+            logger = l;
+            indexerService = i;
+        }
+
+        [HttpGet]
+        public async Task<IHttpActionResult> Blackhole(string indexerID, string path)
+        {
+
+            var jsonReply = new JObject();
+            try
+            {
+                var indexer = indexerService.GetIndexer(indexerID);
+                if (!indexer.IsConfigured)
+                {
+                    logger.Warn(string.Format("Rejected a request to {0} which is unconfigured.", indexer.DisplayName));
+                    throw new Exception("This indexer is not configured.");
+                }
+
+                var remoteFile = Encoding.UTF8.GetString(HttpServerUtility.UrlTokenDecode(path));
+                var downloadBytes = await indexer.Download(new Uri(remoteFile, UriKind.RelativeOrAbsolute));
+
+                if (string.IsNullOrWhiteSpace(Engine.Server.Config.BlackholeDir))
+                {
+                    throw new Exception("Blackhole directory not set!");
+                }
+
+                if (!Directory.Exists(Engine.Server.Config.BlackholeDir))
+                {
+                    throw new Exception("Blackhole directory does not exist: " + Engine.Server.Config.BlackholeDir);
+                }
+
+                var fileName = DateTime.Now.Ticks + ".torrent";
+                File.WriteAllBytes(Path.Combine(Engine.Server.Config.BlackholeDir, fileName), downloadBytes);
+                jsonReply["result"] = "success";
+            }
+            catch (Exception ex)
+            {
+                logger.Error(ex, "Error downloading to blackhole " + indexerID + " " + path);
+                jsonReply["result"] = "error";
+                jsonReply["error"] = ex.Message;
+            }
+
+            return Json(jsonReply);
+        }
+    }
+}