Handle ratelimit api response for newznab caps endpoint on certain newznab indexers that have caps behind the apikey

src/NzbDrone.Core/Indexers/Newznab/NewznabRssParser.cs

@@ -2,7 +2,9 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Xml.Linq;
+using MonoTorrent;
 using NzbDrone.Common.Extensions;
+using NzbDrone.Common.Http;
 using NzbDrone.Core.Indexers.Exceptions;
 using NzbDrone.Core.Parser.Model;
 
@@ -18,20 +20,19 @@ namespace NzbDrone.Core.Indexers.Newznab
             UseEnclosureUrl = true;
         }
 
-        protected override bool PreProcess(IndexerResponse indexerResponse)
+        public static void CheckError(XDocument xdoc, IndexerResponse indexerResponse)
         {
-            var xdoc = LoadXmlDocument(indexerResponse);
             var error = xdoc.Descendants("error").FirstOrDefault();
 
-            if (error == null) return true;
+            if (error == null)
+                return;
 
             var code = Convert.ToInt32(error.Attribute("code").Value);
             var errorMessage = error.Attribute("description").Value;
 
             if (code >= 100 && code <= 199)
             {
-                _logger.Warn("Invalid API Key: {0}", errorMessage);
-                throw new ApiKeyException("Invalid API key");
+                throw new ApiKeyException(errorMessage);
             }
 
             if (!indexerResponse.Request.Url.FullUri.Contains("apikey=") && (errorMessage == "Missing parameter" || errorMessage.Contains("apikey")))
@@ -47,6 +48,15 @@ namespace NzbDrone.Core.Indexers.Newznab
             throw new NewznabException(indexerResponse, errorMessage);
         }
 
+        protected override bool PreProcess(IndexerResponse indexerResponse)
+        {
+            var xdoc = LoadXmlDocument(indexerResponse);
+
+            CheckError(xdoc, indexerResponse);
+
+            return true;
+        }
+
         protected override bool PostProcess(IndexerResponse indexerResponse, List<XElement> items, List<ReleaseInfo> releases)
         {
             var enclosureTypes = items.SelectMany(GetEnclosures).Select(v => v.Type).Distinct().ToArray();