Clean UA data

src/NzbDrone.Core/Parser/UserAgentParser.cs

@@ -1,9 +1,12 @@
+using System.Collections.Generic;
 using System.Text.RegularExpressions;
 
 namespace NzbDrone.Core.Parser
 {
     public static class UserAgentParser
     {
+        private static readonly List<string> UserAgentWhiteList = new List<string> { "Radarr", "Sonarr", "Readarr", "Lidarr", "Prowlarr" };
+
         private static readonly Regex AppSourceRegex = new Regex(@"(?<agent>.*)\/.*(\(.*\))?",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
         public static string ParseSource(string userAgent)
@@ -12,7 +15,10 @@ namespace NzbDrone.Core.Parser
 
             if (match.Groups["agent"].Success)
             {
-                return match.Groups["agent"].Value;
+                if (UserAgentWhiteList.Contains(match.Groups["agent"].Value))
+                {
+                    return match.Groups["agent"].Value;
+                }
             }
 
             return "Other";