Restrict nzbs based on release group, server side

New: Only grab NZBs if release group is wanted (configurable)

NzbDrone.Core/Providers/DecisionEngine/AllowedReleaseGroupSpecification.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Linq;
+using NLog;
+using Ninject;
+using NzbDrone.Core.Model;
+using NzbDrone.Core.Providers.Core;
+
+namespace NzbDrone.Core.Providers.DecisionEngine
+{
+    public class AllowedReleaseGroupSpecification
+    {
+        private readonly ConfigProvider _configProvider;
+        private static readonly Logger logger = LogManager.GetCurrentClassLogger();
+
+        [Inject]
+        public AllowedReleaseGroupSpecification(ConfigProvider configProvider)
+        {
+            _configProvider = configProvider;
+        }
+
+        public AllowedReleaseGroupSpecification()
+        {
+            
+        }
+
+        public virtual bool IsSatisfiedBy(EpisodeParseResult subject)
+        {
+            logger.Trace("Beginning release group check for: {0}", subject);
+
+            var allowed = _configProvider.AllowedReleaseGroups;
+
+            if (string.IsNullOrWhiteSpace(allowed))
+                return true;
+
+            foreach(var group in allowed.Trim(',', ' ').Split(','))
+            {
+                if (subject.ReleaseGroup.Equals(group.Trim(' '), StringComparison.CurrentCultureIgnoreCase))
+                {
+                    logger.Trace("Item: {0}'s release group is wanted: {1}", subject, subject.ReleaseGroup);
+                    return true;
+                }
+            }
+            
+            logger.Trace("Item: {0}'s release group is not wanted: {1}", subject, subject.ReleaseGroup);
+            return false;
+        }    
+    }
+}