New: Validate NZBs before sending to download client

src/NzbDrone.Core/Download/UsenetClientBase.cs

@@ -16,15 +16,18 @@ namespace NzbDrone.Core.Download
         where TSettings : IProviderConfig, new()
     {
         protected readonly IHttpClient _httpClient;
+        private readonly IValidateNzbs _nzbValidationService;
 
         protected UsenetClientBase(IHttpClient httpClient,
                                    IConfigService configService,
                                    IDiskProvider diskProvider,
                                    IRemotePathMappingService remotePathMappingService,
+                                   IValidateNzbs nzbValidationService,
                                    Logger logger)
             : base(configService, diskProvider, remotePathMappingService, logger)
         {
             _httpClient = httpClient;
+            _nzbValidationService = nzbValidationService;
         }
         
         public override DownloadProtocol Protocol => DownloadProtocol.Usenet;
@@ -70,6 +73,8 @@ namespace NzbDrone.Core.Download
                 throw new ReleaseDownloadException(remoteAlbum.Release, "Downloading nzb failed", ex);
             }
 
+            _nzbValidationService.Validate(filename, nzbData);
+
             _logger.Info("Adding report [{0}] to the queue.", remoteAlbum.Release.Title);
             return AddFromNzbFile(remoteAlbum, filename, nzbData);
         }