New: Custom Format Spec Validation

Fixes #7405

src/NzbDrone.Core/CustomFormats/Specifications/IndexerFlagSpecification.cs

@@ -1,11 +1,31 @@
+using System;
 using System.Collections.Generic;
+using FluentValidation;
 using NzbDrone.Core.Annotations;
 using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.CustomFormats
 {
+    public class IndexerFlagSpecificationValidator : AbstractValidator<IndexerFlagSpecification>
+    {
+        public IndexerFlagSpecificationValidator()
+        {
+            RuleFor(c => c.Value).NotEmpty();
+            RuleFor(c => c.Value).Custom((qualityValue, context) =>
+            {
+                if (!Enum.IsDefined(typeof(IndexerFlags), qualityValue))
+                {
+                    context.AddFailure(string.Format("Invalid indexer flag condition value: {0}", qualityValue));
+                }
+            });
+        }
+    }
+
     public class IndexerFlagSpecification : CustomFormatSpecificationBase
     {
+        private static readonly IndexerFlagSpecificationValidator Validator = new IndexerFlagSpecificationValidator();
+
         public override int Order => 4;
         public override string ImplementationName => "Indexer Flag";
 
@@ -17,5 +37,10 @@ namespace NzbDrone.Core.CustomFormats
             var flags = movieInfo?.ExtraInfo?.GetValueOrDefault("IndexerFlags") as IndexerFlags?;
             return flags?.HasFlag((IndexerFlags)Value) == true;
         }
+
+        public override NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
     }
 }