New: Custom Format Spec Validation

Fixes #7405

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

@@ -1,11 +1,23 @@
+using FluentValidation;
 using NzbDrone.Core.Annotations;
 using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.Qualities;
+using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.CustomFormats
 {
+    public class SourceSpecificationValidator : AbstractValidator<SourceSpecification>
+    {
+        public SourceSpecificationValidator()
+        {
+            RuleFor(c => c.Value).NotEmpty();
+        }
+    }
+
     public class SourceSpecification : CustomFormatSpecificationBase
     {
+        private static readonly SourceSpecificationValidator Validator = new SourceSpecificationValidator();
+
         public override int Order => 5;
         public override string ImplementationName => "Source";
 
@@ -16,5 +28,10 @@ namespace NzbDrone.Core.CustomFormats
         {
             return (movieInfo?.Quality?.Quality?.Source ?? (int)Source.UNKNOWN) == (Source)Value;
         }
+
+        public override NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
     }
 }