Validation for bulk series editor

Closes #4983

src/Lidarr.Api.V1/Artist/ArtistEditorController.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using FluentValidation;
 using Lidarr.Api.V1.Albums;
 using Lidarr.Http;
 using Microsoft.AspNetCore.Mvc;
@@ -16,12 +17,14 @@ namespace Lidarr.Api.V1.Artist
         private readonly IArtistService _artistService;
         private readonly IAlbumService _albumService;
         private readonly IManageCommandQueue _commandQueueManager;
+        private readonly ArtistEditorValidator _artistEditorValidator;
 
-        public ArtistEditorController(IArtistService artistService, IAlbumService albumService, IManageCommandQueue commandQueueManager)
+        public ArtistEditorController(IArtistService artistService, IAlbumService albumService, IManageCommandQueue commandQueueManager, ArtistEditorValidator artistEditorValidator)
         {
             _artistService = artistService;
             _albumService = albumService;
             _commandQueueManager = commandQueueManager;
+            _artistEditorValidator = artistEditorValidator;
         }
 
         [HttpPut]
@@ -80,6 +83,13 @@ namespace Lidarr.Api.V1.Artist
                             break;
                     }
                 }
+
+                var validationResult = _artistEditorValidator.Validate(artist);
+
+                if (!validationResult.IsValid)
+                {
+                    throw new ValidationException(validationResult.Errors);
+                }
             }
 
             if (artistToMove.Any())

src/Lidarr.Api.V1/Artist/ArtistEditorValidator.cs

@@ -0,0 +1,26 @@
+using FluentValidation;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Validation;
+using NzbDrone.Core.Validation.Paths;
+
+namespace Lidarr.Api.V1.Artist
+{
+    public class ArtistEditorValidator : AbstractValidator<NzbDrone.Core.Music.Artist>
+    {
+        public ArtistEditorValidator(RootFolderExistsValidator rootFolderExistsValidator, QualityProfileExistsValidator qualityProfileExistsValidator, MetadataProfileExistsValidator metadataProfileExistsValidator)
+        {
+            RuleFor(a => a.RootFolderPath).Cascade(CascadeMode.Stop)
+                .IsValidPath()
+                .SetValidator(rootFolderExistsValidator)
+                .When(a => a.RootFolderPath.IsNotNullOrWhiteSpace());
+
+            RuleFor(c => c.QualityProfileId).Cascade(CascadeMode.Stop)
+                .ValidId()
+                .SetValidator(qualityProfileExistsValidator);
+
+            RuleFor(c => c.MetadataProfileId).Cascade(CascadeMode.Stop)
+                .ValidId()
+                .SetValidator(metadataProfileExistsValidator);
+        }
+    }
+}