add plex fanart

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -117,6 +117,21 @@ namespace ErsatzTV.Infrastructure.Plex
                 metadata.Artwork.Add(artwork);
             }
 
+            if (!string.IsNullOrWhiteSpace(response.Art))
+            {
+                var path = $"plex/{mediaSourceId}{response.Art}";
+                var artwork = new Artwork
+                {
+                    ArtworkKind = ArtworkKind.FanArt,
+                    Path = path,
+                    DateAdded = dateAdded,
+                    DateUpdated = lastWriteTime
+                };
+
+                metadata.Artwork ??= new List<Artwork>();
+                metadata.Artwork.Add(artwork);
+            }
+
             var version = new MediaVersion
             {
                 Name = "Main",

ErsatzTV/Controllers/ArtworkController.cs

@@ -73,6 +73,32 @@ namespace ErsatzTV.Controllers
                         response.Content.Headers.ContentType?.MediaType ?? "image/jpeg");
                 });
         }
+        
+        [HttpGet("/artwork/fanart/plex/{plexMediaSourceId}/{*path}")]
+        public async Task<IActionResult> GetPlexFanArt(int plexMediaSourceId, string path)
+        {
+            Either<BaseError, PlexConnectionParametersViewModel> connectionParameters =
+                await _mediator.Send(new GetPlexConnectionParameters(plexMediaSourceId));
+
+            return await connectionParameters.Match<Task<IActionResult>>(
+                Left: _ => new NotFoundResult().AsTask<IActionResult>(),
+                Right: async r =>
+                {
+                    HttpClient client = _httpClientFactory.CreateClient();
+                    client.DefaultRequestHeaders.Add("X-Plex-Token", r.AuthToken);
+
+                    var transcodePath = $"/{path}";
+                    var fullPath = new Uri(r.Uri, transcodePath);
+                    HttpResponseMessage response = await client.GetAsync(
+                        fullPath,
+                        HttpCompletionOption.ResponseHeadersRead);
+                    Stream stream = await response.Content.ReadAsStreamAsync();
+
+                    return new FileStreamResult(
+                        stream,
+                        response.Content.Headers.ContentType?.MediaType ?? "image/jpeg");
+                });
+        }
 
         [HttpGet("/artwork/thumbnails/{fileName}")]
         public async Task<IActionResult> GetThumbnail(string fileName)