Initial commit

2021-02-08 21:13:53 -06:00
commit 4d52e115b5
493 changed files with 31399 additions and 0 deletions
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+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core;
+using LanguageExt;
+using MediatR;
+using Microsoft.Extensions.Caching.Memory;
+using Winista.Mime;
+
+namespace ErsatzTV.Application.Images.Queries
+{
+    public class GetImageContentsHandler : IRequestHandler<GetImageContents, Either<BaseError, ImageViewModel>>
+    {
+        private static readonly MimeTypes MimeTypes = new();
+        private readonly IMemoryCache _memoryCache;
+
+        public GetImageContentsHandler(IMemoryCache memoryCache) => _memoryCache = memoryCache;
+
+        public async Task<Either<BaseError, ImageViewModel>> Handle(
+            GetImageContents request,
+            CancellationToken cancellationToken)
+        {
+            try
+            {
+                return await _memoryCache.GetOrCreateAsync(
+                    request.FileName,
+                    async entry =>
+                    {
+                        entry.SlidingExpiration = TimeSpan.FromHours(1);
+
+                        string fileName = Path.Combine(FileSystemLayout.ImageCacheFolder, request.FileName);
+                        byte[] contents = await File.ReadAllBytesAsync(fileName, cancellationToken);
+                        MimeType mimeType = MimeTypes.GetMimeType(contents);
+                        return new ImageViewModel(contents, mimeType.Name);
+                    });
+            }
+            catch (Exception ex)
+            {
+                return BaseError.New(ex.Message);
+            }
+        }
+    }
+}