Breaking 05_03 in twain

Ch05/05_03_End/Website/Controllers/ImagesController.cs

@@ -0,0 +1,82 @@
+using System.Linq;
+using System.Web.Mvc;
+using HPlusSports.Models;
+
+namespace HPlusSports.Controllers
+{
+    public class ImagesController : Controller
+    {
+        private readonly HPlusSportsDbContext _context;
+
+        public ImagesController()
+            : this(new HPlusSportsDbContext())
+        {
+        }
+
+        public ImagesController(HPlusSportsDbContext context)
+        {
+            _context = context;
+        }
+
+        // /images/category/{SKU}
+        // Redirects to the main image for a category
+        public ActionResult Category(string id)
+        {
+            var imageId =
+                _context.Categories
+                    .Where(x => x.Key == id)
+                    .Select(x => x.ImageId)
+                    .FirstOrDefault();
+
+            return Image(imageId);
+        }
+
+        // /images/product/{SKU}
+        // Redirects to the main image for a product
+        public ActionResult Product(string id)
+        {
+            var imageId =
+                _context.Products
+                    .Where(x => x.SKU == id)
+                    .SelectMany(x => x.Images.Select(img => img.Id))
+                    .FirstOrDefault();
+
+            return Image(imageId);
+        }
+
+        public ActionResult Image(long? id)
+        {
+            var image = _context.Images.FirstOrDefault(x => x.Id == id);
+
+            if (!string.IsNullOrWhiteSpace(image.Url))
+            {
+                return RedirectPermanent(image.Url);
+            }
+
+            if (image?.Content == null)
+            {
+                image = GetPlaceholderImage();
+            }
+
+            return File(image.Content, image.ContentType);
+        }
+
+
+        internal static volatile byte[] PlaceholderImageContent;
+
+        private Image GetPlaceholderImage()
+        {
+            if (PlaceholderImageContent == null)
+            {
+                var path = Server.MapPath("~/Content/placeholder.jpg");
+                PlaceholderImageContent = System.IO.File.ReadAllBytes(path);
+            }
+
+            return new Image
+            {
+                Content = PlaceholderImageContent,
+                ContentType = "image/jpeg"
+            };
+        }
+    }
+}