Add thumbnail file creation

Controllers/ProductsController.cs

@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using MyDarling.Models;
+using MyDarling.Services;
 
 namespace MyDarling.Controllers
 {
@@ -11,11 +12,13 @@ namespace MyDarling.Controllers
 	{
 		private DataContext context;
 		private IWebHostEnvironment environment;
+		private IImageResizer resizer;
 
-        public ProductsController(DataContext context, IWebHostEnvironment environment)
+		public ProductsController(DataContext context, IImageResizer resizer, IWebHostEnvironment environment)
 		{
 			this.environment = environment;
 			this.context = context;
+			this.resizer = resizer;
 		}
 
 		public IActionResult Index()
@@ -67,6 +70,7 @@ namespace MyDarling.Controllers
 			}
 
 			var file = Request.Form.Files.FirstOrDefault();
+			string fullPath = string.Empty;
 
 			if (await TryUpdateModelAsync<Product>(
 				product,
@@ -78,15 +82,21 @@ namespace MyDarling.Controllers
 					var newFigure = new Figure(string.Empty, product.Id);
 					product.Figures.Add(newFigure);
 					string filePath = $"/Content/{product.Id}/{newFigure.Id}.jpg";
-                    var savePath = environment.WebRootPath + "/Content/" + product.Id + "/";
+					string directoryPath = environment.WebRootPath + "/Content/" + product.Id + "/";
-                    if (!Directory.Exists(savePath))
+					fullPath = environment.WebRootPath + filePath;
+					if (!Directory.Exists(directoryPath))
 					{
-                        Directory.CreateDirectory(savePath);
+						Directory.CreateDirectory(directoryPath);
 					}			
-                    using var fileStream = new FileStream(environment.WebRootPath + filePath, FileMode.Create);
+					using var fileStream = new FileStream(fullPath, FileMode.Create);
 					await file.CopyToAsync(fileStream);
 				}
 				
+				if (!string.IsNullOrEmpty(fullPath))
+				{					
+					resizer.CreateThumbnail(fullPath);
+				}
+
 				try
 				{
 					await context.SaveChangesAsync();

MyDarling.csproj

@@ -13,6 +13,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.2" />
+    <PackageReference Include="SkiaSharp" Version="2.88.3" />
   </ItemGroup>
 
 </Project>

Program.cs

@@ -1,7 +1,9 @@
 using Microsoft.EntityFrameworkCore;
 using MyDarling.Models;
+using MyDarling.Services;
 using Microsoft.AspNetCore.Identity;
 
+
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddDbContext<DataContext>(opts =>
@@ -25,6 +27,7 @@ builder.Services.Configure<IdentityOptions>( opts =>
 	opts.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyz";
 });
 
+builder.Services.AddTransient<IImageResizer, ImageResizer>();
 builder.Services.AddControllersWithViews();
 builder.Services.AddRazorPages();
 

Services/IImageResizer.cs

@@ -0,0 +1,8 @@
+namespace MyDarling.Services
+{
+    public interface IImageResizer
+	{
+		public void CreateThumbnail(string filePath);
+		public void DownsizeImage(string filePath);
+	}
+}

Services/ImageResizer.cs

@@ -0,0 +1,43 @@
+using SkiaSharp;
+
+namespace MyDarling.Services
+{
+    public class ImageResizer : IImageResizer
+	{
+		const int size = 400;
+		const int quality = 75;
+		public void CreateThumbnail(string inputPath)
+		{
+			using var input = File.OpenRead(inputPath);
+			using var inputStream = new SKManagedStream(input);
+			using var original = SKBitmap.Decode(inputStream);
+
+			int width, height;
+			if (original.Width > original.Height)
+			{
+				width = size;
+				height = original.Height * size / original.Width;
+			}
+			else
+			{
+				width = original.Width * size / original.Height;
+				height = size;
+			}
+
+			using var resized = original.Resize(new SKImageInfo(width, height), SKFilterQuality.High);
+			if (resized == null) return;
+
+			using var image = SKImage.FromBitmap(resized);
+			var outputPath = Path.GetDirectoryName(inputPath) + "\\" +
+				Path.GetFileNameWithoutExtension(inputPath) + "_thumb.jpg";
+			using var output = File.OpenWrite(outputPath);
+
+			image.Encode(SKEncodedImageFormat.Jpeg, quality).SaveTo(output);
+		}
+
+		public void DownsizeImage(string filePath)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}