1 files changed, 54 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Services/Imaging/ImageService.cs b/BackEnd/Timeline/Services/Imaging/ImageService.cs
new file mode 100644
index 00000000..9fefe3e9
--- /dev/null
+++ b/BackEnd/Timeline/Services/Imaging/ImageService.cs
@@ -0,0 +1,54 @@
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Formats;
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Timeline.Services.Imaging
+{
+
+    public class ImageService : IImageService
+    {
+        public async Task<IImageFormat> DetectFormatAsync(byte[] data, CancellationToken cancellationToken = default)
+        {
+            if (data == null)
+                throw new ArgumentNullException(nameof(data));
+
+            var format = await Task.Run(() =>
+            {
+                var format = Image.DetectFormat(data);
+                if (format is null)
+                {
+                    throw new ImageException(ImageException.ErrorReason.CantDecode, data, null, null, null);
+                }
+                return format;
+            }, cancellationToken);
+            return format;
+        }
+
+        public async Task<IImageFormat> ValidateAsync(byte[] data, string? requestType = null, bool square = false, CancellationToken cancellationToken = default)
+        {
+            if (data == null)
+                throw new ArgumentNullException(nameof(data));
+
+            var format = await Task.Run(() =>
+            {
+                try
+                {
+                    using var image = Image.Load(data, out IImageFormat format);
+                    if (requestType != null && !format.MimeTypes.Contains(requestType))
+                        throw new ImageException(ImageException.ErrorReason.UnmatchedFormat, data, requestType, format.DefaultMimeType);
+                    if (square && image.Width != image.Height)
+                        throw new ImageException(ImageException.ErrorReason.BadSize, data, requestType, format.DefaultMimeType);
+                    return format;
+                }
+                catch (UnknownImageFormatException e)
+                {
+                    throw new ImageException(ImageException.ErrorReason.CantDecode, data, requestType, null, null, e);
+                }
+            }, cancellationToken);
+            return format;
+        }
+    }
+}