Added user photo resizing

src/Berufsschule_HAM.csproj

@@ -9,6 +9,7 @@
     <PackageReference Include="Novell.Directory.Ldap.NETStandard" Version="4.0.0" />
     <PackageReference Include="Serilog" Version="4.3.0" />
     <PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="9.0.4" />
     <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="9.0.4" />
     <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="9.0.4" />

src/Controllers/HomeController.cs

@@ -7,6 +7,7 @@ using Berufsschule_HAM.Services;
 using ElmahCore;
 using Berufsschule_HAM.Exceptions;
 using Microsoft.AspNetCore.Authorization;
+using Berufsschule_HAM.Helpers;
 
 [ApiExplorerSettings(IgnoreApi = true)]
 [Route("[controller]")]
@@ -82,9 +83,10 @@ public class HomeController : Controller
         List<UserTableViewModel> UserTableViewModels = [];
         foreach (UserModel user in users)
         {
+            string photo = user.JpegPhoto is not null && user.JpegPhoto.Length > 0 ? ImageHelper.ResizeAndConvertToBase64(Convert.FromBase64String(user.JpegPhoto), 32) : "";
             UserTableViewModels.Add(new()
             {
-                JpegPhoto = user.JpegPhoto ?? "",
+                JpegPhoto = photo,
                 Name = user.Cn ?? "",
                 Surname = user.Sn ?? "",
                 Title = user.Title ?? "",
@@ -95,6 +97,24 @@ public class HomeController : Controller
         return View(new UsersIndexViewModel() { UserTableViewModels = UserTableViewModels });
     }
 
+    [Authorize(Roles = "CanManageUsers")]
+    [HttpGet("UserPhoto")]
+    public async Task<IActionResult> UserPhotoAsync(string uid, int? size)
+    {
+        UserModel? user = await _ldap.GetUserByUidAsync(uid, _ldap.UsersAttributes);
+        if (user is null || user.JpegPhoto is null)
+        {
+            return NotFound();
+        }
+        if (size is null)
+        {
+            return File(Convert.FromBase64String(user.JpegPhoto), "image/jpeg");
+        }
+        string encodedFile = ImageHelper.ResizeAndConvertToBase64(Convert.FromBase64String(user.JpegPhoto), size ?? 32);
+        return File(Convert.FromBase64String(encodedFile), "image/jpeg");
+    }
+
+
     [Authorize(Roles = "CanManageGroups")]
     [HttpGet("Groups")]
     public async Task<ActionResult> GroupsAsync()

src/Helpers/ImageHelper.cs

@@ -0,0 +1,42 @@
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Formats.Jpeg;
+using System.IO;
+using SixLabors.ImageSharp.Formats.Gif;
+using SixLabors.ImageSharp.Processing.Processors.Quantization;
+using SixLabors.ImageSharp.Formats.Png;
+using SixLabors.ImageSharp.Formats.Webp;
+
+namespace Berufsschule_HAM.Helpers;
+
+public static class ImageHelper
+{
+    public static string ResizeAndConvertToBase64(byte[] imageBytes, int size = 32)
+    {
+        size = Math.Min(size, 256);
+        using var inputStream = new MemoryStream(imageBytes);
+        using var image = Image.Load(inputStream);
+
+        // Optional: crop to square before resize
+        int minDimension = Math.Min(image.Width, image.Height);
+        var cropRectangle = new Rectangle(
+            (image.Width - minDimension) / 2,
+            (image.Height - minDimension) / 2,
+            minDimension,
+            minDimension);
+
+        image.Mutate(x =>
+        {
+            x.Crop(cropRectangle);
+            x.Resize(new ResizeOptions
+            {
+                Size = new Size(size, size),
+                Mode = ResizeMode.Crop
+            });
+        });
+
+        using var outputStream = new MemoryStream();
+        image.Save(outputStream, new WebpEncoder(){});
+        return Convert.ToBase64String(outputStream.ToArray());
+    }
+}

src/Views/Home/Users.cshtml

@@ -41,7 +41,7 @@
                 {
                 <tr class="user-row">
                     <td>
-                    <img class="rounded-circle user-icon" src="data:image/jpeg;base64,@userTableViewModel.JpegPhoto" alt="Photo" style="max-width:300px;" />
+                    <img class="rounded-circle user-icon" src="~/Home/UserPhoto?uid=@userTableViewModel.Uid&size=48" alt="Photo" style="width:32px;height:32px;" width="32" height="32" loading="lazy" />
                     </td>
                     <td>@userTableViewModel.Uid</td>
                     <td>@userTableViewModel.Title</td>
@@ -730,13 +730,7 @@
                 // Photo
                 const imgEl = row.querySelector('td:first-child img');
                 const detailPhoto = document.getElementById('detailPhoto');
-                if (imgEl && imgEl.src.startsWith('data:image')) {
-                    detailPhoto.src = imgEl.src;
-                    detailPhoto.style.display = 'block';
-                } else {
-                    detailPhoto.style.display = 'none';
-                }
-
+                detailPhoto.src = `/Home/UserPhoto?uid=${data.uid}&size=256`;
                 detailModal.show();
             });
         });