Merge pull request #325 from LD-Reborn/319-feature-user-image-pre-loading

319 feature user image pre loading

src/Helpers/ImageHelper.cs

@@ -1,6 +1,7 @@
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.Formats.Webp;
 using SixLabors.ImageSharp.Formats;
+using Berufsschule_HAM.Models;
 
 namespace Berufsschule_HAM.Helpers;
 
@@ -35,4 +36,19 @@ public static class ImageHelper
         }
         return result;
     }
+
+    public static async Task PreloadUsers(IEnumerable<UserModel> userModels, UserImagePreloadType? preloadType)
+    {
+        if (preloadType is null || preloadType == UserImagePreloadType.None) return;
+
+        foreach (UserModel user in userModels)
+        {
+            if (user.JpegPhoto is null) continue;
+            ResizeAndConvertToWebp(user.JpegPhoto, 48);
+            if (preloadType == UserImagePreloadType.FullSized)
+            {
+                ResizeAndConvertToWebp(user.JpegPhoto, 256);
+            }
+        }
+    }
 }

src/Models/AdminSettingsModel.cs

@@ -11,9 +11,17 @@ public class AdminSettingsModel
     public required string BarcodeText { get; set; }
     public required Dictionary<string, Preset> Presets { get; set; }
     public HashAlgorithm? hashAlgorithm;
+    public UserImagePreloadType? UserImagePreloadType { get; set; } = Models.UserImagePreloadType.None;
 }
 
 public class Preset
 {
     public required Dictionary<string, string> Attribute { get; set; }
+}
+
+public enum UserImagePreloadType
+{
+    None,
+    Icons,
+    FullSized
 }

src/Program.cs

@@ -34,6 +34,7 @@ builder.Services.AddElmah<XmlFileErrorLog>(Options =>
 
 builder.Services.AddSingleton<LdapService>();
 builder.Services.AddHostedService<MigrationService>();
+builder.Services.AddHostedService<ImagePreloadService>();
 
 builder.Services.AddHealthChecks()
     .AddCheck<DatabaseHealthCheck>("DatabaseHealthCheck");

src/Resources/Views.Settings.Admin.de.resx

@@ -88,4 +88,17 @@
   <data name="Error contacting server" xml:space="preserve">
     <value>Fehler bei der Kommunikation mit dem Server</value>
   </data>
+
+  <data name="User image preloading" xml:space="preserve">
+    <value>Benutzerprofilbilder im Voraus laden</value>
+  </data>
+  <data name="userImagePreloadType_None" xml:space="preserve">
+    <value>Benutzerprofilbilder nicht laden</value>
+  </data>
+  <data name="userImagePreloadType_Icons" xml:space="preserve">
+    <value>48x48 (empfohlen)</value>
+  </data>
+  <data name="userImagePreloadType_FullSized" xml:space="preserve">
+    <value>48x48 + 256x256</value>
+  </data>
 </root>

src/Resources/Views.Settings.Admin.en.resx

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+    <resheader name="resmimetype">
+        <value>text/microsoft-resx</value>
+    </resheader>
+    <resheader name="version">
+        <value>2.0</value>
+    </resheader>
+    <resheader name="reader">
+        <value>System.Resources.ResXResourceReader, System.Windows.Forms, ...</value>
+    </resheader>
+    <resheader name="writer">
+        <value>System.Resources.ResXResourceWriter, System.Windows.Forms, ...</value>
+    </resheader>
+
+  <data name="userImagePreloadType_None" xml:space="preserve">
+    <value>Do not preload user images</value>
+  </data>
+  <data name="userImagePreloadType_Icons" xml:space="preserve">
+    <value>48x48 (recommended)</value>
+  </data>
+  <data name="userImagePreloadType_FullSized" xml:space="preserve">
+    <value>48x48 + 256x256</value>
+  </data>
+</root>

src/Services/ImagePreloadService.cs

@@ -0,0 +1,33 @@
+using Berufsschule_HAM.Models;
+using Berufsschule_HAM.Helpers;
+
+namespace Berufsschule_HAM.Services;
+
+public class ImagePreloadService : IHostedService
+{
+    private readonly LdapService _ldap;
+    private readonly ILogger<HomeController> _logger;
+    public ImagePreloadService(LdapService ldap, ILogger<HomeController> logger)
+    {
+        _ldap = ldap ?? throw new ArgumentNullException(nameof(ldap));
+        _logger = logger;
+    }
+
+    public Task StartAsync(CancellationToken cancellationToken)
+    {
+        AdminSettingsModel adminSettingsModel = _ldap.GetAdminSettingsModelAsync().Result;
+
+        if (adminSettingsModel.UserImagePreloadType is not null && adminSettingsModel.UserImagePreloadType != UserImagePreloadType.None)
+        {
+            IEnumerable<UserModel> users = _ldap.ListUsersAsync().Result;
+            _logger.LogTrace("Preloading user images");
+            return ImageHelper.PreloadUsers(users, adminSettingsModel.UserImagePreloadType);
+        }
+        return Task.CompletedTask;
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+}

src/Views/Settings/Admin.cshtml

@@ -56,6 +56,15 @@
             <label class="form-label" for="updateMaxDownloadableUserImageSize">@T["Max downloadable user image size"]</label>
             <input type="number" id="updateMaxDownloadableUserImageSize" name="MaxDownloadableUserImageSize" class="form-control" value="@Model.MaxDownloadableUserImageSize" />
         </div>
+        <div class="col-md-6">
+            <label class="form-label" for="updateUserImagePreloadType">@T["User image preloading"]</label>
+            <select type="text" name="UserImagePreloadType" id="updateUserImagePreloadType" class="form-control" />
+                @foreach (UserImagePreloadType userImagePreloadType in Enum.GetValues(typeof(UserImagePreloadType)))
+                {
+                    <option selected="@(Model.UserImagePreloadType == userImagePreloadType)" value="@userImagePreloadType">@T["userImagePreloadType_" + userImagePreloadType.ToString()]</option>
+                }
+            </select>
+        </div>
     </div>
     <div class="mt-3 p-2 bg border rounded d-flex justify-content-between align-items-center"
         data-bs-toggle="collapse"