Release v44.0

Closes #165

app/.idea/.idea.DiscordHistoryTracker/.idea/codeStyles/Project.xml

@@ -13,10 +13,10 @@
     <CssCodeStyleSettings>
       <option name="HEX_COLOR_LOWER_CASE" value="true" />
     </CssCodeStyleSettings>
-    <DB2CodeStyleSettings version="6">
+    <DB2CodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </DB2CodeStyleSettings>
-    <DerbyCodeStyleSettings version="6">
+    <DerbyCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </DerbyCodeStyleSettings>
     <GoCodeStyleSettings>
@@ -26,10 +26,10 @@
       <option name="WRAP_FUNC_PARAMS" value="5" />
       <option name="WRAP_FUNC_RESULT" value="5" />
     </GoCodeStyleSettings>
-    <H2CodeStyleSettings version="6">
+    <H2CodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </H2CodeStyleSettings>
-    <HSQLCodeStyleSettings version="6">
+    <HSQLCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </HSQLCodeStyleSettings>
     <HTMLCodeStyleSettings>
@@ -85,10 +85,10 @@
     <LessCodeStyleSettings>
       <option name="HEX_COLOR_LOWER_CASE" value="true" />
     </LessCodeStyleSettings>
-    <MSSQLCodeStyleSettings version="6">
+    <MSSQLCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </MSSQLCodeStyleSettings>
-    <MySQLCodeStyleSettings version="6">
+    <MySQLCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </MySQLCodeStyleSettings>
     <Objective-C>
@@ -98,7 +98,7 @@
       <option name="SPACE_BEFORE_INIT_LIST" value="true" />
       <option name="SPACE_AFTER_DICTIONARY_LITERAL_COLON" value="false" />
     </Objective-C>
-    <OracleCodeStyleSettings version="6">
+    <OracleCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </OracleCodeStyleSettings>
     <PHPCodeStyleSettings>
@@ -116,7 +116,7 @@
       <option name="NEW_LINE_AFTER_PHP_OPENING_TAG" value="true" />
       <option name="SPACE_AROUND_ASSIGNMENT_IN_DECLARE" value="true" />
     </PHPCodeStyleSettings>
-    <PostgresCodeStyleSettings version="6">
+    <PostgresCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </PostgresCodeStyleSettings>
     <Properties>
@@ -143,13 +143,16 @@
       <option name="INDENT_WHEN_CASES" value="true" />
       <option name="CHAIN_CALLS_ALIGNMENT" value="2" />
     </Ruby>
-    <SQLiteCodeStyleSettings version="6">
+    <SQLiteCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </SQLiteCodeStyleSettings>
     <ScssCodeStyleSettings>
       <option name="HEX_COLOR_LOWER_CASE" value="true" />
     </ScssCodeStyleSettings>
-    <SqlCodeStyleSettings version="6">
+    <Shell_Script>
+      <option name="KEEP_COLUMN_ALIGNMENT_PADDING" value="true" />
+    </Shell_Script>
+    <SqlCodeStyleSettings version="7">
       <option name="KEYWORD_CASE" value="2" />
       <option name="TYPE_CASE" value="2" />
       <option name="CUSTOM_TYPE_CASE" value="2" />
@@ -173,9 +176,10 @@
       <option name="CONSTRAINT_WRAP_3" value="true" />
       <option name="CONSTRAINT_WRAP_4" value="true" />
       <option name="VIEW_INDENT_QUERY" value="true" />
+      <option name="IMP_LOOP_LOOP_INDENT" value="false" />
       <option name="EXPR_CASE_WHEN_WRAP" value="false" />
     </SqlCodeStyleSettings>
-    <SybaseCodeStyleSettings version="6">
+    <SybaseCodeStyleSettings version="7">
       <option name="USE_GENERIC_STYLE" value="true" />
     </SybaseCodeStyleSettings>
     <TypeScriptCodeStyleSettings version="0">
@@ -203,6 +207,11 @@
         <option name="KEEP_INDENTS_ON_EMPTY_LINES" value="true" />
       </indentOptions>
     </codeStyleSettings>
+    <codeStyleSettings language="Gherkin">
+      <indentOptions>
+        <option name="KEEP_INDENTS_ON_EMPTY_LINES" value="true" />
+      </indentOptions>
+    </codeStyleSettings>
     <codeStyleSettings language="Groovy">
       <option name="ELSE_ON_NEW_LINE" value="true" />
       <option name="SPACE_WITHIN_ARRAY_INITIALIZER_BRACES" value="true" />
@@ -282,6 +291,13 @@
         <option name="KEEP_INDENTS_ON_EMPTY_LINES" value="true" />
       </indentOptions>
     </codeStyleSettings>
+    <codeStyleSettings language="Markdown">
+      <indentOptions>
+        <option name="INDENT_SIZE" value="2" />
+        <option name="CONTINUATION_INDENT_SIZE" value="2" />
+        <option name="TAB_SIZE" value="2" />
+      </indentOptions>
+    </codeStyleSettings>
     <codeStyleSettings language="ObjectiveC">
       <option name="LINE_COMMENT_AT_FIRST_COLUMN" value="false" />
       <option name="BLOCK_COMMENT_AT_FIRST_COLUMN" value="false" />
@@ -342,7 +358,6 @@
       </indentOptions>
     </codeStyleSettings>
     <codeStyleSettings language="Rust">
-      <option name="RIGHT_MARGIN" value="140" />
       <option name="ALIGN_MULTILINE_CHAINED_METHODS" value="true" />
       <indentOptions>
         <option name="USE_TAB_CHARACTER" value="true" />
@@ -357,6 +372,7 @@
     </codeStyleSettings>
     <codeStyleSettings language="SCSS">
       <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="2" />
         <option name="KEEP_INDENTS_ON_EMPTY_LINES" value="true" />
       </indentOptions>
     </codeStyleSettings>
@@ -367,13 +383,6 @@
         <option name="KEEP_INDENTS_ON_EMPTY_LINES" value="true" />
       </indentOptions>
     </codeStyleSettings>
-    <codeStyleSettings language="Shell Script">
-      <indentOptions>
-        <option name="INDENT_SIZE" value="4" />
-        <option name="TAB_SIZE" value="4" />
-        <option name="USE_TAB_CHARACTER" value="true" />
-      </indentOptions>
-    </codeStyleSettings>
     <codeStyleSettings language="TOML">
       <indentOptions>
         <option name="CONTINUATION_INDENT_SIZE" value="4" />
@@ -427,6 +436,9 @@
     </codeStyleSettings>
     <codeStyleSettings language="liquid">
       <indentOptions>
+        <option name="INDENT_SIZE" value="2" />
+        <option name="CONTINUATION_INDENT_SIZE" value="2" />
+        <option name="TAB_SIZE" value="2" />
         <option name="KEEP_INDENTS_ON_EMPTY_LINES" value="true" />
       </indentOptions>
     </codeStyleSettings>
@@ -442,4 +454,4 @@
       </indentOptions>
     </codeStyleSettings>
   </code_scheme>
-</component>
+</component>

app/.idea/.idea.DiscordHistoryTracker/.idea/inspectionProfiles/Project.xml

@@ -91,7 +91,6 @@
     <inspection_tool class="ComparatorNotSerializable" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="CompareToUsesNonFinalVariable" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="ComparisonOfShortAndChar" enabled="true" level="WARNING" enabled_by_default="true" />
-    <inspection_tool class="ComposeMissingKeys" enabled="true" level="ERROR" enabled_by_default="true" />
     <inspection_tool class="ConditionSignal" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="ConditionalExpression" enabled="true" level="INFORMATION" enabled_by_default="true">
       <option name="ignoreSimpleAssignmentsAndReturns" value="true" />
@@ -362,7 +361,7 @@
     </inspection_tool>
     <inspection_tool class="LocalVariableDeclarationSideOnly" enabled="true" level="ERROR" enabled_by_default="true" />
     <inspection_tool class="LocalVariableNamingConventionJS" enabled="true" level="WARNING" enabled_by_default="true">
-      <option name="m_regex" value="[a-z][A-Za-z]*" />
+      <option name="m_regex" value="[a-z][A-Za-z0-9]*" />
       <option name="m_minLength" value="0" />
       <option name="m_maxLength" value="99" />
     </inspection_tool>

app/.idea/.idea.DiscordHistoryTracker/.idea/libraries/Generated_files.xml

@@ -1,22 +0,0 @@
-<component name="libraryTable">
-  <library name="Generated files" type="javaScript">
-    <properties>
-      <sourceFilesUrls>
-        <item url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/discord.js" />
-        <item url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/dom.js" />
-        <item url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/gui.js" />
-        <item url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/settings.js" />
-        <item url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/state.js" />
-      </sourceFilesUrls>
-    </properties>
-    <CLASSES>
-      <root url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/discord.js" />
-      <root url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/dom.js" />
-      <root url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/gui.js" />
-      <root url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/settings.js" />
-      <root url="file://$PROJECT_DIR$/Resources/Tracker/scripts.min/state.js" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

app/Desktop/Arguments.cs

@@ -15,6 +15,7 @@ sealed class Arguments {
 	public string? DatabaseFile { get; }
 	public ushort? ServerPort { get; }
 	public string? ServerToken { get; }
+	public byte? ConcurrentDownloads { get; }
 
 	public Arguments(IReadOnlyList<string> args) {
 		for (int i = FirstArgument; i < args.Count; i++) {
@@ -50,11 +51,11 @@ sealed class Arguments {
 					continue;
 
 				case "-port": {
-					if (ushort.TryParse(value, out var port)) {
-						ServerPort = port;
+					if (!ushort.TryParse(value, out var port)) {
+						Log.Warn("Invalid port number: " + value);
 					}
 					else {
-						Log.Warn("Invalid port number: " + value);
+						ServerPort = port;
 					}
 
 					continue;
@@ -63,6 +64,20 @@ sealed class Arguments {
 				case "-token":
 					ServerToken = value;
 					continue;
+				
+				case "-concurrentdownloads":
+					if (!ulong.TryParse(value, out var concurrentDownloads) || concurrentDownloads == 0) {
+						Log.Warn("Invalid concurrent downloads count: " + value);
+					}
+					else if (concurrentDownloads > 10) {
+						Log.Warn("Limiting concurrent downloads to 10");
+						ConcurrentDownloads = 10;
+					}
+					else {
+						ConcurrentDownloads = (byte) concurrentDownloads;
+					}
+					
+					continue;
 
 				default:
 					Log.Warn("Unknown command line argument: " + key);

app/Desktop/Common/SystemUtils.cs

@@ -0,0 +1,9 @@
+using System.Diagnostics;
+
+namespace DHT.Desktop.Common;
+
+static class SystemUtils {
+	public static void OpenUrl(string url) {
+		Process.Start(new ProcessStartInfo(url) { UseShellExecute = true });
+	}
+}

app/Desktop/Desktop.csproj

@@ -15,14 +15,14 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.6" Condition=" '$(Configuration)' == 'Debug' " />
-    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.6" />
-    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.6" />
+    <PackageReference Include="Avalonia" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.11" Condition=" '$(Configuration)' == 'Debug' " />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.11" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.11" />
     <PackageReference Include="CommunityToolkit.Mvvm" Version="999.0.0-build.0.g0d941a6a62" />
   </ItemGroup>
   
@@ -39,11 +39,6 @@
     <EmbeddedResource Include="Resources/tracker-loader.js">
       <LogicalName>tracker-loader.js</LogicalName>
     </EmbeddedResource>
-    <EmbeddedResource Include="../Resources/Viewer/**">
-      <LogicalName>Viewer\%(RecursiveDir)%(Filename)%(Extension)</LogicalName>
-      <Link>Resources/Viewer/%(RecursiveDir)%(Filename)%(Extension)</Link>
-      <Visible>false</Visible>
-    </EmbeddedResource>
   </ItemGroup>
   
 </Project>

app/Desktop/Main/AboutWindow.axaml

@@ -3,12 +3,12 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:main="clr-namespace:DHT.Desktop.Main"
-        mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="295"
+        mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="360"
         x:Class="DHT.Desktop.Main.AboutWindow"
         x:DataType="main:AboutWindowModel"
         Title="About Discord History Tracker"
         Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
-        Width="480" Height="295" CanResize="False"
+        Width="480" Height="360" CanResize="False"
         WindowStartupLocation="CenterOwner">
 
     <Design.DataContext>
@@ -39,10 +39,11 @@
 
         <StackPanel>
             <Button Command="{Binding ShowOfficialWebsite}">Official Website</Button>
+            <Button Command="{Binding ShowIssueTracker}">Issue Tracker</Button>
             <Button Command="{Binding ShowSourceCode}">Source Code</Button>
         </StackPanel>
 
-        <Grid RowDefinitions="Auto,5,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="175,125,*" Margin="0 10 0 0">
+        <Grid RowDefinitions="Auto,5,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="175,125,*" Margin="0 10 0 0">
             <TextBlock Grid.Row="0" Grid.Column="0" FontWeight="Bold">Third-Party Software</TextBlock>
             <TextBlock Grid.Row="0" Grid.Column="1" FontWeight="Bold">License</TextBlock>
             <TextBlock Grid.Row="0" Grid.Column="2" FontWeight="Bold">Link</TextBlock>
@@ -55,13 +56,21 @@
             <TextBlock Grid.Row="3" Grid.Column="1">MIT</TextBlock>
             <Button Grid.Row="3" Grid.Column="2" Command="{Binding ShowLibraryAvalonia}">NuGet</Button>
 
-            <TextBlock Grid.Row="4" Grid.Column="0">SQLite</TextBlock>
-            <TextBlock Grid.Row="4" Grid.Column="1">Public Domain</TextBlock>
-            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibrarySqlite}">Official Website</Button>
+            <TextBlock Grid.Row="4" Grid.Column="0">MVVM Toolkit</TextBlock>
+            <TextBlock Grid.Row="4" Grid.Column="1">MIT</TextBlock>
+            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibraryCommunityToolkit}">GitHub</Button>
+            
+            <TextBlock Grid.Row="5" Grid.Column="0">SQLite</TextBlock>
+            <TextBlock Grid.Row="5" Grid.Column="1">Public Domain</TextBlock>
+            <Button Grid.Row="5" Grid.Column="2" Command="{Binding ShowLibrarySqlite}">Official Website</Button>
 
-            <TextBlock Grid.Row="5" Grid.Column="0">Microsoft.Data.Sqlite</TextBlock>
-            <TextBlock Grid.Row="5" Grid.Column="1">Apache-2.0</TextBlock>
-            <Button Grid.Row="5" Grid.Column="2" Command="{Binding ShowLibrarySqliteAdoNet}">NuGet</Button>
+            <TextBlock Grid.Row="6" Grid.Column="0">Microsoft.Data.Sqlite</TextBlock>
+            <TextBlock Grid.Row="6" Grid.Column="1">Apache-2.0</TextBlock>
+            <Button Grid.Row="6" Grid.Column="2" Command="{Binding ShowLibrarySqliteAdoNet}">NuGet</Button>
+            
+            <TextBlock Grid.Row="7" Grid.Column="0">Rx.NET</TextBlock>
+            <TextBlock Grid.Row="7" Grid.Column="1">MIT</TextBlock>
+            <Button Grid.Row="7" Grid.Column="2" Command="{Binding ShowLibraryRxNet}">GitHub</Button>
         </Grid>
 
     </StackPanel>

app/Desktop/Main/AboutWindowModel.cs

@@ -1,33 +1,41 @@
-using System.Diagnostics;
+using DHT.Desktop.Common;
 
 namespace DHT.Desktop.Main;
 
 sealed class AboutWindowModel {
 	public void ShowOfficialWebsite() {
-		OpenUrl("https://dht.chylex.com");
+		SystemUtils.OpenUrl(Program.Website);
 	}
 
+	public void ShowIssueTracker() {
+		SystemUtils.OpenUrl("https://github.com/chylex/Discord-History-Tracker/issues");
+	}
+	
 	public void ShowSourceCode() {
-		OpenUrl("https://github.com/chylex/Discord-History-Tracker");
-	}
-
-	public void ShowLibraryAvalonia() {
-		OpenUrl("https://www.nuget.org/packages/Avalonia");
-	}
-
-	public void ShowLibrarySqlite() {
-		OpenUrl("https://www.sqlite.org");
-	}
-
-	public void ShowLibrarySqliteAdoNet() {
-		OpenUrl("https://www.nuget.org/packages/Microsoft.Data.Sqlite");
+		SystemUtils.OpenUrl("https://github.com/chylex/Discord-History-Tracker");
 	}
 
 	public void ShowLibraryNetCore() {
-		OpenUrl("https://github.com/dotnet/core");
+		SystemUtils.OpenUrl("https://github.com/dotnet/core");
 	}
 
-	private static void OpenUrl(string url) {
-		Process.Start(new ProcessStartInfo { FileName = url, UseShellExecute = true });
+	public void ShowLibraryAvalonia() {
+		SystemUtils.OpenUrl("https://www.nuget.org/packages/Avalonia");
+	}
+
+	public void ShowLibraryCommunityToolkit() {
+		SystemUtils.OpenUrl("https://github.com/CommunityToolkit/dotnet");
+	}
+
+	public void ShowLibrarySqlite() {
+		SystemUtils.OpenUrl("https://www.sqlite.org");
+	}
+
+	public void ShowLibrarySqliteAdoNet() {
+		SystemUtils.OpenUrl("https://www.nuget.org/packages/Microsoft.Data.Sqlite");
+	}
+
+	public void ShowLibraryRxNet() {
+		SystemUtils.OpenUrl("https://github.com/dotnet/reactive");
 	}
 }

app/Desktop/Main/Controls/DownloadItemFilterPanelModel.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Linq;
 using System.Reactive.Linq;
 using System.Threading.Tasks;
 using Avalonia.ReactiveUI;
@@ -8,13 +9,17 @@ using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
 using DHT.Server;
 using DHT.Server.Data.Filters;
+using DHT.Server.Data.Settings;
+using DHT.Utils.Logging;
 using DHT.Utils.Tasks;
 
 namespace DHT.Desktop.Main.Controls;
 
-sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposable {
+sealed partial class DownloadItemFilterPanelModel : ObservableObject, IAsyncDisposable {
+	private static readonly Log Log = Log.ForType<DownloadItemFilterPanelModel>();
+	
 	public sealed record Unit(string Name, uint Scale);
-
+	
 	private static readonly Unit[] AllUnits = [
 		new Unit("B", 1),
 		new Unit("kB", 1024),
@@ -33,7 +38,7 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 	private bool limitSize = false;
 	
 	[ObservableProperty]
-	private ulong maximumSize = 0L;
+	private ulong maximumSize = 0UL;
 	
 	[ObservableProperty]
 	private Unit maximumSizeUnit = AllUnits[0];
@@ -43,6 +48,9 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 	private readonly State state;
 	private readonly string verb;
 
+	private readonly DelayedThrottledTask<FilterSettings> saveFilterSettingsTask;
+	private bool isLoadingFilterSettings;
+
 	private readonly RestartableTask<long> downloadItemCountTask;
 	private long? matchingItemCount;
 	
@@ -56,6 +64,8 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 		this.state = state;
 		this.verb = verb;
 
+		this.saveFilterSettingsTask = new DelayedThrottledTask<FilterSettings>(Log, TimeSpan.FromSeconds(5), SaveFilterSettings);
+
 		this.downloadItemCountTask = new RestartableTask<long>(SetMatchingCount, TaskScheduler.FromCurrentSynchronizationContext());
 		this.downloadItemCountSubscription = state.Db.Downloads.TotalCount.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnDownloadItemCountChanged);
 
@@ -64,13 +74,51 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 		PropertyChanged += OnPropertyChanged;
 	}
 
-	public void Dispose() {
+	public async Task Initialize() {
+		isLoadingFilterSettings = true;
+		
+		LimitSize = await state.Db.Settings.Get(SettingsKey.DownloadsLimitSize, LimitSize);
+		MaximumSize = await state.Db.Settings.Get(SettingsKey.DownloadsMaximumSize, MaximumSize);
+
+		if (await state.Db.Settings.Get(SettingsKey.DownloadsMaximumSizeUnit, null) is {} unitName && AllUnits.FirstOrDefault(unit => unit.Name == unitName) is {} unitValue) {
+			MaximumSizeUnit = unitValue;
+		}
+		
+		isLoadingFilterSettings = false;
+	}
+
+	public async ValueTask DisposeAsync() {
+		saveFilterSettingsTask.Dispose();
+		
 		downloadItemCountTask.Cancel();
 		downloadItemCountSubscription.Dispose();
+		
+		await SaveFilterSettings(new FilterSettings(this));
+	}
+	
+	private sealed record FilterSettings(bool LimitSize, ulong MaximumSize, Unit MaximumSizeUnit) {
+		public FilterSettings(DownloadItemFilterPanelModel model) : this(model.LimitSize, model.MaximumSize, model.MaximumSizeUnit) {}
+	}
+	
+	private async Task SaveFilterSettings(FilterSettings settings) {
+		try {
+			await state.Db.Settings.Set(async setter => {
+				await setter.Set(SettingsKey.DownloadsLimitSize, settings.LimitSize);
+				await setter.Set(SettingsKey.DownloadsMaximumSize, settings.MaximumSize);
+				await setter.Set(SettingsKey.DownloadsMaximumSizeUnit, settings.MaximumSizeUnit.Name);
+			});
+		} catch (Exception e) {
+			Log.Error("Could not save download filter settings");
+			Log.Error(e);
+		}
 	}
 
 	private void OnPropertyChanged(object? sender, PropertyChangedEventArgs e) {
 		if (e.PropertyName != null && FilterProperties.Contains(e.PropertyName)) {
+			if (!isLoadingFilterSettings) {
+				saveFilterSettingsTask.Post(new FilterSettings(this));
+			}
+			
 			UpdateFilterStatistics();
 		}
 	}

app/Desktop/Main/Controls/MessageFilterPanelModel.cs

@@ -249,11 +249,8 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 			var checkBoxItems = new List<CheckBoxItem<ulong>>();
 
 			await foreach (var user in state.Db.Users.Get()) {
-				var name = user.Name;
-				var discriminator = user.Discriminator;
-
 				checkBoxItems.Add(new CheckBoxItem<ulong>(user.Id) {
-					Title = discriminator == null ? name : name + " #" + discriminator,
+					Title = user.DisplayName == null ? user.Name : $"{user.DisplayName} ({user.Name})",
 					IsChecked = IncludedUsers == null || IncludedUsers.Contains(user.Id)
 				});
 			}

app/Desktop/Main/MainWindow.axaml.cs

@@ -1,9 +1,7 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
-using System.IO;
 using System.Threading.Tasks;
 using Avalonia.Controls;
-using DHT.Desktop.Main.Pages;
 using DHT.Utils.Logging;
 using JetBrains.Annotations;
 
@@ -43,13 +41,5 @@ public sealed partial class MainWindow : Window {
 				Log.Error("Caught exception while disposing window: " + ex);
 			}
 		}
-
-		foreach (var temporaryFile in ViewerPageModel.TemporaryFiles) {
-			try {
-				File.Delete(temporaryFile);
-			} catch (Exception) {
-				// ignored
-			}
-		}
 	}
 }

app/Desktop/Main/MainWindowModel.cs

@@ -30,6 +30,7 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 	private MainContentScreenModel? mainContentScreenModel;
 
 	private readonly Window window;
+	private readonly int? concurrentDownloads;
 
 	private State? state;
 
@@ -73,6 +74,8 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 		if (args.ServerToken != null) {
 			ServerConfiguration.Token = args.ServerToken;
 		}
+		
+		concurrentDownloads = args.ConcurrentDownloads;
 	}
 
 	private async void OnDatabaseSelected(object? sender, IDatabaseFile db) {
@@ -80,7 +83,7 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 		
 		await DisposeState();
 		
-		state = new State(db);
+		state = new State(db, concurrentDownloads);
 
 		try {
 			await state.Server.Start(ServerConfiguration.Port, ServerConfiguration.Token);
@@ -92,6 +95,8 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 		mainContentScreenModel = new MainContentScreenModel(window, state);
 		mainContentScreenModel.DatabaseClosed += MainContentScreenModelOnDatabaseClosed;
 		
+		await mainContentScreenModel.Initialize();
+		
 		Title = Path.GetFileName(state.Db.Path) + " - " + DefaultTitle;
 		CurrentScreen = new MainContentScreen { DataContext = mainContentScreenModel };
 
@@ -101,7 +106,7 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 	private async void MainContentScreenModelOnDatabaseClosed(object? sender, EventArgs e) {
 		if (mainContentScreenModel != null) {
 			mainContentScreenModel.DatabaseClosed -= MainContentScreenModelOnDatabaseClosed;
-			mainContentScreenModel.Dispose();
+			await mainContentScreenModel.DisposeAsync();
 			mainContentScreenModel = null;
 		}
 
@@ -121,7 +126,10 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 	}
 
 	public async ValueTask DisposeAsync() {
-		mainContentScreenModel?.Dispose();
+		if (mainContentScreenModel != null) {
+			await mainContentScreenModel.DisposeAsync();
+		}
+		
 		await DisposeState();
 	}
 }

app/Desktop/Main/Pages/DebugPageModel.cs

@@ -10,164 +10,165 @@ using DHT.Server;
 using DHT.Server.Data;
 using DHT.Server.Service;
 
-namespace DHT.Desktop.Main.Pages {
-	sealed class DebugPageModel {
-		public string GenerateChannels { get; set; } = "0";
-		public string GenerateUsers { get; set; } = "0";
-		public string GenerateMessages { get; set; } = "0";
+namespace DHT.Desktop.Main.Pages;
 
-		private readonly Window window;
-		private readonly State state;
+sealed class DebugPageModel {
+	public string GenerateChannels { get; set; } = "0";
+	public string GenerateUsers { get; set; } = "0";
+	public string GenerateMessages { get; set; } = "0";
 
-		[Obsolete("Designer")]
-		public DebugPageModel() : this(null!, State.Dummy) {}
+	private readonly Window window;
+	private readonly State state;
 
-		public DebugPageModel(Window window, State state) {
-			this.window = window;
-			this.state = state;
+	[Obsolete("Designer")]
+	public DebugPageModel() : this(null!, State.Dummy) {}
+
+	public DebugPageModel(Window window, State state) {
+		this.window = window;
+		this.state = state;
+	}
+
+	public async void OnClickAddRandomDataToDatabase() {
+		if (!int.TryParse(GenerateChannels, out int channels) || channels < 1) {
+			await Dialog.ShowOk(window, "Generate Random Data", "Amount of channels must be at least 1!");
+			return;
 		}
 
-		public async void OnClickAddRandomDataToDatabase() {
-			if (!int.TryParse(GenerateChannels, out int channels) || channels < 1) {
-				await Dialog.ShowOk(window, "Generate Random Data", "Amount of channels must be at least 1!");
-				return;
-			}
-
-			if (!int.TryParse(GenerateUsers, out int users) || users < 1) {
-				await Dialog.ShowOk(window, "Generate Random Data", "Amount of users must be at least 1!");
-				return;
-			}
-
-			if (!int.TryParse(GenerateMessages, out int messages) || messages < 1) {
-				await Dialog.ShowOk(window, "Generate Random Data", "Amount of messages must be at least 1!");
-				return;
-			}
-
-			await ProgressDialog.Show(window, "Generating Random Data", async (_, callback) => await GenerateRandomData(channels, users, messages, callback));
+		if (!int.TryParse(GenerateUsers, out int users) || users < 1) {
+			await Dialog.ShowOk(window, "Generate Random Data", "Amount of users must be at least 1!");
+			return;
 		}
 
-		private const int BatchSize = 500;
+		if (!int.TryParse(GenerateMessages, out int messages) || messages < 1) {
+			await Dialog.ShowOk(window, "Generate Random Data", "Amount of messages must be at least 1!");
+			return;
+		}
 
-		private async Task GenerateRandomData(int channelCount, int userCount, int messageCount, IProgressCallback callback) {
-			int batchCount = (messageCount + BatchSize - 1) / BatchSize;
-			await callback.Update("Adding messages in batches of " + BatchSize, 0, batchCount);
+		await ProgressDialog.Show(window, "Generating Random Data", async (_, callback) => await GenerateRandomData(channels, users, messages, callback));
+	}
 
-			var rand = new Random();
-			var server = new DHT.Server.Data.Server {
-				Id = RandomId(rand),
-				Name = RandomName("s"),
-				Type = ServerType.Server,
-			};
+	private const int BatchSize = 500;
 
-			var channels = Enumerable.Range(0, channelCount).Select(i => new Channel {
-				Id = RandomId(rand),
-				Server = server.Id,
-				Name = RandomName("c"),
-				ParentId = null,
-				Position = i,
-				Topic = RandomText(rand, 10),
-				Nsfw = rand.Next(4) == 0,
+	private async Task GenerateRandomData(int channelCount, int userCount, int messageCount, IProgressCallback callback) {
+		int batchCount = (messageCount + BatchSize - 1) / BatchSize;
+		await callback.Update("Adding messages in batches of " + BatchSize, 0, batchCount);
+
+		var rand = new Random();
+		var server = new DHT.Server.Data.Server {
+			Id = RandomId(rand),
+			Name = RandomName("s"),
+			Type = ServerType.Server,
+		};
+
+		var channels = Enumerable.Range(0, channelCount).Select(i => new Channel {
+			Id = RandomId(rand),
+			Server = server.Id,
+			Name = RandomName("c"),
+			ParentId = null,
+			Position = i,
+			Topic = RandomText(rand, 10),
+			Nsfw = rand.Next(4) == 0,
+		}).ToArray();
+
+		var users = Enumerable.Range(0, userCount).Select(_ => new User {
+			Id = RandomId(rand),
+			Name = RandomName("u"),
+			DisplayName = RandomName("u"),
+			AvatarUrl = null,
+			Discriminator = rand.Next(0, 9999).ToString(),
+		}).ToArray();
+
+		await state.Db.Users.Add(users);
+		await state.Db.Servers.Add([server]);
+		await state.Db.Channels.Add(channels);
+
+		var now = DateTimeOffset.Now;
+		int batchIndex = 0;
+
+		while (messageCount > 0) {
+			int hourOffset = batchIndex;
+
+			var messages = Enumerable.Range(0, Math.Min(messageCount, BatchSize)).Select(i => {
+				DateTimeOffset time = now.AddHours(hourOffset).AddMinutes(i * 60.0 / BatchSize);
+				DateTimeOffset? edit = rand.Next(100) == 0 ? time.AddSeconds(rand.Next(1, 60)) : null;
+
+				var timeMillis = time.ToUnixTimeMilliseconds();
+				var editMillis = edit?.ToUnixTimeMilliseconds();
+
+				return new Message {
+					Id = (ulong) timeMillis,
+					Sender = RandomBiasedIndex(rand, users).Id,
+					Channel = RandomBiasedIndex(rand, channels).Id,
+					Text = RandomText(rand, 100),
+					Timestamp = timeMillis,
+					EditTimestamp = editMillis,
+					RepliedToId = null,
+					Attachments = ImmutableList<Attachment>.Empty,
+					Embeds = ImmutableList<Embed>.Empty,
+					Reactions = ImmutableList<Reaction>.Empty,
+				};
 			}).ToArray();
 
-			var users = Enumerable.Range(0, userCount).Select(_ => new User {
-				Id = RandomId(rand),
-				Name = RandomName("u"),
-				AvatarUrl = null,
-				Discriminator = rand.Next(0, 9999).ToString(),
-			}).ToArray();
+			await state.Db.Messages.Add(messages);
 
-			await state.Db.Users.Add(users);
-			await state.Db.Servers.Add([server]);
-			await state.Db.Channels.Add(channels);
-
-			var now = DateTimeOffset.Now;
-			int batchIndex = 0;
-
-			while (messageCount > 0) {
-				int hourOffset = batchIndex;
-
-				var messages = Enumerable.Range(0, Math.Min(messageCount, BatchSize)).Select(i => {
-					DateTimeOffset time = now.AddHours(hourOffset).AddMinutes(i * 60.0 / BatchSize);
-					DateTimeOffset? edit = rand.Next(100) == 0 ? time.AddSeconds(rand.Next(1, 60)) : null;
-
-					var timeMillis = time.ToUnixTimeMilliseconds();
-					var editMillis = edit?.ToUnixTimeMilliseconds();
-
-					return new Message {
-						Id = (ulong) timeMillis,
-						Sender = RandomBiasedIndex(rand, users).Id,
-						Channel = RandomBiasedIndex(rand, channels).Id,
-						Text = RandomText(rand, 100),
-						Timestamp = timeMillis,
-						EditTimestamp = editMillis,
-						RepliedToId = null,
-						Attachments = ImmutableList<Attachment>.Empty,
-						Embeds = ImmutableList<Embed>.Empty,
-						Reactions = ImmutableList<Reaction>.Empty,
-					};
-				}).ToArray();
-
-				await state.Db.Messages.Add(messages);
-
-				messageCount -= BatchSize;
-				await callback.Update("Adding messages in batches of " + BatchSize, ++batchIndex, batchCount);
-			}
+			messageCount -= BatchSize;
+			await callback.Update("Adding messages in batches of " + BatchSize, ++batchIndex, batchCount);
 		}
+	}
 
-		private static ulong RandomId(Random rand) {
-			ulong h = unchecked((ulong) rand.Next());
-			ulong l = unchecked((ulong) rand.Next());
-			return (h << 32) | l;
-		}
+	private static ulong RandomId(Random rand) {
+		ulong h = unchecked((ulong) rand.Next());
+		ulong l = unchecked((ulong) rand.Next());
+		return (h << 32) | l;
+	}
 
-		private static string RandomName(string prefix) {
-			return prefix + "-" + ServerUtils.GenerateRandomToken(5);
-		}
+	private static string RandomName(string prefix) {
+		return prefix + "-" + ServerUtils.GenerateRandomToken(5);
+	}
 
-		private static T RandomBiasedIndex<T>(Random rand, T[] options) {
-			return options[(int) Math.Floor(options.Length * rand.NextDouble() * rand.NextDouble())];
-		}
+	private static T RandomBiasedIndex<T>(Random rand, T[] options) {
+		return options[(int) Math.Floor(options.Length * rand.NextDouble() * rand.NextDouble())];
+	}
 
-		private static readonly string[] RandomWords = [
-			"apple", "apricot", "artichoke", "arugula", "asparagus", "avocado",
-			"banana", "bean", "beechnut", "beet", "blackberry", "blackcurrant", "blueberry", "boysenberry", "bramble", "broccoli",
-			"cabbage", "cacao", "cantaloupe", "caper", "carambola", "carrot", "cauliflower", "celery", "chard", "cherry", "chokeberry", "citron", "clementine", "coconut", "corn", "crabapple", "cranberry", "cucumber", "currant",
-			"daikon", "date", "dewberry", "durian",
-			"edamame", "eggplant", "elderberry", "endive",
-			"fig",
-			"garlic", "ginger", "gooseberry", "grape", "grapefruit", "guava",
-			"honeysuckle", "horseradish", "huckleberry",
-			"jackfruit", "jicama",
-			"kale", "kiwi", "kohlrabi", "kumquat",
-			"leek", "lemon", "lentil", "lettuce", "lime",
-			"mandarin", "mango", "mushroom", "myrtle",
-			"nectarine", "nut",
-			"olive", "okra", "onion", "orange",
-			"papaya", "parsnip", "pawpaw", "peach", "pear", "pea", "pepper", "persimmon", "pineapple", "plum", "plantain", "pomegranate", "pomelo", "potato", "prune", "pumpkin",
-			"quandong", "quinoa",
-			"radicchio", "radish", "raisin", "raspberry", "redcurrant", "rhubarb", "rutabaga",
-			"spinach", "strawberry", "squash",
-			"tamarind", "tangerine", "tomatillo", "tomato", "turnip",
-			"vanilla",
-			"watercress", "watermelon",
-			"yam",
-			"zucchini"
-		];
+	private static readonly string[] RandomWords = [
+		"apple", "apricot", "artichoke", "arugula", "asparagus", "avocado",
+		"banana", "bean", "beechnut", "beet", "blackberry", "blackcurrant", "blueberry", "boysenberry", "bramble", "broccoli",
+		"cabbage", "cacao", "cantaloupe", "caper", "carambola", "carrot", "cauliflower", "celery", "chard", "cherry", "chokeberry", "citron", "clementine", "coconut", "corn", "crabapple", "cranberry", "cucumber", "currant",
+		"daikon", "date", "dewberry", "durian",
+		"edamame", "eggplant", "elderberry", "endive",
+		"fig",
+		"garlic", "ginger", "gooseberry", "grape", "grapefruit", "guava",
+		"honeysuckle", "horseradish", "huckleberry",
+		"jackfruit", "jicama",
+		"kale", "kiwi", "kohlrabi", "kumquat",
+		"leek", "lemon", "lentil", "lettuce", "lime",
+		"mandarin", "mango", "mushroom", "myrtle",
+		"nectarine", "nut",
+		"olive", "okra", "onion", "orange",
+		"papaya", "parsnip", "pawpaw", "peach", "pear", "pea", "pepper", "persimmon", "pineapple", "plum", "plantain", "pomegranate", "pomelo", "potato", "prune", "pumpkin",
+		"quandong", "quinoa",
+		"radicchio", "radish", "raisin", "raspberry", "redcurrant", "rhubarb", "rutabaga",
+		"spinach", "strawberry", "squash",
+		"tamarind", "tangerine", "tomatillo", "tomato", "turnip",
+		"vanilla",
+		"watercress", "watermelon",
+		"yam",
+		"zucchini"
+	];
 
-		private static string RandomText(Random rand, int maxWords) {
-			int wordCount = 1 + (int) Math.Floor(maxWords * Math.Pow(rand.NextDouble(), 3));
-			return string.Join(' ', Enumerable.Range(0, wordCount).Select(_ => RandomWords[rand.Next(RandomWords.Length)]));
-		}
+	private static string RandomText(Random rand, int maxWords) {
+		int wordCount = 1 + (int) Math.Floor(maxWords * Math.Pow(rand.NextDouble(), 3));
+		return string.Join(' ', Enumerable.Range(0, wordCount).Select(_ => RandomWords[rand.Next(RandomWords.Length)]));
 	}
 }
 #else
-namespace DHT.Desktop.Main.Pages {
-	sealed class DebugPageModel {
-		public string GenerateChannels { get; set; } = "0";
-		public string GenerateUsers { get; set; } = "0";
-		public string GenerateMessages { get; set; } = "0";
+namespace DHT.Desktop.Main.Pages;
 
-		public void OnClickAddRandomDataToDatabase() {}
-	}
+sealed class DebugPageModel {
+	public string GenerateChannels { get; set; } = "0";
+	public string GenerateUsers { get; set; } = "0";
+	public string GenerateMessages { get; set; } = "0";
+
+	public void OnClickAddRandomDataToDatabase() {}
 }
 #endif

app/Desktop/Main/Pages/DownloadsPage.axaml

@@ -31,8 +31,14 @@
     </UserControl.Styles>
 
     <StackPanel Orientation="Vertical" Spacing="20">
-        <Button Command="{Binding OnClickToggleDownload}" Content="{Binding ToggleDownloadButtonText}" IsEnabled="{Binding IsToggleDownloadButtonEnabled}" />
+        <StackPanel Orientation="Horizontal" Spacing="10">
+            <Button Command="{Binding OnClickToggleDownload}" Content="{Binding ToggleDownloadButtonText}" IsEnabled="{Binding IsToggleDownloadButtonEnabled}" />
+            <Button Command="{Binding OnClickRetryFailedDownloads}" IsEnabled="{Binding IsRetryFailedOnDownloadsButtonEnabled}">Retry Failed Downloads</Button>
+        </StackPanel>
         <controls:DownloadItemFilterPanel DataContext="{Binding FilterModel}" IsEnabled="{Binding !$parent[UserControl].((pages:DownloadsPageModel)DataContext).IsDownloading}" />
+        <TextBlock TextWrapping="Wrap">
+            Downloading state and filter settings are remembered per-database.
+        </TextBlock>
         <StackPanel Orientation="Vertical" Spacing="12">
             <Expander Header="Download Status" IsExpanded="True">
                 <DataGrid ItemsSource="{Binding StatisticsRows}" AutoGenerateColumns="False" CanUserReorderColumns="False" CanUserResizeColumns="False" CanUserSortColumns="False" IsReadOnly="True">
@@ -43,9 +49,6 @@
                     </DataGrid.Columns>
                 </DataGrid>
             </Expander>
-            <StackPanel Orientation="Horizontal" Spacing="10">
-                <Button Command="{Binding OnClickRetryFailedDownloads}" IsEnabled="{Binding IsRetryFailedOnDownloadsButtonEnabled}">Retry Failed Downloads</Button>
-            </StackPanel>
         </StackPanel>
     </StackPanel>
 </UserControl>

app/Desktop/Main/Pages/DownloadsPageModel.cs

@@ -9,13 +9,14 @@ using DHT.Desktop.Main.Controls;
 using DHT.Server;
 using DHT.Server.Data.Aggregations;
 using DHT.Server.Data.Filters;
+using DHT.Server.Data.Settings;
 using DHT.Server.Download;
 using DHT.Utils.Logging;
 using DHT.Utils.Tasks;
 
 namespace DHT.Desktop.Main.Pages;
 
-sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
+sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	private static readonly Log Log = Log.ForType<DownloadsPageModel>();
 
 	[ObservableProperty(Setter = Access.Private)]
@@ -73,14 +74,22 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 
 		RecomputeDownloadStatistics();
 	}
+	
+	public async Task Initialize() {
+		await FilterModel.Initialize();
+		
+		if (await state.Db.Settings.Get(SettingsKey.DownloadsAutoStart, false)) {
+			await StartDownload();
+		}
+	}
 
-	public void Dispose() {
+	public async ValueTask DisposeAsync() {
 		finishedItemsSubscription?.Dispose();
 		
 		downloadItemCountSubscription.Dispose();
 		downloadStatisticsTask.Dispose();
 
-		FilterModel.Dispose();
+		await FilterModel.DisposeAsync();
 	}
 
 	private void OnDownloadCountChanged(long newDownloadCount) {
@@ -91,26 +100,41 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 		IsToggleDownloadButtonEnabled = false;
 
 		if (IsDownloading) {
-			await state.Downloader.Stop();
-			await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
-
-			finishedItemsSubscription?.Dispose();
-			finishedItemsSubscription = null;
-			
-			currentDownloadFilter = null;
+			await StopDownload();
 		}
 		else {
-			await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
-			
-			var finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
-			finishedItemsSubscription = finishedItems.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnItemFinished);
+			await StartDownload();
 		}
 
+		await state.Db.Settings.Set(SettingsKey.DownloadsAutoStart, IsDownloading);
+		IsToggleDownloadButtonEnabled = true;
+	}
+
+	private async Task StartDownload() {
+		await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
+		
+		var finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
+		finishedItemsSubscription = finishedItems.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnItemFinished);
+		
+		OnDownloadStateChanged();
+	}
+
+	private async Task StopDownload() {
+		await state.Downloader.Stop();
+		await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
+
+		finishedItemsSubscription?.Dispose();
+		finishedItemsSubscription = null;
+			
+		currentDownloadFilter = null;
+		OnDownloadStateChanged();
+	}
+
+	private void OnDownloadStateChanged() {
 		RecomputeDownloadStatistics();
 
 		OnPropertyChanged(nameof(ToggleDownloadButtonText));
 		OnPropertyChanged(nameof(IsDownloading));
-		IsToggleDownloadButtonEnabled = true;
 	}
 
 	private void OnItemFinished(DownloadItem item) {

app/Desktop/Main/Pages/ViewerPage.axaml

@@ -21,7 +21,6 @@
     <StackPanel Orientation="Vertical" Spacing="20">
         <StackPanel Orientation="Horizontal" VerticalAlignment="Top">
             <Button Command="{Binding OnClickOpenViewer}" Margin="0 0 5 0">Open Viewer</Button>
-            <Button Command="{Binding OnClickSaveViewer}" Margin="5 0 0 0">Save Viewer</Button>
         </StackPanel>
         <controls:MessageFilterPanel DataContext="{Binding FilterModel}" />
         <Expander Header="Database Tools">

app/Desktop/Main/Pages/ViewerPageModel.cs

@@ -1,34 +1,21 @@
 using System;
-using System.Collections.Concurrent;
 using System.ComponentModel;
-using System.Diagnostics;
-using System.IO;
-using System.Text;
 using System.Threading.Tasks;
 using System.Web;
 using Avalonia.Controls;
-using Avalonia.Platform.Storage;
 using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
-using DHT.Desktop.Dialogs.File;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Dialogs.Progress;
 using DHT.Desktop.Main.Controls;
 using DHT.Desktop.Server;
 using DHT.Server;
 using DHT.Server.Data.Filters;
-using DHT.Server.Database.Export;
-using static DHT.Desktop.Program;
+using DHT.Server.Service.Viewer;
 
 namespace DHT.Desktop.Main.Pages;
 
 sealed partial class ViewerPageModel : ObservableObject, IDisposable {
-	public static readonly ConcurrentBag<string> TemporaryFiles = [];
-
-	private static readonly FilePickerFileType[] ViewerFileTypes = [
-		FileDialogs.CreateFilter("Discord History Viewer", ["html"])
-	];
-
 	public bool DatabaseToolFilterModeKeep { get; set; } = true;
 	public bool DatabaseToolFilterModeRemove { get; set; } = false;
 
@@ -61,101 +48,15 @@ sealed partial class ViewerPageModel : ObservableObject, IDisposable {
 
 	public async void OnClickOpenViewer() {
 		try {
-			var fullPath = await PrepareTemporaryViewerFile();
-			
-			string jsConstants = $"""
-			                      window.DHT_SERVER_URL = "{HttpUtility.JavaScriptStringEncode("http://127.0.0.1:" + ServerConfiguration.Port)}";
-			                      window.DHT_SERVER_TOKEN = "{HttpUtility.JavaScriptStringEncode(ServerConfiguration.Token)}";
-			                      """;
-
-			await ProgressDialog.ShowIndeterminate(window, "Open Viewer", "Creating viewer...", _ => Task.Run(() => WriteViewerFile(fullPath, jsConstants)));
-			
-			Process.Start(new ProcessStartInfo(fullPath) {
-				UseShellExecute = true
-			});
+			string serverUrl = "http://127.0.0.1:" + ServerConfiguration.Port;
+			string serverToken = ServerConfiguration.Token;
+			string sessionId = state.ViewerSessions.Register(new ViewerSession(FilterModel.CreateFilter())).ToString();
+			SystemUtils.OpenUrl(serverUrl + "/viewer/?token=" + HttpUtility.UrlEncode(serverToken) + "&session=" + HttpUtility.UrlEncode(sessionId));
 		} catch (Exception e) {
-			await Dialog.ShowOk(window, "Open Viewer", "Could not create or save viewer: " + e.Message);
+			await Dialog.ShowOk(window, "Open Viewer", "Could not open viewer: " + e.Message);
 		}
 	}
 
-	private async Task<string> PrepareTemporaryViewerFile() {
-		return await Task.Run(() => {
-			string rootPath = Path.Combine(Path.GetTempPath(), "DiscordHistoryTracker");
-			string filenameBase = Path.GetFileNameWithoutExtension(state.Db.Path) + "-" + DateTime.Now.ToString("yyyy-MM-dd");
-			string fullPath = Path.Combine(rootPath, filenameBase + ".html");
-			
-			int counter = 0;
-
-			while (File.Exists(fullPath)) {
-				++counter;
-				fullPath = Path.Combine(rootPath, filenameBase + "-" + counter + ".html");
-			}
-
-			TemporaryFiles.Add(fullPath);
-
-			Directory.CreateDirectory(rootPath);
-
-			return fullPath;
-		});
-	}
-
-	public async void OnClickSaveViewer() {
-		string? path = await window.StorageProvider.SaveFile(new FilePickerSaveOptions {
-			Title = "Save Viewer",
-			FileTypeChoices = ViewerFileTypes,
-			SuggestedFileName = Path.GetFileNameWithoutExtension(state.Db.Path) + ".html",
-			SuggestedStartLocation = await FileDialogs.GetSuggestedStartLocation(window, Path.GetDirectoryName(state.Db.Path)),
-		});
-
-		if (path == null) {
-			return;
-		}
-
-		try {
-			await ProgressDialog.ShowIndeterminate(window, "Save Viewer", "Creating viewer...", _ => Task.Run(() => WriteViewerFile(path, string.Empty)));
-		} catch (Exception e) {
-			await Dialog.ShowOk(window, "Save Viewer", "Could not create or save viewer: " + e.Message);
-		}
-	}
-
-	private async Task WriteViewerFile(string path, string jsConstants) {
-		const string ArchiveTag = "/*[ARCHIVE]*/";
-
-		string indexFile = await Resources.ReadTextAsync("Viewer/index.html");
-		string viewerTemplate = indexFile.Replace("/*[CONSTANTS]*/", jsConstants)
-		                                 .Replace("/*[JS]*/", await Resources.ReadJoinedAsync("Viewer/scripts/", '\n'))
-		                                 .Replace("/*[CSS]*/", await Resources.ReadJoinedAsync("Viewer/styles/", '\n'));
-
-		int viewerArchiveTagStart = viewerTemplate.IndexOf(ArchiveTag);
-		int viewerArchiveTagEnd = viewerArchiveTagStart + ArchiveTag.Length;
-
-		string jsonTempFile = path + ".tmp";
-
-		await using (var jsonStream = new FileStream(jsonTempFile, FileMode.Create, FileAccess.ReadWrite, FileShare.Read)) {
-			await ViewerJsonExport.Generate(jsonStream, state.Db, FilterModel.CreateFilter());
-
-			char[] jsonBuffer = new char[Math.Min(32768, jsonStream.Position)];
-			jsonStream.Position = 0;
-
-			await using (var outputStream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
-			await using (var outputWriter = new StreamWriter(outputStream, Encoding.UTF8)) {
-				await outputWriter.WriteAsync(viewerTemplate[..viewerArchiveTagStart]);
-
-				using (var jsonReader = new StreamReader(jsonStream, Encoding.UTF8)) {
-					int readBytes;
-					while ((readBytes = await jsonReader.ReadAsync(jsonBuffer, 0, jsonBuffer.Length)) > 0) {
-						string jsonChunk = new string(jsonBuffer, 0, readBytes);
-						await outputWriter.WriteAsync(HttpUtility.JavaScriptStringEncode(jsonChunk));
-					}
-				}
-
-				await outputWriter.WriteAsync(viewerTemplate[viewerArchiveTagEnd..]);
-			}
-		}
-
-		File.Delete(jsonTempFile);
-	}
-
 	public async Task OnClickApplyFiltersToDatabase() {
 		var filter = FilterModel.CreateFilter();
 		var messageCount = await ProgressDialog.ShowIndeterminate(window, "Apply Filters", "Counting matching messages...", _ => state.Db.Messages.Count(filter));

app/Desktop/Main/Screens/MainContentScreenModel.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Avalonia.Controls;
 using DHT.Desktop.Main.Controls;
 using DHT.Desktop.Main.Pages;
@@ -6,7 +7,7 @@ using DHT.Server;
 
 namespace DHT.Desktop.Main.Screens;
 
-sealed class MainContentScreenModel : IDisposable {
+sealed class MainContentScreenModel : IAsyncDisposable {
 	public DatabasePage DatabasePage { get; }
 	private DatabasePageModel DatabasePageModel { get; }
 
@@ -70,9 +71,13 @@ sealed class MainContentScreenModel : IDisposable {
 
 		StatusBarModel = new StatusBarModel(state);
 	}
+	
+	public async Task Initialize() {
+		await DownloadsPageModel.Initialize();
+	}
 
-	public void Dispose() {
-		DownloadsPageModel.Dispose();
+	public async ValueTask DisposeAsync() {
+		await DownloadsPageModel.DisposeAsync();
 		ViewerPageModel.Dispose();
 		AdvancedPageModel.Dispose();
 		StatusBarModel.Dispose();

app/Desktop/Main/Screens/WelcomeScreen.axaml

@@ -22,20 +22,21 @@
             <Setter Property="HorizontalAlignment" Value="Center" />
             <Setter Property="VerticalAlignment" Value="Center" />
         </Style>
-        <Style Selector="Button">
-            <Setter Property="Margin" Value="5 0" />
+        <Style Selector="Grid#ButtonPanel > Button">
+            <Setter Property="HorizontalAlignment" Value="Stretch" />
         </Style>
     </UserControl.Styles>
 
     <Panel Name="RootPanel">
-        <StackPanel Margin="42">
-            <TextBlock Text="{Binding Version, StringFormat=Discord History Tracker v{0}}" FontSize="25" Margin="0 0 0 30" HorizontalAlignment="Center" />
-
-            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
-                <Button Command="{Binding OpenOrCreateDatabase}" IsEnabled="{Binding IsOpenOrCreateDatabaseButtonEnabled}">Open or Create Database</Button>
-                <Button Command="{Binding ShowAboutDialog}">About</Button>
-                <Button Command="{Binding Exit}">Exit</Button>
-            </StackPanel>
+        <StackPanel Margin="42 30">
+            <TextBlock Text="{Binding Version, StringFormat=Discord History Tracker v{0}}" FontSize="25" Margin="0 0 0 25" HorizontalAlignment="Center" />
+            
+            <Grid Name="ButtonPanel" RowDefinitions="Auto,12,Auto,12,Auto" ColumnDefinitions="*,12,*" Margin="12 0" HorizontalAlignment="Stretch">
+                <Button Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3" Command="{Binding OpenOrCreateDatabase}" IsEnabled="{Binding IsOpenOrCreateDatabaseButtonEnabled}">Open or Create Database</Button>
+                <Button Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="3" Command="{Binding CheckUpdates}">Check For Updates</Button>
+                <Button Grid.Row="4" Grid.Column="0" Command="{Binding ShowAboutDialog}">About</Button>
+                <Button Grid.Row="4" Grid.Column="2" Command="{Binding Exit}">Exit</Button>
+            </Grid>
         </StackPanel>
     </Panel>
 </UserControl>

app/Desktop/Main/Screens/WelcomeScreenModel.cs

@@ -1,25 +1,31 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Net;
+using System.Net.Http;
 using System.Threading.Tasks;
 using Avalonia.Controls;
 using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Dialogs.Progress;
+using DHT.Server.Data.Settings;
 using DHT.Server.Database;
 using DHT.Server.Database.Sqlite.Schema;
+using DHT.Utils.Logging;
 
 namespace DHT.Desktop.Main.Screens;
 
 sealed partial class WelcomeScreenModel : ObservableObject {
+	private static readonly Log Log = Log.ForType<WelcomeScreenModel>();
+
 	public string Version => Program.Version;
-	
+
 	[ObservableProperty(Setter = Access.Private)]
 	private bool isOpenOrCreateDatabaseButtonEnabled = true;
-	
-	public event EventHandler<IDatabaseFile>? DatabaseSelected; 
-	
+
+	public event EventHandler<IDatabaseFile>? DatabaseSelected;
+
 	private readonly Window window;
 
 	private string? dbFilePath;
@@ -45,20 +51,22 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 
 	public async Task OpenOrCreateDatabaseFromPath(string path) {
 		dbFilePath = path;
-		
+
+		bool isNew = !File.Exists(path);
+
 		var db = await DatabaseGui.TryOpenOrCreateDatabaseFromPath(path, window, new SchemaUpgradeCallbacks(window));
-		if (db != null) {
-			DatabaseSelected?.Invoke(this, db);
+		if (db == null) {
+			return;
 		}
+
+		if (isNew && await Dialog.ShowYesNo(window, "Automatic Downloads", "Do you want to automatically download files hosted on Discord? You can change this later in the Downloads tab.") == DialogResult.YesNo.Yes) {
+			await db.Settings.Set(SettingsKey.DownloadsAutoStart, true);
+		}
+
+		DatabaseSelected?.Invoke(this, db);
 	}
 
-	private sealed class SchemaUpgradeCallbacks : ISchemaUpgradeCallbacks {
-		private readonly Window window;
-		
-		public SchemaUpgradeCallbacks(Window window) {
-			this.window = window;
-		}
-
+	private sealed class SchemaUpgradeCallbacks(Window window) : ISchemaUpgradeCallbacks {
 		public async Task<bool> CanUpgrade() {
 			return DialogResult.YesNo.Yes == await DatabaseGui.ShowCanUpgradeDatabaseDialog(window);
 		}
@@ -71,20 +79,12 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 				await doUpgrade(reporter);
 				await Task.Delay(TimeSpan.FromMilliseconds(600));
 			}
-			
+
 			await new ProgressDialog { DataContext = new ProgressDialogModel("Upgrading Database", StartUpgrade, progressItems: 3) }.ShowProgressDialog(window);
 		}
 
-		private sealed class ProgressReporter : ISchemaUpgradeCallbacks.IProgressReporter {
-			private readonly IReadOnlyList<IProgressCallback> callbacks;
-			
-			private readonly int versionSteps;
+		private sealed class ProgressReporter(int versionSteps, IReadOnlyList<IProgressCallback> callbacks) : ISchemaUpgradeCallbacks.IProgressReporter {
 			private int versionProgress = 0;
-			
-			public ProgressReporter(int versionSteps, IReadOnlyList<IProgressCallback> callbacks) {
-				this.callbacks = callbacks;
-				this.versionSteps = versionSteps;
-			}
 
 			public async Task NextVersion() {
 				await callbacks[0].Update("Upgrading schema version...", versionProgress++, versionSteps);
@@ -109,6 +109,53 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 		}
 	}
 
+	public async Task CheckUpdates() {
+		Version? latestVersion = await ProgressDialog.ShowIndeterminate<Version?>(window, "Check Updates", "Checking for updates...", async _ => {
+			var client = new HttpClient(new SocketsHttpHandler {
+				AutomaticDecompression = DecompressionMethods.None,
+				AllowAutoRedirect = false,
+				UseCookies = false
+			});
+
+			client.Timeout = TimeSpan.FromSeconds(30);
+			client.MaxResponseContentBufferSize = 1024;
+			client.DefaultRequestHeaders.UserAgent.ParseAdd("DiscordHistoryTracker/" + Program.Version);
+
+			string response;
+			try {
+				response = await client.GetStringAsync(Program.Website + "/version");
+			} catch (TaskCanceledException e) when (e.InnerException is TimeoutException) {
+				await Dialog.ShowOk(window, "Check Updates", "Request timed out.");
+				return null;
+			} catch (Exception e) {
+				Log.Error(e);
+				await Dialog.ShowOk(window, "Check Updates", "Error checking for updates: " + e.Message);
+				return null;
+			}
+
+			if (!System.Version.TryParse(response, out var latestVersion)) {
+				await Dialog.ShowOk(window, "Check Updates", "Server returned an invalid response.");
+				return null;
+			}
+
+			return latestVersion;
+		});
+
+		if (latestVersion == null) {
+			return;
+		}
+		
+		if (Program.AssemblyVersion >= latestVersion) {
+			await Dialog.ShowOk(window, "Check Updates", "You are using the latest version.");
+			return;
+		}
+		
+		if (await Dialog.ShowYesNo(window, "Check Updates", "A newer version is available: v" + Program.VersionToString(latestVersion) + "\nVisit the official website and close the app?") == DialogResult.YesNo.Yes) {
+			SystemUtils.OpenUrl(Program.Website);
+			Exit();
+		}
+	}
+
 	public async Task ShowAboutDialog() {
 		await new AboutWindow { DataContext = new AboutWindowModel() }.ShowDialog(window);
 	}

app/Desktop/Program.cs

@@ -9,17 +9,18 @@ namespace DHT.Desktop;
 
 static class Program {
 	public static string Version { get; }
+	public static Version AssemblyVersion { get; }
 	public static CultureInfo Culture { get; }
 	public static ResourceLoader Resources { get; }
 	public static Arguments Arguments { get; }
 
+	public const string Website = "https://dht.chylex.com";
+	
 	static Program() {
 		var assembly = Assembly.GetExecutingAssembly();
 
-		Version = assembly.GetName().Version?.ToString() ?? "";
-		while (Version.EndsWith(".0")) {
-			Version = Version[..^2];
-		}
+		AssemblyVersion = assembly.GetName().Version ?? new Version(0, 0, 0, 0);
+		Version = VersionToString(AssemblyVersion);
 
 		Culture = CultureInfo.CurrentCulture;
 		CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
@@ -30,6 +31,16 @@ static class Program {
 		Resources = new ResourceLoader(assembly);
 		Arguments = new Arguments(Environment.GetCommandLineArgs());
 	}
+	
+	public static string VersionToString(Version version) {
+		string versionStr = version.ToString();
+		
+		while (versionStr.EndsWith(".0")) {
+			versionStr = versionStr[..^2];
+		}
+		
+		return versionStr;
+	}
 
 	public static void Main(string[] args) {
 		if (Arguments.Console && OperatingSystem.IsWindows()) {

app/Resources/Schemas/track-users.yml

@@ -9,6 +9,8 @@ items:
           pattern: "^[0-9]+$"
         name:
           type: string
+        displayName:
+          type: string
         avatar:
           type: string
         discriminator:

app/Resources/Tracker/bootstrap.js

@@ -10,11 +10,16 @@
 		return;
 	}
 	
+	/*[IMPORTS]*/
+	
+	if (!DISCORD.isCompatible()) {
+		alert("Discord History Tracker is not compatible with this version of Discord.");
+		return;
+	}
+	
 	window.DHT_LOADED = true;
 	window.DHT_ON_UNLOAD = [];
 	
-	/*[IMPORTS]*/
-	
 	const port = 0; /*[PORT]*/
 	const token = "/*[TOKEN]*/";
 	STATE.setup(port, token);
@@ -46,7 +51,7 @@
 		return action === null || action === CONSTANTS.AUTOSCROLL_ACTION_NOTHING;
 	};
 	
-	const onTrackingContinued = function(anyNewMessages) {
+	const onTrackingContinued = function(anyNewMessages, hasMoreBefore) {
 		if (!STATE.isTracking()) {
 			return;
 		}
@@ -63,7 +68,7 @@
 		if (SETTINGS.autoscroll) {
 			let action = null;
 			
-			if (!DISCORD.hasMoreMessages()) {
+			if (!hasMoreBefore) {
 				console.debug("[DHT] Reached first message.");
 				action = SETTINGS.afterFirstMsg;
 			}
@@ -84,7 +89,7 @@
 	
 	let waitUntilSendingFinishedTimer = null;
 	
-	const onMessagesUpdated = async messages => {
+	const onMessagesUpdated = async (server, channel, messages, hasMoreBefore) => {
 		if (!STATE.isTracking() || delayedStopRequests > 0) {
 			return;
 		}
@@ -94,24 +99,16 @@
 			
 			waitUntilSendingFinishedTimer = window.setTimeout(() => {
 				waitUntilSendingFinishedTimer = null;
-				onMessagesUpdated(messages);
+				onMessagesUpdated(server, channel, messages, hasMoreBefore);
 			}, 100);
 			
 			return;
 		}
 		
-		const info = DISCORD.getSelectedChannel();
-		
-		if (!info) {
-			GUI.setStatus("Error (Unknown Channel)");
-			stopTrackingDelayed();
-			return;
-		}
-		
 		isSending = true;
 		
 		try {
-			await STATE.addDiscordChannel(info.server, info.channel);
+			await STATE.addDiscordChannel(server, channel);
 		} catch (e) {
 			onError(e);
 			return;
@@ -120,35 +117,33 @@
 		try {
 			if (!messages.length) {
 				isSending = false;
-				onTrackingContinued(false);
+				onTrackingContinued(false, hasMoreBefore);
 			}
 			else {
 				const anyNewMessages = await STATE.addDiscordMessages(messages);
-				onTrackingContinued(anyNewMessages);
+				onTrackingContinued(anyNewMessages, hasMoreBefore);
 			}
 		} catch (e) {
 			onError(e);
 		}
 	};
 	
-	DISCORD.setupMessageCallback(onMessagesUpdated);
+	const starter = DISCORD.setupMessageCallback(onMessagesUpdated);
 	
 	STATE.onTrackingStateChanged(enabled => {
 		if (enabled) {
-			const messages = DISCORD.getMessages();
-			
-			if (messages.length === 0) {
-				stopTrackingDelayed(() => alert("Cannot see any messages."));
-				return;
-			}
-			
 			GUI.setStatus("Starting");
+			GUI.createTrackingStyles();
 			hasJustStarted = true;
-			// noinspection JSIgnoredPromiseFromCall
-			onMessagesUpdated(messages);
+			
+			if (!starter()) {
+				stopTrackingDelayed(() => alert("Cannot see any messages."));
+				hasJustStarted = false;
+			}
 		}
 		else {
 			isSending = false;
+			GUI.deleteTrackingStyles();
 		}
 	});
 	

app/Resources/Tracker/scripts/discord.js

@@ -4,11 +4,26 @@ class DISCORD {
 	
 	// https://discord.com/developers/docs/resources/channel#channel-object-channel-types
 	static CHANNEL_TYPE = {
+		GUILD_TEXT: 0,
 		DM: 1,
 		GROUP_DM: 3,
+		GUILD_ANNOUNCEMENT: 5,
 		ANNOUNCEMENT_THREAD: 10,
 		PUBLIC_THREAD: 11,
-		PRIVATE_THREAD: 12
+		PRIVATE_THREAD: 12,
+		
+		isPrivate(type) {
+			return type === this.DM
+				|| type === this.GROUP_DM;
+		},
+		
+		isNavigableGuildChannel(type) {
+			return type === this.GUILD_TEXT
+				|| type === this.GUILD_ANNOUNCEMENT
+				|| type === this.ANNOUNCEMENT_THREAD
+				|| type === this.PUBLIC_THREAD
+				|| type === this.PRIVATE_THREAD;
+		}
 	};
 	
 	// https://discord.com/developers/docs/resources/channel#message-object-message-types
@@ -18,6 +33,74 @@ class DISCORD {
 		THREAD_STARTER: 21
 	};
 	
+	// https://discord.com/developers/docs/topics/permissions#permissions-bitwise-permission-flags
+	static PERMISSION = {
+		VIEW_CHANNEL: 1n << 10n
+	};
+	
+	/**
+	 * @type {Object}
+	 * @property {function(String): ?DiscordGuild} getGuild
+	 */
+	static #guildStore = WEBPACK.findModule("guildStore", WEBPACK.filterByProps("getGuild", "getGuilds", "getGuildIds"));
+	
+	/**
+	 * @type {Object}
+	 * @property {function(String): Boolean} isOptInEnabled
+	 * @property {function(String): Set<String>} getOptedInChannels
+	 */
+	static #guildSettings = WEBPACK.findModule("guildSettings", WEBPACK.filterByProps("isOptInEnabled", "getOptedInChannels"));
+	
+	/**
+	 * @type {Object}
+	 * @property {function(String): ?DiscordChannel} getChannel
+	 * @property {function(String): Array<DiscordChannel>} getMutableGuildChannelsForGuild
+	 * @property {function(): Array<DiscordChannel>} getSortedPrivateChannels
+	 */
+	static #channelStore = WEBPACK.findModule("channelStore", WEBPACK.filterByProps("getChannel", "getMutableGuildChannelsForGuild", "getSortedPrivateChannels"));
+	
+	/**
+	 * @type {function(BigInt, Object): Boolean}
+	 */
+	static #hasPermission = WEBPACK.findFunction("can", [ "getGuildPermissions", "getChannelPermissions" ]);
+	
+	/**
+	 * @type {function(String): MessageData}
+	 */
+	static #getMessages = WEBPACK.findFunction("getMessages");
+	
+	/**
+	 * @type {function(String): void}
+	 */
+	static #jumpToMessage = WEBPACK.findFunction("jumpToMessage");
+	
+	/**
+	 * @type {function(): String}
+	 */
+	static #getCurrentlySelectedChannelId = WEBPACK.findFunction("getCurrentlySelectedChannelId");
+	
+	/**
+	 * @type {function(String): void}
+	 */
+	static #selectPrivateChannel = WEBPACK.findFunction("selectPrivateChannel", [ "selectChannel" ]);
+	
+	/**
+	 * @type {function(String, Object, String=null): void}
+	 */
+	static #transitionToGuildSync = WEBPACK.findFunction("transitionToGuildSync");
+	
+	static isCompatible() {
+		return !!this.#guildStore
+			&& !!this.#guildSettings
+			&& !!this.#channelStore
+			&& !!this.#hasPermission
+			&& !!this.#getMessages
+			&& !!this.#jumpToMessage
+			&& !!this.#getCurrentlySelectedChannelId
+			&& !!this.#selectPrivateChannel
+			&& !!this.#transitionToGuildSync;
+	}
+	
 	static getMessageOuterElement() {
 		return DOM.queryReactClass("messagesWrapper");
 	}
@@ -26,14 +109,6 @@ class DISCORD {
 		return DOM.queryReactClass("scroller", this.getMessageOuterElement());
 	}
 	
-	static getMessageElements() {
-		return this.getMessageOuterElement().querySelectorAll("[class*='message_']");
-	}
-	
-	static hasMoreMessages() {
-		return document.querySelector("#messagesNavigationDescription + [class^=container]") === null;
-	}
-	
 	static loadOlderMessages() {
 		const view = this.getMessageScrollerElement();
 		
@@ -42,26 +117,43 @@ class DISCORD {
 		}
 	}
 	
+	static getMessagesFromSelectedChannel() {
+		const channelId = this.#getCurrentlySelectedChannelId();
+		return channelId ? this.#getMessages(channelId) : null;
+	}
+	
 	/**
 	 * Calls the provided function with a list of messages whenever the currently loaded messages change.
+	 * @param callback {function(server: ?DiscordGuild, channel: DiscordChannel, messages: Array<DiscordMessage>, hasMoreBefore: boolean)}
 	 */
 	static setupMessageCallback(callback) {
 		const previousMessages = new Set();
 		
-		const onMessageElementsChanged = function() {
-			const messages = DISCORD.getMessages();
-			const hasChanged = messages.some(message => !previousMessages.has(message.id)) || !DISCORD.hasMoreMessages();
+		const onMessageElementsChanged = force => {
+			const messages = this.getMessagesFromSelectedChannel();
+			if (!messages || !messages.ready || messages.loadingMore) {
+				return false;
+			}
 			
+			const channel = this.#channelStore.getChannel(messages.channelId);
+			if (!channel) {
+				return false;
+			}
+			
+			const hasChanged = force || !messages.hasMoreBefore || messages.some(message => !previousMessages.has(message.id));
 			if (!hasChanged) {
-				return;
+				return false;
 			}
 			
 			previousMessages.clear();
-			for (const message of messages) {
+			for (const message of messages._array) {
 				previousMessages.add(message.id);
 			}
 			
-			callback(messages);
+			const server = this.#guildStore.getGuild(channel.guild_id);
+			
+			callback(server, channel, messages._array, messages.hasMoreBefore);
+			return true;
 		};
 		
 		let debounceTimer;
@@ -74,7 +166,7 @@ class DISCORD {
 			debounceTimer = window.setTimeout(onMessageElementsChanged, 100);
 		};
 		
-		const observer = new MutationObserver(function () {
+		const observer = new MutationObserver(function() {
 			onMessageElementsChangedLater();
 		});
 		
@@ -112,216 +204,54 @@ class DISCORD {
 			observedElement = null;
 			window.clearInterval(observerTimer);
 		});
-	}
-	
-	/**
-	 * Returns the message from a message element.
-	 * @returns { null | DiscordMessage } }
-	 */
-	static getMessageFromElement(ele) {
-		const props = DOM.getReactProps(ele);
 		
-		if (props && Array.isArray(props.children)) {
-			for (const child of props.children) {
-				if (!(child instanceof Object)) {
-					continue;
-				}
-				
-				const childProps = child.props;
-				if (childProps instanceof Object && "message" in childProps) {
-					return childProps.message;
-				}
-			}
-		}
-		
-		return null;
-	}
-	
-	/**
-	 * Returns an array containing currently loaded messages.
-	 */
-	static getMessages() {
-		try {
-			const messages = [];
-			
-			for (const ele of this.getMessageElements()) {
-				try {
-					const message = this.getMessageFromElement(ele);
-					
-					if (message != null) {
-						messages.push(message);
-					}
-				} catch (e) {
-					console.error("[DHT] Error extracing message data, skipping it.", e, ele, DOM.tryGetReactProps(ele));
-				}
-			}
-			
-			return messages;
-		} catch (e) {
-			console.error("[DHT] Error retrieving messages.", e);
-			return [];
-		}
-	}
-	
-	/**
-	 * Returns an object containing the selected server and channel information.
-	 * For types DM and GROUP, the server and channel ids and names are identical.
-	 * @returns { {} | null }
-	 */
-	static getSelectedChannel() {
-		try {
-			let obj = null;
-			
-			try {
-				for (const child of DOM.getReactProps(DOM.queryReactClass("chatContent")).children) {
-					if (child && child.props && child.props.channel) {
-						obj = child.props.channel;
-						break;
-					}
-				}
-			} catch (e) {
-				console.error("[DHT] Error retrieving selected channel from 'chatContent' element.", e);
-			}
-			
-			if (!obj || typeof obj.id !== "string") {
-				return null;
-			}
-			
-			const dms = DOM.queryReactClass("privateChannels");
-			
-			if (dms) {
-				let name;
-				
-				for (const ele of dms.querySelectorAll("[class*='channel_'] [class*='selected_'] [class^='name_'] *")) {
-					const node = Array.prototype.find.call(ele.childNodes, node => node.nodeType === Node.TEXT_NODE);
-					
-					if (node) {
-						name = node.nodeValue;
-						break;
-					}
-				}
-				
-				if (!name) {
-					return null;
-				}
-				
-				let type;
-				
-				// https://discord.com/developers/docs/resources/channel#channel-object-channel-types
-				switch (obj.type) {
-					case DISCORD.CHANNEL_TYPE.DM: type = "DM"; break;
-					case DISCORD.CHANNEL_TYPE.GROUP_DM: type = "GROUP"; break;
-					default: return null;
-				}
-				
-				const id = obj.id;
-				const server = { id, name, type };
-				const channel = { id, name };
-				
-				return { server, channel };
-			}
-			else if (obj.guild_id) {
-				let guild;
-				
-				for (const child of DOM.getReactProps(document.querySelector("nav header [class*='headerContent_']")).children) {
-					if (child && child.props && child.props.guild) {
-						guild = child.props.guild;
-						break;
-					}
-				}
-				
-				if (!guild || typeof guild.name !== "string" || obj.guild_id !== guild.id) {
-					return null;
-				}
-				
-				const server = {
-					"id": guild.id,
-					"name": guild.name,
-					"type": "SERVER"
-				};
-				
-				const channel = {
-					"id": obj.id,
-					"name": obj.name,
-					"extra": {
-						"nsfw": obj.nsfw
-					}
-				};
-				
-				if (obj.type === DISCORD.CHANNEL_TYPE.ANNOUNCEMENT_THREAD || obj.type === DISCORD.CHANNEL_TYPE.PUBLIC_THREAD || obj.type === DISCORD.CHANNEL_TYPE.PRIVATE_THREAD) {
-					channel["extra"]["parent"] = obj.parent_id;
-				}
-				else {
-					channel["extra"]["position"] = obj.position;
-					channel["extra"]["topic"] = obj.topic;
-				}
-				
-				return { server, channel };
-			}
-			else {
-				return null;
-			}
-		} catch (e) {
-			console.error("[DHT] Error retrieving selected channel.", e);
-			return null;
-		}
+		return () => onMessageElementsChanged(true);
 	}
 	
 	/**
 	 * Selects the next text channel and returns true, otherwise returns false if there are no more channels.
 	 */
 	static selectNextTextChannel() {
-		const dms = DOM.queryReactClass("privateChannels");
+		const currentChannel = this.#channelStore.getChannel(this.#getCurrentlySelectedChannelId());
+		if (!currentChannel) {
+			return false;
+		}
 		
-		if (dms) {
-			const currentChannel = DOM.queryReactClass("selected", dms);
-			const currentChannelContainer = currentChannel && currentChannel.closest("[class*='channel_']");
-			const nextChannel = currentChannelContainer && currentChannelContainer.nextElementSibling;
+		if (this.CHANNEL_TYPE.isPrivate(currentChannel.type)) {
+			const privateChannel = this.#channelStore.getSortedPrivateChannels();
+			const currentIndex = privateChannel.findIndex(channel => channel.id === currentChannel.id);
 			
-			if (!nextChannel || !nextChannel.getAttribute("class").includes("channel_")) {
+			if (currentIndex === -1 || currentIndex === privateChannel.length - 1) {
 				return false;
 			}
 			
-			const nextChannelLink = nextChannel.querySelector("a[href*='/@me/']");
-			if (!nextChannelLink) {
-				return false;
-			}
-			
-			nextChannelLink.click();
-			nextChannelLink.scrollIntoView(true);
+			this.#selectPrivateChannel(privateChannel[currentIndex + 1].id);
 			return true;
 		}
 		else {
-			const channelListEle = document.getElementById("channels");
-			if (!channelListEle) {
+			const guildId = currentChannel.guild_id;
+			
+			let isChannelOptedIn;
+			if (this.#guildSettings.isOptInEnabled(guildId)) {
+				const optedInChannels = this.#guildSettings.getOptedInChannels(guildId);
+				isChannelOptedIn = channel => optedInChannels.has(channel.id);
+			}
+			else {
+				isChannelOptedIn = _ => true;
+			}
+			
+			const guildChannelMap = this.#channelStore.getMutableGuildChannelsForGuild(guildId);
+			const guildChannels = Object.values(guildChannelMap)
+				.filter(channel => this.CHANNEL_TYPE.isNavigableGuildChannel(channel.type) && isChannelOptedIn(channel) && this.#hasPermission(this.PERMISSION.VIEW_CHANNEL, channel))
+				.sort((a, b) => a.position - b.position);
+			
+			const currentIndex = guildChannels.findIndex(channel => channel.id === currentChannel.id);
+			
+			if (currentIndex === -1 || currentIndex === guildChannels.length - 1) {
 				return false;
 			}
 			
-			function getLinkElement(channel) {
-				return channel.querySelector("a[href^='/channels/'][role='link']");
-			}
-			
-			const allTextChannels = Array.prototype.filter.call(channelListEle.querySelectorAll("[class*='containerDefault']"), ele => getLinkElement(ele) !== null);
-			let nextChannel = null;
-			
-			for (let index = 0; index < allTextChannels.length - 1; index++) {
-				if (allTextChannels[index].className.includes("selected_")) {
-					nextChannel = allTextChannels[index + 1];
-					break;
-				}
-			}
-			
-			if (nextChannel === null) {
-				return false;
-			}
-			
-			const nextChannelLink = getLinkElement(nextChannel);
-			if (!nextChannelLink) {
-				return false;
-			}
-			
-			nextChannelLink.click();
-			nextChannel.scrollIntoView(true);
+			this.#transitionToGuildSync(guildId, {}, guildChannels[currentIndex + 1].id);
 			return true;
 		}
 	}

app/Resources/Tracker/scripts/dom.js

@@ -1,6 +1,8 @@
 class DOM {
 	/**
 	 * Returns a child element by its ID. Parent defaults to the entire document.
+	 * @param {string} id
+	 * @param {HTMLElement?} [parent]
 	 * @returns {HTMLElement}
 	 */
 	static id(id, parent) {
@@ -9,6 +11,9 @@ class DOM {
 	
 	/**
 	 * Returns the first child element containing the specified obfuscated class. Parent defaults to the entire document.
+	 * @param {string} cls
+	 * @param {HTMLElement?} [parent]
+	 * @returns {HTMLElement}
 	 */
 	static queryReactClass(cls, parent) {
 		return (parent || document).querySelector(`[class*="${cls}_"]`);
@@ -55,31 +60,4 @@ class DOM {
 		const value = document.cookie.replace(new RegExp("(?:(?:^|.*;\\s*)" + name + "\\s*\\=\\s*([^;]*).*$)|^.*$"), "$1");
 		return value.length ? JSON.parse(decodeURIComponent(value)) : null;
 	}
-	
-	/**
-	 * Returns internal React state object of an element.
-	 */
-	static getReactProps(ele) {
-		const keys = Object.keys(ele || {});
-		let key = keys.find(key => key.startsWith("__reactInternalInstance"));
-		
-		if (key) {
-			// noinspection JSUnresolvedVariable
-			return ele[key].memoizedProps;
-		}
-		
-		key = keys.find(key => key.startsWith("__reactProps$"));
-		return key ? ele[key] : null;
-	}
-	
-	/**
-	 * Returns internal React state object of an element, or null if the retrieval throws.
-	 */
-	static tryGetReactProps(ele) {
-		try {
-			return this.getReactProps(ele);
-		} catch (e) {
-			return null;
-		}
-	}
 }

app/Resources/Tracker/scripts/gui.js

@@ -2,14 +2,17 @@
 const GUI = (function() {
 	let controller = null;
 	let settings = null;
+	let trackingStyles = null;
 	
 	const stateChangedEvent = () => {
 		if (settings) {
 			settings.ui.cbAutoscroll.checked = SETTINGS.autoscroll;
+			settings.ui.cbHidePreviewsWhileAutoscrolling.checked = SETTINGS.hidePreviewsWhileAutoscrolling;
 			settings.ui.optsAfterFirstMsg[SETTINGS.afterFirstMsg].checked = true;
 			settings.ui.optsAfterSavedMsg[SETTINGS.afterSavedMsg].checked = true;
 			
 			const autoscrollDisabled = !SETTINGS.autoscroll;
+			settings.ui.cbHidePreviewsWhileAutoscrolling.disabled = autoscrollDisabled;
 			Object.values(settings.ui.optsAfterFirstMsg).forEach(ele => ele.disabled = autoscrollDisabled);
 			Object.values(settings.ui.optsAfterSavedMsg).forEach(ele => ele.disabled = autoscrollDisabled);
 		}
@@ -54,6 +57,7 @@ const GUI = (function() {
 			
 			controller.ui.btnClose.addEventListener("click", () => {
 				this.hideController();
+				this.deleteTrackingStyles();
 				window.DHT_ON_UNLOAD.forEach(f => f());
 				delete window.DHT_ON_UNLOAD;
 				delete window.DHT_LOADED;
@@ -84,6 +88,7 @@ const GUI = (function() {
 			const radio = (type, id, label) => "<label><input id='dht-cfg-" + type + "-" + id + "' name='dht-" + type + "' type='radio'> " + label + "</label><br>";
 			const html = `
 <label><input id='dht-cfg-autoscroll' type='checkbox'> Autoscroll</label><br>
+<label><input id='dht-cfg-hide-previews-while-autoscrolling' type='checkbox'> Hide previews to improve browser performance</label><br>
 <br>
 <label>After reaching the first message in channel...</label><br>
 ${radio("afm", "nothing", "Continue Tracking")}
@@ -93,8 +98,7 @@ ${radio("afm", "switch", "Switch to Next Channel")}
 <label>After reaching a previously saved message...</label><br>
 ${radio("asm", "nothing", "Continue Tracking")}
 ${radio("asm", "pause", "Pause Tracking")}
-${radio("asm", "switch", "Switch to Next Channel")}
-<p id='dht-cfg-note'>It is recommended to disable link and image previews to avoid putting unnecessary strain on your browser.</p>`;
+${radio("asm", "switch", "Switch to Next Channel")}`;
 			
 			settings = {
 				styles: DOM.createStyle(`/*[CSS-SETTINGS]*/`),
@@ -107,9 +111,10 @@ ${radio("asm", "switch", "Switch to Next Channel")}
 			});
 			
 			settings.ui = {
-				cbAutoscroll: DOM.id("dht-cfg-autoscroll"),
-				optsAfterFirstMsg: {},
-				optsAfterSavedMsg: {}
+				/** @type {HTMLInputElement} */ cbAutoscroll: DOM.id("dht-cfg-autoscroll"),
+				/** @type {HTMLInputElement} */ cbHidePreviewsWhileAutoscrolling: DOM.id("dht-cfg-hide-previews-while-autoscrolling"),
+				/** @type {Object.<number, HTMLInputElement>} */ optsAfterFirstMsg: {},
+				/** @type {Object.<number, HTMLInputElement>} */ optsAfterSavedMsg: {}
 			};
 			
 			settings.ui.optsAfterFirstMsg[CONSTANTS.AUTOSCROLL_ACTION_NOTHING] = DOM.id("dht-cfg-afm-nothing");
@@ -124,6 +129,10 @@ ${radio("asm", "switch", "Switch to Next Channel")}
 				SETTINGS.autoscroll = settings.ui.cbAutoscroll.checked;
 			});
 			
+			settings.ui.cbHidePreviewsWhileAutoscrolling.addEventListener("change", () => {
+				SETTINGS.hidePreviewsWhileAutoscrolling = settings.ui.cbHidePreviewsWhileAutoscrolling.checked;
+			});
+			
 			Object.keys(settings.ui.optsAfterFirstMsg).forEach(key => {
 				settings.ui.optsAfterFirstMsg[key].addEventListener("click", () => {
 					SETTINGS.afterFirstMsg = key;
@@ -152,6 +161,29 @@ ${radio("asm", "switch", "Switch to Next Channel")}
 			if (controller) {
 				controller.ui.textStatus.innerText = state;
 			}
+		},
+		
+		createTrackingStyles() {
+			if (trackingStyles) {
+				return;
+			}
+			
+			let style = "";
+			
+			if (SETTINGS.autoscroll && SETTINGS.hidePreviewsWhileAutoscrolling) {
+				style += `div[id^="message-accessories-"] { display: none; }`;
+			}
+			
+			if (style.length > 0) {
+				trackingStyles = DOM.createStyle(style);
+			}
+		},
+		
+		deleteTrackingStyles() {
+			if (trackingStyles) {
+				DOM.removeElement(trackingStyles);
+				trackingStyles = null;
+			}
 		}
 	};
 })();

app/Resources/Tracker/scripts/settings.js

@@ -35,17 +35,28 @@ const SETTINGS = (function() {
 		obj[name] = value;
 	};
 	
+	const defaults = {
+		"_autoscroll": true,
+		"_hidePreviewsWhileAutoscrolling": true,
+		"_afterFirstMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE,
+		"_afterSavedMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE,
+	};
+	
 	let loaded = DOM.loadFromCookie("DHT_SETTINGS");
+	let hasChanged = false;
 	
 	if (!loaded) {
-		loaded = {
-			"_autoscroll": true,
-			"_afterFirstMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE,
-			"_afterSavedMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE
-		};
-		
+		loaded = defaults;
 		IS_FIRST_RUN = true;
 	}
+	else {
+		for (const property in defaults) {
+			if (!(property in loaded)) {
+				loaded[property] = defaults[property];
+				hasChanged = true;
+			}
+		}
+	}
 	
 	const root = {
 		onSettingsChanged(callback) {
@@ -54,10 +65,11 @@ const SETTINGS = (function() {
 	};
 	
 	defineTriggeringProperty(root, "autoscroll", loaded._autoscroll);
+	defineTriggeringProperty(root, "hidePreviewsWhileAutoscrolling", loaded._hidePreviewsWhileAutoscrolling);
 	defineTriggeringProperty(root, "afterFirstMsg", loaded._afterFirstMsg);
 	defineTriggeringProperty(root, "afterSavedMsg", loaded._afterSavedMsg);
 	
-	if (IS_FIRST_RUN) {
+	if (IS_FIRST_RUN || hasChanged) {
 		saveSettings();
 	}
 	

app/Resources/Tracker/scripts/state.js

@@ -48,69 +48,49 @@ const STATE = (function() {
 		});
 	};
 	
+	const getDate = function(date) {
+		if (date instanceof Date) {
+			return date;
+		}
+		else {
+			// noinspection JSUnresolvedReference
+			return date.toDate();
+		}
+	};
+	
+	/**
+	 * @param {DiscordChannel} channel
+	 */
+	const getPrivateChannelName = function(channel) {
+		if (channel.name === "") {
+			return channel.rawRecipients.map(user => user.username).join(", ");
+		}
+		else {
+			return channel.name;
+		}
+	};
+	
+	/**
+	 * @param {Number} type
+	 */
+	const getChannelTypeName = function(type) {
+		if (type === DISCORD.CHANNEL_TYPE.DM) {
+			return "DM";
+		}
+		else if (type === DISCORD.CHANNEL_TYPE.GROUP_DM) {
+			return "GROUP";
+		}
+		else {
+			return "SERVER";
+		}
+	};
+	
 	const trackingStateChangedListeners = [];
 	let isTracking = false;
 	
 	const addedChannels = new Set();
 	const addedUsers = new Set();
 	
-	/**
-	 * @name DiscordUser
-	 * @property {String} id
-	 * @property {String} username
-	 * @property {String} discriminator
-	 * @property {String} [avatar]
-	 * @property {Boolean} [bot]
-	 */
-	
-	/**
-	 * @name DiscordMessage
-	 * @property {String} id
-	 * @property {String} channel_id
-	 * @property {DiscordUser} author
-	 * @property {String} content
-	 * @property {Timestamp} timestamp
-	 * @property {Timestamp|null} editedTimestamp
-	 * @property {DiscordAttachment[]} attachments
-	 * @property {Object[]} embeds
-	 * @property {DiscordMessageReaction[]} [reactions]
-	 * @property {DiscordMessageReference} [messageReference]
-	 * @property {Number} type
-	 * @property {String} state
-	 */
-	
-	/**
-	 * @name DiscordAttachment
-	 * @property {String} id
-	 * @property {String} filename
-	 * @property {String} [content_type]
-	 * @property {String} size
-	 * @property {String} url
-	 */
-	
-	/**
-	 * @name DiscordMessageReaction
-	 * @property {DiscordEmoji} emoji
-	 * @property {Number} count
-	 */
-	
-	/**
-	 * @name DiscordMessageReference
-	 * @property {String} [message_id]
-	 */
-	
-	/**
-	 * @name DiscordEmoji
-	 * @property {String|null} id
-	 * @property {String|null} name
-	 * @property {Boolean} animated
-	 */
-	
-	/**
-	 * @name Timestamp
-	 * @property {Function} toDate
-	 */
-	
 	return {
 		setup(port, token) {
 			serverPort = port;
@@ -141,32 +121,51 @@ const STATE = (function() {
 			}
 		},
 		
+		/**
+		 * @param {?DiscordGuild} serverInfo
+		 * @param {DiscordChannel} channelInfo
+		 */
 		async addDiscordChannel(serverInfo, channelInfo) {
 			if (addedChannels.has(channelInfo.id)) {
 				return;
 			}
 			
 			const server = {
-				id: serverInfo.id,
-				name: serverInfo.name,
-				type: serverInfo.type
+				type: getChannelTypeName(channelInfo.type)
 			};
 			
 			const channel = {
 				id: channelInfo.id,
-				name: channelInfo.name
+				extra: {}
 			};
 			
-			if ("extra" in channelInfo) {
-				const extra = channelInfo.extra;
-				
-				if ("parent" in extra) {
-					channel.parent = extra.parent;
-				}
-				
-				channel.position = extra.position;
-				channel.topic = extra.topic;
-				channel.nsfw = extra.nsfw;
+			if (DISCORD.CHANNEL_TYPE.isPrivate(channelInfo.type)) {
+				server.id = channelInfo.id;
+				server.name = channel.name = getPrivateChannelName(channelInfo);
+			}
+			else if (serverInfo) {
+				server.id = serverInfo.id;
+				server.name = serverInfo.name;
+				channel.name = channelInfo.name;
+			}
+			else {
+				return;
+			}
+			
+			if ("nsfw" in channelInfo) {
+				channel.extra.nsfw = channelInfo.nsfw;
+			}
+			
+			if ("topic" in channelInfo) {
+				channel.extra.topic = channelInfo.topic;
+			}
+			
+			if ("position" in channelInfo) {
+				channel.extra.position = channelInfo.position;
+			}
+			
+			if (channelInfo.type === DISCORD.CHANNEL_TYPE.ANNOUNCEMENT_THREAD || channelInfo.type === DISCORD.CHANNEL_TYPE.PUBLIC_THREAD || channelInfo.type === DISCORD.CHANNEL_TYPE.PRIVATE_THREAD) {
+				channel.extra.parent = channelInfo.parent_id;
 			}
 			
 			await post("/track-channel", { server, channel });
@@ -195,6 +194,10 @@ const STATE = (function() {
 						name: user.username
 					};
 					
+					if (user.globalName) {
+						obj.displayName = user.globalName;
+					}
+					
 					if (user.avatar) {
 						obj.avatar = user.avatar;
 					}
@@ -223,12 +226,12 @@ const STATE = (function() {
 					sender: msg.author.id,
 					channel: msg.channel_id,
 					text: msg.content,
-					timestamp: msg.timestamp.toDate().getTime()
+					timestamp: getDate(msg.timestamp).getTime()
 				};
 				
 				if (msg.editedTimestamp !== null) {
 					// noinspection JSUnusedGlobalSymbols
-					obj.editTimestamp = msg.editedTimestamp.toDate().getTime();
+					obj.editTimestamp = getDate(msg.editedTimestamp).getTime();
 				}
 				
 				if (msg.messageReference !== null) {
@@ -283,7 +286,7 @@ const STATE = (function() {
 				}
 				
 				if (msg.reactions.length > 0) {
-					obj.reactions = msg.reactions.map(reaction => {
+					obj.reactions = msg.reactions.filter(reaction => reaction.count > 0).map(reaction => {
 						const emoji = reaction.emoji;
 						
 						const mapped = {

app/Resources/Tracker/scripts/types.js

@@ -0,0 +1,82 @@
+/**
+ * @name DiscordGuild
+ * @property {String} id
+ * @property {String} name
+ */
+
+/**
+ * @name DiscordChannel
+ * @property {String} id
+ * @property {String} name
+ * @property {Number} type
+ * @property {String} [guild_id]
+ * @property {String} [parent_id]
+ * @property {Number} [position]
+ * @property {String} [topic]
+ * @property {Boolean} [nsfw]
+ * @property {DiscordUser[]} [rawRecipients]
+ */
+
+/**
+ * @name DiscordUser
+ * @property {String} id
+ * @property {String} username
+ * @property {String} discriminator
+ * @property {String} [globalName]
+ * @property {String} [avatar]
+ * @property {Boolean} [bot]
+ */
+
+/**
+ * @name DiscordMessage
+ * @property {String} id
+ * @property {String} channel_id
+ * @property {DiscordUser} author
+ * @property {String} content
+ * @property {Date} timestamp
+ * @property {Date|null} editedTimestamp
+ * @property {DiscordAttachment[]} attachments
+ * @property {Object[]} embeds
+ * @property {DiscordMessageReaction[]} [reactions]
+ * @property {DiscordMessageReference} [messageReference]
+ * @property {Number} type
+ * @property {String} state
+ */
+
+/**
+ * @name DiscordAttachment
+ * @property {String} id
+ * @property {String} filename
+ * @property {String} [content_type]
+ * @property {String} size
+ * @property {String} url
+ */
+
+/**
+ * @name DiscordMessageReaction
+ * @property {DiscordEmoji} emoji
+ * @property {Number} count
+ */
+
+/**
+ * @name DiscordMessageReference
+ * @property {String} [message_id]
+ */
+
+/**
+ * @name DiscordEmoji
+ * @property {String|null} id
+ * @property {String|null} name
+ * @property {Boolean} animated
+ */
+
+/**
+ * @name MessageData
+ * @type {Object}
+ * @property {String} channelId
+ * @property {Boolean} ready
+ * @property {Boolean} loadingMore
+ * @property {Boolean} hasMoreAfter
+ * @property {Boolean} hasMoreBefore
+ * @property {Array<DiscordMessage>} _array
+ */

app/Resources/Tracker/scripts/webpack.js

@@ -0,0 +1,98 @@
+/**
+ * Parts copied from Better Discord, licensed under Apache License 2.0.
+ * 
+ * https://github.com/BetterDiscord/BetterDiscord/blob/78edeb77c60542a57884686c4ba98f997c886fad/renderer/src/modules/webpackmodules.js
+ * https://github.com/BetterDiscord/BetterDiscord/blob/78edeb77c60542a57884686c4ba98f997c886fad/LICENSE
+ */
+class WEBPACK {
+	static get require() {
+		if (this._require) {
+			return this._require;
+		}
+		
+		/**
+		 * @type {Object}
+		 * @property {Object} m
+		 * @property {Object} c
+		 */
+		let hookedRequire;
+		
+		const id = "dht-webpackmodules-" + new Date().getTime();
+		if (typeof (window["webpackChunkdiscord_app"]) !== "undefined") {
+			window["webpackChunkdiscord_app"].push([ [ id ], {}, internalRequire => hookedRequire = internalRequire ]);
+		}
+		
+		delete hookedRequire.m[id];
+		delete hookedRequire.c[id];
+		return this._require = hookedRequire;
+	}
+	
+	static getAllModules() {
+		return this.require.c;
+	}
+	
+	static filterByProps(...props) {
+		return module => props.every(prop => prop in module);
+	}
+	
+	static filterByPropsWithPredicate(predicate, ...props) {
+		return module => props.every(prop => prop in module && predicate(module[prop]));
+	}
+	
+	static findModules(filter) {
+		const defaultExport = true;
+		const moduleFilter = module => (typeof module === "object" || typeof module === "function") && filter(module);
+		
+		const results = [];
+		
+		for (const module of Object.values(this.getAllModules())) {
+			/**
+			 * @type {Object}
+			 * @property [Z]
+			 * @property [ZP]
+			 * @property [__esModule]
+			 * @property [default]
+			 */
+			const exports = module.exports;
+			if (!exports || exports === window || exports === document.documentElement || exports[Symbol.toStringTag] === "DOMTokenList") {
+				continue;
+			}
+			
+			let foundModule = null;
+			if (exports.Z && moduleFilter(exports.Z)) {
+				foundModule = defaultExport ? exports.Z : exports;
+			}
+			if (exports.ZP && moduleFilter(exports.ZP)) {
+				foundModule = defaultExport ? exports.ZP : exports;
+			}
+			if (exports.__esModule && exports.default && moduleFilter(exports.default)) {
+				foundModule = defaultExport ? exports.default : exports;
+			}
+			if (moduleFilter(exports)) {
+				foundModule = exports;
+			}
+			
+			if (foundModule) {
+				results.push(foundModule);
+			}
+		}
+		
+		return results;
+	}
+	
+	static findModule(name, filter) {
+		const modules = this.findModules(filter);
+		if (modules.length === 1) {
+			return modules[0];
+		}
+		
+		console.error("[DHT] Cannot find module " + name + ", results found:", modules.length);
+		return null;
+	}
+	
+	static findFunction(name, additionalRequiredProps) {
+		const searchedProps = additionalRequiredProps ? [name, ...additionalRequiredProps] : [name];
+		const matchingModule = this.findModule("containing function " + name, this.filterByPropsWithPredicate(prop => typeof(prop) === "function", ...searchedProps));
+		return matchingModule == null ? null : matchingModule[name].bind(matchingModule);
+	}
+}

app/Resources/Tracker/styles/settings.css

@@ -18,11 +18,13 @@
   height: 262px;
   margin-left: -400px;
   margin-top: -131px;
+  line-height: 120%;
   padding: 8px;
   background-color: #fff;
   z-index: 1000002;
 }
 
-#dht-cfg-note {
-  margin-top: 22px;
+#dht-cfg label {
+  display: inline-block;
+  margin: 1px 0;
 }

app/Resources/Viewer/index.html

@@ -2,21 +2,31 @@
 <html lang="en">
   <head>
     <meta charset="utf-8">
+    <meta name="referrer" content="no-referrer">
+    
     <title>Discord Offline History</title>
     
+    <link rel="icon" href="favicon.ico">
+    
+    <link rel="stylesheet" href="styles/main.css">
+    <link rel="stylesheet" href="styles/menu.css">
+    <link rel="stylesheet" href="styles/channels.css">
+    <link rel="stylesheet" href="styles/messages.css">
+    <link rel="stylesheet" href="styles/modal.css">
+    
     <script type="text/javascript">
-		window.DHT_EMBEDDED = "/*[ARCHIVE]*/";
-		/*[CONSTANTS]*/
-		/*[JS]*/
+		const query = new URLSearchParams(location.search);
+		window.DHT_SERVER_TOKEN = query.get("token");
+		window.DHT_SERVER_SESSION = query.get("session");
     </script>
-    <style>
-      /*[CSS]*/
-    </style>
+    <script type="module" src="scripts/bootstrap.mjs"></script>
   </head>
   <body>
     <div id="menu">
       <button id="btn-settings">Settings</button>
       
+      <div class="splitter"></div>
+      
       <div> <!-- needed to stop the select from messing up -->
         <select id="opt-messages-per-page">
           <option value="50">50 messages per page&nbsp;</option>
@@ -65,7 +75,9 @@
     </div>
     
     <div id="app">
-      <div id="channels"></div>
+      <div id="channels">
+        <div class="loading"></div>
+      </div>
       <div id="messages"></div>
     </div>
     

app/Resources/Viewer/scripts/bootstrap.js

@@ -1,39 +0,0 @@
-document.addEventListener("DOMContentLoaded", () => {
-	DISCORD.setup();
-	GUI.setup();
-	
-	GUI.onOptionMessagesPerPageChanged(() => {
-		STATE.setMessagesPerPage(GUI.getOptionMessagesPerPage());
-	});
-	
-	STATE.setMessagesPerPage(GUI.getOptionMessagesPerPage());
-	
-	GUI.onOptMessageFilterChanged(filter => {
-		STATE.setActiveFilter(filter);
-	});
-	
-	GUI.onNavigationButtonClicked(action => {
-		STATE.updateCurrentPage(action);
-	});
-	
-	STATE.onUsersRefreshed(users => {
-		GUI.updateUserList(users);
-	});
-	
-	STATE.onChannelsRefreshed((channels, selected) => {
-		GUI.updateChannelList(channels, selected, STATE.selectChannel);
-	});
-	
-	STATE.onMessagesRefreshed(messages => {
-		GUI.updateNavigation(STATE.getCurrentPage(), STATE.getPageCount());
-		GUI.updateMessageList(messages);
-		GUI.scrollMessagesToTop();
-	});
-	
-	try {
-		STATE.uploadFile(JSON.parse(window.DHT_EMBEDDED));
-	} catch (e) {
-		console.error(e);
-		alert("Could not parse embedded file, see console for details.");
-	}
-});

app/Resources/Viewer/scripts/bootstrap.mjs

@@ -0,0 +1,111 @@
+import discord from "./discord.mjs";
+import gui from "./gui.mjs";
+import state from "./state.mjs";
+import "./polyfills.mjs";
+
+window.DISCORD = discord;
+
+document.addEventListener("DOMContentLoaded", () => {
+	discord.setup();
+	gui.setup();
+	
+	gui.onOptionMessagesPerPageChanged(() => {
+		state.setMessagesPerPage(gui.getOptionMessagesPerPage());
+	});
+	
+	state.setMessagesPerPage(gui.getOptionMessagesPerPage());
+	
+	gui.onOptMessageFilterChanged(filter => {
+		state.setActiveFilter(filter);
+	});
+	
+	gui.onNavigationButtonClicked(action => {
+		state.updateCurrentPage(action);
+	});
+	
+	state.onUsersRefreshed(users => {
+		gui.updateUserList(users);
+	});
+	
+	state.onChannelsRefreshed((channels, selected) => {
+		gui.updateChannelList(channels, selected, state.selectChannel);
+	});
+	
+	state.onMessagesRefreshed(messages => {
+		gui.updateNavigation(state.getCurrentPage(), state.getPageCount());
+		gui.updateMessageList(messages);
+		gui.scrollMessagesToTop();
+	});
+	
+	async function fetchUrl(path, contentType) {
+		const response = await fetch("/" + path + "?token=" + encodeURIComponent(window.DHT_SERVER_TOKEN) + "&session=" + encodeURIComponent(window.DHT_SERVER_SESSION), {
+			method: "GET",
+			headers: {
+				"Content-Type": contentType,
+			},
+			credentials: "omit",
+			redirect: "error",
+		});
+		
+		if (!response.ok) {
+			throw "Unexpected response status: " + response.statusText;
+		}
+		
+		return response;
+	}
+	
+	async function processLines(response, callback) {
+		let body = "";
+		
+		for await (const chunk of response.body.pipeThrough(new TextDecoderStream("utf-8"))) {
+			body += chunk;
+			
+			let startIndex = 0;
+			
+			while (true) {
+				const endIndex = body.indexOf("\n", startIndex);
+				if (endIndex === -1) {
+					break;
+				}
+				
+				callback(body.substring(startIndex, endIndex));
+				startIndex = endIndex + 1;
+			}
+			
+			body = body.substring(startIndex);
+		}
+		
+		if (body !== "") {
+			callback(body);
+		}
+	}
+	
+	async function loadData() {
+		try {
+			const metadataResponse = await fetchUrl("get-viewer-metadata", "application/json");
+			const metadataJson = await metadataResponse.json();
+			
+			const messagesResponse = await fetchUrl("get-viewer-messages", "application/x-ndjson");
+			const messages = {};
+			
+			await processLines(messagesResponse, line => {
+				const message = JSON.parse(line);
+				const channel = message.c;
+				
+				const channelMessages = messages[channel] || (messages[channel] = {});
+				channelMessages[message.id] = message;
+				
+				delete message.id;
+				delete message.c;
+			});
+			
+			state.uploadFile(metadataJson, messages);
+		} catch (e) {
+			console.error(e);
+			alert("Could not load data, see console for details.");
+			document.querySelector("#channels > div.loading").remove();
+		}
+	}
+	
+	loadData();
+});

app/Resources/Viewer/scripts/discord.mjs

@@ -1,4 +1,10 @@
-const DISCORD = (function() {
+import discord from "./discord.mjs";
+import dom from "./dom.mjs";
+import template from "./template.mjs";
+import settings from "./settings.mjs";
+import state from "./state.mjs";
+
+export default (function() {
 	const regex = {
 		formatBold: /\*\*([\s\S]+?)\*\*(?!\*)/g,
 		formatItalic1: /\*([\s\S]+?)\*(?!\*)/g,
@@ -35,17 +41,14 @@ const DISCORD = (function() {
 	let templateReaction;
 	let templateReactionCustom;
 	
-	const fileUrlProcessor = function(serverUrl, serverToken) {
-		if (typeof serverUrl === "string" && typeof serverToken === "string") {
-			return url => serverUrl + "/get-downloaded-file/" + encodeURIComponent(url) + "?token=" + encodeURIComponent(serverToken);
+	const fileUrlProcessor = function(serverToken) {
+		if (typeof serverToken === "string") {
+			return url => "/get-downloaded-file/" + encodeURIComponent(url) + "?token=" + encodeURIComponent(serverToken);
 		}
 		else {
 			return url => url;
 		}
-	}(
-		window["DHT_SERVER_URL"],
-		window["DHT_SERVER_TOKEN"]
-	);
+	}(window.DHT_SERVER_TOKEN);
 	
 	const getEmoji = function(name, id, extension) {
 		const tag = ":" + name + ":";
@@ -53,9 +56,9 @@ const DISCORD = (function() {
 	};
 	
 	const processMessageContents = function(contents) {
-		let processed = DOM.escapeHTML(contents.replace(regex.formatUrlNoEmbed, "$1"));
+		let processed = dom.escapeHTML(contents.replace(regex.formatUrlNoEmbed, "$1"));
 		
-		if (SETTINGS.enableFormatting) {
+		if (settings.enableFormatting) {
 			const escapeHtmlMatch = (full, match) => "&#" + match.charCodeAt(0) + ";";
 			
 			processed = processed
@@ -71,13 +74,13 @@ const DISCORD = (function() {
 				.replace(regex.formatStrike, "<s>$1</s>");
 		}
 		
-		const animatedEmojiExtension = SETTINGS.enableAnimatedEmoji ? "gif" : "webp";
+		const animatedEmojiExtension = settings.enableAnimatedEmoji ? "gif" : "webp";
 		
 		// noinspection HtmlUnknownTarget
 		processed = processed
 			.replace(regex.formatUrl, "<a href='$1' target='_blank' rel='noreferrer'>$1</a>")
-			.replace(regex.mentionChannel, (full, match) => "<span class='link mention-chat'>#" + STATE.getChannelName(match) + "</span>")
-			.replace(regex.mentionUser, (full, match) => "<span class='link mention-user' title='#" + (STATE.getUserTag(match) || "????") + "'>@" + STATE.getUserName(match) + "</span>")
+			.replace(regex.mentionChannel, (full, match) => "<span class='link mention-chat'>#" + state.getChannelName(match) + "</span>")
+			.replace(regex.mentionUser, (full, match) => "<span class='link mention-user' title='" + state.getUserName(match) + "'>@" + state.getUserDisplayName(match) + "</span>")
 			.replace(regex.customEmojiStatic, (full, m1, m2) => getEmoji(m1, m2, "webp"))
 			.replace(regex.customEmojiAnimated, (full, m1, m2) => getEmoji(m1, m2, animatedEmojiExtension));
 		
@@ -89,7 +92,7 @@ const DISCORD = (function() {
 	};
 	
 	const getImageEmbed = function(url, image) {
-		if (!SETTINGS.enableImagePreviews) {
+		if (!settings.enableImagePreviews) {
 			return "";
 		}
 		
@@ -109,36 +112,36 @@ const DISCORD = (function() {
 	
 	return {
 		setup() {
-			templateChannelServer = new TEMPLATE([
-				"<div data-channel='{id}'>",
+			templateChannelServer = new template([
+				"<div class='channel' data-channel='{id}'>",
 				"<div class='info' title='{topic}'><strong class='name'>#{name}</strong>{nsfw}<span class='tag'>{msgcount}</span></div>",
 				"<span class='server'>{server.name} ({server.type})</span>",
 				"</div>"
 			].join(""));
 			
-			templateChannelPrivate = new TEMPLATE([
-				"<div data-channel='{id}'>",
+			templateChannelPrivate = new template([
+				"<div class='channel' data-channel='{id}'>",
 				"<div class='info'><strong class='name'>{name}</strong><span class='tag'>{msgcount}</span></div>",
 				"<span class='server'>({server.type})</span>",
 				"</div>"
 			].join(""));
 			
-			templateMessageNoAvatar = new TEMPLATE([
+			templateMessageNoAvatar = new template([
 				"<div>",
 				"<div class='reply-message'>{reply}</div>",
-				"<h2><strong class='username' title='#{user.tag}'>{user.name}</strong><span class='info time'>{timestamp}</span>{edit}{jump}</h2>",
+				"<h2><strong class='username' title='{user.name}'>{user.displayName}</strong><span class='info time'>{timestamp}</span>{edit}{jump}</h2>",
 				"<div class='message'>{contents}{embeds}{attachments}</div>",
 				"{reactions}",
 				"</div>"
 			].join(""));
 			
-			templateMessageWithAvatar = new TEMPLATE([
+			templateMessageWithAvatar = new template([
 				"<div>",
 				"<div class='reply-message reply-message-with-avatar'>{reply}</div>",
 				"<div class='avatar-wrapper'>",
 				"<div class='avatar'>{avatar}</div>",
 				"<div>",
-				"<h2><strong class='username' title='#{user.tag}'>{user.name}</strong><span class='info time'>{timestamp}</span>{edit}{jump}</h2>",
+				"<h2><strong class='username' title='{user.name}'>{user.displayName}</strong><span class='info time'>{timestamp}</span>{edit}{jump}</h2>",
 				"<div class='message'>{contents}{embeds}{attachments}</div>",
 				"{reactions}",
 				"</div>",
@@ -147,50 +150,50 @@ const DISCORD = (function() {
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateUserAvatar = new TEMPLATE([
+			templateUserAvatar = new template([
 				"<img src='{url}' alt=''>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateAttachmentDownload = new TEMPLATE([
+			templateAttachmentDownload = new template([
 				"<a href='{url}' class='embed download'>Download {name}</a>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateEmbedImage = new TEMPLATE([
-				"<a href='{url}' class='embed thumbnail loading'><img src='{src}' alt='' onload='DISCORD.handleImageLoad(this)' onerror='DISCORD.handleImageLoadError(this)'></a><br>"
+			templateEmbedImage = new template([
+				"<a href='{url}' class='embed thumbnail loading'><img src='{src}' alt='' onload='window.DISCORD.handleImageLoad(this)' onerror='window.DISCORD.handleImageLoadError(this)'></a><br>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateEmbedImageWithSize = new TEMPLATE([
-				"<a href='{url}' class='embed thumbnail loading'><img src='{src}' width='{width}' height='{height}' alt='' onload='DISCORD.handleImageLoad(this)' onerror='DISCORD.handleImageLoadError(this)'></a><br>"
+			templateEmbedImageWithSize = new template([
+				"<a href='{url}' class='embed thumbnail loading'><img src='{src}' width='{width}' height='{height}' alt='' onload='window.DISCORD.handleImageLoad(this)' onerror='window.DISCORD.handleImageLoadError(this)'></a><br>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateEmbedRich = new TEMPLATE([
+			templateEmbedRich = new template([
 				"<div class='embed download'><a href='{url}' class='title'>{title}</a><p class='desc'>{description}</p></div>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateEmbedRichNoDescription = new TEMPLATE([
+			templateEmbedRichNoDescription = new template([
 				"<div class='embed download'><a href='{url}' class='title'>{title}</a></div>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateEmbedUrl = new TEMPLATE([
+			templateEmbedUrl = new template([
 				"<a href='{url}' class='embed download'>{url}</a>"
 			].join(""));
 			
-			templateEmbedUnsupported = new TEMPLATE([
+			templateEmbedUnsupported = new template([
 				"<div class='embed download'><p>(Unsupported embed)</p></div>"
 			].join(""));
 			
-			templateReaction = new TEMPLATE([
+			templateReaction = new template([
 				"<span class='reaction-wrapper'><span class='reaction-emoji'>{n}</span><span class='count'>{c}</span></span>"
 			].join(""));
 			
 			// noinspection HtmlUnknownTarget
-			templateReactionCustom = new TEMPLATE([
+			templateReactionCustom = new template([
 				"<span class='reaction-wrapper'><img src='{url}' alt=':{n}:' title=':{n}:' class='reaction-emoji-custom'><span class='count'>{c}</span></span>"
 			].join(""));
 		},
@@ -207,7 +210,7 @@ const DISCORD = (function() {
 		},
 		
 		isImageAttachment(attachment) {
-			const url = DOM.tryParseUrl(attachment.url);
+			const url = dom.tryParseUrl(attachment.url);
 			return url != null && isImageUrl(url);
 		},
 		
@@ -220,15 +223,15 @@ const DISCORD = (function() {
 		},
 		
 		getMessageHTML(message) { // noinspection FunctionWithInconsistentReturnsJS
-			return (SETTINGS.enableUserAvatars ? templateMessageWithAvatar : templateMessageNoAvatar).apply(message, (property, value) => {
+			return (settings.enableUserAvatars ? templateMessageWithAvatar : templateMessageNoAvatar).apply(message, (property, value) => {
 				if (property === "avatar") {
 					return value ? templateUserAvatar.apply(getAvatarUrlObject(value)) : "";
 				}
-				else if (property === "user.tag") {
-					return value ? value : "????";
+				else if (property === "user.displayName") {
+					return value ? value : message.user.name;
 				}
 				else if (property === "timestamp") {
-					return DOM.getHumanReadableTime(value);
+					return dom.getHumanReadableTime(value);
 				}
 				else if (property === "contents") {
 					return value && value.length > 0 ? processMessageContents(value) : "";
@@ -243,10 +246,10 @@ const DISCORD = (function() {
 							return templateEmbedUnsupported.apply(embed);
 						}
 						else if ("image" in embed && embed.image.url) {
-							return getImageEmbed(fileUrlProcessor(embed.url), embed.image);
+							return getImageEmbed(embed.url, embed.image);
 						}
 						else if ("thumbnail" in embed && embed.thumbnail.url) {
-							return getImageEmbed(fileUrlProcessor(embed.url), embed.thumbnail);
+							return getImageEmbed(embed.url, embed.thumbnail);
 						}
 						else if ("title" in embed && "description" in embed) {
 							return templateEmbedRich.apply(embed);
@@ -267,7 +270,7 @@ const DISCORD = (function() {
 					return value.map(attachment => {
 						const url = fileUrlProcessor(attachment.url);
 						
-						if (!DISCORD.isImageAttachment(attachment) || !SETTINGS.enableImagePreviews) {
+						if (!discord.isImageAttachment(attachment) || !settings.enableImagePreviews) {
 							return templateAttachmentDownload.apply({ url, name: attachment.name });
 						}
 						else if ("width" in attachment && "height" in attachment) {
@@ -279,18 +282,18 @@ const DISCORD = (function() {
 					}).join("");
 				}
 				else if (property === "edit") {
-					return value ? "<span class='info edited'>Edited " + DOM.getHumanReadableTime(value) + "</span>" : "";
+					return value ? "<span class='info edited'>Edited " + dom.getHumanReadableTime(value) + "</span>" : "";
 				}
 				else if (property === "jump") {
-					return STATE.hasActiveFilter ? "<span class='info jump' data-jump='" + value + "'>Jump to message</span>" : "";
+					return state.hasActiveFilter ? "<span class='info jump' data-jump='" + value + "'>Jump to message</span>" : "";
 				}
 				else if (property === "reply") {
 					if (!value) {
 						return value === null ? "<span class='reply-contents reply-missing'>(replies to an unknown message)</span>" : "";
 					}
 					
-					const user = "<span class='reply-username' title='#" + (value.user.tag ? value.user.tag : "????") + "'>" + value.user.name + "</span>";
-					const avatar = SETTINGS.enableUserAvatars && value.avatar ? "<span class='reply-avatar'>" + templateUserAvatar.apply(getAvatarUrlObject(value.avatar)) + "</span>" : "";
+					const user = "<span class='reply-username' title='" + value.user.name + "'>" + (value.user.displayName ?? value.user.name) + "</span>";
+					const avatar = settings.enableUserAvatars && value.avatar ? "<span class='reply-avatar'>" + templateUserAvatar.apply(getAvatarUrlObject(value.avatar)) + "</span>" : "";
 					const contents = value.contents ? "<span class='reply-contents'>" + processMessageContents(value.contents) + "</span>" : "";
 					
 					return "<span class='jump' data-jump='" + value.id + "'>Jump to reply</span><span class='user'>" + avatar + user + "</span>" + contents;
@@ -302,7 +305,7 @@ const DISCORD = (function() {
 					
 					return "<div class='reactions'>" + value.map(reaction => {
 						if ("id" in reaction){
-							const ext = reaction.a && SETTINGS.enableAnimatedEmoji ? "gif" : "webp";
+							const ext = reaction.a && settings.enableAnimatedEmoji ? "gif" : "webp";
 							const url = fileUrlProcessor("https://cdn.discordapp.com/emojis/" + reaction.id + "." + ext);
 							// noinspection JSUnusedGlobalSymbols
 							return templateReactionCustom.apply({ url, n: reaction.n, c: reaction.c });

app/Resources/Viewer/scripts/dom.mjs

@@ -8,9 +8,12 @@ const HTML_ENTITY_MAP = {
 
 const HTML_ENTITY_REGEX = /[&<>"']/g;
 
-class DOM {
+export default class {
 	/**
 	 * Returns a child element by its ID. Parent defaults to the entire document.
+	 * @param {string} id
+	 * @param {HTMLElement} [parent]
+	 * @returns {HTMLElement|null}
 	 */
 	static id(id, parent) {
 		return (parent || document).getElementById(id);
@@ -18,6 +21,9 @@ class DOM {
 	
 	/**
 	 * Returns an array of all child elements containing the specified class. Parent defaults to the entire document.
+	 * @param {string} cls
+	 * @param {HTMLElement} [parent]
+	 * @returns {HTMLElement[]}
 	 */
 	static cls(cls, parent) {
 		return Array.prototype.slice.call((parent || document).getElementsByClassName(cls));
@@ -25,6 +31,9 @@ class DOM {
 	
 	/**
 	 * Returns an array of all child elements that have the specified tag. Parent defaults to the entire document.
+	 * @param {string} tag
+	 * @param {HTMLElement} [parent]
+	 * @returns {HTMLElement[]}
 	 */
 	static tag(tag, parent) {
 		return Array.prototype.slice.call((parent || document).getElementsByTagName(tag));
@@ -32,6 +41,9 @@ class DOM {
 	
 	/**
 	 * Returns the first child element containing the specified class. Parent defaults to the entire document.
+	 * @param {string} cls
+	 * @param {HTMLElement} [parent]
+	 * @returns {HTMLElement}
 	 */
 	static fcls(cls, parent) {
 		return (parent || document).getElementsByClassName(cls)[0];

app/Resources/Viewer/scripts/gui.mjs

@@ -1,10 +1,16 @@
-const GUI = (function() {
+import dom from "./dom.mjs";
+import discord from "./discord.mjs";
+import settings from "./settings.mjs";
+import state from "./state.mjs";
+
+export default (function() {
 	let eventOnOptMessagesPerPageChanged;
 	let eventOnOptMessageFilterChanged;
 	let eventOnNavButtonClicked;
 	
 	const getActiveFilter = function() {
-		const active = DOM.fcls("active", DOM.id("opt-filter-list"));
+		/** @type HTMLSelectElement */
+		const active = dom.fcls("active", dom.id("opt-filter-list"));
 		
 		return active && active.value !== "" ? {
 			"type": active.getAttribute("data-filter-type"),
@@ -17,12 +23,12 @@ const GUI = (function() {
 	};
 	
 	const showModal = function(width, html) {
-		const dialog = DOM.id("dialog");
+		const dialog = dom.id("dialog");
 		dialog.innerHTML = html;
 		dialog.style.width = width + "px";
 		dialog.style.marginLeft = (-width / 2) + "px";
 		
-		DOM.id("modal").classList.add("visible");
+		dom.id("modal").classList.add("visible");
 		return dialog;
 	};
 	
@@ -38,9 +44,9 @@ const GUI = (function() {
 <label><input id='dht-cfg-animemoji' type='checkbox'> Animated Emoji</label><br>`);
 		
 		const setupCheckBox = function(id, settingName) {
-			const ele = DOM.id(id);
-			ele.checked = SETTINGS[settingName];
-			ele.addEventListener("change", () => SETTINGS[settingName] = ele.checked);
+			const ele = dom.id(id);
+			ele.checked = settings[settingName];
+			ele.addEventListener("change", () => settings[settingName] = ele.checked);
 		};
 		
 		setupCheckBox("dht-cfg-imgpreviews", "enableImagePreviews");
@@ -65,20 +71,20 @@ const GUI = (function() {
 		// ---------
 		
 		setup() {
-			const inputMessageFilter = DOM.id("opt-messages-filter");
-			const containerFilterList = DOM.id("opt-filter-list");
+			const inputMessageFilter = dom.id("opt-messages-filter");
+			const containerFilterList = dom.id("opt-filter-list");
 			
 			const resetActiveFilter = function() {
 				inputMessageFilter.value = "";
 				inputMessageFilter.dispatchEvent(new Event("change"));
 				
-				DOM.id("opt-filter-contents").value = "";
+				dom.id("opt-filter-contents").value = "";
 			};
 			
 			inputMessageFilter.value = ""; // required to prevent browsers from remembering old value
 			
 			inputMessageFilter.addEventListener("change", () => {
-				DOM.cls("active", containerFilterList).forEach(ele => ele.classList.remove("active"));
+				dom.cls("active", containerFilterList).forEach(ele => ele.classList.remove("active"));
 				
 				if (inputMessageFilter.value) {
 					containerFilterList.querySelector("[data-filter-type='" + inputMessageFilter.value + "']").classList.add("active");
@@ -91,11 +97,11 @@ const GUI = (function() {
 				ele.addEventListener(ele.tagName === "SELECT" ? "change" : "input", () => triggerFilterChanged());
 			});
 			
-			DOM.id("opt-messages-per-page").addEventListener("change", () => {
+			dom.id("opt-messages-per-page").addEventListener("change", () => {
 				eventOnOptMessagesPerPageChanged && eventOnOptMessagesPerPageChanged();
 			});
 			
-			DOM.tag("button", DOM.fcls("nav")).forEach(button => {
+			dom.tag("button", dom.fcls("nav")).forEach(button => {
 				button.disabled = true;
 				
 				button.addEventListener("click", () => {
@@ -103,34 +109,34 @@ const GUI = (function() {
 				});
 			});
 			
-			DOM.id("btn-settings").addEventListener("click", () => {
+			dom.id("btn-settings").addEventListener("click", () => {
 				showSettingsModal();
 			});
 			
-			DOM.id("btn-about").addEventListener("click", () => {
+			dom.id("btn-about").addEventListener("click", () => {
 				showInfoModal();
 			});
 			
-			DOM.id("messages").addEventListener("click", e => {
+			dom.id("messages").addEventListener("click", e => {
 				const jump = e.target.getAttribute("data-jump");
 				
 				if (jump) {
 					resetActiveFilter();
 					
-					const index = STATE.navigateToMessage(jump);
+					const index = state.navigateToMessage(jump);
 					
 					if (index === -1) {
 						alert("Message not found.");
 					}
 					else {
-						DOM.id("messages").children[index].scrollIntoView();
+						dom.id("messages").children[index].scrollIntoView();
 					}
 				}
 			});
 			
-			DOM.id("overlay").addEventListener("click", () => {
-				DOM.id("modal").classList.remove("visible");
-				DOM.id("dialog").innerHTML = "";
+			dom.id("overlay").addEventListener("click", () => {
+				dom.id("modal").classList.remove("visible");
+				dom.id("dialog").innerHTML = "";
 			});
 		},
 		
@@ -168,19 +174,19 @@ const GUI = (function() {
 		 */
 		getOptionMessagesPerPage() {
 			/** @type HTMLInputElement */
-			const messagesPerPage = DOM.id("opt-messages-per-page");
+			const messagesPerPage = dom.id("opt-messages-per-page");
 			return parseInt(messagesPerPage.value, 10);
 		},
 		
 		updateNavigation(currentPage, totalPages) {
-			DOM.id("nav-page-current").innerHTML = currentPage;
-			DOM.id("nav-page-total").innerHTML = totalPages || "?";
+			dom.id("nav-page-current").innerHTML = currentPage;
+			dom.id("nav-page-total").innerHTML = totalPages || "?";
 			
-			DOM.id("nav-first").disabled = currentPage === 1;
-			DOM.id("nav-prev").disabled = currentPage === 1;
-			DOM.id("nav-pick").disabled = (totalPages || 0) <= 1;
-			DOM.id("nav-next").disabled = currentPage === (totalPages || 1);
-			DOM.id("nav-last").disabled = currentPage === (totalPages || 1);
+			dom.id("nav-first").disabled = currentPage === 1;
+			dom.id("nav-prev").disabled = currentPage === 1;
+			dom.id("nav-pick").disabled = (totalPages || 0) <= 1;
+			dom.id("nav-next").disabled = currentPage === (totalPages || 1);
+			dom.id("nav-last").disabled = currentPage === (totalPages || 1);
 		},
 		
 		// --------------
@@ -191,7 +197,7 @@ const GUI = (function() {
 		 * Updates the channel list and sets up their click events. The callback is triggered whenever a channel is selected, and takes the channel ID as its argument.
 		 */
 		updateChannelList(channels, selected, callback) {
-			const eleChannels = DOM.id("channels");
+			const eleChannels = dom.id("channels");
 			
 			if (!channels) {
 				eleChannels.innerHTML = "";
@@ -201,11 +207,11 @@ const GUI = (function() {
 					channels = channels.filter(channel => channel.msgcount > 0);
 				}
 				
-				eleChannels.innerHTML = channels.map(channel => DISCORD.getChannelHTML(channel)).join("");
+				eleChannels.innerHTML = channels.map(channel => discord.getChannelHTML(channel)).join("");
 				
 				Array.prototype.forEach.call(eleChannels.children, ele => {
 					ele.addEventListener("click", () => {
-						const currentChannel = DOM.fcls("active", eleChannels);
+						const currentChannel = dom.fcls("active", eleChannels);
 						
 						if (currentChannel) {
 							currentChannel.classList.remove("active");
@@ -224,12 +230,12 @@ const GUI = (function() {
 		},
 		
 		updateMessageList(messages) {
-			DOM.id("messages").innerHTML = messages ? messages.map(message => DISCORD.getMessageHTML(message)).join("") : "";
+			dom.id("messages").innerHTML = messages ? messages.map(message => discord.getMessageHTML(message)).join("") : "";
 		},
 		
 		updateUserList(users) {
 			/** @type HTMLSelectElement */
-			const eleSelect = DOM.id("opt-filter-user");
+			const eleSelect = dom.id("opt-filter-user");
 			
 			while (eleSelect.length > 1) {
 				eleSelect.remove(1);
@@ -237,10 +243,11 @@ const GUI = (function() {
 			
 			const options = [];
 			
-			for (const key of Object.keys(users)) {
+			for (const id of Object.keys(users)) {
+				const user = users[id];
 				const option = document.createElement("option");
-				option.value = key;
-				option.text = users[key].name;
+				option.value = id;
+				option.text = user.displayName ? `${user.displayName} (${user.name})` : user.name;
 				options.push(option);
 			}
 			
@@ -249,7 +256,7 @@ const GUI = (function() {
 		},
 		
 		scrollMessagesToTop() {
-			DOM.id("messages").scrollTop = 0;
+			dom.id("messages").scrollTop = 0;
 		}
 	};
 })();

app/Resources/Viewer/scripts/polyfills.mjs

@@ -0,0 +1,35 @@
+// https://gist.github.com/MattiasBuelens/496fc1d37adb50a733edd43853f2f60e/088f061ab79b296f29225467ae9ba86ff990195d
+
+ReadableStream.prototype.values ??= function({ preventCancel = false } = {}) {
+	const reader = this.getReader();
+	return {
+		async next() {
+			try {
+				const result = await reader.read();
+				if (result.done) {
+					reader.releaseLock();
+				}
+				return result;
+			} catch (e) {
+				reader.releaseLock();
+				throw e;
+			}
+		},
+		async return(value) {
+			if (!preventCancel) {
+				const cancelPromise = reader.cancel(value);
+				reader.releaseLock();
+				await cancelPromise;
+			}
+			else {
+				reader.releaseLock();
+			}
+			return { done: true, value };
+		},
+		[Symbol.asyncIterator]() {
+			return this;
+		}
+	};
+};
+
+ReadableStream.prototype[Symbol.asyncIterator] ??= ReadableStream.prototype.values;

app/Resources/Viewer/scripts/processor.mjs

@@ -1,16 +1,16 @@
-const PROCESSOR = {};
+import discord from "./discord.mjs";
 
 // ------------------------
 // Global filter generators
 // ------------------------
 
-PROCESSOR.FILTER = {
-	byUser: ((userindex) => message => message.u === userindex),
+const filter = {
+	byUser: ((user) => message => message.u === user),
 	byTime: ((timeStart, timeEnd) => message => message.t >= timeStart && message.t <= timeEnd),
 	byContents: ((substr) => message => ("m" in message ? message.m : "").indexOf(substr) !== -1),
 	byRegex: ((regex) => message => regex.test("m" in message ? message.m : "")),
-	withImages: (() => message => (message.e && message.e.some(embed => embed.type === "image")) || (message.a && message.a.some(DISCORD.isImageAttachment))),
-	withDownloads: (() => message => message.a && message.a.some(attachment => !DISCORD.isImageAttachment(attachment))),
+	withImages: (() => message => (message.e && message.e.some(embed => embed.type === "image")) || (message.a && message.a.some(discord.isImageAttachment))),
+	withDownloads: (() => message => message.a && message.a.some(attachment => !discord.isImageAttachment(attachment))),
 	withEmbeds: (() => message => message.e && message.e.length > 0),
 	withAttachments: (() => message => message.a && message.a.length > 0),
 	isEdited: (() => message => ("te" in message) ? message.te : (message.f & 1) === 1)
@@ -20,7 +20,7 @@ PROCESSOR.FILTER = {
 // Global sorters
 // --------------
 
-PROCESSOR.SORTER = {
+const sorter = {
 	oldestToNewest: (key1, key2) => {
 		if (key1.length === key2.length) {
 			return key1 > key2 ? 1 : key1 < key2 ? -1 : 0;
@@ -39,3 +39,8 @@ PROCESSOR.SORTER = {
 		}
 	}
 };
+
+export default {
+	FILTER: filter,
+	SORTER: sorter
+};

app/Resources/Viewer/scripts/settings.mjs

@@ -1,4 +1,4 @@
-const SETTINGS = (function() {
+export default (function() {
 	/**
 	 * @type {{}}
 	 * @property {Function} onSettingsChanged

app/Resources/Viewer/scripts/state.mjs

@@ -1,10 +1,12 @@
+import settings from "./settings.mjs";
+import processor from "./processor.mjs";
+
 // noinspection FunctionWithInconsistentReturnsJS
-const STATE = (function() {
+export default (function() {
 	/**
 	 * @type {{}}
 	 * @property {{}} users
-	 * @property {String[]} userindex
-	 * @property {{}[]} servers
+	 * @property {{}} servers
 	 * @property {{}} channels
 	 */
 	let loadedFileMeta;
@@ -17,20 +19,16 @@ const STATE = (function() {
 	let currentPage;
 	let messagesPerPage;
 	
-	const getUser = function(index) {
-		return loadedFileMeta.users[loadedFileMeta.userindex[index]] || { "name": "<unknown>" };
-	};
-	
-	const getUserId = function(index) {
-		return loadedFileMeta.userindex[index];
+	const getUser = function(id) {
+		return loadedFileMeta.users[id] || { "name": "<unknown>" };
 	};
 	
 	const getUserList = function() {
 		return loadedFileMeta ? loadedFileMeta.users : [];
 	};
 	
-	const getServer = function(index) {
-		return loadedFileMeta.servers[index] || { "name": "<unknown>", "type": "unknown" };
+	const getServer = function(id) {
+		return loadedFileMeta.servers[id] || { "name": "<unknown>", "type": "unknown" };
 	};
 	
 	const generateChannelHierarchy = function() {
@@ -173,7 +171,7 @@ const STATE = (function() {
 	};
 	
 	const getMessageChannel = function(id) {
-		for (const [ channel, messages ] of Object.entries(loadedFileData)) {
+		for (const [ channel, messages ] of Object.entries(loadedFileData)) { 
 			if (id in messages) {
 				return channel;
 			}
@@ -204,7 +202,7 @@ const STATE = (function() {
 			 */
 			const message = messages[key];
 			const user = getUser(message.u);
-			const avatar = user.avatar ? { id: getUserId(message.u), path: user.avatar } : null;
+			const avatar = user.avatar ? { id: message.u, path: user.avatar } : null;
 			
 			const obj = {
 				user,
@@ -232,7 +230,7 @@ const STATE = (function() {
 			if ("r" in message) {
 				const replyMessage = getMessageById(message.r);
 				const replyUser = replyMessage ? getUser(replyMessage.u) : null;
-				const replyAvatar = replyUser && replyUser.avatar ? { id: getUserId(replyMessage.u), path: replyUser.avatar } : null;
+				const replyAvatar = replyUser && replyUser.avatar ? { id: replyMessage.u, path: replyUser.avatar } : null;
 				
 				obj["reply"] = replyMessage ? {
 					"id": message.r,
@@ -290,20 +288,17 @@ const STATE = (function() {
 			eventOnUsersRefreshed = callback;
 		},
 		
-		/**
-		 * @param {{ meta, data }} file
-		 */
-		uploadFile(file) {
+		uploadFile(meta, data) {
 			if (loadedFileMeta != null) {
 				throw "A file is already loaded!";
 			}
 			
-			if (!file || typeof file.meta !== "object" || typeof file.data !== "object") {
+			if (typeof meta !== "object" || typeof data !== "object") {
 				throw "Invalid file format!";
 			}
 			
-			loadedFileMeta = file.meta;
-			loadedFileData = file.data;
+			loadedFileMeta = meta;
+			loadedFileData = data;
 			loadedMessages = null;
 			
 			selectedChannel = null;
@@ -313,7 +308,7 @@ const STATE = (function() {
 			triggerChannelsRefreshed();
 			triggerMessagesRefreshed();
 			
-			SETTINGS.onSettingsChanged(() => triggerMessagesRefreshed());
+			settings.onSettingsChanged(() => triggerMessagesRefreshed());
 		},
 		
 		getChannelName(channel) {
@@ -321,21 +316,21 @@ const STATE = (function() {
 			return (channelObj && channelObj.name) || channel;
 		},
 		
-		getUserTag(user) {
-			const userObj = loadedFileMeta.users[user];
-			return (userObj && userObj.tag) || "????";
-		},
-		
 		getUserName(user) {
 			const userObj = loadedFileMeta.users[user];
 			return (userObj && userObj.name) || user;
 		},
 		
+		getUserDisplayName(user) {
+			const userObj = loadedFileMeta.users[user];
+			return (userObj && (userObj.displayName || userObj.name)) || user;
+		},
+		
 		selectChannel(channel) {
 			currentPage = 1;
 			selectedChannel = channel;
 			
-			loadedMessages = getFilteredMessageKeys(channel).sort(PROCESSOR.SORTER.oldestToNewest);
+			loadedMessages = getFilteredMessageKeys(channel).sort(processor.SORTER.oldestToNewest);
 			triggerMessagesRefreshed();
 		},
 		
@@ -416,23 +411,23 @@ const STATE = (function() {
 		setActiveFilter(filter) {
 			switch (filter ? filter.type : "") {
 				case "user":
-					filterFunction = PROCESSOR.FILTER.byUser(loadedFileMeta.userindex.indexOf(filter.value));
+					filterFunction = processor.FILTER.byUser(filter.value);
 					break;
 				
 				case "contents":
-					filterFunction = PROCESSOR.FILTER.byContents(filter.value);
+					filterFunction = processor.FILTER.byContents(filter.value);
 					break;
 				
 				case "withimages":
-					filterFunction = PROCESSOR.FILTER.withImages();
+					filterFunction = processor.FILTER.withImages();
 					break;
 				
 				case "withdownloads":
-					filterFunction = PROCESSOR.FILTER.withDownloads();
+					filterFunction = processor.FILTER.withDownloads();
 					break;
 				
 				case "edited":
-					filterFunction = PROCESSOR.FILTER.isEdited();
+					filterFunction = processor.FILTER.isEdited();
 					break;
 				
 				default:

app/Resources/Viewer/scripts/template.mjs

@@ -1,6 +1,8 @@
+import dom from "./dom.mjs";
+
 const TEMPLATE_REGEX = /{([^{}]+?)}/g;
 
-class TEMPLATE {
+export default class {
 	constructor(contents) {
 		this.contents = contents;
 	};
@@ -11,10 +13,10 @@ class TEMPLATE {
 			
 			if (processor) {
 				const updated = processor(match, value);
-				return typeof updated === "undefined" ? DOM.escapeHTML(value) : updated;
+				return typeof updated === "undefined" ? dom.escapeHTML(value) : updated;
 			}
 			
-			return DOM.escapeHTML(value);
+			return dom.escapeHTML(value);
 		});
 	}
 }

app/Resources/Viewer/styles/channels.css

@@ -3,18 +3,24 @@
   min-width: 215px;
   max-width: 300px;
   overflow-y: auto;
+  color: #eee;
   background-color: #1c1e22;
+  font-size: 15px;
 }
 
-#channels > div {
+#channels > div.loading {
+  margin: 0 auto;
+  width: 150px;
+  height: 150px;
+}
+
+#channels > div.channel {
   cursor: pointer;
   padding: 10px 12px;
-  color: #eee;
-  font-size: 15px;
   border-bottom: 1px solid #333333;
 }
 
-#channels > div:hover, #channels > div.active {
+#channels > div.channel:hover, #channels > div.channel.active {
   background-color: #282b30;
 }
 

app/Resources/Viewer/styles/main.css

@@ -11,3 +11,20 @@ body {
   display: flex;
   flex-direction: row;
 }
+
+.loading {
+  position: relative;
+  --loading-backdrop: rgba(0, 0, 0, 0);
+}
+
+.loading::after {
+  content: "";
+  background: var(--loading-backdrop)
+  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 300' preserveAspectRatio='xMidYMid'%3E %3Ccircle cx='150' cy='150' fill='none' stroke='%237983f5' stroke-width='8' r='42' stroke-dasharray='198 68'%3E %3CanimateTransform attributeName='transform' type='rotate' repeatCount='indefinite' dur='1.25s' values='0 150 150;360 150 150' keyTimes='0;1' /%3E %3C/circle%3E %3C/svg%3E")
+  no-repeat center center;
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}

app/Resources/Viewer/styles/menu.css

@@ -1,15 +1,16 @@
 #menu {
-  width: 100%;
-  height: 48px;
   display: flex;
   flex-direction: row;
+  align-items: stretch;
+  gap: 8px;
+  padding: 8px;
   background-color: #17181c;
   border-bottom: 1px dotted #5d626b;
 }
 
 #menu .splitter {
-  width: 1px;
-  margin: 9px 4px;
+  flex: 0 0 1px;
+  margin: 9px 1px;
   background-color: #5d626b;
 }
 
@@ -23,7 +24,8 @@
 }
 
 #menu button, #menu select, #menu input[type="text"] {
-  margin: 8px;
+  height: 31px;
+  padding: 0 10px;
   background-color: #7289da;
   color: #fff;
   text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.75);
@@ -31,28 +33,25 @@
 
 #menu button {
   font-size: 17px;
-  padding: 0 12px;
   border: 0;
   cursor: pointer;
+  white-space: nowrap;
 }
 
 #menu select {
   font-size: 14px;
-  padding: 6px;
   border: 0;
   cursor: pointer;
 }
 
 #menu input[type="text"] {
   font-size: 14px;
-  padding: 7px 12px;
   border: 0;
 }
 
 #menu .nav {
   display: flex;
   flex-direction: row;
-  margin: 0 8px;
 }
 
 #menu .nav > button {
@@ -66,7 +65,7 @@
 }
 
 #menu .nav > button, #menu .nav > p {
-  margin: 8px 1px;
+  margin: 0 1px;
 }
 
 #opt-filter-list > select, #opt-filter-list > input {
@@ -76,3 +75,7 @@
 #opt-filter-list > .active {
   display: block;
 }
+
+#btn-about {
+  margin-left: auto;
+}

app/Resources/Viewer/styles/messages.css

@@ -107,23 +107,11 @@
 }
 
 .message .thumbnail {
-  position: relative;
+  --loading-backdrop: rgba(0, 0, 0, 0.75);
   max-width: calc(100% - 20px);
   max-height: 320px;
 }
 
-.message .thumbnail.loading::after {
-  content: "";
-  background: rgba(0, 0, 0, 0.75)
-              url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 300' preserveAspectRatio='xMidYMid'%3E %3Ccircle cx='150' cy='150' fill='none' stroke='%237983f5' stroke-width='8' r='42' stroke-dasharray='198 68'%3E %3CanimateTransform attributeName='transform' type='rotate' repeatCount='indefinite' dur='1.25s' values='0 150 150;360 150 150' keyTimes='0;1' /%3E %3C/circle%3E %3C/svg%3E")
-              no-repeat center center;
-  position: absolute;
-  top: 0;
-  left: 0;
-  width: 100%;
-  height: 100%;
-}
-
 .message .thumbnail img {
   width: auto;
   max-width: 100%;

app/Server/Data/DownloadWithData.cs

@@ -1,3 +0,0 @@
-namespace DHT.Server.Data;
-
-public readonly record struct DownloadWithData(Download Download, byte[]? Data);

app/Server/Data/Settings/SettingsKey.cs

@@ -0,0 +1,60 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace DHT.Server.Data.Settings;
+
+public static class SettingsKey {
+	public static Bool DownloadsAutoStart { get; } = new ("downloads_auto_start");
+	public static Bool DownloadsLimitSize { get; } = new ("downloads_limit_size");
+	public static UnsignedLong DownloadsMaximumSize { get; } = new ("downloads_maximum_size");
+	public static String DownloadsMaximumSizeUnit { get; } = new ("downloads_maximum_size_unit");
+
+	public sealed class String(string key) : SettingsKey<string>(key) {
+		internal override bool FromString(string value, out string result) {
+			result = value;
+			return true;
+		}
+
+		internal override string ToString(string value) {
+			return value;
+		}
+	}
+	
+	public sealed class Bool(string key) : SettingsKey<bool>(key) {
+		internal override bool FromString(string value, out bool result) {
+			switch (value) {
+				case "1":
+					result = true;
+					return true;
+
+				case "0":
+					result = false;
+					return true;
+
+				default:
+					result = false;
+					return false;
+			}
+		}
+
+		internal override string ToString(bool value) {
+			return value ? "1" : "0";
+		}
+	}
+	
+	public sealed class UnsignedLong(string key) : SettingsKey<ulong>(key) {
+		internal override bool FromString(string value, out ulong result) {
+			return ulong.TryParse(value, out result);
+		}
+
+		internal override string ToString(ulong value) {
+			return value.ToString();
+		}
+	}
+}
+
+public abstract class SettingsKey<T>(string key) {
+	internal string Key => key;
+
+	internal abstract bool FromString(string value, [NotNullWhen(true)] out T result);
+	internal abstract string ToString(T value);
+}

app/Server/Data/User.cs

@@ -3,6 +3,7 @@ namespace DHT.Server.Data;
 public readonly struct User {
 	public ulong Id { get; init; }
 	public string Name { get; init; }
+	public string? DisplayName { get; init; }
 	public string? AvatarUrl { get; init; }
 	public string? Discriminator { get; init; }
 }

app/Server/Database/DatabaseExtensions.cs

@@ -26,7 +26,9 @@ public static class DatabaseExtensions {
 		await target.Messages.Add(batchedMessages);
 
 		await foreach (var download in source.Downloads.Get()) {
-			await target.Downloads.AddDownload(await source.Downloads.HydrateWithData(download));
+			if (download.Status != DownloadStatus.Success || !await source.Downloads.GetDownloadData(download.NormalizedUrl, stream => target.Downloads.AddDownload(download, stream))) {
+				await target.Downloads.AddDownload(download, stream: null);
+			}
 		}
 	}
 }

app/Server/Database/DummyDatabaseFile.cs

@@ -10,6 +10,7 @@ sealed class DummyDatabaseFile : IDatabaseFile {
 
 	public string Path => "";
 	
+	public ISettingsRepository Settings { get; } = new ISettingsRepository.Dummy();
 	public IUserRepository Users { get; } = new IUserRepository.Dummy();
 	public IServerRepository Servers { get; } = new IServerRepository.Dummy();
 	public IChannelRepository Channels { get; } = new IChannelRepository.Dummy();

app/Server/Database/Export/Snowflake.cs

@@ -1,3 +1,5 @@
 namespace DHT.Server.Database.Export;
 
-readonly record struct Snowflake(ulong Id);
+readonly record struct Snowflake(ulong Id) {
+	public static implicit operator Snowflake(ulong id) => new (id);
+}

app/Server/Database/Export/ViewerJson.cs

@@ -3,14 +3,10 @@ using System.Text.Json.Serialization;
 
 namespace DHT.Server.Database.Export;
 
-sealed class ViewerJson {
-	public required JsonMeta Meta { get; init; }
-	public required Dictionary<Snowflake, Dictionary<Snowflake, JsonMessage>> Data { get; init; }
-
+static class ViewerJson {
 	public sealed class JsonMeta {
 		public required Dictionary<Snowflake, JsonUser> Users { get; init; }
-		public required List<Snowflake> Userindex { get; init; }
-		public required List<JsonServer> Servers { get; init; }
+		public required Dictionary<Snowflake, JsonServer> Servers { get; init; }
 		public required Dictionary<Snowflake, JsonChannel> Channels { get; init; }
 	}
 	
@@ -18,10 +14,10 @@ sealed class ViewerJson {
 		public required string Name { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-		public string? Avatar { get; init; }
+		public string? DisplayName { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-		public string? Tag { get; init; }
+		public string? Avatar { get; init; }
 	}
 
 	public sealed class JsonServer {
@@ -30,7 +26,7 @@ sealed class ViewerJson {
 	}
 
 	public sealed class JsonChannel {
-		public required int Server { get; init; }
+		public required Snowflake Server { get; init; }
 		public required string Name { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
@@ -47,7 +43,9 @@ sealed class ViewerJson {
 	}
 
 	public sealed class JsonMessage {
-		public required int U { get; init; }
+		public required Snowflake Id { get; init; }
+		public required Snowflake C { get; init; }
+		public required Snowflake U { get; init; }
 		public required long T { get; init; }
 
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]

app/Server/Database/Export/ViewerJsonExport.cs

@@ -2,7 +2,9 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Text.Json;
+using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
 using DHT.Server.Data.Filters;
@@ -10,109 +12,93 @@ using DHT.Utils.Logging;
 
 namespace DHT.Server.Database.Export;
 
-public static class ViewerJsonExport {
+static class ViewerJsonExport {
 	private static readonly Log Log = Log.ForType(typeof(ViewerJsonExport));
 
-	public static async Task Generate(Stream stream, IDatabaseFile db, MessageFilter? filter = null) {
+	public static async Task GetMetadata(Stream stream, IDatabaseFile db, MessageFilter? filter = null, CancellationToken cancellationToken = default) {
 		var perf = Log.Start();
 
-		var includedUserIds = new HashSet<ulong>();
-		var includedChannelIds = new HashSet<ulong>();
+		var includedChannels = new List<Channel>();
 		var includedServerIds = new HashSet<ulong>();
 
-		var includedMessages = await db.Messages.Get(filter).ToListAsync();
-		var includedChannels = new List<Channel>();
+		var channelIdFilter = filter?.ChannelIds;
 
-		foreach (var message in includedMessages) {
-			includedUserIds.Add(message.Sender);
-			includedChannelIds.Add(message.Channel);
-		}
-
-		await foreach (var channel in db.Channels.Get()) {
-			if (includedChannelIds.Contains(channel.Id)) {
+		await foreach (var channel in db.Channels.Get(cancellationToken)) {
+			if (channelIdFilter == null || channelIdFilter.Contains(channel.Id)) {
 				includedChannels.Add(channel);
 				includedServerIds.Add(channel.Server);
 			}
 		}
 
-		var (users, userIndex, userIndices) = await GenerateUserList(db, includedUserIds);
-		var (servers, serverIndices) = await GenerateServerList(db, includedServerIds);
-		var channels = GenerateChannelList(includedChannels, serverIndices);
+		var users = await GenerateUserList(db, cancellationToken);
+		var servers = await GenerateServerList(db, includedServerIds, cancellationToken);
+		var channels = GenerateChannelList(includedChannels);
+
+		var meta = new ViewerJson.JsonMeta {
+			Users = users,
+			Servers = servers,
+			Channels = channels
+		};
 
 		perf.Step("Collect database data");
 
-		var value = new ViewerJson {
-			Meta = new ViewerJson.JsonMeta {
-				Users = users,
-				Userindex = userIndex,
-				Servers = servers,
-				Channels = channels
-			},
-			Data = GenerateMessageList(includedMessages, userIndices)
-		};
-
-		perf.Step("Generate value object");
-
-		await JsonSerializer.SerializeAsync(stream, value, ViewerJsonContext.Default.ViewerJson);
+		await JsonSerializer.SerializeAsync(stream, meta, ViewerJsonMetadataContext.Default.JsonMeta, cancellationToken);
 
 		perf.Step("Serialize to JSON");
 		perf.End();
 	}
 
-	private static async Task<(Dictionary<Snowflake, ViewerJson.JsonUser> Users, List<Snowflake> UserIndex, Dictionary<ulong, int> UserIndices)> GenerateUserList(IDatabaseFile db, HashSet<ulong> userIds) {
+	public static async Task GetMessages(Stream stream, IDatabaseFile db, MessageFilter? filter = null, CancellationToken cancellationToken = default) {
+		var perf = Log.Start();
+
+		ReadOnlyMemory<byte> newLine = "\n"u8.ToArray();
+		
+		await foreach(var message in GenerateMessageList(db, filter, cancellationToken)) {
+			await JsonSerializer.SerializeAsync(stream, message, ViewerJsonMessageContext.Default.JsonMessage, cancellationToken);
+			await stream.WriteAsync(newLine, cancellationToken);
+		}
+
+		perf.Step("Generate and serialize messages to JSON");
+		perf.End();
+	}
+
+	private static async Task<Dictionary<Snowflake, ViewerJson.JsonUser>> GenerateUserList(IDatabaseFile db, CancellationToken cancellationToken) {
 		var users = new Dictionary<Snowflake, ViewerJson.JsonUser>();
-		var userIndex = new List<Snowflake>();
-		var userIndices = new Dictionary<ulong, int>();
 
-		await foreach (var user in db.Users.Get()) {
-			var id = user.Id;
-			if (!userIds.Contains(id)) {
-				continue;
-			}
-
-			var idSnowflake = new Snowflake(id);
-			userIndices[id] = users.Count;
-			userIndex.Add(idSnowflake);
-			
-			users[idSnowflake] = new ViewerJson.JsonUser {
+		await foreach (var user in db.Users.Get(cancellationToken)) {
+			users[user.Id] = new ViewerJson.JsonUser {
 				Name = user.Name,
+				DisplayName = user.DisplayName,
 				Avatar = user.AvatarUrl,
-				Tag = user.Discriminator
 			};
 		}
 
-		return (users, userIndex, userIndices);
+		return users;
 	}
 
-	private static async Task<(List<ViewerJson.JsonServer> Servers, Dictionary<ulong, int> ServerIndices)> GenerateServerList(IDatabaseFile db, HashSet<ulong> serverIds) {
-		var servers = new List<ViewerJson.JsonServer>();
-		var serverIndices = new Dictionary<ulong, int>();
+	private static async Task<Dictionary<Snowflake, ViewerJson.JsonServer>> GenerateServerList(IDatabaseFile db, HashSet<ulong> serverIds, CancellationToken cancellationToken) {
+		var servers = new Dictionary<Snowflake, ViewerJson.JsonServer>();
 
-		await foreach (var server in db.Servers.Get()) {
-			var id = server.Id;
-			if (!serverIds.Contains(id)) {
+		await foreach (var server in db.Servers.Get(cancellationToken)) {
+			if (!serverIds.Contains(server.Id)) {
 				continue;
 			}
 
-			serverIndices[id] = servers.Count;
-			
-			servers.Add(new ViewerJson.JsonServer {
+			servers[server.Id] = new ViewerJson.JsonServer {
 				Name = server.Name,
 				Type = ServerTypes.ToJsonViewerString(server.Type)
-			});
+			};
 		}
 
-		return (servers, serverIndices);
+		return servers;
 	}
 
-	private static Dictionary<Snowflake, ViewerJson.JsonChannel> GenerateChannelList(List<Channel> includedChannels, Dictionary<ulong, int> serverIndices) {
+	private static Dictionary<Snowflake, ViewerJson.JsonChannel> GenerateChannelList(List<Channel> includedChannels) {
 		var channels = new Dictionary<Snowflake, ViewerJson.JsonChannel>();
 
 		foreach (var channel in includedChannels) {
-			var channelIdSnowflake = new Snowflake(channel.Id);
-			
-			channels[channelIdSnowflake] = new ViewerJson.JsonChannel {
-				Server = serverIndices[channel.Server],
+			channels[channel.Id] = new ViewerJson.JsonChannel {
+				Server = channel.Server,
 				Name = channel.Name,
 				Parent = channel.ParentId?.ToString(),
 				Position = channel.Position,
@@ -124,51 +110,40 @@ public static class ViewerJsonExport {
 		return channels;
 	}
 
-	private static Dictionary<Snowflake, Dictionary<Snowflake, ViewerJson.JsonMessage>> GenerateMessageList(List<Message> includedMessages, Dictionary<ulong, int> userIndices) {
-		var data = new Dictionary<Snowflake, Dictionary<Snowflake, ViewerJson.JsonMessage>>();
+	private static async IAsyncEnumerable<ViewerJson.JsonMessage> GenerateMessageList(IDatabaseFile db, MessageFilter? filter, [EnumeratorCancellation] CancellationToken cancellationToken) {
+		await foreach (var message in db.Messages.Get(filter, cancellationToken)) {
+			yield return new ViewerJson.JsonMessage {
+				Id = message.Id,
+				C = message.Channel,
+				U = message.Sender,
+				T = message.Timestamp,
+				M = string.IsNullOrEmpty(message.Text) ? null : message.Text,
+				Te = message.EditTimestamp,
+				R = message.RepliedToId?.ToString(),
 
-		foreach (var grouping in includedMessages.GroupBy(static message => message.Channel)) {
-			var channelIdSnowflake = new Snowflake(grouping.Key);
-			var channelData = new Dictionary<Snowflake, ViewerJson.JsonMessage>();
+				A = message.Attachments.IsEmpty ? null : message.Attachments.Select(static attachment => {
+					var a = new ViewerJson.JsonMessageAttachment {
+						Url = attachment.DownloadUrl,
+						Name = Uri.TryCreate(attachment.NormalizedUrl, UriKind.Absolute, out var uri) ? Path.GetFileName(uri.LocalPath) : attachment.NormalizedUrl
+					};
 
-			foreach (var message in grouping) {
-				var messageIdSnowflake = new Snowflake(message.Id);
-				
-				channelData[messageIdSnowflake] = new ViewerJson.JsonMessage {
-					U = userIndices[message.Sender],
-					T = message.Timestamp,
-					M = string.IsNullOrEmpty(message.Text) ? null : message.Text,
-					Te = message.EditTimestamp,
-					R = message.RepliedToId?.ToString(),
-					
-					A = message.Attachments.IsEmpty ? null : message.Attachments.Select(static attachment => {
-						var a = new ViewerJson.JsonMessageAttachment {
-							Url = attachment.DownloadUrl,
-							Name = Uri.TryCreate(attachment.NormalizedUrl, UriKind.Absolute, out var uri) ? Path.GetFileName(uri.LocalPath) : attachment.NormalizedUrl
-						};
+					if (attachment is { Width: not null, Height: not null }) {
+						a.Width = attachment.Width;
+						a.Height = attachment.Height;
+					}
 
-						if (attachment is { Width: not null, Height: not null }) {
-							a.Width = attachment.Width;
-							a.Height = attachment.Height;
-						}
+					return a;
+				}).ToArray(),
 
-						return a;
-					}).ToArray(),
-					
-					E = message.Embeds.IsEmpty ? null : message.Embeds.Select(static embed => embed.Json).ToArray(),
-					
-					Re = message.Reactions.IsEmpty ? null : message.Reactions.Select(static reaction => new ViewerJson.JsonMessageReaction {
-						Id = reaction.EmojiId?.ToString(),
-						N = reaction.EmojiName,
-						A = reaction.EmojiFlags.HasFlag(EmojiFlags.Animated),
-						C = reaction.Count
-					}).ToArray()
-				};
-			}
+				E = message.Embeds.IsEmpty ? null : message.Embeds.Select(static embed => embed.Json).ToArray(),
 
-			data[channelIdSnowflake] = channelData;
+				Re = message.Reactions.IsEmpty ? null : message.Reactions.Select(static reaction => new ViewerJson.JsonMessageReaction {
+					Id = reaction.EmojiId?.ToString(),
+					N = reaction.EmojiName,
+					A = reaction.EmojiFlags.HasFlag(EmojiFlags.Animated),
+					C = reaction.Count
+				}).ToArray()
+			};
 		}
-
-		return data;
 	}
 }

app/Server/Database/Export/ViewerJsonMessageContext.cs

@@ -0,0 +1,11 @@
+using System.Text.Json.Serialization;
+
+namespace DHT.Server.Database.Export;
+
+[JsonSourceGenerationOptions(
+	Converters = [typeof(SnowflakeJsonSerializer)],
+	PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase,
+	GenerationMode = JsonSourceGenerationMode.Default
+)]
+[JsonSerializable(typeof(ViewerJson.JsonMessage))]
+sealed partial class ViewerJsonMessageContext : JsonSerializerContext;

app/Server/Database/Export/ViewerJsonMetadataContext.cs

@@ -7,5 +7,5 @@ namespace DHT.Server.Database.Export;
 	PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase,
 	GenerationMode = JsonSourceGenerationMode.Default
 )]
-[JsonSerializable(typeof(ViewerJson))]
-sealed partial class ViewerJsonContext : JsonSerializerContext;
+[JsonSerializable(typeof(ViewerJson.JsonMeta))]
+sealed partial class ViewerJsonMetadataContext : JsonSerializerContext;

app/Server/Database/IDatabaseFile.cs

@@ -7,6 +7,7 @@ namespace DHT.Server.Database;
 public interface IDatabaseFile : IAsyncDisposable {
 	string Path { get; }
 
+	ISettingsRepository Settings { get; }
 	IUserRepository Users { get; }
 	IServerRepository Servers { get; }
 	IChannelRepository Channels { get; }

app/Server/Database/Import/LegacyArchiveImport.cs

@@ -161,7 +161,7 @@ public static class LegacyArchiveImport {
 
 		var messagesObj = data.HasKey(channelIdStr) ? data.RequireObject(channelIdStr, DataPath) : (JsonElement?) null;
 		if (messagesObj == null) {
-			return Array.Empty<Message>();
+			return [];
 		}
 
 		return messagesObj.Value.EnumerateObject().Select(item => {

app/Server/Database/Repositories/IChannelRepository.cs

@@ -15,7 +15,7 @@ public interface IChannelRepository {
 	
 	Task<long> Count(CancellationToken cancellationToken = default);
 	
-	IAsyncEnumerable<Channel> Get();
+	IAsyncEnumerable<Channel> Get(CancellationToken cancellationToken = default);
 
 	internal sealed class Dummy : IChannelRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
@@ -28,7 +28,7 @@ public interface IChannelRepository {
 			return Task.FromResult(0L);
 		}
 
-		public IAsyncEnumerable<Channel> Get() {
+		public IAsyncEnumerable<Channel> Get(CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<Channel>();
 		}
 	}

app/Server/Database/Repositories/IDownloadRepository.cs

@@ -1,10 +1,10 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Reactive.Linq;
 using System.Threading;
 using System.Threading.Tasks;
-using DHT.Server.Data;
 using DHT.Server.Data.Aggregations;
 using DHT.Server.Data.Filters;
 using DHT.Server.Download;
@@ -14,7 +14,7 @@ namespace DHT.Server.Database.Repositories;
 public interface IDownloadRepository {
 	IObservable<long> TotalCount { get; }
 
-	Task AddDownload(DownloadWithData item);
+	Task AddDownload(Data.Download item, Stream? stream);
 
 	Task<long> Count(DownloadItemFilter filter, CancellationToken cancellationToken = default);
 	
@@ -22,9 +22,9 @@ public interface IDownloadRepository {
 	
 	IAsyncEnumerable<Data.Download> Get();
 
-	Task<DownloadWithData> HydrateWithData(Data.Download download);
-
-	Task<DownloadWithData?> GetSuccessfulDownloadWithData(string normalizedUrl);
+	Task<bool> GetDownloadData(string normalizedUrl, Func<Stream, Task> dataProcessor);
+	
+	Task<bool> GetSuccessfulDownloadWithData(string normalizedUrl, Func<Data.Download, Stream, CancellationToken, Task> dataProcessor, CancellationToken cancellationToken = default);
 
 	IAsyncEnumerable<DownloadItem> PullPendingDownloadItems(int count, DownloadItemFilter filter, CancellationToken cancellationToken = default);
 	
@@ -35,7 +35,7 @@ public interface IDownloadRepository {
 	internal sealed class Dummy : IDownloadRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
 
-		public Task AddDownload(DownloadWithData item) {
+		public Task AddDownload(Data.Download item, Stream? stream) {
 			return Task.CompletedTask;
 		}
 
@@ -51,12 +51,12 @@ public interface IDownloadRepository {
 			return AsyncEnumerable.Empty<Data.Download>();
 		}
 
-		public Task<DownloadWithData> HydrateWithData(Data.Download download) {
-			return Task.FromResult(new DownloadWithData(download, Data: null));
+		public Task<bool> GetDownloadData(string normalizedUrl, Func<Stream, Task> dataProcessor) {
+			return Task.FromResult(false);
 		}
 
-		public Task<DownloadWithData?> GetSuccessfulDownloadWithData(string normalizedUrl) {
-			return Task.FromResult<DownloadWithData?>(null);
+		public Task<bool> GetSuccessfulDownloadWithData(string normalizedUrl, Func<Data.Download, Stream, CancellationToken, Task> dataProcessor, CancellationToken cancellationToken) {
+			return Task.FromResult(false);
 		}
 
 		public IAsyncEnumerable<DownloadItem> PullPendingDownloadItems(int count, DownloadItemFilter filter, CancellationToken cancellationToken) {

app/Server/Database/Repositories/IMessageRepository.cs

@@ -16,7 +16,7 @@ public interface IMessageRepository {
 	
 	Task<long> Count(MessageFilter? filter = null, CancellationToken cancellationToken = default);
 	
-	IAsyncEnumerable<Message> Get(MessageFilter? filter = null);
+	IAsyncEnumerable<Message> Get(MessageFilter? filter = null, CancellationToken cancellationToken = default);
 	
 	IAsyncEnumerable<ulong> GetIds(MessageFilter? filter = null);
 	
@@ -33,7 +33,7 @@ public interface IMessageRepository {
 			return Task.FromResult(0L);
 		}
 
-		public IAsyncEnumerable<Message> Get(MessageFilter? filter) {
+		public IAsyncEnumerable<Message> Get(MessageFilter? filter, CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<Message>();
 		}
 

app/Server/Database/Repositories/IServerRepository.cs

@@ -14,7 +14,7 @@ public interface IServerRepository {
 	
 	Task<long> Count(CancellationToken cancellationToken = default);
 	
-	IAsyncEnumerable<Data.Server> Get();
+	IAsyncEnumerable<Data.Server> Get(CancellationToken cancellationToken = default);
 
 	internal sealed class Dummy : IServerRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
@@ -27,7 +27,7 @@ public interface IServerRepository {
 			return Task.FromResult(0L);
 		}
 
-		public IAsyncEnumerable<Data.Server> Get() {
+		public IAsyncEnumerable<Data.Server> Get(CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<Data.Server>();
 		}
 	}

app/Server/Database/Repositories/ISettingsRepository.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Threading.Tasks;
+using DHT.Server.Data.Settings;
+
+namespace DHT.Server.Database.Repositories;
+
+public interface ISettingsRepository {
+	Task Set<T>(SettingsKey<T> key, T value);
+	
+	Task Set(Func<ISetter, Task> setter);
+	
+	Task<T?> Get<T>(SettingsKey<T> key, T? defaultValue);
+	
+	interface ISetter {
+		Task Set<T>(SettingsKey<T> key, T value);
+	}
+	
+	internal sealed class Dummy : ISettingsRepository {
+		public Task Set<T>(SettingsKey<T> key, T value) {
+			return Task.CompletedTask;
+		}
+
+		public Task Set(Func<ISetter, Task> setter) {
+			return Task.CompletedTask;
+		}
+
+		public Task<T?> Get<T>(SettingsKey<T> key, T? defaultValue) {
+			return Task.FromResult(defaultValue);
+		}
+	}
+}

app/Server/Database/Repositories/IUserRepository.cs

@@ -15,7 +15,7 @@ public interface IUserRepository {
 	
 	Task<long> Count(CancellationToken cancellationToken = default);
 	
-	IAsyncEnumerable<User> Get();
+	IAsyncEnumerable<User> Get(CancellationToken cancellationToken = default);
 
 	internal sealed class Dummy : IUserRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
@@ -28,7 +28,7 @@ public interface IUserRepository {
 			return Task.FromResult(0L);
 		}
 
-		public IAsyncEnumerable<User> Get() {
+		public IAsyncEnumerable<User> Get(CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<User>();
 		}
 	}

app/Server/Database/Sqlite/Repositories/SqliteChannelRepository.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
@@ -19,9 +20,9 @@ sealed class SqliteChannelRepository : BaseSqliteRepository, IChannelRepository
 	}
 
 	public async Task Add(IReadOnlyList<Channel> channels) {
-		await using var conn = await pool.Take();
-
-		await using (var tx = await conn.BeginTransactionAsync()) {
+		await using (var conn = await pool.Take()) {
+			await conn.BeginTransactionAsync();
+			
 			await using var cmd = conn.Upsert("channels", [
 				("id", SqliteType.Integer),
 				("server", SqliteType.Integer),
@@ -43,7 +44,7 @@ sealed class SqliteChannelRepository : BaseSqliteRepository, IChannelRepository
 				await cmd.ExecuteNonQueryAsync();
 			}
 
-			await tx.CommitAsync();
+			await conn.CommitTransactionAsync();
 		}
 
 		UpdateTotalCount();
@@ -54,13 +55,13 @@ sealed class SqliteChannelRepository : BaseSqliteRepository, IChannelRepository
 		return await conn.ExecuteReaderAsync("SELECT COUNT(*) FROM channels", static reader => reader?.GetInt64(0) ?? 0L, cancellationToken);
 	}
 
-	public async IAsyncEnumerable<Channel> Get() {
+	public async IAsyncEnumerable<Channel> Get([EnumeratorCancellation] CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 
 		await using var cmd = conn.Command("SELECT id, server, name, parent_id, position, topic, nsfw FROM channels");
-		await using var reader = await cmd.ExecuteReaderAsync();
+		await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
 
-		while (await reader.ReadAsync()) {
+		while (await reader.ReadAsync(cancellationToken)) {
 			yield return new Channel {
 				Id = reader.GetUint64(0),
 				Server = reader.GetUint64(1),

app/Server/Database/Sqlite/Repositories/SqliteDownloadRepository.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
@@ -14,18 +15,12 @@ using Microsoft.Data.Sqlite;
 
 namespace DHT.Server.Database.Sqlite.Repositories;
 
-sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepository {
+sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRepository(Log), IDownloadRepository {
 	private static readonly Log Log = Log.ForType<SqliteDownloadRepository>();
-	
-	private readonly SqliteConnectionPool pool;
-
-	public SqliteDownloadRepository(SqliteConnectionPool pool) : base(Log) {
-		this.pool = pool;
-	}
 
 	internal sealed class NewDownloadCollector : IAsyncDisposable {
 		private readonly SqliteDownloadRepository repository;
-		private bool hasAdded = false;
+		private bool hasChanged = false;
 
 		private readonly SqliteCommand metadataCmd;
 
@@ -36,7 +31,16 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 				"""
 				INSERT INTO download_metadata (normalized_url, download_url, status, type, size)
 				VALUES (:normalized_url, :download_url, :status, :type, :size)
-				ON CONFLICT DO NOTHING
+				ON CONFLICT (normalized_url)
+				DO UPDATE SET
+					download_url = excluded.download_url,
+					type = IFNULL(excluded.type, type),
+					size = IFNULL(excluded.size, size)
+				WHERE status != :success
+				  AND (download_url != excluded.download_url
+				    OR (excluded.type IS NOT NULL AND type IS NOT excluded.type)
+				    OR (excluded.size IS NOT NULL AND size IS NOT excluded.size)
+				  )
 				"""
 			);
 			metadataCmd.Add(":normalized_url", SqliteType.Text);
@@ -44,6 +48,7 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 			metadataCmd.Add(":status", SqliteType.Integer);
 			metadataCmd.Add(":type", SqliteType.Text);
 			metadataCmd.Add(":size", SqliteType.Integer);
+			metadataCmd.AddAndSet(":success", SqliteType.Integer, (int) DownloadStatus.Success);
 		}
 
 		public async Task Add(Data.Download download) {
@@ -52,11 +57,11 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 			metadataCmd.Set(":status", (int) download.Status);
 			metadataCmd.Set(":type", download.Type);
 			metadataCmd.Set(":size", download.Size);
-			hasAdded |= await metadataCmd.ExecuteNonQueryAsync() > 0;
+			hasChanged |= await metadataCmd.ExecuteNonQueryAsync() > 0;
 		}
 
 		public void OnCommitted() {
-			if (hasAdded) {
+			if (hasChanged) {
 				repository.UpdateTotalCount();
 			}
 		}
@@ -66,12 +71,10 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 		}
 	}
 
-	public async Task AddDownload(DownloadWithData item) {
-		var (download, data) = item;
-
+	public async Task AddDownload(Data.Download item, Stream? stream) {
 		await using (var conn = await pool.Take()) {
-			var tx = await conn.BeginTransactionAsync();
-
+			await conn.BeginTransactionAsync();
+			
 			await using var metadataCmd = conn.Upsert("download_metadata", [
 				("normalized_url", SqliteType.Text),
 				("download_url", SqliteType.Text),
@@ -80,30 +83,38 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 				("size", SqliteType.Integer),
 			]);
 
-			metadataCmd.Set(":normalized_url", download.NormalizedUrl);
-			metadataCmd.Set(":download_url", download.DownloadUrl);
-			metadataCmd.Set(":status", (int) download.Status);
-			metadataCmd.Set(":type", download.Type);
-			metadataCmd.Set(":size", download.Size);
+			metadataCmd.Set(":normalized_url", item.NormalizedUrl);
+			metadataCmd.Set(":download_url", item.DownloadUrl);
+			metadataCmd.Set(":status", (int) item.Status);
+			metadataCmd.Set(":type", item.Type);
+			metadataCmd.Set(":size", item.Size);
 			await metadataCmd.ExecuteNonQueryAsync();
 
-			if (data == null) {
+			if (stream == null) {
 				await using var deleteBlobCmd = conn.Command("DELETE FROM download_blobs WHERE normalized_url = :normalized_url");
-				deleteBlobCmd.AddAndSet(":normalized_url", SqliteType.Text, download.NormalizedUrl);
+				deleteBlobCmd.AddAndSet(":normalized_url", SqliteType.Text, item.NormalizedUrl);
 				await deleteBlobCmd.ExecuteNonQueryAsync();
 			}
 			else {
-				await using var upsertBlobCmd = conn.Upsert("download_blobs", [
-					("normalized_url", SqliteType.Text),
-					("blob", SqliteType.Blob)
-				]);
+				await using var upsertBlobCmd = conn.Command(
+					"""
+					INSERT INTO download_blobs (normalized_url, blob)
+					VALUES (:normalized_url, ZEROBLOB(:blob_length))
+					ON CONFLICT (normalized_url)
+					DO UPDATE SET blob = excluded.blob
+					RETURNING rowid
+					"""
+				);
+				
+				upsertBlobCmd.AddAndSet(":normalized_url", SqliteType.Text, item.NormalizedUrl);
+				upsertBlobCmd.AddAndSet(":blob_length", SqliteType.Integer, item.Size);
+				long rowid = await upsertBlobCmd.ExecuteLongScalarAsync();
 
-				upsertBlobCmd.Set(":normalized_url", download.NormalizedUrl);
-				upsertBlobCmd.Set(":blob", data);
-				await upsertBlobCmd.ExecuteNonQueryAsync();
+				await using var blob = new SqliteBlob(conn.InnerConnection, "download_blobs", "blob", rowid);
+				await stream.CopyToAsync(blob);
 			}
 
-			await tx.CommitAsync();
+			await conn.CommitTransactionAsync();
 		}
 
 		UpdateTotalCount();
@@ -187,24 +198,35 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 		}
 	}
 
-	public async Task<DownloadWithData> HydrateWithData(Data.Download download) {
+	public async Task<bool> GetDownloadData(string normalizedUrl, Func<Stream, Task> dataProcessor) {
 		await using var conn = await pool.Take();
 
-		await using var cmd = conn.Command("SELECT blob FROM download_blobs WHERE normalized_url = :url");
-		cmd.AddAndSet(":url", SqliteType.Text, download.NormalizedUrl);
-
-		await using var reader = await cmd.ExecuteReaderAsync();
-		var data = await reader.ReadAsync() && !reader.IsDBNull(0) ? (byte[]) reader["blob"] : null;
+		await using var cmd = conn.Command("SELECT rowid FROM download_blobs WHERE normalized_url = :normalized_url");
+		cmd.AddAndSet(":normalized_url", SqliteType.Text, normalizedUrl);
 		
-		return new DownloadWithData(download, data);
+		long rowid;
+		
+		await using (var reader = await cmd.ExecuteReaderAsync()) {
+			if (!await reader.ReadAsync()) {
+				return false;
+			}
+
+			rowid = reader.GetInt64(0);
+		}
+		
+		await using (var blob = new SqliteBlob(conn.InnerConnection, "download_blobs", "blob", rowid, readOnly: true)) {
+			await dataProcessor(blob);
+		}
+
+		return true;
 	}
 
-	public async Task<DownloadWithData?> GetSuccessfulDownloadWithData(string normalizedUrl) {
+	public async Task<bool> GetSuccessfulDownloadWithData(string normalizedUrl, Func<Data.Download, Stream, CancellationToken, Task> dataProcessor, CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 
 		await using var cmd = conn.Command(
 			"""
-			SELECT dm.download_url, dm.type, db.blob FROM download_metadata dm
+			SELECT dm.download_url, dm.type, db.rowid FROM download_metadata dm
 			JOIN download_blobs db ON dm.normalized_url = db.normalized_url
 			WHERE dm.normalized_url = :normalized_url AND dm.status = :success IS NOT NULL
 			"""
@@ -213,19 +235,25 @@ sealed class SqliteDownloadRepository : BaseSqliteRepository, IDownloadRepositor
 		cmd.AddAndSet(":normalized_url", SqliteType.Text, normalizedUrl);
 		cmd.AddAndSet(":success", SqliteType.Integer, (int) DownloadStatus.Success);
 
-		await using var reader = await cmd.ExecuteReaderAsync();
+		string downloadUrl;
+		string? type;
+		long rowid;
+		
+		await using (var reader = await cmd.ExecuteReaderAsync(cancellationToken)) {
+			if (!await reader.ReadAsync(cancellationToken)) {
+				return false;
+			}
 
-		if (!await reader.ReadAsync()) {
-			return null;
+			downloadUrl = reader.GetString(0);
+			type = reader.IsDBNull(1) ? null : reader.GetString(1);
+			rowid = reader.GetInt64(2);
+		}
+		
+		await using (var blob = new SqliteBlob(conn.InnerConnection, "download_blobs", "blob", rowid, readOnly: true)) {
+			await dataProcessor(new Data.Download(normalizedUrl, downloadUrl, DownloadStatus.Success, type, (ulong) blob.Length), blob, cancellationToken);
 		}
 
-		var downloadUrl = reader.GetString(0);
-		var type = reader.IsDBNull(1) ? null : reader.GetString(1);
-		var data = (byte[]) reader[2];
-		var size = (ulong) data.LongLength;
-		var download = new Data.Download(normalizedUrl, downloadUrl, DownloadStatus.Success, type, size);
-		
-		return new DownloadWithData(download, data);
+		return true;
 	}
 
 	public async IAsyncEnumerable<DownloadItem> PullPendingDownloadItems(int count, DownloadItemFilter filter, [EnumeratorCancellation] CancellationToken cancellationToken) {

app/Server/Database/Sqlite/Repositories/SqliteMessageRepository.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
@@ -13,16 +14,8 @@ using Microsoft.Data.Sqlite;
 
 namespace DHT.Server.Database.Sqlite.Repositories;
 
-sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository {
+sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRepository downloads) : BaseSqliteRepository(Log), IMessageRepository {
 	private static readonly Log Log = Log.ForType<SqliteMessageRepository>();
-	
-	private readonly SqliteConnectionPool pool;
-	private readonly SqliteDownloadRepository downloads;
-
-	public SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRepository downloads) : base(Log) {
-		this.pool = pool;
-		this.downloads = downloads;
-	}
 
 	public async Task Add(IReadOnlyList<Message> messages) {
 		if (messages.Count == 0) {
@@ -39,7 +32,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 		}
 
 		await using (var conn = await pool.Take()) {
-			await using var tx = await conn.BeginTransactionAsync();
+			await conn.BeginTransactionAsync();
 
 			await using var messageCmd = conn.Upsert("messages", [
 				("message_id", SqliteType.Integer),
@@ -49,25 +42,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				("timestamp", SqliteType.Integer)
 			]);
 
-			await using var deleteEditTimestampCmd = DeleteByMessageId(conn, "edit_timestamps");
-			await using var deleteRepliedToCmd = DeleteByMessageId(conn, "replied_to");
-
-			await using var deleteAttachmentsCmd = DeleteByMessageId(conn, "attachments");
-			await using var deleteEmbedsCmd = DeleteByMessageId(conn, "embeds");
-			await using var deleteReactionsCmd = DeleteByMessageId(conn, "reactions");
-
-			await using var editTimestampCmd = conn.Insert("edit_timestamps", [
-				("message_id", SqliteType.Integer),
-				("edit_timestamp", SqliteType.Integer)
-			]);
-
-			await using var repliedToCmd = conn.Insert("replied_to", [
-				("message_id", SqliteType.Integer),
-				("replied_to_id", SqliteType.Integer)
-			]);
-
-			await using var attachmentCmd = conn.Insert("attachments", [
-				("message_id", SqliteType.Integer),
+			await using var attachmentCmd = conn.Upsert("attachments", [
 				("attachment_id", SqliteType.Integer),
 				("name", SqliteType.Text),
 				("type", SqliteType.Text),
@@ -78,19 +53,41 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				("height", SqliteType.Integer)
 			]);
 
-			await using var embedCmd = conn.Insert("embeds", [
+			await using var deleteMessageEditTimestampCmd = DeleteByMessageId(conn, "message_edit_timestamps");
+			await using var deleteMessageRepliedToCmd = DeleteByMessageId(conn, "message_replied_to");
+
+			await using var deleteMessageAttachmentsCmd = DeleteByMessageId(conn, "message_attachments");
+			await using var deleteMessageEmbedsCmd = DeleteByMessageId(conn, "message_embeds");
+			await using var deleteMessageReactionsCmd = DeleteByMessageId(conn, "message_reactions");
+
+			await using var messageEditTimestampCmd = conn.Insert("message_edit_timestamps", [
+				("message_id", SqliteType.Integer),
+				("edit_timestamp", SqliteType.Integer)
+			]);
+
+			await using var messageRepliedToCmd = conn.Insert("message_replied_to", [
+				("message_id", SqliteType.Integer),
+				("replied_to_id", SqliteType.Integer)
+			]);
+
+			await using var messageAttachmentCmd = conn.Insert("message_attachments", [
+				("message_id", SqliteType.Integer),
+				("attachment_id", SqliteType.Integer)
+			]);
+
+			await using var messageEmbedCmd = conn.Insert("message_embeds", [
 				("message_id", SqliteType.Integer),
 				("json", SqliteType.Text)
 			]);
 
-			await using var reactionCmd = conn.Insert("reactions", [
+			await using var messageReactionCmd = conn.Insert("message_reactions", [
 				("message_id", SqliteType.Integer),
 				("emoji_id", SqliteType.Integer),
 				("emoji_name", SqliteType.Text),
 				("emoji_flags", SqliteType.Integer),
 				("count", SqliteType.Integer)
 			]);
-			
+
 			await using var downloadCollector = new SqliteDownloadRepository.NewDownloadCollector(downloads, conn);
 
 			foreach (var message in messages) {
@@ -103,29 +100,30 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				messageCmd.Set(":timestamp", message.Timestamp);
 				await messageCmd.ExecuteNonQueryAsync();
 
-				await ExecuteDeleteByMessageId(deleteEditTimestampCmd, messageId);
-				await ExecuteDeleteByMessageId(deleteRepliedToCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageEditTimestampCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageRepliedToCmd, messageId);
 
-				await ExecuteDeleteByMessageId(deleteAttachmentsCmd, messageId);
-				await ExecuteDeleteByMessageId(deleteEmbedsCmd, messageId);
-				await ExecuteDeleteByMessageId(deleteReactionsCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageAttachmentsCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageEmbedsCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageReactionsCmd, messageId);
 
 				if (message.EditTimestamp is {} timestamp) {
-					editTimestampCmd.Set(":message_id", messageId);
-					editTimestampCmd.Set(":edit_timestamp", timestamp);
-					await editTimestampCmd.ExecuteNonQueryAsync();
+					messageEditTimestampCmd.Set(":message_id", messageId);
+					messageEditTimestampCmd.Set(":edit_timestamp", timestamp);
+					await messageEditTimestampCmd.ExecuteNonQueryAsync();
 				}
 
 				if (message.RepliedToId is {} repliedToId) {
-					repliedToCmd.Set(":message_id", messageId);
-					repliedToCmd.Set(":replied_to_id", repliedToId);
-					await repliedToCmd.ExecuteNonQueryAsync();
+					messageRepliedToCmd.Set(":message_id", messageId);
+					messageRepliedToCmd.Set(":replied_to_id", repliedToId);
+					await messageRepliedToCmd.ExecuteNonQueryAsync();
 				}
 
 				if (!message.Attachments.IsEmpty) {
 					foreach (var attachment in message.Attachments) {
-						attachmentCmd.Set(":message_id", messageId);
-						attachmentCmd.Set(":attachment_id", attachment.Id);
+						object attachmentId = attachment.Id;
+
+						attachmentCmd.Set(":attachment_id", attachmentId);
 						attachmentCmd.Set(":name", attachment.Name);
 						attachmentCmd.Set(":type", attachment.Type);
 						attachmentCmd.Set(":normalized_url", attachment.NormalizedUrl);
@@ -134,16 +132,20 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 						attachmentCmd.Set(":width", attachment.Width);
 						attachmentCmd.Set(":height", attachment.Height);
 						await attachmentCmd.ExecuteNonQueryAsync();
-						
+
+						messageAttachmentCmd.Set(":message_id", messageId);
+						messageAttachmentCmd.Set(":attachment_id", attachmentId);
+						await messageAttachmentCmd.ExecuteNonQueryAsync();
+
 						await downloadCollector.Add(DownloadLinkExtractor.FromAttachment(attachment));
 					}
 				}
 
 				if (!message.Embeds.IsEmpty) {
 					foreach (var embed in message.Embeds) {
-						embedCmd.Set(":message_id", messageId);
-						embedCmd.Set(":json", embed.Json);
-						await embedCmd.ExecuteNonQueryAsync();
+						messageEmbedCmd.Set(":message_id", messageId);
+						messageEmbedCmd.Set(":json", embed.Json);
+						await messageEmbedCmd.ExecuteNonQueryAsync();
 
 						if (DownloadLinkExtractor.TryFromEmbedJson(embed.Json) is {} download) {
 							await downloadCollector.Add(download);
@@ -153,12 +155,12 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 
 				if (!message.Reactions.IsEmpty) {
 					foreach (var reaction in message.Reactions) {
-						reactionCmd.Set(":message_id", messageId);
-						reactionCmd.Set(":emoji_id", reaction.EmojiId);
-						reactionCmd.Set(":emoji_name", reaction.EmojiName);
-						reactionCmd.Set(":emoji_flags", (int) reaction.EmojiFlags);
-						reactionCmd.Set(":count", reaction.Count);
-						await reactionCmd.ExecuteNonQueryAsync();
+						messageReactionCmd.Set(":message_id", messageId);
+						messageReactionCmd.Set(":emoji_id", reaction.EmojiId);
+						messageReactionCmd.Set(":emoji_name", reaction.EmojiName);
+						messageReactionCmd.Set(":emoji_flags", (int) reaction.EmojiFlags);
+						messageReactionCmd.Set(":count", reaction.Count);
+						await messageReactionCmd.ExecuteNonQueryAsync();
 
 						if (reaction.EmojiId is {} emojiId) {
 							await downloadCollector.Add(DownloadLinkExtractor.FromEmoji(emojiId, reaction.EmojiFlags));
@@ -167,7 +169,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				}
 			}
 
-			await tx.CommitAsync();
+			await conn.CommitTransactionAsync();
 			downloadCollector.OnCommitted();
 		}
 
@@ -177,17 +179,17 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 	public override Task<long> Count(CancellationToken cancellationToken) {
 		return Count(filter: null, cancellationToken);
 	}
-	
+
 	public async Task<long> Count(MessageFilter? filter, CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 		return await conn.ExecuteReaderAsync("SELECT COUNT(*) FROM messages" + filter.GenerateConditions().BuildWhereClause(), static reader => reader?.GetInt64(0) ?? 0L, cancellationToken);
 	}
 
-	private sealed class MesageToManyCommand<T> : IAsyncDisposable {
+	private sealed class MessageToManyCommand<T> : IAsyncDisposable {
 		private readonly SqliteCommand cmd;
 		private readonly Func<SqliteDataReader, T> readItem;
 
-		public MesageToManyCommand(ISqliteConnection conn, string sql, Func<SqliteDataReader, T> readItem) {
+		public MessageToManyCommand(ISqliteConnection conn, string sql, Func<SqliteDataReader, T> readItem) {
 			this.cmd = conn.Command(sql);
 			this.cmd.Add(":message_id", SqliteType.Integer);
 
@@ -213,17 +215,18 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 		}
 	}
 
-	public async IAsyncEnumerable<Message> Get(MessageFilter? filter) {
+	public async IAsyncEnumerable<Message> Get(MessageFilter? filter, [EnumeratorCancellation] CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 
 		const string AttachmentSql =
 			"""
 			SELECT attachment_id, name, type, normalized_url, download_url, size, width, height
 			FROM attachments
-			WHERE message_id = :message_id
+			JOIN message_attachments USING (attachment_id)
+			WHERE message_attachments.message_id = :message_id
 			""";
 
-		await using var attachmentCmd = new MesageToManyCommand<Attachment>(conn, AttachmentSql, static reader => new Attachment {
+		await using var attachmentCmd = new MessageToManyCommand<Attachment>(conn, AttachmentSql, static reader => new Attachment {
 			Id = reader.GetUint64(0),
 			Name = reader.GetString(1),
 			Type = reader.IsDBNull(2) ? null : reader.GetString(2),
@@ -237,22 +240,22 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 		const string EmbedSql =
 			"""
 			SELECT json
-			FROM embeds
+			FROM message_embeds
 			WHERE message_id = :message_id
 			""";
 
-		await using var embedCmd = new MesageToManyCommand<Embed>(conn, EmbedSql, static reader => new Embed {
+		await using var embedCmd = new MessageToManyCommand<Embed>(conn, EmbedSql, static reader => new Embed {
 			Json = reader.GetString(0)
 		});
 
 		const string ReactionSql =
 			"""
 			SELECT emoji_id, emoji_name, emoji_flags, count
-			FROM reactions
+			FROM message_reactions
 			WHERE message_id = :message_id
 			""";
 
-		await using var reactionsCmd = new MesageToManyCommand<Reaction>(conn, ReactionSql, static reader => new Reaction {
+		await using var reactionsCmd = new MessageToManyCommand<Reaction>(conn, ReactionSql, static reader => new Reaction {
 			EmojiId = reader.IsDBNull(0) ? null : reader.GetUint64(0),
 			EmojiName = reader.IsDBNull(1) ? null : reader.GetString(1),
 			EmojiFlags = (EmojiFlags) reader.GetInt16(2),
@@ -261,17 +264,17 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 
 		await using var messageCmd = conn.Command(
 			$"""
-			 SELECT m.message_id, m.sender_id, m.channel_id, m.text, m.timestamp, et.edit_timestamp, rt.replied_to_id
+			 SELECT m.message_id, m.sender_id, m.channel_id, m.text, m.timestamp, met.edit_timestamp, mrt.replied_to_id
 			 FROM messages m
-			 LEFT JOIN edit_timestamps et ON m.message_id = et.message_id
-			 LEFT JOIN replied_to rt ON m.message_id = rt.message_id
+			 LEFT JOIN message_edit_timestamps met ON m.message_id = met.message_id
+			 LEFT JOIN message_replied_to mrt ON m.message_id = mrt.message_id
 			 {filter.GenerateConditions("m").BuildWhereClause()}
 			 """
 		);
 
-		await using var reader = await messageCmd.ExecuteReaderAsync();
+		await using var reader = await messageCmd.ExecuteReaderAsync(cancellationToken);
 
-		while (await reader.ReadAsync()) {
+		while (await reader.ReadAsync(cancellationToken)) {
 			ulong messageId = reader.GetUint64(0);
 
 			yield return new Message {
@@ -291,7 +294,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 
 	public async IAsyncEnumerable<ulong> GetIds(MessageFilter? filter) {
 		await using var conn = await pool.Take();
-		
+
 		await using var cmd = conn.Command("SELECT message_id FROM messages" + filter.GenerateConditions().BuildWhereClause());
 		await using var reader = await cmd.ExecuteReaderAsync();
 

app/Server/Database/Sqlite/Repositories/SqliteServerRepository.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
@@ -19,9 +20,9 @@ sealed class SqliteServerRepository : BaseSqliteRepository, IServerRepository {
 	}
 
 	public async Task Add(IReadOnlyList<Data.Server> servers) {
-		await using var conn = await pool.Take();
-
-		await using (var tx = await conn.BeginTransactionAsync()) {
+		await using (var conn = await pool.Take()) {
+			await conn.BeginTransactionAsync();
+			
 			await using var cmd = conn.Upsert("servers", [
 				("id", SqliteType.Integer),
 				("name", SqliteType.Text),
@@ -35,7 +36,7 @@ sealed class SqliteServerRepository : BaseSqliteRepository, IServerRepository {
 				await cmd.ExecuteNonQueryAsync();
 			}
 
-			await tx.CommitAsync();
+			await conn.CommitTransactionAsync();
 		}
 
 		UpdateTotalCount();
@@ -46,13 +47,13 @@ sealed class SqliteServerRepository : BaseSqliteRepository, IServerRepository {
 		return await conn.ExecuteReaderAsync("SELECT COUNT(*) FROM servers", static reader => reader?.GetInt64(0) ?? 0L, cancellationToken);
 	}
 
-	public async IAsyncEnumerable<Data.Server> Get() {
+	public async IAsyncEnumerable<Data.Server> Get([EnumeratorCancellation] CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 
 		await using var cmd = conn.Command("SELECT id, name, type FROM servers");
-		await using var reader = await cmd.ExecuteReaderAsync();
+		await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
 
-		while (await reader.ReadAsync()) {
+		while (await reader.ReadAsync(cancellationToken)) {
 			yield return new Data.Server {
 				Id = reader.GetUint64(0),
 				Name = reader.GetString(1),

app/Server/Database/Sqlite/Repositories/SqliteSettingsRepository.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Threading.Tasks;
+using DHT.Server.Data.Settings;
+using DHT.Server.Database.Repositories;
+using DHT.Server.Database.Sqlite.Utils;
+using Microsoft.Data.Sqlite;
+
+namespace DHT.Server.Database.Sqlite.Repositories;
+
+sealed class SqliteSettingsRepository(SqliteConnectionPool pool) : ISettingsRepository {
+	public Task Set<T>(SettingsKey<T> key, T value) {
+		return Set(setter => setter.Set(key, value));
+	}
+
+	public async Task Set(Func<ISettingsRepository.ISetter, Task> setter) {
+		await using var conn = await pool.Take();
+		await conn.BeginTransactionAsync();
+		
+		await using var cmd = conn.Command(
+			"""
+			INSERT INTO metadata (key, value)
+			VALUES (:key, :value)
+			ON CONFLICT (key)
+			DO UPDATE SET value = excluded.value
+			"""
+		);
+
+		cmd.Add(":key", SqliteType.Text);
+		cmd.Add(":value", SqliteType.Text);
+		
+		await setter(new Setter(cmd));
+
+		await cmd.ExecuteNonQueryAsync();
+		await conn.CommitTransactionAsync();
+	}
+	
+	private sealed class Setter(SqliteCommand cmd) : ISettingsRepository.ISetter {
+		public async Task Set<T>(SettingsKey<T> key, T value) {
+			cmd.Set(":key", key.Key);
+			cmd.Set(":value", key.ToString(value));
+			await cmd.ExecuteNonQueryAsync();
+		}
+	}
+
+	public async Task<T?> Get<T>(SettingsKey<T> key, T? defaultValue) {
+		string? value;
+		
+		await using (var conn = await pool.Take()) {
+			await using var cmd = conn.Command("SELECT value FROM metadata WHERE key = :key");
+			cmd.AddAndSet(":key", SqliteType.Text, key.Key);
+
+			await using var reader = await cmd.ExecuteReaderAsync();
+			value = await reader.ReadAsync() ? reader.GetString(0) : null;
+		}
+
+		return value != null && key.FromString(value, out var convertedValue) ? convertedValue : defaultValue;
+	}
+}

app/Server/Database/Sqlite/Repositories/SqliteUserRepository.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
@@ -23,11 +24,12 @@ sealed class SqliteUserRepository : BaseSqliteRepository, IUserRepository {
 
 	public async Task Add(IReadOnlyList<User> users) {
 		await using (var conn = await pool.Take()) {
-			await using var tx = await conn.BeginTransactionAsync();
+			await conn.BeginTransactionAsync();
 
 			await using var cmd = conn.Upsert("users", [
 				("id", SqliteType.Integer),
 				("name", SqliteType.Text),
+				("display_name", SqliteType.Text),
 				("avatar_url", SqliteType.Text),
 				("discriminator", SqliteType.Text)
 			]);
@@ -37,6 +39,7 @@ sealed class SqliteUserRepository : BaseSqliteRepository, IUserRepository {
 			foreach (var user in users) {
 				cmd.Set(":id", user.Id);
 				cmd.Set(":name", user.Name);
+				cmd.Set(":display_name", user.DisplayName);
 				cmd.Set(":avatar_url", user.AvatarUrl);
 				cmd.Set(":discriminator", user.Discriminator);
 				await cmd.ExecuteNonQueryAsync();
@@ -46,7 +49,7 @@ sealed class SqliteUserRepository : BaseSqliteRepository, IUserRepository {
 				}
 			}
 
-			await tx.CommitAsync();
+			await conn.CommitTransactionAsync();
 			downloadCollector.OnCommitted();
 		}
 
@@ -58,18 +61,19 @@ sealed class SqliteUserRepository : BaseSqliteRepository, IUserRepository {
 		return await conn.ExecuteReaderAsync("SELECT COUNT(*) FROM users", static reader => reader?.GetInt64(0) ?? 0L, cancellationToken);
 	}
 
-	public async IAsyncEnumerable<User> Get() {
+	public async IAsyncEnumerable<User> Get([EnumeratorCancellation] CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 
-		await using var cmd = conn.Command("SELECT id, name, avatar_url, discriminator FROM users");
-		await using var reader = await cmd.ExecuteReaderAsync();
+		await using var cmd = conn.Command("SELECT id, name, display_name, avatar_url, discriminator FROM users");
+		await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
 
-		while (await reader.ReadAsync()) {
+		while (await reader.ReadAsync(cancellationToken)) {
 			yield return new User {
 				Id = reader.GetUint64(0),
 				Name = reader.GetString(1),
-				AvatarUrl = reader.IsDBNull(2) ? null : reader.GetString(2),
-				Discriminator = reader.IsDBNull(3) ? null : reader.GetString(3),
+				DisplayName = reader.IsDBNull(2) ? null : reader.GetString(2),
+				AvatarUrl = reader.IsDBNull(3) ? null : reader.GetString(3),
+				Discriminator = reader.IsDBNull(4) ? null : reader.GetString(4),
 			};
 		}
 	}

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo3.cs

@@ -8,7 +8,10 @@ sealed class SqliteSchemaUpgradeTo3 : ISchemaUpgrade {
 		await reporter.MainWork("Applying schema changes...", 0, 1);
 
 		await SqliteSchema.CreateMessageEditTimestampTable(conn);
+		await conn.ExecuteAsync("ALTER TABLE message_edit_timestamps RENAME TO edit_timestamps");
+		
 		await SqliteSchema.CreateMessageRepliedToTable(conn);
+		await conn.ExecuteAsync("ALTER TABLE message_replied_to RENAME TO replied_to");
 
 		await conn.ExecuteAsync("""
 		                        INSERT INTO edit_timestamps (message_id, edit_timestamp)

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo6.cs

@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.Data.Common;
 using System.Threading.Tasks;
 using DHT.Server.Database.Sqlite.Utils;
 using DHT.Server.Download;
@@ -23,7 +22,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 		await conn.ExecuteAsync("ALTER TABLE attachments RENAME COLUMN url TO normalized_url");
 		await conn.ExecuteAsync("ALTER TABLE downloads RENAME COLUMN url TO normalized_url");
 	}
-	
+
 	private async Task NormalizeAttachmentUrls(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
 		await reporter.SubWork("Preparing attachments...", 0, 0);
 
@@ -39,7 +38,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 			}
 		}
 
-		await using var tx = await conn.BeginTransactionAsync();
+		await conn.BeginTransactionAsync();
 
 		int totalUrls = normalizedUrls.Count;
 		int processedUrls = -1;
@@ -61,7 +60,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 
 		await reporter.SubWork("Updating URLs...", totalUrls, totalUrls);
 
-		await tx.CommitAsync();
+		await conn.CommitTransactionAsync();
 	}
 
 	private async Task NormalizeDownloadUrls(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
@@ -84,26 +83,23 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 		}
 
 		await conn.ExecuteAsync("PRAGMA cache_size = -20000");
+		await conn.BeginTransactionAsync();
+		
+		await reporter.SubWork("Deleting duplicates...", 0, 0);
 
-		DbTransaction tx;
-
-		await using (tx = await conn.BeginTransactionAsync()) {
-			await reporter.SubWork("Deleting duplicates...", 0, 0);
-
-			await using (var deleteCmd = conn.Delete("downloads", ("url", SqliteType.Text))) {
-				foreach (var duplicateUrl in duplicateUrlsToDelete) {
-					deleteCmd.Set(":url", duplicateUrl);
-					await deleteCmd.ExecuteNonQueryAsync();
-				}
+		await using (var deleteCmd = conn.Delete("downloads", ("url", SqliteType.Text))) {
+			foreach (var duplicateUrl in duplicateUrlsToDelete) {
+				deleteCmd.Set(":url", duplicateUrl);
+				await deleteCmd.ExecuteNonQueryAsync();
 			}
-
-			await tx.CommitAsync();
 		}
 
+		await conn.CommitTransactionAsync();
+
 		int totalUrls = normalizedUrlsToOriginalUrls.Count;
 		int processedUrls = -1;
 
-		tx = await conn.BeginTransactionAsync();
+		await conn.BeginTransactionAsync();
 
 		await using (var updateCmd = conn.Command("UPDATE downloads SET download_url = :download_url, url = :normalized_url WHERE url = :download_url")) {
 			updateCmd.Add(":normalized_url", SqliteType.Text);
@@ -115,11 +111,10 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 
 					// Not proper way of dealing with transactions, but it avoids a long commit at the end.
 					// Schema upgrades are already non-atomic anyways, so this doesn't make it worse.
-					await tx.CommitAsync();
-					await tx.DisposeAsync();
+					await conn.CommitTransactionAsync();
 
-					tx = await conn.BeginTransactionAsync();
-					updateCmd.Transaction = (SqliteTransaction) tx;
+					await conn.BeginTransactionAsync();
+					conn.AssignActiveTransaction(updateCmd);
 				}
 
 				updateCmd.Set(":normalized_url", normalizedUrl);
@@ -130,8 +125,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 
 		await reporter.SubWork("Updating URLs...", totalUrls, totalUrls);
 
-		await tx.CommitAsync();
-		await tx.DisposeAsync();
+		await conn.CommitTransactionAsync();
 
 		await conn.ExecuteAsync("PRAGMA cache_size = -2000");
 	}

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo7.cs

@@ -11,56 +11,55 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
 		await reporter.MainWork("Applying schema changes...", 0, 6);
 		await SqliteSchema.CreateDownloadTables(conn);
-		
+
 		await reporter.MainWork("Migrating download metadata...", 1, 6);
 		await conn.ExecuteAsync("INSERT INTO download_metadata (normalized_url, download_url, status, size) SELECT normalized_url, download_url, status, size FROM downloads");
-		
+
 		await reporter.MainWork("Merging attachment metadata...", 2, 6);
 		await conn.ExecuteAsync("UPDATE download_metadata SET type = (SELECT type FROM attachments WHERE download_metadata.normalized_url = attachments.normalized_url)");
-		
+
 		await reporter.MainWork("Migrating downloaded files...", 3, 6);
 		await MigrateDownloadBlobsToNewTable(conn, reporter);
-		
+
 		await reporter.MainWork("Applying schema changes...", 4, 6);
 		await conn.ExecuteAsync("DROP TABLE downloads");
-		
+
 		await reporter.MainWork("Discovering downloadable links...", 5, 6);
 		await DiscoverDownloadableLinks(conn, reporter);
 	}
 
 	private async Task MigrateDownloadBlobsToNewTable(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
 		await reporter.SubWork("Listing downloaded files...", 0, 0);
-		
+
 		var urlsToMigrate = await GetDownloadedFileUrls(conn);
 		int totalFiles = urlsToMigrate.Count;
 		int processedFiles = -1;
 
 		await reporter.SubWork("Processing downloaded files...", 0, totalFiles);
-		
-		var tx = await conn.BeginTransactionAsync();
+
+		await conn.BeginTransactionAsync();
 
 		await using (var insertCmd = conn.Command("INSERT INTO download_blobs (normalized_url, blob) SELECT normalized_url, blob FROM downloads WHERE normalized_url = :normalized_url"))
 		await using (var deleteCmd = conn.Command("DELETE FROM downloads WHERE normalized_url = :normalized_url")) {
 			insertCmd.Add(":normalized_url", SqliteType.Text);
 			deleteCmd.Add(":normalized_url", SqliteType.Text);
-			
+
 			foreach (var url in urlsToMigrate) {
 				if (++processedFiles % 10 == 0) {
 					await reporter.SubWork("Processing downloaded files...", processedFiles, totalFiles);
-			
+
 					// Not proper way of dealing with transactions, but it avoids a long commit at the end.
 					// Schema upgrades are already non-atomic anyways, so this doesn't make it worse.
-					await tx.CommitAsync();
-					await tx.DisposeAsync();
-			
-					tx = await conn.BeginTransactionAsync();
-					insertCmd.Transaction = (SqliteTransaction) tx;
-					deleteCmd.Transaction = (SqliteTransaction) tx;
+					await conn.CommitTransactionAsync();
+					
+					await conn.BeginTransactionAsync();
+					conn.AssignActiveTransaction(insertCmd);
+					conn.AssignActiveTransaction(deleteCmd);
 				}
-				
+
 				insertCmd.Set(":normalized_url", url);
 				await insertCmd.ExecuteNonQueryAsync();
-				
+
 				deleteCmd.Set(":normalized_url", url);
 				await deleteCmd.ExecuteNonQueryAsync();
 			}
@@ -68,8 +67,7 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 
 		await reporter.SubWork("Processing downloaded files...", totalFiles, totalFiles);
 
-		await tx.CommitAsync();
-		await tx.DisposeAsync();
+		await conn.CommitTransactionAsync();
 	}
 
 	private async Task<List<string>> GetDownloadedFileUrls(ISqliteConnection conn) {
@@ -110,46 +108,46 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 			insertCmd.Set(":size", download.Size);
 			await insertCmd.ExecuteNonQueryAsync();
 		}
-		
-		await using (var tx = await conn.BeginTransactionAsync()) {
-			await using var insertCmd = conn.Command("INSERT OR IGNORE INTO download_metadata (normalized_url, download_url, status, type, size) VALUES (:normalized_url, :download_url, :status, :type, :size)");
-			insertCmd.Add(":normalized_url", SqliteType.Text);
-			insertCmd.Add(":download_url", SqliteType.Text);
-			insertCmd.Add(":status", SqliteType.Integer);
-			insertCmd.Add(":type", SqliteType.Text);
-			insertCmd.Add(":size", SqliteType.Integer);
 
-			await reporter.SubWork("Processing embeds...", 1, 4);
-			
-			await using (var embedCmd = conn.Command("SELECT json FROM embeds")) {
-				await using var reader = await embedCmd.ExecuteReaderAsync();
+		await conn.BeginTransactionAsync();
 
-				while (await reader.ReadAsync()) {
-					await InsertDownload(insertCmd, await DownloadLinkExtractor.TryFromEmbedJson(reader.GetStream(0)));
-				}
+		await using var insertCmd = conn.Command("INSERT OR IGNORE INTO download_metadata (normalized_url, download_url, status, type, size) VALUES (:normalized_url, :download_url, :status, :type, :size)");
+		insertCmd.Add(":normalized_url", SqliteType.Text);
+		insertCmd.Add(":download_url", SqliteType.Text);
+		insertCmd.Add(":status", SqliteType.Integer);
+		insertCmd.Add(":type", SqliteType.Text);
+		insertCmd.Add(":size", SqliteType.Integer);
+
+		await reporter.SubWork("Processing embeds...", 1, 4);
+
+		await using (var embedCmd = conn.Command("SELECT json FROM embeds")) {
+			await using var reader = await embedCmd.ExecuteReaderAsync();
+
+			while (await reader.ReadAsync()) {
+				await InsertDownload(insertCmd, await DownloadLinkExtractor.TryFromEmbedJson(reader.GetStream(0)));
 			}
-
-			await reporter.SubWork("Processing users...", 2, 4);
-			
-			await using (var avatarCmd = conn.Command("SELECT id, avatar_url FROM users WHERE avatar_url IS NOT NULL")) {
-				await using var reader = await avatarCmd.ExecuteReaderAsync();
-
-				while (await reader.ReadAsync()) {
-					await InsertDownload(insertCmd, DownloadLinkExtractor.FromUserAvatar(reader.GetUint64(0), reader.GetString(1)));
-				}
-			}
-			
-			await reporter.SubWork("Processing reactions...", 3, 4);
-			
-			await using (var avatarCmd = conn.Command("SELECT DISTINCT emoji_id, emoji_flags FROM reactions WHERE emoji_id IS NOT NULL")) {
-				await using var reader = await avatarCmd.ExecuteReaderAsync();
-
-				while (await reader.ReadAsync()) {
-					await InsertDownload(insertCmd, DownloadLinkExtractor.FromEmoji(reader.GetUint64(0), (EmojiFlags) reader.GetInt16(1)));
-				}
-			}
-			
-			await tx.CommitAsync();
 		}
+
+		await reporter.SubWork("Processing users...", 2, 4);
+
+		await using (var avatarCmd = conn.Command("SELECT id, avatar_url FROM users WHERE avatar_url IS NOT NULL")) {
+			await using var reader = await avatarCmd.ExecuteReaderAsync();
+
+			while (await reader.ReadAsync()) {
+				await InsertDownload(insertCmd, DownloadLinkExtractor.FromUserAvatar(reader.GetUint64(0), reader.GetString(1)));
+			}
+		}
+
+		await reporter.SubWork("Processing reactions...", 3, 4);
+
+		await using (var avatarCmd = conn.Command("SELECT DISTINCT emoji_id, emoji_flags FROM reactions WHERE emoji_id IS NOT NULL")) {
+			await using var reader = await avatarCmd.ExecuteReaderAsync();
+
+			while (await reader.ReadAsync()) {
+				await InsertDownload(insertCmd, DownloadLinkExtractor.FromEmoji(reader.GetUint64(0), (EmojiFlags) reader.GetInt16(1)));
+			}
+		}
+
+		await conn.CommitTransactionAsync();
 	}
 }

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo8.cs

@@ -0,0 +1,11 @@
+using System.Threading.Tasks;
+using DHT.Server.Database.Sqlite.Utils;
+
+namespace DHT.Server.Database.Sqlite.Schema;
+
+sealed class SqliteSchemaUpgradeTo8 : ISchemaUpgrade {
+	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
+		await reporter.MainWork("Applying schema changes...", 0, 1);
+		await conn.ExecuteAsync("ALTER TABLE users ADD display_name TEXT");
+	}
+}

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo9.cs

@@ -0,0 +1,23 @@
+using System.Threading.Tasks;
+using DHT.Server.Database.Sqlite.Utils;
+
+namespace DHT.Server.Database.Sqlite.Schema;
+
+sealed class SqliteSchemaUpgradeTo9 : ISchemaUpgrade {
+	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
+		await reporter.MainWork("Applying schema changes...", 0, 3);
+		await SqliteSchema.CreateMessageAttachmentsTable(conn);
+		
+		await reporter.MainWork("Migrating message attachments...", 1, 3);
+		await conn.ExecuteAsync("INSERT INTO message_attachments (message_id, attachment_id) SELECT message_id, attachment_id FROM attachments a JOIN messages m USING (message_id)");
+		
+		await reporter.MainWork("Applying schema changes...", 2, 3);
+		await conn.ExecuteAsync("DROP INDEX attachments_message_ix");
+		await conn.ExecuteAsync("ALTER TABLE attachments DROP COLUMN message_id");
+		
+		await conn.ExecuteAsync("ALTER TABLE embeds RENAME TO message_embeds");
+		await conn.ExecuteAsync("ALTER TABLE edit_timestamps RENAME TO message_edit_timestamps");
+		await conn.ExecuteAsync("ALTER TABLE replied_to RENAME TO message_replied_to");
+		await conn.ExecuteAsync("ALTER TABLE reactions RENAME TO message_reactions");
+	}
+}

app/Server/Database/Sqlite/SqliteDatabaseFile.cs

@@ -39,6 +39,7 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 
 	public string Path { get; }
 	
+	public ISettingsRepository Settings => settings;
 	public IUserRepository Users => users;
 	public IServerRepository Servers => servers;
 	public IChannelRepository Channels => channels;
@@ -47,6 +48,7 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 	
 	private readonly SqliteConnectionPool pool;
 	
+	private readonly SqliteSettingsRepository settings;
 	private readonly SqliteUserRepository users;
 	private readonly SqliteServerRepository servers;
 	private readonly SqliteChannelRepository channels;
@@ -58,6 +60,7 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 		this.pool = pool;
 
 		downloads = new SqliteDownloadRepository(pool);
+		settings = new SqliteSettingsRepository(pool);
 		users = new SqliteUserRepository(pool, downloads);
 		servers = new SqliteServerRepository(pool);
 		channels = new SqliteChannelRepository(pool);

app/Server/Database/Sqlite/SqliteSchema.cs

@@ -8,7 +8,7 @@ using DHT.Utils.Logging;
 namespace DHT.Server.Database.Sqlite;
 
 sealed class SqliteSchema {
-	internal const int Version = 7;
+	internal const int Version = 9;
 
 	private static readonly Log Log = Log.ForType<SqliteSchema>();
 
@@ -48,6 +48,7 @@ sealed class SqliteSchema {
 		                        CREATE TABLE users (
 		                        	id            INTEGER PRIMARY KEY NOT NULL,
 		                        	name          TEXT NOT NULL,
+		                        	display_name  TEXT,
 		                        	avatar_url    TEXT,
 		                        	discriminator TEXT
 		                        )
@@ -85,7 +86,6 @@ sealed class SqliteSchema {
 
 		await conn.ExecuteAsync("""
 		                        CREATE TABLE attachments (
-		                        	message_id     INTEGER NOT NULL,
 		                        	attachment_id  INTEGER NOT NULL PRIMARY KEY NOT NULL,
 		                        	name           TEXT NOT NULL,
 		                        	type           TEXT,
@@ -98,14 +98,14 @@ sealed class SqliteSchema {
 		                        """);
 
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE embeds (
+		                        CREATE TABLE message_embeds (
 		                        	message_id INTEGER NOT NULL,
 		                        	json       TEXT NOT NULL
 		                        )
 		                        """);
 
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE reactions (
+		                        CREATE TABLE message_reactions (
 		                        	message_id  INTEGER NOT NULL,
 		                        	emoji_id    INTEGER,
 		                        	emoji_name  TEXT,
@@ -117,17 +117,17 @@ sealed class SqliteSchema {
 		await CreateMessageEditTimestampTable(conn);
 		await CreateMessageRepliedToTable(conn);
 		await CreateDownloadTables(conn);
+		await CreateMessageAttachmentsTable(conn);
 
-		await conn.ExecuteAsync("CREATE INDEX attachments_message_ix ON attachments(message_id)");
-		await conn.ExecuteAsync("CREATE INDEX embeds_message_ix ON embeds(message_id)");
-		await conn.ExecuteAsync("CREATE INDEX reactions_message_ix ON reactions(message_id)");
+		await conn.ExecuteAsync("CREATE INDEX embeds_message_ix ON message_embeds(message_id)");
+		await conn.ExecuteAsync("CREATE INDEX reactions_message_ix ON message_reactions(message_id)");
 
 		await conn.ExecuteAsync("INSERT INTO metadata (key, value) VALUES ('version', " + Version + ")");
 	}
 
 	internal static async Task CreateMessageEditTimestampTable(ISqliteConnection conn) {
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE edit_timestamps (
+		                        CREATE TABLE message_edit_timestamps (
 		                        	message_id     INTEGER PRIMARY KEY NOT NULL,
 		                        	edit_timestamp INTEGER NOT NULL
 		                        )
@@ -136,7 +136,7 @@ sealed class SqliteSchema {
 
 	internal static async Task CreateMessageRepliedToTable(ISqliteConnection conn) {
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE replied_to (
+		                        CREATE TABLE message_replied_to (
 		                        	message_id    INTEGER PRIMARY KEY NOT NULL,
 		                        	replied_to_id INTEGER NOT NULL
 		                        )
@@ -162,6 +162,18 @@ sealed class SqliteSchema {
 		                        )
 		                        """);
 	}
+	
+	internal static async Task CreateMessageAttachmentsTable(ISqliteConnection conn) {
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_attachments (
+		                        	message_id    INTEGER NOT NULL,
+		                        	attachment_id INTEGER NOT NULL,
+		                        	PRIMARY KEY (message_id, attachment_id),
+		                            FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE,
+		                            FOREIGN KEY (attachment_id) REFERENCES attachments (attachment_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+	}
 
 	private async Task UpgradeSchemas(int dbVersion, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
 		var upgrades = new Dictionary<int, ISchemaUpgrade> {
@@ -171,13 +183,15 @@ sealed class SqliteSchema {
 			{ 4, new SqliteSchemaUpgradeTo5() },
 			{ 5, new SqliteSchemaUpgradeTo6() },
 			{ 6, new SqliteSchemaUpgradeTo7() },
+			{ 7, new SqliteSchemaUpgradeTo8() },
+			{ 8, new SqliteSchemaUpgradeTo9() },
 		};
 
 		var perf = Log.Start("from version " + dbVersion);
 
 		for (int fromVersion = dbVersion; fromVersion < Version; fromVersion++) {
 			var toVersion = fromVersion + 1;
-			
+
 			if (upgrades.TryGetValue(fromVersion, out var upgrade)) {
 				await upgrade.Run(conn, reporter);
 			}

app/Server/Database/Sqlite/Utils/ISqliteConnection.cs

@@ -1,8 +1,15 @@
 using System;
+using System.Threading.Tasks;
 using Microsoft.Data.Sqlite;
 
 namespace DHT.Server.Database.Sqlite.Utils;
 
 interface ISqliteConnection : IAsyncDisposable {
 	SqliteConnection InnerConnection { get; }
+	
+	Task BeginTransactionAsync();
+	Task CommitTransactionAsync();
+	Task RollbackTransactionAsync();
+	
+	void AssignActiveTransaction(SqliteCommand command);
 }

app/Server/Database/Sqlite/Utils/SqliteConnectionPool.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Data.Common;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Utils.Collections;
@@ -73,17 +74,48 @@ sealed class SqliteConnectionPool : IAsyncDisposable {
 		disposalTokenSource.Dispose();
 	}
 
-	private sealed class PooledConnection : ISqliteConnection {
-		public SqliteConnection InnerConnection { get; }
+	private sealed class PooledConnection(SqliteConnectionPool pool, SqliteConnection conn) : ISqliteConnection {
+		public SqliteConnection InnerConnection { get; } = conn;
 
-		private readonly SqliteConnectionPool pool;
+		private DbTransaction? activeTransaction;
 
-		public PooledConnection(SqliteConnectionPool pool, SqliteConnection conn) {
-			this.pool = pool;
-			this.InnerConnection = conn;
+		public async Task BeginTransactionAsync() {
+			if (activeTransaction != null) {
+				throw new InvalidOperationException("A transaction is already active.");
+			}
+			
+			activeTransaction = await InnerConnection.BeginTransactionAsync();
+		}
+
+		public async Task CommitTransactionAsync() {
+			if (activeTransaction == null) {
+				throw new InvalidOperationException("No active transaction to commit.");
+			}
+
+			await activeTransaction.CommitAsync();
+			await activeTransaction.DisposeAsync();
+			activeTransaction = null;
+		}
+
+		public async Task RollbackTransactionAsync() {
+			if (activeTransaction == null) {
+				throw new InvalidOperationException("No active transaction to rollback.");
+			}
+			
+			await activeTransaction.RollbackAsync();
+			await activeTransaction.DisposeAsync();
+			activeTransaction = null;
+		}
+
+		public void AssignActiveTransaction(SqliteCommand command) {
+			command.Transaction = (SqliteTransaction?) activeTransaction;
 		}
 
 		public async ValueTask DisposeAsync() {
+			if (activeTransaction != null) {
+				await RollbackTransactionAsync();
+			}
+			
 			await pool.Return(this);
 		}
 	}

app/Server/Database/Sqlite/Utils/SqliteExtensions.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Data.Common;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -9,10 +8,6 @@ using Microsoft.Data.Sqlite;
 namespace DHT.Server.Database.Sqlite.Utils;
 
 static class SqliteExtensions {
-	public static ValueTask<DbTransaction> BeginTransactionAsync(this ISqliteConnection conn) {
-		return conn.InnerConnection.BeginTransactionAsync();
-	}
-
 	public static SqliteCommand Command(this ISqliteConnection conn, [LanguageInjection("sql")] string sql) {
 		var cmd = conn.InnerConnection.CreateCommand();
 		cmd.CommandText = sql;
@@ -30,6 +25,10 @@ static class SqliteExtensions {
 
 		return await reader.ReadAsync(cancellationToken) ? readFunction(reader) : readFunction(null);
 	}
+	
+	public static async Task<long> ExecuteLongScalarAsync(this SqliteCommand command) {
+		return (long) (await command.ExecuteScalarAsync())!;
+	}
 
 	public static SqliteCommand Insert(this ISqliteConnection conn, string tableName, (string Name, SqliteType Type)[] columns) {
 		string columnNames = string.Join(',', columns.Select(static c => c.Name));

app/Server/Download/DownloadItem.cs

@@ -10,13 +10,12 @@ public readonly struct DownloadItem {
 	public string? Type { get; init; }
 	public ulong? Size { get; init; }
 	
-	internal DownloadWithData ToSuccess(byte[] data) {
-		var size = (ulong) Math.Max(data.LongLength, 0);
-		return new DownloadWithData(new Data.Download(NormalizedUrl, DownloadUrl, DownloadStatus.Success, Type, size), data);
+	internal Data.Download ToSuccess(long size) {
+		return new Data.Download(NormalizedUrl, DownloadUrl, DownloadStatus.Success, Type, (ulong) Math.Max(size, 0));
 	}
 	
-	internal DownloadWithData ToFailure(HttpStatusCode? statusCode = null) {
+	internal Data.Download ToFailure(HttpStatusCode? statusCode = null) {
 		var status = statusCode.HasValue ? (DownloadStatus) (int) statusCode : DownloadStatus.GenericError;
-		return new DownloadWithData(new Data.Download(NormalizedUrl, DownloadUrl, status, Type, Size), Data: null);
+		return new Data.Download(NormalizedUrl, DownloadUrl, status, Type, Size);
 	}
 }

app/Server/Download/Downloader.cs

@@ -11,16 +11,18 @@ public sealed class Downloader {
 	public bool IsDownloading => current != null;
 	
 	private readonly IDatabaseFile db;
+	private readonly int? concurrentDownloads;
 	private readonly SemaphoreSlim semaphore = new (1, 1);
 	
-	internal Downloader(IDatabaseFile db) {
+	internal Downloader(IDatabaseFile db, int? concurrentDownloads) {
 		this.db = db;
+		this.concurrentDownloads = concurrentDownloads;
 	}
 
 	public async Task<IObservable<DownloadItem>> Start(DownloadItemFilter filter) {
 		await semaphore.WaitAsync();
 		try {
-			current ??= new DownloaderTask(db, filter);
+			current ??= new DownloaderTask(db, filter, concurrentDownloads);
 			return current.FinishedItems;
 		} finally {
 			semaphore.Release();

app/Server/Download/DownloaderTask.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Reactive.Subjects;
@@ -15,10 +16,14 @@ namespace DHT.Server.Download;
 sealed class DownloaderTask : IAsyncDisposable {
 	private static readonly Log Log = Log.ForType<DownloaderTask>();
 
-	private const int DownloadTasks = 4;
+	private const int DefaultConcurrentDownloads = 4;
 	private const int QueueSize = 25;
 	private const string UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36";
 
+	private static int GetDownloadTaskCount(int? concurrentDownloads) {
+		return Math.Max(1, concurrentDownloads ?? DefaultConcurrentDownloads);
+	}
+
 	private readonly Channel<DownloadItem> downloadQueue = Channel.CreateBounded<DownloadItem>(new BoundedChannelOptions(QueueSize) {
 		SingleReader = false,
 		SingleWriter = true,
@@ -38,12 +43,12 @@ sealed class DownloaderTask : IAsyncDisposable {
 
 	public IObservable<DownloadItem> FinishedItems => finishedItemPublisher;
 
-	internal DownloaderTask(IDatabaseFile db, DownloadItemFilter filter) {
+	internal DownloaderTask(IDatabaseFile db, DownloadItemFilter filter, int? concurrentDownloads) {
 		this.db = db;
 		this.filter = filter;
 		this.cancellationToken = cancellationTokenSource.Token;
 		this.queueWriterTask = Task.Run(RunQueueWriterTask);
-		this.downloadTasks = Enumerable.Range(1, DownloadTasks).Select(taskIndex => Task.Run(() => RunDownloadTask(taskIndex))).ToArray();
+		this.downloadTasks = Enumerable.Range(1, GetDownloadTaskCount(concurrentDownloads)).Select(taskIndex => Task.Run(() => RunDownloadTask(taskIndex))).ToArray();
 	}
 
 	private async Task RunQueueWriterTask() {
@@ -63,24 +68,36 @@ sealed class DownloaderTask : IAsyncDisposable {
 	private async Task RunDownloadTask(int taskIndex) {
 		var log = Log.ForType<DownloaderTask>("Task " + taskIndex);
 
-		var client = new HttpClient();
+		var client = new HttpClient(new SocketsHttpHandler {
+			ConnectTimeout = TimeSpan.FromSeconds(30)
+		});
+
+		client.Timeout = Timeout.InfiniteTimeSpan;
 		client.DefaultRequestHeaders.UserAgent.ParseAdd(UserAgent);
-		client.Timeout = TimeSpan.FromSeconds(30);
+
+		string tempFileName = Path.GetTempFileName();
+		log.Debug("Using temporary file: " + tempFileName);
+
+		await using var tempFileStream = new FileStream(tempFileName, FileMode.Create, FileAccess.ReadWrite, FileShare.Read, 4096, FileOptions.DeleteOnClose);
 
 		while (!cancellationToken.IsCancellationRequested) {
 			var item = await downloadQueue.Reader.ReadAsync(cancellationToken);
 			log.Debug("Downloading " + item.DownloadUrl + "...");
 
 			try {
-				var downloadedBytes = await client.GetByteArrayAsync(item.DownloadUrl, cancellationToken);
-				await db.Downloads.AddDownload(item.ToSuccess(downloadedBytes));
-			} catch (OperationCanceledException) {
+				var response = await client.SendAsync(new HttpRequestMessage(HttpMethod.Get, item.DownloadUrl), HttpCompletionOption.ResponseHeadersRead, cancellationToken);
+				response.EnsureSuccessStatusCode();
+				await HandleResponse(response, tempFileStream, item);
+			} catch (OperationCanceledException e) when (e.CancellationToken == cancellationToken) {
 				// Ignore.
+			} catch (TaskCanceledException e) when (e.InnerException is TimeoutException) {
+				await db.Downloads.AddDownload(item.ToFailure(), stream: null);
+				log.Error("Download timed out: " + item.DownloadUrl);
 			} catch (HttpRequestException e) {
-				await db.Downloads.AddDownload(item.ToFailure(e.StatusCode));
+				await db.Downloads.AddDownload(item.ToFailure(e.StatusCode), stream: null);
 				log.Error(e);
 			} catch (Exception e) {
-				await db.Downloads.AddDownload(item.ToFailure());
+				await db.Downloads.AddDownload(item.ToFailure(), stream: null);
 				log.Error(e);
 			} finally {
 				try {
@@ -92,6 +109,27 @@ sealed class DownloaderTask : IAsyncDisposable {
 		}
 	}
 
+	private async Task HandleResponse(HttpResponseMessage response, FileStream tempFileStream, DownloadItem item) {
+		if (response.Content.Headers.ContentLength is not {} contentLength) {
+			throw new InvalidOperationException("Download response has no content length: " + item.DownloadUrl);
+		}
+
+		try {
+			if (tempFileStream.Length != 0) {
+				throw new InvalidOperationException("Temporary file is not empty: " + tempFileStream.Name);
+			}
+
+			await using (var responseStream = await response.Content.ReadAsStreamAsync(cancellationToken)) {
+				await responseStream.CopyToAsync(tempFileStream, cancellationToken);
+			}
+
+			tempFileStream.Seek(0, SeekOrigin.Begin);
+			await db.Downloads.AddDownload(item.ToSuccess(contentLength), tempFileStream);
+		} finally {
+			tempFileStream.SetLength(0);
+		}
+	}
+
 	public async ValueTask DisposeAsync() {
 		try {
 			await cancellationTokenSource.CancelAsync();

app/Server/Endpoints/BaseEndpoint.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Net;
 using System.Text.Json;
+using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Database;
 using DHT.Utils.Http;
@@ -9,39 +10,50 @@ using Microsoft.AspNetCore.Http;
 
 namespace DHT.Server.Endpoints;
 
-abstract class BaseEndpoint {
+abstract class BaseEndpoint(IDatabaseFile db) {
 	private static readonly Log Log = Log.ForType<BaseEndpoint>();
 
-	protected IDatabaseFile Db { get; }
-
-	protected BaseEndpoint(IDatabaseFile db) {
-		this.Db = db;
-	}
+	protected IDatabaseFile Db { get; } = db;
 
 	public async Task Handle(HttpContext ctx) {
 		var response = ctx.Response;
 
 		try {
 			response.StatusCode = (int) HttpStatusCode.OK;
-			var output = await Respond(ctx);
-			await output.WriteTo(response);
+			await Respond(ctx.Request, response, ctx.RequestAborted);
+		} catch (OperationCanceledException) {
+			throw;
 		} catch (HttpException e) {
 			Log.Error(e);
 			response.StatusCode = (int) e.StatusCode;
-			await response.WriteAsync(e.Message);
+			if (response.HasStarted) {
+				Log.Warn("Response has already started, cannot write status message: " + e.Message);
+			}
+			else {
+				await response.WriteAsync(e.Message);
+			}
 		} catch (Exception e) {
 			Log.Error(e);
 			response.StatusCode = (int) HttpStatusCode.InternalServerError;
 		}
 	}
 
-	protected abstract Task<IHttpOutput> Respond(HttpContext ctx);
+	protected abstract Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken);
 
-	protected static async Task<JsonElement> ReadJson(HttpContext ctx) {
+	protected static async Task<JsonElement> ReadJson(HttpRequest request) {
 		try {
-			return await ctx.Request.ReadFromJsonAsync(JsonElementContext.Default.JsonElement);
+			return await request.ReadFromJsonAsync(JsonElementContext.Default.JsonElement);
 		} catch (JsonException) {
 			throw new HttpException(HttpStatusCode.UnsupportedMediaType, "This endpoint only accepts JSON.");
 		}
 	}
+	
+	protected static Guid GetSessionId(HttpRequest request) {
+		if (request.Query.TryGetValue("session", out var sessionIdValue) && sessionIdValue.Count == 1 && Guid.TryParse(sessionIdValue[0], out Guid sessionId)) {
+			return sessionId;
+		}
+		else {
+			throw new HttpException(HttpStatusCode.BadRequest, "Invalid session ID.");
+		}
+	}
 }

app/Server/Endpoints/GetDownloadedFileEndpoint.cs

@@ -1,4 +1,7 @@
+using System;
+using System.IO;
 using System.Net;
+using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Database;
 using DHT.Server.Download;
@@ -7,18 +10,17 @@ using Microsoft.AspNetCore.Http;
 
 namespace DHT.Server.Endpoints;
 
-sealed class GetDownloadedFileEndpoint : BaseEndpoint {
-	public GetDownloadedFileEndpoint(IDatabaseFile db) : base(db) {}
-
-	protected override async Task<IHttpOutput> Respond(HttpContext ctx) {
-		string url = WebUtility.UrlDecode((string) ctx.Request.RouteValues["url"]!);
+sealed class GetDownloadedFileEndpoint(IDatabaseFile db) : BaseEndpoint(db) {
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		string url = WebUtility.UrlDecode((string) request.RouteValues["url"]!);
 		string normalizedUrl = DiscordCdn.NormalizeUrl(url);
 		
-		if (await Db.Downloads.GetSuccessfulDownloadWithData(normalizedUrl) is { Download: {} download, Data: {} data }) {
-			return new HttpOutput.File(download.Type, data);
-		}
-		else {
-			return new HttpOutput.Redirect(url, permanent: false);
+		if (!await Db.Downloads.GetSuccessfulDownloadWithData(normalizedUrl, WriteDataTo(response), cancellationToken)) {
+			response.Redirect(url, permanent: false);
 		}
 	}
+	
+	private static Func<Data.Download, Stream, CancellationToken, Task> WriteDataTo(HttpResponse response) {
+		return (download, stream, cancellationToken) => response.WriteStreamAsync(download.Type, download.Size, stream, cancellationToken);
+	}
 }

app/Server/Endpoints/GetTrackingScriptEndpoint.cs

@@ -1,5 +1,5 @@
-using System.Reflection;
-using System.Text;
+using System.Net.Mime;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Web;
 using DHT.Server.Database;
@@ -10,25 +10,17 @@ using Microsoft.AspNetCore.Http;
 
 namespace DHT.Server.Endpoints;
 
-sealed class GetTrackingScriptEndpoint : BaseEndpoint {
-	private static ResourceLoader Resources { get; } = new (Assembly.GetExecutingAssembly());
-	
-	private readonly ServerParameters serverParameters;
-	
-	public GetTrackingScriptEndpoint(IDatabaseFile db, ServerParameters parameters) : base(db) {
-		serverParameters = parameters;
-	}
-
-	protected override async Task<IHttpOutput> Respond(HttpContext ctx) {
-		string bootstrap = await Resources.ReadTextAsync("Tracker/bootstrap.js");
-		string script = bootstrap.Replace("= 0; /*[PORT]*/", "= " + serverParameters.Port + ";")
-		                         .Replace("/*[TOKEN]*/", HttpUtility.JavaScriptStringEncode(serverParameters.Token))
-		                         .Replace("/*[IMPORTS]*/", await Resources.ReadJoinedAsync("Tracker/scripts/", '\n'))
-		                         .Replace("/*[CSS-CONTROLLER]*/", await Resources.ReadTextAsync("Tracker/styles/controller.css"))
-		                         .Replace("/*[CSS-SETTINGS]*/", await Resources.ReadTextAsync("Tracker/styles/settings.css"))
-		                         .Replace("/*[DEBUGGER]*/", ctx.Request.Query.ContainsKey("debug") ? "debugger;" : "");
+sealed class GetTrackingScriptEndpoint(IDatabaseFile db, ServerParameters parameters, ResourceLoader resources) : BaseEndpoint(db) {
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		string bootstrap = await resources.ReadTextAsync("Tracker/bootstrap.js");
+		string script = bootstrap.Replace("= 0; /*[PORT]*/", "= " + parameters.Port + ";")
+		                         .Replace("/*[TOKEN]*/", HttpUtility.JavaScriptStringEncode(parameters.Token))
+		                         .Replace("/*[IMPORTS]*/", await resources.ReadJoinedAsync("Tracker/scripts/", '\n', [ "/webpack.js" ]))
+		                         .Replace("/*[CSS-CONTROLLER]*/", await resources.ReadTextAsync("Tracker/styles/controller.css"))
+		                         .Replace("/*[CSS-SETTINGS]*/", await resources.ReadTextAsync("Tracker/styles/settings.css"))
+		                         .Replace("/*[DEBUGGER]*/", request.Query.ContainsKey("debug") ? "debugger;" : "");
 		
-		ctx.Response.Headers.Append("X-DHT", "1");
-		return new HttpOutput.File("text/javascript", Encoding.UTF8.GetBytes(script));
+		response.Headers.Append("X-DHT", "1");
+		await response.WriteTextAsync(MediaTypeNames.Text.JavaScript, script, cancellationToken);
 	}
 }

app/Server/Endpoints/GetViewerMessagesEndpoint.cs

@@ -0,0 +1,18 @@
+using System.Threading;
+using System.Threading.Tasks;
+using DHT.Server.Database;
+using DHT.Server.Database.Export;
+using DHT.Server.Service.Viewer;
+using Microsoft.AspNetCore.Http;
+
+namespace DHT.Server.Endpoints; 
+
+sealed class GetViewerMessagesEndpoint(IDatabaseFile db, ViewerSessions viewerSessions) : BaseEndpoint(db) {
+	protected override Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		var sessionId = GetSessionId(request);
+		var session = viewerSessions.Get(sessionId);
+		
+		response.ContentType = "application/x-ndjson";
+		return ViewerJsonExport.GetMessages(response.Body, Db, session.MessageFilter, cancellationToken);
+	}
+}

app/Server/Endpoints/GetViewerMetadataEndpoint.cs

@@ -0,0 +1,19 @@
+using System.Net.Mime;
+using System.Threading;
+using System.Threading.Tasks;
+using DHT.Server.Database;
+using DHT.Server.Database.Export;
+using DHT.Server.Service.Viewer;
+using Microsoft.AspNetCore.Http;
+
+namespace DHT.Server.Endpoints; 
+
+sealed class GetViewerMetadataEndpoint(IDatabaseFile db, ViewerSessions viewerSessions) : BaseEndpoint(db) {
+	protected override Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		var sessionId = GetSessionId(request);
+		var session = viewerSessions.Get(sessionId);
+		
+		response.ContentType = MediaTypeNames.Application.Json;
+		return ViewerJsonExport.GetMetadata(response.Body, Db, session.MessageFilter, cancellationToken);
+	}
+}

app/Server/Endpoints/TrackChannelEndpoint.cs

@@ -1,5 +1,6 @@
 using System.Net;
 using System.Text.Json;
+using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
 using DHT.Server.Database;
@@ -8,18 +9,14 @@ using Microsoft.AspNetCore.Http;
 
 namespace DHT.Server.Endpoints;
 
-sealed class TrackChannelEndpoint : BaseEndpoint {
-	public TrackChannelEndpoint(IDatabaseFile db) : base(db) {}
-
-	protected override async Task<IHttpOutput> Respond(HttpContext ctx) {
-		var root = await ReadJson(ctx);
+sealed class TrackChannelEndpoint(IDatabaseFile db) : BaseEndpoint(db) {
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		var root = await ReadJson(request);
 		var server = ReadServer(root.RequireObject("server"), "server");
 		var channel = ReadChannel(root.RequireObject("channel"), "channel", server.Id);
 
 		await Db.Servers.Add([server]);
 		await Db.Channels.Add([channel]);
-
-		return HttpOutput.None;
 	}
 
 	private static Data.Server ReadServer(JsonElement json, string path) => new () {

app/Server/Endpoints/TrackMessagesEndpoint.cs

@@ -4,6 +4,7 @@ using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Net;
 using System.Text.Json;
+using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
 using DHT.Server.Data.Filters;
@@ -15,14 +16,12 @@ using Microsoft.AspNetCore.Http;
 
 namespace DHT.Server.Endpoints;
 
-sealed class TrackMessagesEndpoint : BaseEndpoint {
+sealed class TrackMessagesEndpoint(IDatabaseFile db) : BaseEndpoint(db) {
 	private const string HasNewMessages = "1";
 	private const string NoNewMessages = "0";
 
-	public TrackMessagesEndpoint(IDatabaseFile db) : base(db) {}
-
-	protected override async Task<IHttpOutput> Respond(HttpContext ctx) {
-		var root = await ReadJson(ctx);
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		var root = await ReadJson(request);
 
 		if (root.ValueKind != JsonValueKind.Array) {
 			throw new HttpException(HttpStatusCode.BadRequest, "Expected root element to be an array.");
@@ -39,11 +38,11 @@ sealed class TrackMessagesEndpoint : BaseEndpoint {
 		}
 
 		var addedMessageFilter = new MessageFilter { MessageIds = addedMessageIds };
-		bool anyNewMessages = await Db.Messages.Count(addedMessageFilter) < addedMessageIds.Count;
+		bool anyNewMessages = await Db.Messages.Count(addedMessageFilter, CancellationToken.None) < addedMessageIds.Count;
 
 		await Db.Messages.Add(messages);
 
-		return new HttpOutput.Text(anyNewMessages ? HasNewMessages : NoNewMessages);
+		await response.WriteTextAsync(anyNewMessages ? HasNewMessages : NoNewMessages, cancellationToken);
 	}
 
 	private static Message ReadMessage(JsonElement json, string path) => new () {

app/Server/Endpoints/TrackUsersEndpoint.cs

@@ -1,5 +1,6 @@
 using System.Net;
 using System.Text.Json;
+using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Data;
 using DHT.Server.Database;
@@ -8,11 +9,9 @@ using Microsoft.AspNetCore.Http;
 
 namespace DHT.Server.Endpoints;
 
-sealed class TrackUsersEndpoint : BaseEndpoint {
-	public TrackUsersEndpoint(IDatabaseFile db) : base(db) {}
-
-	protected override async Task<IHttpOutput> Respond(HttpContext ctx) {
-		var root = await ReadJson(ctx);
+sealed class TrackUsersEndpoint(IDatabaseFile db) : BaseEndpoint(db) {
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		var root = await ReadJson(request);
 
 		if (root.ValueKind != JsonValueKind.Array) {
 			throw new HttpException(HttpStatusCode.BadRequest, "Expected root element to be an array.");
@@ -26,13 +25,12 @@ sealed class TrackUsersEndpoint : BaseEndpoint {
 		}
 
 		await Db.Users.Add(users);
-
-		return HttpOutput.None;
 	}
 
 	private static User ReadUser(JsonElement json, string path) => new () {
 		Id = json.RequireSnowflake("id", path),
 		Name = json.RequireString("name", path),
+		DisplayName = json.HasKey("displayName") ? json.RequireString("displayName", path) : null,
 		AvatarUrl = json.HasKey("avatar") ? json.RequireString("avatar", path) : null,
 		Discriminator = json.HasKey("discriminator") ? json.RequireString("discriminator", path) : null
 	};

app/Server/Endpoints/ViewerEndpoint.cs

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using System.Net;
+using System.Threading;
+using System.Threading.Tasks;
+using DHT.Server.Database;
+using DHT.Utils.Http;
+using DHT.Utils.Resources;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.StaticFiles;
+
+namespace DHT.Server.Endpoints;
+
+sealed class ViewerEndpoint(IDatabaseFile db, ResourceLoader resources) : BaseEndpoint(db) {
+	private static readonly FileExtensionContentTypeProvider ContentTypeProvider = new ();
+
+	private readonly Dictionary<string, byte[]?> cache = new ();
+	private readonly SemaphoreSlim cacheSemaphore = new (1);
+
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		string path = (string?) request.RouteValues["path"] ?? "index.html";
+		string resourcePath = "Viewer/" + path;
+		
+		byte[]? resourceBytes;
+
+		await cacheSemaphore.WaitAsync(cancellationToken);
+		try {
+			if (!cache.TryGetValue(resourcePath, out resourceBytes)) {
+				cache[resourcePath] = resourceBytes = await resources.ReadBytesAsyncIfExists(resourcePath);
+			}
+		} finally {
+			cacheSemaphore.Release();
+		}
+
+		if (resourceBytes == null) {
+			throw new HttpException(HttpStatusCode.NotFound, "File not found: " + path);
+		}
+		else {
+			var contentType = ContentTypeProvider.TryGetContentType(path, out string? type) ? type : null;
+			await response.WriteFileAsync(contentType, resourceBytes, cancellationToken);
+		}
+	}
+}

app/Server/Server.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
   
   <ItemGroup>
-    <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.7" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
   </ItemGroup>
   
@@ -39,6 +39,16 @@
       <Link>Resources/Tracker/styles/%(RecursiveDir)%(Filename)%(Extension)</Link>
       <Visible>false</Visible>
     </EmbeddedResource>
+    <EmbeddedResource Include="../Resources/Viewer/**">
+      <LogicalName>Viewer\%(RecursiveDir)%(Filename)%(Extension)</LogicalName>
+      <Link>Resources/Viewer/%(RecursiveDir)%(Filename)%(Extension)</Link>
+      <Visible>false</Visible>
+    </EmbeddedResource>
+    <EmbeddedResource Include="../Desktop/Resources/icon.ico">
+      <LogicalName>Viewer\favicon.ico</LogicalName>
+      <Link>Resources/icon.ico</Link>
+      <Visible>false</Visible>
+    </EmbeddedResource>
   </ItemGroup>
   
 </Project>

app/Server/Service/Middlewares/ServerLoggingMiddleware.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Diagnostics;
 using System.Threading.Tasks;
 using DHT.Utils.Logging;
@@ -6,24 +7,34 @@ using Microsoft.AspNetCore.Http.Extensions;
 
 namespace DHT.Server.Service.Middlewares;
 
-sealed class ServerLoggingMiddleware {
+sealed class ServerLoggingMiddleware(RequestDelegate next) {
 	private static readonly Log Log = Log.ForType<ServerLoggingMiddleware>();
-	
-	private readonly RequestDelegate next;
-	
-	public ServerLoggingMiddleware(RequestDelegate next) {
-		this.next = next;
-	}
 
 	public async Task InvokeAsync(HttpContext context) {
 		var stopwatch = Stopwatch.StartNew();
-		await next(context);
+		try {
+			await next(context);
+		} catch (OperationCanceledException) {
+			OnFinished(stopwatch, context);
+			throw;
+		}
+
+		OnFinished(stopwatch, context);
+	}
+
+	private static void OnFinished(Stopwatch stopwatch, HttpContext context) {
 		stopwatch.Stop();
-		
+
 		var request = context.Request;
 		var requestLength = request.ContentLength ?? 0L;
-		var responseStatus = context.Response.StatusCode;
 		var elapsedMs = stopwatch.ElapsedMilliseconds;
-		Log.Debug("Request to " + request.GetEncodedPathAndQuery() + " (" + requestLength + " B) returned " + responseStatus + ", took " + elapsedMs + " ms");
+
+		if (context.RequestAborted.IsCancellationRequested) {
+			Log.Debug("Request to " + request.GetEncodedPathAndQuery() + " (" + requestLength + " B) was cancelled after " + elapsedMs + " ms");
+		}
+		else {
+			var responseStatus = context.Response.StatusCode;
+			Log.Debug("Request to " + request.GetEncodedPathAndQuery() + " (" + requestLength + " B) returned " + responseStatus + ", took " + elapsedMs + " ms");
+		}
 	}
 }

app/Server/Service/ServerManager.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Server.Database;
+using DHT.Server.Service.Viewer;
 using DHT.Utils.Logging;
+using DHT.Utils.Resources;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.Extensions.DependencyInjection;
@@ -25,10 +28,12 @@ public sealed class ServerManager {
 	}
 
 	private readonly IDatabaseFile db;
+	private readonly ViewerSessions viewerSessions;
 	private readonly SemaphoreSlim semaphore = new (1, 1);
 
-	internal ServerManager(IDatabaseFile db) {
+	internal ServerManager(IDatabaseFile db, ViewerSessions viewerSessions) {
 		this.db = db;
+		this.viewerSessions = viewerSessions;
 	}
 
 	public async Task Start(ushort port, string token) {
@@ -57,6 +62,8 @@ public sealed class ServerManager {
 		void AddServices(IServiceCollection services) {
 			services.AddSingleton(typeof(IDatabaseFile), db);
 			services.AddSingleton(typeof(ServerParameters), new ServerParameters(port, token));
+			services.AddSingleton(typeof(ResourceLoader), new ResourceLoader(Assembly.GetExecutingAssembly()));
+			services.AddSingleton(typeof(ViewerSessions), viewerSessions);
 		}
 
 		void SetKestrelOptions(KestrelServerOptions options) {

app/Server/Service/ServerStartup.cs

@@ -3,6 +3,8 @@ using System.Text.Json.Serialization;
 using DHT.Server.Database;
 using DHT.Server.Endpoints;
 using DHT.Server.Service.Middlewares;
+using DHT.Server.Service.Viewer;
+using DHT.Utils.Resources;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http.Json;
 using Microsoft.Extensions.DependencyInjection;
@@ -33,14 +35,24 @@ sealed class Startup {
 	}
 
 	[SuppressMessage("ReSharper", "UnusedMember.Global")]
-	public void Configure(IApplicationBuilder app, IHostApplicationLifetime lifetime, IDatabaseFile db, ServerParameters parameters) {
+	public void Configure(IApplicationBuilder app, IHostApplicationLifetime lifetime, IDatabaseFile db, ServerParameters parameters, ResourceLoader resources, ViewerSessions viewerSessions) {
 		app.UseMiddleware<ServerLoggingMiddleware>();
 		app.UseCors();
-		app.UseMiddleware<ServerAuthorizationMiddleware>();
-		app.UseRouting();
 		
+		app.Map("/viewer", node => {
+			node.UseRouting();
+			node.UseEndpoints(endpoints => {
+				endpoints.MapGet("/{**path}", new ViewerEndpoint(db, resources).Handle);
+			});
+		});
+		
+		app.UseMiddleware<ServerAuthorizationMiddleware>();
+		
+		app.UseRouting();
 		app.UseEndpoints(endpoints => {
-			endpoints.MapGet("/get-tracking-script", new GetTrackingScriptEndpoint(db, parameters).Handle);
+			endpoints.MapGet("/get-tracking-script", new GetTrackingScriptEndpoint(db, parameters, resources).Handle);
+			endpoints.MapGet("/get-viewer-metadata", new GetViewerMetadataEndpoint(db, viewerSessions).Handle);
+			endpoints.MapGet("/get-viewer-messages", new GetViewerMessagesEndpoint(db, viewerSessions).Handle);
 			endpoints.MapGet("/get-downloaded-file/{url}", new GetDownloadedFileEndpoint(db).Handle);
 			endpoints.MapPost("/track-channel", new TrackChannelEndpoint(db).Handle);
 			endpoints.MapPost("/track-users", new TrackUsersEndpoint(db).Handle);

app/Server/Service/Viewer/ViewerSession.cs

@@ -0,0 +1,5 @@
+using DHT.Server.Data.Filters;
+
+namespace DHT.Server.Service.Viewer; 
+
+public readonly record struct ViewerSession(MessageFilter? MessageFilter);

app/Server/Service/Viewer/ViewerSessions.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+
+namespace DHT.Server.Service.Viewer;
+
+public sealed class ViewerSessions : IDisposable {
+	private readonly Dictionary<Guid, ViewerSession> sessions = new ();
+	private bool isDisposed = false;
+
+	public Guid Register(ViewerSession session) {
+		Guid guid = Guid.NewGuid();
+		
+		lock (this) {
+			ObjectDisposedException.ThrowIf(isDisposed, this);
+			sessions[guid] = session;
+		}
+		
+		return guid;
+	}
+
+	internal ViewerSession Get(Guid guid) {
+		lock (this) {
+			return sessions.GetValueOrDefault(guid);
+		}
+	}
+
+	public void Dispose() {
+		lock (this) {
+			if (!isDisposed) {
+				isDisposed = true;
+				sessions.Clear();
+			}
+		}
+	}
+}

app/Server/State.cs

@@ -3,25 +3,29 @@ using System.Threading.Tasks;
 using DHT.Server.Database;
 using DHT.Server.Download;
 using DHT.Server.Service;
+using DHT.Server.Service.Viewer;
 
 namespace DHT.Server;
 
 public sealed class State : IAsyncDisposable {
-	public static State Dummy { get; } = new (DummyDatabaseFile.Instance);
-	
+	public static State Dummy { get; } = new (DummyDatabaseFile.Instance, null);
+
 	public IDatabaseFile Db { get; }
 	public Downloader Downloader { get; }
+	public ViewerSessions ViewerSessions { get; }
 	public ServerManager Server { get; }
 
-	public State(IDatabaseFile db) {
+	public State(IDatabaseFile db, int? concurrentDownloads) {
 		Db = db;
-		Downloader = new Downloader(db);
-		Server = new ServerManager(db);
+		Downloader = new Downloader(db, concurrentDownloads);
+		ViewerSessions = new ViewerSessions();
+		Server = new ServerManager(db, ViewerSessions);
 	}
 
 	public async ValueTask DisposeAsync() {
 		await Downloader.Stop();
 		await Server.Stop();
 		await Db.DisposeAsync();
+		ViewerSessions.Dispose();
 	}
 }

app/Utils/Collections/LinqExtensions.cs

@@ -8,7 +8,7 @@ public static class LinqExtensions {
 		HashSet<TKey>? seenKeys = null;
 
 		foreach (var item in collection) {
-			seenKeys ??= new HashSet<TKey>();
+			seenKeys ??= [];
 
 			if (seenKeys.Add(getKeyFromItem(item))) {
 				yield return item;