Merge 2464610b05 into acac8f7bbb

DiscordChatExporter.Cli/Commands/DeleteMessagesCommand.cs

@@ -0,0 +1,176 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using CliFx.Binding;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Commands.Base;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Exceptions;
+using PowerKit.Extensions;
+
+namespace DiscordChatExporter.Cli.Commands;
+
+[Command("deletemessages", Description = "Deletes messages from a channel.")]
+public partial class DeleteMessagesCommand : DiscordCommandBase
+{
+    [CommandOption(
+        "channel",
+        'c',
+        Description = "Channel ID. Note: You can only delete your own messages."
+    )]
+    public required Snowflake ChannelId { get; set; }
+
+    [CommandOption(
+        "before",
+        Description = "Limit to messages sent before this date (formatted using the current culture)."
+    )]
+    public DateTimeOffset? Before { get; set; }
+
+    [CommandOption(
+        "after",
+        Description = "Limit to messages sent after this date (formatted using the current culture)."
+    )]
+    public DateTimeOffset? After { get; set; }
+
+    public override async ValueTask ExecuteAsync(IConsole console)
+    {
+        await base.ExecuteAsync(console);
+
+        var cancellationToken = console.RegisterCancellationHandler();
+
+        // Get current user
+        await console.Output.WriteLineAsync("Getting current user...");
+        var currentUser = await Discord.GetCurrentUserAsync(cancellationToken);
+        await console.Output.WriteLineAsync($"Authenticated as: {currentUser.FullName}");
+        await console.Output.WriteLineAsync();
+
+        // Resolve the channel
+        await console.Output.WriteLineAsync("Resolving channel...");
+        var channel = await Discord.GetChannelAsync(ChannelId, cancellationToken);
+
+        // Warning message
+        using (console.WithForegroundColor(ConsoleColor.Yellow))
+        {
+            await console.Output.WriteLineAsync(
+                "WARNING: This will delete your messages from the channel."
+            );
+            await console.Output.WriteLineAsync("Messages from other users will be skipped.");
+        }
+
+        await console.Output.WriteLineAsync();
+        await console.Output.WriteLineAsync($"Channel: {channel.Name}");
+
+        if (After is not null)
+            await console.Output.WriteLineAsync($"After: {After:g}");
+
+        if (Before is not null)
+            await console.Output.WriteLineAsync($"Before: {Before:g}");
+
+        await console.Output.WriteLineAsync();
+
+        // Count user's messages
+        await console.Output.WriteLineAsync("Counting your messages...");
+
+        var beforeSnowflake = Before?.Pipe(Snowflake.FromDate);
+        var afterSnowflake = After?.Pipe(Snowflake.FromDate);
+
+        var userMessageIds = new List<Snowflake>();
+        await foreach (
+            var message in Discord.GetMessagesAsync(
+                ChannelId,
+                afterSnowflake,
+                beforeSnowflake,
+                null,
+                cancellationToken
+            )
+        )
+        {
+            if (message.Author.Id == currentUser.Id)
+            {
+                userMessageIds.Add(message.Id);
+            }
+        }
+
+        var totalUserMessages = userMessageIds.Count;
+        await console.Output.WriteLineAsync($"Found {totalUserMessages} of your messages");
+        await console.Output.WriteLineAsync();
+
+        if (totalUserMessages == 0)
+        {
+            using (console.WithForegroundColor(ConsoleColor.Yellow))
+            {
+                await console.Output.WriteLineAsync("No messages to delete.");
+            }
+            return;
+        }
+
+        // Delete messages
+        await console.Output.WriteLineAsync("Deleting messages...");
+
+        var successCount = 0;
+        var failedCount = 0;
+
+        foreach (var messageId in userMessageIds)
+        {
+            try
+            {
+                var deleted = await Discord.DeleteMessageAsync(
+                    ChannelId,
+                    messageId,
+                    cancellationToken
+                );
+
+                if (deleted)
+                {
+                    successCount++;
+                    using (console.WithForegroundColor(ConsoleColor.Green))
+                    {
+                        await console.Output.WriteAsync("\r");
+                        await console.Output.WriteAsync(
+                            $"✓ Deleted {successCount} / {totalUserMessages} messages          "
+                        );
+                    }
+                }
+                else
+                {
+                    failedCount++;
+                }
+
+                // Discord's rate limit headers are handled automatically by DeleteMessageAsync
+            }
+            catch (DiscordChatExporterException ex) when (!ex.IsFatal)
+            {
+                failedCount++;
+                using (console.WithForegroundColor(ConsoleColor.Red))
+                {
+                    await console.Output.WriteAsync("\r");
+                    await console.Output.WriteAsync(
+                        $"✗ Error | Deleted: {successCount} / {totalUserMessages}, Failed: {failedCount}          "
+                    );
+                }
+            }
+        }
+
+        // Clear the progress line
+        await console.Output.WriteLineAsync();
+        await console.Output.WriteLineAsync();
+
+        // Report results
+        await console.Output.WriteLineAsync("Deletion complete!");
+
+        using (console.WithForegroundColor(ConsoleColor.Green))
+        {
+            await console.Output.WriteLineAsync(
+                $"Successfully deleted: {successCount} / {totalUserMessages} message(s)"
+            );
+        }
+
+        if (failedCount > 0)
+        {
+            using (console.WithForegroundColor(ConsoleColor.Red))
+            {
+                await console.Output.WriteLineAsync($"Failed to delete: {failedCount} message(s)");
+            }
+        }
+    }
+}

DiscordChatExporter.Core/Discord/DiscordClient.cs

@@ -220,6 +220,12 @@ public class DiscordClient(
         return response?.Pipe(User.Parse);
     }
 
+    public async ValueTask<User> GetCurrentUserAsync(CancellationToken cancellationToken = default)
+    {
+        var response = await GetJsonResponseAsync("users/@me", cancellationToken);
+        return User.Parse(response);
+    }
+
     public async IAsyncEnumerable<Guild> GetUserGuildsAsync(
         [EnumeratorCancellation] CancellationToken cancellationToken = default
     )
@@ -820,4 +826,96 @@ public class DiscordClient(
                 yield break;
         }
     }
+
+    private async ValueTask<HttpResponseMessage> DeleteResponseAsync(
+        string url,
+        TokenKind tokenKind,
+        CancellationToken cancellationToken = default
+    )
+    {
+        return await Http.ResponseResiliencePipeline.ExecuteAsync(
+            async innerCancellationToken =>
+            {
+                using var request = new HttpRequestMessage(
+                    HttpMethod.Delete,
+                    new Uri(_baseUri, url)
+                );
+
+                request.Headers.TryAddWithoutValidation(
+                    "Authorization",
+                    tokenKind == TokenKind.Bot ? $"Bot {token}" : token
+                );
+
+                var response = await Http.Client.SendAsync(
+                    request,
+                    HttpCompletionOption.ResponseHeadersRead,
+                    innerCancellationToken
+                );
+
+                if (rateLimitPreference.IsRespectedFor(tokenKind))
+                {
+                    var remainingRequestCount = response
+                        .Headers.TryGetValue("X-RateLimit-Remaining")
+                        ?.Pipe(s => int.ParseOrNull(s, CultureInfo.InvariantCulture));
+
+                    var resetAfterDelay = response
+                        .Headers.TryGetValue("X-RateLimit-Reset-After")
+                        ?.Pipe(s => double.ParseOrNull(s, CultureInfo.InvariantCulture))
+                        ?.Pipe(TimeSpan.FromSeconds);
+
+                    if (remainingRequestCount <= 0 && resetAfterDelay is not null)
+                    {
+                        var delay = (resetAfterDelay.Value + TimeSpan.FromSeconds(1)).Clamp(
+                            TimeSpan.Zero,
+                            TimeSpan.FromSeconds(60)
+                        );
+
+                        await Task.Delay(delay, innerCancellationToken);
+                    }
+                }
+
+                return response;
+            },
+            cancellationToken
+        );
+    }
+
+    private async ValueTask<HttpResponseMessage> DeleteResponseAsync(
+        string url,
+        CancellationToken cancellationToken = default
+    ) =>
+        await DeleteResponseAsync(
+            url,
+            await ResolveTokenKindAsync(cancellationToken),
+            cancellationToken
+        );
+
+    public async ValueTask<bool> DeleteMessageAsync(
+        Snowflake channelId,
+        Snowflake messageId,
+        CancellationToken cancellationToken = default
+    )
+    {
+        using var response = await DeleteResponseAsync(
+            $"channels/{channelId}/messages/{messageId}",
+            cancellationToken
+        );
+
+        // 204 No Content = successfully deleted
+        if (response.StatusCode == HttpStatusCode.NoContent)
+            return true;
+
+        // 403 Forbidden = not authorized to delete (e.g., someone else's message)
+        // 404 Not Found = message already deleted or doesn't exist
+        if (
+            response.StatusCode == HttpStatusCode.Forbidden
+            || response.StatusCode == HttpStatusCode.NotFound
+        )
+            return false;
+
+        // For other errors, throw an exception
+        throw new DiscordChatExporterException(
+            $"Failed to delete message #{messageId} in channel #{channelId}: {response.StatusCode}"
+        );
+    }
 }

DiscordChatExporter.Gui/App.axaml.cs

@@ -48,6 +48,7 @@ public partial class App : Application, IDisposable
         services.AddTransient<MainViewModel>();
         services.AddTransient<DashboardViewModel>();
         services.AddTransient<ExportSetupViewModel>();
+        services.AddTransient<DeleteSetupViewModel>();
         services.AddTransient<MessageBoxViewModel>();
         services.AddTransient<SettingsViewModel>();
 

DiscordChatExporter.Gui/Framework/ViewManager.cs

@@ -17,6 +17,7 @@ public partial class ViewManager
             MainViewModel => new MainView(),
             DashboardViewModel => new DashboardView(),
             ExportSetupViewModel => new ExportSetupView(),
+            DeleteSetupViewModel => new DeleteSetupView(),
             MessageBoxViewModel => new MessageBoxView(),
             SettingsViewModel => new SettingsView(),
             _ => null,

DiscordChatExporter.Gui/Framework/ViewModelManager.cs

@@ -29,6 +29,19 @@ public class ViewModelManager(IServiceProvider services, LocalizationManager loc
         return viewModel;
     }
 
+    public DeleteSetupViewModel GetDeleteSetupViewModel(
+        Guild guild,
+        IReadOnlyList<Channel> channels
+    )
+    {
+        var viewModel = services.GetRequiredService<DeleteSetupViewModel>();
+
+        viewModel.Guild = guild;
+        viewModel.Channels = channels;
+
+        return viewModel;
+    }
+
     public MessageBoxViewModel GetMessageBoxViewModel(
         string title,
         string message,

DiscordChatExporter.Gui/Localization/LocalizationManager.English.cs

@@ -11,6 +11,8 @@ public partial class LocalizationManager
             [nameof(PullGuildsTooltip)] = "Pull available servers and channels (Enter)",
             [nameof(SettingsTooltip)] = "Settings",
             [nameof(LastMessageSentTooltip)] = "Last message sent:",
+            [nameof(ExportTooltip)] = "Export selected channels",
+            [nameof(DeleteMessagesTooltip)] = "Delete messages from selected channels",
             [nameof(TokenPlaceholderText)] = "Token",
             // Token instructions (personal account)
             [nameof(TokenPersonalHeader)] = "To get the token for your personal account:",
@@ -123,6 +125,16 @@ public partial class LocalizationManager
                 "Download assets to this directory. If not specified, the asset directory path will be derived from the output path.",
             [nameof(AdvancedOptionsTooltip)] = "Toggle advanced options",
             [nameof(ExportButton)] = "EXPORT",
+            // Delete Setup
+            [nameof(DeleteWarningTitle)] =
+                "⚠ WARNING: This will permanently delete messages from the channel.",
+            [nameof(DeleteWarningSubtext)] =
+                "You can only delete your own messages. Messages from other users will be skipped.",
+            [nameof(DeleteAfterDateTooltip)] = "Only delete messages sent after this date",
+            [nameof(DeleteBeforeDateTooltip)] = "Only delete messages sent before this date",
+            [nameof(DeleteAfterTimeTooltip)] = "Only delete messages sent after this time",
+            [nameof(DeleteBeforeTimeTooltip)] = "Only delete messages sent before this time",
+            [nameof(DeleteButton)] = "DELETE",
             // Common buttons
             [nameof(CloseButton)] = "CLOSE",
             [nameof(CancelButton)] = "CANCEL",
@@ -152,5 +164,7 @@ public partial class LocalizationManager
             [nameof(ErrorPullingChannelsTitle)] = "Error pulling channels",
             [nameof(ErrorExportingTitle)] = "Error exporting channel(s)",
             [nameof(SuccessfulExportMessage)] = "Successfully exported {0} channel(s)",
+            [nameof(ErrorDeletingTitle)] = "Error deleting messages",
+            [nameof(SuccessfulDeletionMessage)] = "Deleted {0} message(s), {1} failed",
         };
 }

DiscordChatExporter.Gui/Localization/LocalizationManager.French.cs

@@ -13,6 +13,8 @@ public partial class LocalizationManager
         [nameof(PullGuildsTooltip)] = "Charger les serveurs et canaux disponibles (Entrée)",
         [nameof(SettingsTooltip)] = "Paramètres",
         [nameof(LastMessageSentTooltip)] = "Dernier message envoyé :",
+        [nameof(ExportTooltip)] = "Exporter les canaux sélectionnés",
+        [nameof(DeleteMessagesTooltip)] = "Supprimer les messages des canaux sélectionnés",
         [nameof(TokenPlaceholderText)] = "Token",
         // Token instructions (personal account)
         [nameof(TokenPersonalHeader)] = "Obtenir le token pour votre compte personnel :",
@@ -125,6 +127,20 @@ public partial class LocalizationManager
             "Télécharger les ressources dans ce dossier. Si non spécifié, le chemin sera dérivé du chemin de sortie.",
         [nameof(AdvancedOptionsTooltip)] = "Basculer les options avancées",
         [nameof(ExportButton)] = "EXPORTER",
+        // Delete Setup
+        [nameof(DeleteWarningTitle)] =
+            "⚠ AVERTISSEMENT : Cette action supprimera définitivement les messages du canal.",
+        [nameof(DeleteWarningSubtext)] =
+            "Vous ne pouvez supprimer que vos propres messages. Les messages des autres utilisateurs seront ignorés.",
+        [nameof(DeleteAfterDateTooltip)] =
+            "Supprimer uniquement les messages envoyés après cette date",
+        [nameof(DeleteBeforeDateTooltip)] =
+            "Supprimer uniquement les messages envoyés avant cette date",
+        [nameof(DeleteAfterTimeTooltip)] =
+            "Supprimer uniquement les messages envoyés après cette heure",
+        [nameof(DeleteBeforeTimeTooltip)] =
+            "Supprimer uniquement les messages envoyés avant cette heure",
+        [nameof(DeleteButton)] = "SUPPRIMER",
         // Common buttons
         [nameof(CloseButton)] = "FERMER",
         [nameof(CancelButton)] = "ANNULER",
@@ -154,5 +170,7 @@ public partial class LocalizationManager
         [nameof(ErrorPullingChannelsTitle)] = "Erreur lors du chargement des canaux",
         [nameof(ErrorExportingTitle)] = "Erreur lors de l'exportation des canaux",
         [nameof(SuccessfulExportMessage)] = "{0} canal(-aux) exporté(s) avec succès",
+        [nameof(ErrorDeletingTitle)] = "Erreur lors de la suppression des messages",
+        [nameof(SuccessfulDeletionMessage)] = "{0} message(s) supprimé(s), {1} échec(s)",
     };
 }

DiscordChatExporter.Gui/Localization/LocalizationManager.German.cs

@@ -13,6 +13,8 @@ public partial class LocalizationManager
         [nameof(PullGuildsTooltip)] = "Verfügbare Server und Kanäle laden (Enter)",
         [nameof(SettingsTooltip)] = "Einstellungen",
         [nameof(LastMessageSentTooltip)] = "Letzte Nachricht gesendet:",
+        [nameof(ExportTooltip)] = "Ausgewählte Kanäle exportieren",
+        [nameof(DeleteMessagesTooltip)] = "Nachrichten aus ausgewählten Kanälen löschen",
         [nameof(TokenPlaceholderText)] = "Token",
         // Token instructions (personal account)
         [nameof(TokenPersonalHeader)] = "Token für Ihr persönliches Konto abrufen:",
@@ -129,6 +131,20 @@ public partial class LocalizationManager
             "Assets in dieses Verzeichnis herunterladen. Wenn nicht angegeben, wird der Asset-Verzeichnispfad vom Ausgabepfad abgeleitet.",
         [nameof(AdvancedOptionsTooltip)] = "Erweiterte Optionen umschalten",
         [nameof(ExportButton)] = "EXPORTIEREN",
+        // Delete Setup
+        [nameof(DeleteWarningTitle)] =
+            "⚠ WARNUNG: Dadurch werden Nachrichten dauerhaft aus dem Kanal gelöscht.",
+        [nameof(DeleteWarningSubtext)] =
+            "Sie können nur Ihre eigenen Nachrichten löschen. Nachrichten anderer Benutzer werden übersprungen.",
+        [nameof(DeleteAfterDateTooltip)] =
+            "Nur Nachrichten löschen, die nach diesem Datum gesendet wurden",
+        [nameof(DeleteBeforeDateTooltip)] =
+            "Nur Nachrichten löschen, die vor diesem Datum gesendet wurden",
+        [nameof(DeleteAfterTimeTooltip)] =
+            "Nur Nachrichten löschen, die nach dieser Uhrzeit gesendet wurden",
+        [nameof(DeleteBeforeTimeTooltip)] =
+            "Nur Nachrichten löschen, die vor dieser Uhrzeit gesendet wurden",
+        [nameof(DeleteButton)] = "LÖSCHEN",
         // Common buttons
         [nameof(CloseButton)] = "SCHLIESSEN",
         [nameof(CancelButton)] = "ABBRECHEN",
@@ -158,5 +174,7 @@ public partial class LocalizationManager
         [nameof(ErrorPullingChannelsTitle)] = "Fehler beim Laden der Kanäle",
         [nameof(ErrorExportingTitle)] = "Fehler beim Exportieren der Kanäle",
         [nameof(SuccessfulExportMessage)] = "{0} Kanal/-äle erfolgreich exportiert",
+        [nameof(ErrorDeletingTitle)] = "Fehler beim Löschen der Nachrichten",
+        [nameof(SuccessfulDeletionMessage)] = "{0} Nachricht(en) gelöscht, {1} fehlgeschlagen",
     };
 }

DiscordChatExporter.Gui/Localization/LocalizationManager.Spanish.cs

@@ -11,6 +11,8 @@ public partial class LocalizationManager
             [nameof(PullGuildsTooltip)] = "Cargar servidores y canales disponibles (Enter)",
             [nameof(SettingsTooltip)] = "Ajustes",
             [nameof(LastMessageSentTooltip)] = "Último mensaje enviado:",
+            [nameof(ExportTooltip)] = "Exportar canales seleccionados",
+            [nameof(DeleteMessagesTooltip)] = "Eliminar mensajes de los canales seleccionados",
             [nameof(TokenPlaceholderText)] = "Token",
             // Token instructions (personal account)
             [nameof(TokenPersonalHeader)] = "Cómo obtener el token para tu cuenta personal:",
@@ -123,6 +125,20 @@ public partial class LocalizationManager
                 "Descargar recursos en este directorio. Si no se especifica, la ruta se derivará de la ruta de salida.",
             [nameof(AdvancedOptionsTooltip)] = "Alternar opciones avanzadas",
             [nameof(ExportButton)] = "EXPORTAR",
+            // Delete Setup
+            [nameof(DeleteWarningTitle)] =
+                "⚠ ADVERTENCIA: Esto eliminará permanentemente los mensajes del canal.",
+            [nameof(DeleteWarningSubtext)] =
+                "Solo puedes eliminar tus propios mensajes. Se omitirán los mensajes de otros usuarios.",
+            [nameof(DeleteAfterDateTooltip)] =
+                "Eliminar solo los mensajes enviados después de esta fecha",
+            [nameof(DeleteBeforeDateTooltip)] =
+                "Eliminar solo los mensajes enviados antes de esta fecha",
+            [nameof(DeleteAfterTimeTooltip)] =
+                "Eliminar solo los mensajes enviados después de esta hora",
+            [nameof(DeleteBeforeTimeTooltip)] =
+                "Eliminar solo los mensajes enviados antes de esta hora",
+            [nameof(DeleteButton)] = "ELIMINAR",
             // Common buttons
             [nameof(CloseButton)] = "CERRAR",
             [nameof(CancelButton)] = "CANCELAR",
@@ -152,5 +168,7 @@ public partial class LocalizationManager
             [nameof(ErrorPullingChannelsTitle)] = "Error al cargar canales",
             [nameof(ErrorExportingTitle)] = "Error al exportar canal(es)",
             [nameof(SuccessfulExportMessage)] = "{0} canal(es) exportado(s) con éxito",
+            [nameof(ErrorDeletingTitle)] = "Error al eliminar mensajes",
+            [nameof(SuccessfulDeletionMessage)] = "{0} mensaje(s) eliminado(s), {1} fallido(s)",
         };
 }

DiscordChatExporter.Gui/Localization/LocalizationManager.Ukrainian.cs

@@ -11,6 +11,8 @@ public partial class LocalizationManager
             [nameof(PullGuildsTooltip)] = "Завантажити доступні сервери та канали (Enter)",
             [nameof(SettingsTooltip)] = "Налаштування",
             [nameof(LastMessageSentTooltip)] = "Останнє повідомлення:",
+            [nameof(ExportTooltip)] = "Експортувати вибрані канали",
+            [nameof(DeleteMessagesTooltip)] = "Видалити повідомлення з вибраних каналів",
             [nameof(TokenPlaceholderText)] = "Токен",
             // Token instructions (personal account)
             [nameof(TokenPersonalHeader)] = "Як отримати токен для персонального акаунту:",
@@ -123,6 +125,19 @@ public partial class LocalizationManager
                 "Завантажувати ресурси до цієї директорії. Якщо не вказано, шлях до директорії ресурсів буде визначено з шляху збереження.",
             [nameof(AdvancedOptionsTooltip)] = "Перемкнути розширені параметри",
             [nameof(ExportButton)] = "ЕКСПОРТУВАТИ",
+            // Delete Setup
+            [nameof(DeleteWarningTitle)] = "⚠ УВАГА: Це назавжди видалить повідомлення з каналу.",
+            [nameof(DeleteWarningSubtext)] =
+                "Ви можете видаляти лише власні повідомлення. Повідомлення інших користувачів буде пропущено.",
+            [nameof(DeleteAfterDateTooltip)] =
+                "Видаляти лише повідомлення, надіслані після цієї дати",
+            [nameof(DeleteBeforeDateTooltip)] =
+                "Видаляти лише повідомлення, надіслані до цієї дати",
+            [nameof(DeleteAfterTimeTooltip)] =
+                "Видаляти лише повідомлення, надіслані після цього часу",
+            [nameof(DeleteBeforeTimeTooltip)] =
+                "Видаляти лише повідомлення, надіслані до цього часу",
+            [nameof(DeleteButton)] = "ВИДАЛИТИ",
             // Common buttons
             [nameof(CloseButton)] = "ЗАКРИТИ",
             [nameof(CancelButton)] = "СКАСУВАТИ",
@@ -151,5 +166,7 @@ public partial class LocalizationManager
             [nameof(ErrorPullingChannelsTitle)] = "Помилка завантаження каналів",
             [nameof(ErrorExportingTitle)] = "Помилка експорту каналу(-ів)",
             [nameof(SuccessfulExportMessage)] = "Успішно експортовано {0} канал(-ів)",
+            [nameof(ErrorDeletingTitle)] = "Помилка видалення повідомлень",
+            [nameof(SuccessfulDeletionMessage)] = "Видалено {0} повідомлення(-ь), {1} не вдалося",
         };
 }

DiscordChatExporter.Gui/Localization/LocalizationManager.cs

@@ -75,6 +75,8 @@ public partial class LocalizationManager
     public string PullGuildsTooltip => Get();
     public string SettingsTooltip => Get();
     public string LastMessageSentTooltip => Get();
+    public string ExportTooltip => Get();
+    public string DeleteMessagesTooltip => Get();
     public string TokenPlaceholderText => Get();
 
     // Token instructions (personal account)
@@ -141,6 +143,16 @@ public partial class LocalizationManager
     public string AdvancedOptionsTooltip => Get();
     public string ExportButton => Get();
 
+    // ---- Delete Setup ----
+
+    public string DeleteWarningTitle => Get();
+    public string DeleteWarningSubtext => Get();
+    public string DeleteAfterDateTooltip => Get();
+    public string DeleteBeforeDateTooltip => Get();
+    public string DeleteAfterTimeTooltip => Get();
+    public string DeleteBeforeTimeTooltip => Get();
+    public string DeleteButton => Get();
+
     // ---- Common buttons ----
 
     public string CloseButton => Get();
@@ -162,4 +174,6 @@ public partial class LocalizationManager
     public string ErrorPullingChannelsTitle => Get();
     public string ErrorExportingTitle => Get();
     public string SuccessfulExportMessage => Get();
+    public string ErrorDeletingTitle => Get();
+    public string SuccessfulDeletionMessage => Get();
 }

DiscordChatExporter.Gui/ViewModels/Components/DashboardViewModel.cs

@@ -56,7 +56,11 @@ public partial class DashboardViewModel : ViewModelBase
             ),
             SelectedChannels.WatchProperty(
                 o => o.Count,
-                _ => ExportCommand.NotifyCanExecuteChanged()
+                _ =>
+                {
+                    ExportCommand.NotifyCanExecuteChanged();
+                    DeleteMessagesCommand.NotifyCanExecuteChanged();
+                }
             )
         );
     }
@@ -66,6 +70,7 @@ public partial class DashboardViewModel : ViewModelBase
     [NotifyCanExecuteChangedFor(nameof(PullGuildsCommand))]
     [NotifyCanExecuteChangedFor(nameof(PullChannelsCommand))]
     [NotifyCanExecuteChangedFor(nameof(ExportCommand))]
+    [NotifyCanExecuteChangedFor(nameof(DeleteMessagesCommand))]
     public partial bool IsBusy { get; set; }
 
     public LocalizationManager LocalizationManager { get; }
@@ -324,6 +329,129 @@ public partial class DashboardViewModel : ViewModelBase
         }
     }
 
+    private bool CanDeleteMessages() =>
+        !IsBusy && _discord is not null && SelectedGuild is not null && SelectedChannels.Any();
+
+    [RelayCommand(CanExecute = nameof(CanDeleteMessages))]
+    private async Task DeleteMessagesAsync()
+    {
+        IsBusy = true;
+
+        try
+        {
+            if (_discord is null || SelectedGuild is null || !SelectedChannels.Any())
+                return;
+
+            var currentUser = await _discord.GetCurrentUserAsync();
+
+            var dialog = _viewModelManager.GetDeleteSetupViewModel(
+                SelectedGuild,
+                SelectedChannels.Select(c => c.Channel).ToArray()
+            );
+
+            if (await _dialogManager.ShowDialogAsync(dialog) != true)
+                return;
+
+            var channelProgressPairs = dialog
+                .Channels!.Select(c => new { Channel = c, Progress = _progressMuxer.CreateInput() })
+                .ToArray();
+
+            var totalDeletedCount = 0;
+            var totalFailedCount = 0;
+
+            await Parallel.ForEachAsync(
+                channelProgressPairs,
+                new ParallelOptions
+                {
+                    MaxDegreeOfParallelism = Math.Max(1, _settingsService.ParallelLimit),
+                },
+                async (pair, cancellationToken) =>
+                {
+                    var channel = pair.Channel;
+                    var progress = pair.Progress;
+
+                    try
+                    {
+                        var userMessageIds = new List<Snowflake>();
+                        await foreach (
+                            var message in _discord.GetMessagesAsync(
+                                channel.Id,
+                                dialog.After?.Pipe(Snowflake.FromDate),
+                                dialog.Before?.Pipe(Snowflake.FromDate),
+                                progress,
+                                cancellationToken
+                            )
+                        )
+                        {
+                            if (message.Author.Id == currentUser.Id)
+                                userMessageIds.Add(message.Id);
+                        }
+
+                        if (userMessageIds.Count == 0)
+                            return;
+
+                        var successCount = 0;
+                        var failedCount = 0;
+
+                        foreach (var messageId in userMessageIds)
+                        {
+                            try
+                            {
+                                var deleted = await _discord.DeleteMessageAsync(
+                                    channel.Id,
+                                    messageId,
+                                    cancellationToken
+                                );
+
+                                if (deleted)
+                                    successCount++;
+                                else
+                                    failedCount++;
+                            }
+                            catch (DiscordChatExporterException ex) when (!ex.IsFatal)
+                            {
+                                failedCount++;
+                                _snackbarManager.Notify(ex.Message.TrimEnd('.'));
+                            }
+                        }
+
+                        Interlocked.Add(ref totalDeletedCount, successCount);
+                        Interlocked.Add(ref totalFailedCount, failedCount);
+                    }
+                    catch (DiscordChatExporterException ex) when (!ex.IsFatal)
+                    {
+                        _snackbarManager.Notify(ex.Message.TrimEnd('.'));
+                    }
+                    finally
+                    {
+                        progress.ReportCompletion();
+                    }
+                }
+            );
+
+            _snackbarManager.Notify(
+                string.Format(
+                    LocalizationManager.SuccessfulDeletionMessage,
+                    totalDeletedCount,
+                    totalFailedCount
+                )
+            );
+        }
+        catch (Exception ex)
+        {
+            var dialog = _viewModelManager.GetMessageBoxViewModel(
+                LocalizationManager.ErrorDeletingTitle,
+                ex.ToString()
+            );
+
+            await _dialogManager.ShowDialogAsync(dialog);
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
     protected override void Dispose(bool disposing)
     {
         if (disposing)

DiscordChatExporter.Gui/ViewModels/Dialogs/DeleteSetupViewModel.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Gui.Framework;
+using DiscordChatExporter.Gui.Localization;
+
+namespace DiscordChatExporter.Gui.ViewModels.Dialogs;
+
+public partial class DeleteSetupViewModel(LocalizationManager localizationManager)
+    : DialogViewModelBase
+{
+    public LocalizationManager LocalizationManager { get; } = localizationManager;
+
+    [ObservableProperty]
+    public partial Guild? Guild { get; set; }
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsSingleChannel))]
+    public partial IReadOnlyList<Channel>? Channels { get; set; }
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsAfterDateSet))]
+    [NotifyPropertyChangedFor(nameof(After))]
+    public partial DateTimeOffset? AfterDate { get; set; }
+
+    [ObservableProperty]
+    public partial TimeSpan? AfterTime { get; set; }
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsBeforeDateSet))]
+    [NotifyPropertyChangedFor(nameof(Before))]
+    public partial DateTimeOffset? BeforeDate { get; set; }
+
+    [ObservableProperty]
+    public partial TimeSpan? BeforeTime { get; set; }
+
+    public bool IsSingleChannel => Channels?.Count == 1;
+
+    public bool IsAfterDateSet => AfterDate is not null;
+
+    public DateTimeOffset? After => AfterDate?.Add(AfterTime ?? TimeSpan.Zero);
+
+    public bool IsBeforeDateSet => BeforeDate is not null;
+
+    public DateTimeOffset? Before => BeforeDate?.Add(BeforeTime ?? TimeSpan.Zero);
+
+    [RelayCommand]
+    private void Confirm()
+    {
+        Close(true);
+    }
+
+    [RelayCommand]
+    private void Cancel()
+    {
+        Close(null);
+    }
+}

DiscordChatExporter.Gui/Views/Components/DashboardView.axaml

@@ -284,24 +284,47 @@
                 </ScrollViewer>
             </Panel>
 
-            <!--  Export button  -->
-            <Button
-                Width="56"
-                Height="56"
-                Margin="32,24"
-                Padding="0"
+            <!--  Action buttons  -->
+            <StackPanel
                 HorizontalAlignment="Right"
                 VerticalAlignment="Bottom"
-                Background="{DynamicResource MaterialSecondaryMidBrush}"
-                Command="{Binding ExportCommand}"
-                Foreground="{DynamicResource MaterialSecondaryMidForegroundBrush}"
-                IsVisible="{Binding $self.IsEffectivelyEnabled}"
-                Theme="{DynamicResource MaterialIconButton}">
-                <materialIcons:MaterialIcon
-                    Width="32"
-                    Height="32"
-                    Kind="Download" />
-            </Button>
+                Margin="32,24"
+                Orientation="Horizontal"
+                Spacing="16">
+                <!--  Delete button  -->
+                <Button
+                    Width="56"
+                    Height="56"
+                    Padding="0"
+                    Background="#FFE74C3C"
+                    Command="{Binding DeleteMessagesCommand}"
+                    Foreground="White"
+                    IsVisible="{Binding $self.IsEffectivelyEnabled}"
+                    Theme="{DynamicResource MaterialIconButton}"
+                    ToolTip.Tip="{Binding LocalizationManager.DeleteMessagesTooltip}">
+                    <materialIcons:MaterialIcon
+                        Width="32"
+                        Height="32"
+                        Kind="Delete" />
+                </Button>
+
+                <!--  Export button  -->
+                <Button
+                    Width="56"
+                    Height="56"
+                    Padding="0"
+                    Background="{DynamicResource MaterialSecondaryMidBrush}"
+                    Command="{Binding ExportCommand}"
+                    Foreground="{DynamicResource MaterialSecondaryMidForegroundBrush}"
+                    IsVisible="{Binding $self.IsEffectivelyEnabled}"
+                    Theme="{DynamicResource MaterialIconButton}"
+                    ToolTip.Tip="{Binding LocalizationManager.ExportTooltip}">
+                    <materialIcons:MaterialIcon
+                        Width="32"
+                        Height="32"
+                        Kind="Download" />
+                </Button>
+            </StackPanel>
         </Panel>
     </DockPanel>
 </UserControl>

DiscordChatExporter.Gui/Views/Dialogs/DeleteSetupView.axaml

@@ -0,0 +1,180 @@
+<UserControl
+    x:Class="DiscordChatExporter.Gui.Views.Dialogs.DeleteSetupView"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:asyncImageLoader="clr-namespace:AsyncImageLoader;assembly=AsyncImageLoader.Avalonia"
+    xmlns:converters="clr-namespace:DiscordChatExporter.Gui.Converters"
+    xmlns:dialogs="clr-namespace:DiscordChatExporter.Gui.ViewModels.Dialogs"
+    xmlns:materialAssists="clr-namespace:Material.Styles.Assists;assembly=Material.Styles"
+    xmlns:utils="clr-namespace:DiscordChatExporter.Gui.Utils"
+    x:Name="UserControl"
+    Width="380"
+    x:DataType="dialogs:DeleteSetupViewModel"
+    Loaded="UserControl_OnLoaded">
+    <Grid RowDefinitions="Auto,*,Auto">
+        <!--  Guild/channel info  -->
+        <Grid
+            Grid.Row="0"
+            Margin="16"
+            ColumnDefinitions="Auto,*">
+            <!--  Guild icon  -->
+            <Ellipse
+                Grid.Column="0"
+                Width="32"
+                Height="32">
+                <Ellipse.Fill>
+                    <ImageBrush asyncImageLoader:ImageBrushLoader.Source="{Binding Guild.IconUrl}" />
+                </Ellipse.Fill>
+            </Ellipse>
+
+            <!--  Channel count (for multiple channels)  -->
+            <TextBlock
+                Grid.Column="1"
+                Margin="8,0,0,0"
+                VerticalAlignment="Center"
+                FontSize="19"
+                FontWeight="Light"
+                IsVisible="{Binding !IsSingleChannel}"
+                TextTrimming="CharacterEllipsis">
+                <Run Text="{Binding Channels.Count, FallbackValue=0, Mode=OneWay}" />
+                <Run Text="{Binding LocalizationManager.ChannelsSelectedText}" />
+            </TextBlock>
+
+            <!--  Category and channel name (for single channel)  -->
+            <TextBlock
+                Grid.Column="1"
+                Margin="8,0,0,0"
+                VerticalAlignment="Center"
+                FontSize="19"
+                FontWeight="Light"
+                IsVisible="{Binding IsSingleChannel}"
+                TextTrimming="CharacterEllipsis"
+                ToolTip.Tip="{Binding Channels[0], Converter={x:Static converters:ChannelToHierarchicalNameStringConverter.Instance}}">
+                <TextBlock IsVisible="{Binding !!Channels[0].Parent}">
+                    <Run Text="{Binding Channels[0].Parent.Name, Mode=OneWay}" />
+                    <Run Text="/" />
+                </TextBlock>
+                <Run FontWeight="SemiBold" Text="{Binding Channels[0].Name, Mode=OneWay}" />
+            </TextBlock>
+        </Grid>
+
+        <Border
+            Grid.Row="1"
+            Padding="0,8"
+            BorderBrush="{DynamicResource MaterialDividerBrush}"
+            BorderThickness="0,1">
+            <ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
+                <StackPanel Orientation="Vertical">
+                    <!--  Warning message  -->
+                    <Border
+                        Margin="16,8"
+                        Padding="12"
+                        Background="#33FFA500"
+                        BorderBrush="#FFFFA500"
+                        BorderThickness="2"
+                        CornerRadius="4">
+                        <TextBlock
+                            FontSize="13"
+                            FontWeight="SemiBold"
+                            Foreground="#FFFFA500"
+                            TextWrapping="Wrap">
+                            <Run Text="{Binding LocalizationManager.DeleteWarningTitle}" />
+                            <LineBreak />
+                            <Run FontWeight="Normal" Text="{Binding LocalizationManager.DeleteWarningSubtext}" />
+                        </TextBlock>
+                    </Border>
+
+                    <!--  Date limits  -->
+                    <Grid ColumnDefinitions="*,*" RowDefinitions="*,*">
+                        <DatePicker
+                            Grid.Row="0"
+                            Grid.Column="0"
+                            Margin="16,8,8,8"
+                            materialAssists:TextFieldAssist.Label="{Binding LocalizationManager.AfterDateLabel}"
+                            SelectedDate="{Binding AfterDate}"
+                            ToolTip.Tip="{Binding LocalizationManager.DeleteAfterDateTooltip}">
+                            <DatePicker.Styles>
+                                <Style Selector="DatePicker">
+                                    <Style Selector="^ /template/ TextBox#DisplayTextBox">
+                                        <Setter Property="Theme" Value="{DynamicResource FilledTextBox}" />
+                                    </Style>
+                                </Style>
+                            </DatePicker.Styles>
+                        </DatePicker>
+                        <DatePicker
+                            Grid.Row="0"
+                            Grid.Column="1"
+                            Margin="8,8,16,8"
+                            materialAssists:TextFieldAssist.Label="{Binding LocalizationManager.BeforeDateLabel}"
+                            SelectedDate="{Binding BeforeDate}"
+                            ToolTip.Tip="{Binding LocalizationManager.DeleteBeforeDateTooltip}">
+                            <DatePicker.Styles>
+                                <Style Selector="DatePicker">
+                                    <Style Selector="^ /template/ TextBox#DisplayTextBox">
+                                        <Setter Property="Theme" Value="{DynamicResource FilledTextBox}" />
+                                    </Style>
+                                </Style>
+                            </DatePicker.Styles>
+                        </DatePicker>
+
+                        <!--  Time limits  -->
+                        <TimePicker
+                            Grid.Row="1"
+                            Grid.Column="0"
+                            Margin="16,8,8,8"
+                            materialAssists:TextFieldAssist.Label="{Binding LocalizationManager.AfterTimeLabel}"
+                            ClockIdentifier="{x:Static utils:Internationalization.AvaloniaClockIdentifier}"
+                            IsEnabled="{Binding IsAfterDateSet}"
+                            SelectedTime="{Binding AfterTime}"
+                            ToolTip.Tip="{Binding LocalizationManager.DeleteAfterTimeTooltip}">
+                            <TimePicker.Styles>
+                                <Style Selector="TimePicker">
+                                    <Style Selector="^ /template/ TextBox#PART_DisplayTextBox">
+                                        <Setter Property="Theme" Value="{DynamicResource FilledTextBox}" />
+                                    </Style>
+                                </Style>
+                            </TimePicker.Styles>
+                        </TimePicker>
+                        <TimePicker
+                            Grid.Row="1"
+                            Grid.Column="1"
+                            Margin="8,8,16,8"
+                            materialAssists:TextFieldAssist.Label="{Binding LocalizationManager.BeforeTimeLabel}"
+                            ClockIdentifier="{x:Static utils:Internationalization.AvaloniaClockIdentifier}"
+                            IsEnabled="{Binding IsBeforeDateSet}"
+                            SelectedTime="{Binding BeforeTime}"
+                            ToolTip.Tip="{Binding LocalizationManager.DeleteBeforeTimeTooltip}">
+                            <TimePicker.Styles>
+                                <Style Selector="TimePicker">
+                                    <Style Selector="^ /template/ TextBox#PART_DisplayTextBox">
+                                        <Setter Property="Theme" Value="{DynamicResource FilledTextBox}" />
+                                    </Style>
+                                </Style>
+                            </TimePicker.Styles>
+                        </TimePicker>
+                    </Grid>
+                </StackPanel>
+            </ScrollViewer>
+        </Border>
+
+        <!--  Buttons  -->
+        <Grid
+            Grid.Row="2"
+            Margin="16"
+            ColumnDefinitions="*,Auto,Auto">
+            <Button
+                Grid.Column="1"
+                Command="{Binding ConfirmCommand}"
+                Content="{Binding LocalizationManager.DeleteButton}"
+                IsDefault="True"
+                Theme="{DynamicResource MaterialOutlineButton}" />
+            <Button
+                Grid.Column="2"
+                Margin="16,0,0,0"
+                Command="{Binding CancelCommand}"
+                Content="{Binding LocalizationManager.CancelButton}"
+                IsCancel="True"
+                Theme="{DynamicResource MaterialOutlineButton}" />
+        </Grid>
+    </Grid>
+</UserControl>

DiscordChatExporter.Gui/Views/Dialogs/DeleteSetupView.axaml.cs

@@ -0,0 +1,20 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+
+namespace DiscordChatExporter.Gui.Views.Dialogs;
+
+public partial class DeleteSetupView : UserControl
+{
+    public DeleteSetupView()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent() => AvaloniaXamlLoader.Load(this);
+
+    private void UserControl_OnLoaded(object? sender, RoutedEventArgs args)
+    {
+        // Nothing to do on load for now
+    }
+}