Added initial ability to enable anti-spam mode in megagroups.

Telegram/CMakeLists.txt

@@ -980,6 +980,8 @@ PRIVATE
     media/view/media_view_playback_progress.cpp
     media/view/media_view_playback_progress.h
     media/view/media_view_open_common.h
+    menu/menu_antispam_validator.cpp
+    menu/menu_antispam_validator.h
     menu/menu_item_download_files.cpp
     menu/menu_item_download_files.h
     menu/menu_mute.cpp

Telegram/Resources/langs/lang.strings

@@ -1269,6 +1269,11 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_manage_peer_reactions_some_title" = "Only allow these reactions";
 "lng_manage_peer_reactions_available" = "Available reactions";
 
+"lng_manage_peer_antispam" = "Aggressive Anti-Spam";
+"lng_manage_peer_antispam_about" = "Telegram will filter more spam but may occasionally affect ordinary messages. You can report False Positives in Recent Actions.";
+"lng_manage_peer_antispam_not_enough#one" = "Aggressive filtering can be enabled only in groups with more than **{count} member**.";
+"lng_manage_peer_antispam_not_enough#other" = "Aggressive filtering can be enabled only in groups with more than **{count} members**.";
+
 "lng_manage_peer_group_type" = "Group type";
 "lng_manage_peer_channel_type" = "Channel type";
 "lng_manage_peer_link_type" = "Link type";

Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp

@@ -16,6 +16,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "boxes/max_invite_box.h"
 #include "boxes/add_contact_box.h"
 #include "main/main_session.h"
+#include "menu/menu_antispam_validator.h"
 #include "mtproto/mtproto_config.h"
 #include "apiwrap.h"
 #include "lang/lang_keys.h"
@@ -1186,6 +1187,12 @@ void ParticipantsBoxController::prepare() {
 		}
 		Unexpected("Role in ParticipantsBoxController::prepare()");
 	}();
+	if ((_role == Role::Admins) && _peer->isMegagroup()) {
+		const auto validator = AntiSpamMenu::AntiSpamValidator(
+			_navigation->parentController(),
+			_peer->asChannel());
+		delegate()->peerListSetAboveWidget(validator.createButton());
+	}
 	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
 	delegate()->peerListSetTitle(std::move(title));
 	setDescriptionText(tr::lng_contacts_loading(tr::now));

Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp

@@ -863,8 +863,7 @@ void Controller::fillForumButton() {
 				ShowForumForDiscussionError(_navigation);
 			} else {
 				Ui::ShowMultilineToast({
-					.parentOverride = Window::Show(
-						_navigation).toastParent(),
+					.parentOverride = Window::Show(_navigation).toastParent(),
 					.text = tr::lng_forum_topics_not_enough(
 						tr::now,
 						lt_count,

Telegram/SourceFiles/menu/menu_antispam_validator.cpp

@@ -0,0 +1,111 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "menu/menu_antispam_validator.h"
+
+#include "apiwrap.h"
+#include "boxes/peers/edit_peer_info_box.h"
+#include "data/data_changes.h"
+#include "data/data_channel.h"
+#include "lang/lang_keys.h"
+#include "main/main_account.h"
+#include "main/main_app_config.h"
+#include "main/main_session.h"
+#include "settings/settings_common.h"
+#include "ui/text/text_utilities.h"
+#include "ui/toasts/common_toasts.h"
+#include "ui/widgets/buttons.h"
+#include "ui/wrap/slide_wrap.h"
+#include "ui/wrap/vertical_layout.h"
+#include "window/window_session_controller.h"
+#include "styles/style_info.h"
+#include "styles/style_settings.h"
+
+namespace AntiSpamMenu {
+namespace {
+
+[[nodiscard]] int EnableAntiSpamMinMembers(not_null<ChannelData*> channel) {
+	return channel->session().account().appConfig().get<int>(
+		u"telegram_antispam_group_size_min"_q,
+		100);
+}
+
+} // namespace
+
+AntiSpamValidator::AntiSpamValidator(
+	not_null<Window::SessionController*> controller,
+	not_null<ChannelData*> channel)
+: _channel(channel)
+, _controller(controller) {
+}
+
+object_ptr<Ui::RpWidget> AntiSpamValidator::createButton() const {
+	const auto channel = _channel;
+	auto container = object_ptr<Ui::SlideWrap<Ui::VerticalLayout>>(
+		(QWidget*)nullptr,
+		object_ptr<Ui::VerticalLayout>((QWidget*)nullptr));
+	struct State {
+		rpl::variable<bool> locked;
+		rpl::event_stream<bool> toggled;
+	};
+	Settings::AddSkip(container->entity());
+	const auto state = container->lifetime().make_state<State>();
+	const auto button = container->entity()->add(
+		EditPeerInfoBox::CreateButton(
+			container->entity(),
+			tr::lng_manage_peer_antispam(),
+			rpl::single(QString()),
+			[] {},
+			st::manageGroupTopicsButton,
+			{ &st::infoRoundedIconAdministrators, Settings::kIconPurple }
+	))->toggleOn(rpl::single(
+		_channel->antiSpamMode()
+	) | rpl::then(state->toggled.events()));
+	container->show(anim::type::instant);
+	Settings::AddDividerText(
+		container->entity(),
+		tr::lng_manage_peer_antispam_about());
+
+	const auto updateLocked = [=] {
+		const auto &config = channel->session().account().appConfig();
+		const auto min = EnableAntiSpamMinMembers(channel);
+		const auto locked = (channel->membersCount() <= min);
+		state->locked = locked;
+		button->setToggleLocked(locked);
+	};
+	using UpdateFlag = Data::PeerUpdate::Flag;
+	_channel->session().changes().peerUpdates(
+		_channel,
+		UpdateFlag::Members | UpdateFlag::Admins
+	) | rpl::start_with_next(updateLocked, button->lifetime());
+	updateLocked();
+	button->toggledValue(
+	) | rpl::start_with_next([=, controller = _controller](bool toggled) {
+		if (state->locked.current() && toggled) {
+			state->toggled.fire(false);
+			Ui::ShowMultilineToast({
+				.parentOverride = Window::Show(controller).toastParent(),
+				.text = tr::lng_manage_peer_antispam_not_enough(
+					tr::now,
+					lt_count,
+					EnableAntiSpamMinMembers(channel),
+					Ui::Text::RichLangValue),
+			});
+		} else {
+			channel->session().api().request(MTPchannels_ToggleAntiSpam(
+				channel->inputChannel,
+				MTP_bool(toggled)
+			)).done([=](const MTPUpdates &result) {
+				channel->session().api().applyUpdates(result);
+			}).send();
+		}
+	}, button->lifetime());
+
+	return container;
+}
+
+} // namespace AntiSpamMenu

Telegram/SourceFiles/menu/menu_antispam_validator.h

@@ -0,0 +1,39 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+template <typename Object>
+class object_ptr;
+
+class ChannelData;
+
+namespace Ui {
+class RpWidget;
+} // namespace Ui
+
+namespace Window {
+class SessionController;
+} // namespace Window
+
+namespace AntiSpamMenu {
+
+class AntiSpamValidator final {
+public:
+	AntiSpamValidator(
+		not_null<Window::SessionController*> controller,
+		not_null<ChannelData*> channel);
+
+	[[nodiscard]] object_ptr<Ui::RpWidget> createButton() const;
+
+private:
+	const not_null<ChannelData*> _channel;
+	const not_null<Window::SessionController*> _controller;
+
+};
+
+} // namespace AntiSpamMenu

Telegram/SourceFiles/menu/menu_ttl_validator.h

@@ -13,7 +13,6 @@ class PeerData;
 
 namespace Ui {
 class Show;
-class RpWidget;
 } // namespace Ui
 
 namespace TTLMenu {