Show unofficial app warning.

Telegram/Resources/langs/lang.strings

@@ -1603,6 +1603,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_profile_saved_messages#other" = "{count} saved messages";
 "lng_profile_peer_gifts#one" = "{count} gift";
 "lng_profile_peer_gifts#other" = "{count} gifts";
+"lng_profile_unofficial_warning" = "{icon} {name} uses an unofficial Telegram client — messages to this user may be less secure.";
 "lng_profile_participants_section" = "Members";
 "lng_profile_subscribers_section" = "Subscribers";
 "lng_profile_add_contact" = "Add Contact";

Telegram/SourceFiles/data/data_user.cpp

@@ -892,7 +892,8 @@ void ApplyUserUpdate(not_null<UserData*> user, const MTPDuserFull &update) {
 			: Flag())
 		| (user->starsPerMessage() ? Flag::HasStarsPerMessage : Flag())
 		| Flag::MessageMoneyRestrictionsKnown
-		| Flag::RequiresPremiumToWrite;
+		| Flag::RequiresPremiumToWrite
+		| Flag::UnofficialSecurityRisk;
 	user->setFlags((user->flags() & ~mask)
 		| (update.is_phone_calls_private()
 			? Flag::PhoneCallsPrivate
@@ -908,6 +909,9 @@ void ApplyUserUpdate(not_null<UserData*> user, const MTPDuserFull &update) {
 		| Flag::MessageMoneyRestrictionsKnown
 		| (update.is_contact_require_premium()
 			? (Flag::RequiresPremiumToWrite | Flag::HasRequirePremiumToWrite)
+			: Flag())
+		| (update.is_unofficial_security_risk()
+			? Flag::UnofficialSecurityRisk
 			: Flag()));
 	user->setIsBlocked(update.is_blocked());
 	user->setCallsStatus(update.is_phone_calls_private()

Telegram/SourceFiles/data/data_user.h

@@ -130,7 +130,7 @@ enum class UserDataFlag : uint32 {
 	DiscardMinPhoto = (1 << 12),
 	Self = (1 << 13),
 	Premium = (1 << 14),
-	//CanReceiveGifts = (1 << 15),
+	UnofficialSecurityRisk = (1 << 15),
 	VoiceMessagesForbidden = (1 << 16),
 	PersonalPhoto = (1 << 17),
 	StoriesHidden = (1 << 18),
@@ -303,6 +303,10 @@ public:
 	[[nodiscard]] UserId botManagerId() const;
 	void setBotManagerId(UserId managerId);
 
+	[[nodiscard]] bool unofficialSecurityRisk() const {
+		return flags() & Flag::UnofficialSecurityRisk;
+	}
+
 	[[nodiscard]] MTPInputUser inputUser() const;
 
 	QString firstName;

Telegram/SourceFiles/info/info.style

@@ -1463,3 +1463,6 @@ infoMusicButtonRipple: universalRippleAnimation;
 infoMusicButtonPadding: margins(16px, 6px, 13px, 6px);
 
 memberTagPillPadding: margins(5px, -1px, 5px, 0px);
+
+infoSecurityRiskIconSize: 16px;
+infoSecurityRiskIconMargin: margins(0px, 2px, 0px, 0px);

Telegram/SourceFiles/info/profile/info_profile_inner_widget.cpp

@@ -33,14 +33,17 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "apiwrap.h"
 #include "api/api_peer_photo.h"
 #include "lang/lang_keys.h"
+#include "ui/text/custom_emoji_helper.h"
 #include "ui/text/format_song_document_name.h"
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/checkbox.h"
+#include "ui/widgets/labels.h"
 #include "ui/widgets/scroll_area.h"
 #include "ui/widgets/shadow.h"
 #include "ui/wrap/fade_wrap.h"
 #include "ui/wrap/vertical_layout.h"
 #include "ui/wrap/slide_wrap.h"
+#include "ui/painter.h"
 #include "ui/vertical_list.h"
 #include "ui/ui_utility.h"
 #include "styles/style_info.h"
@@ -79,6 +82,68 @@ void AddAboutVerification(
 	}, inner->lifetime());
 }
 
+void AddUnofficialSecurityRiskWarning(
+		not_null<Ui::VerticalLayout*> container,
+		not_null<UserData*> user) {
+	const auto content = container->add(
+		object_ptr<Ui::VerticalLayout>(container));
+	user->session().changes().peerFlagsValue(
+		user,
+		Data::PeerUpdate::Flag::FullInfo
+	) | rpl::on_next([=] {
+		while (content->count()) {
+			delete content->widgetAt(0);
+		}
+		if (user->unofficialSecurityRisk()) {
+			auto helper = Ui::Text::CustomEmojiHelper();
+			auto icon = helper.paletteDependent({
+				.factory = [] {
+					const auto s = st::infoSecurityRiskIconSize;
+					const auto ratio = style::DevicePixelRatio();
+					const auto rect = QRect(0, 0, s, s);
+					auto result = QImage(
+						rect.size() * ratio,
+						QImage::Format_ARGB32_Premultiplied);
+					result.setDevicePixelRatio(ratio);
+					result.fill(Qt::transparent);
+
+					auto p = QPainter(&result);
+					auto hq = PainterHighQualityEnabler(p);
+					p.setPen(Qt::NoPen);
+					p.setBrush(st::attentionButtonFg);
+					p.drawEllipse(rect);
+
+					p.setPen(st::windowFgActive);
+					p.setFont(st::semiboldFont);
+					p.drawText(rect, u"!"_q, style::al_center);
+
+					p.end();
+					return result;
+				},
+				.margin = st::infoSecurityRiskIconMargin,
+			});
+			auto label = object_ptr<Ui::FlatLabel>(
+				content,
+				tr::lng_profile_unofficial_warning(
+					lt_icon,
+					rpl::single(std::move(icon)),
+					lt_name,
+					rpl::single(TextWithEntities{ user->firstName }),
+					tr::marked),
+				st::defaultDividerLabel.label,
+				st::defaultPopupMenu,
+				helper.context([=] { content->update(); }));
+			content->add(object_ptr<Ui::DividerLabel>(
+				content,
+				std::move(label),
+				st::defaultBoxDividerLabelPadding,
+				st::defaultDividerLabel.bar,
+				RectPart::Top | RectPart::Bottom));
+		}
+		content->resizeToWidth(content->width());
+	}, content->lifetime());
+}
+
 } // namespace
 
 InnerWidget::InnerWidget(
@@ -125,6 +190,9 @@ object_ptr<Ui::RpWidget> InnerWidget::setupContent(
 
 	auto result = object_ptr<Ui::VerticalLayout>(parent);
 	setupSavedMusic(result);
+	if (const auto user = _peer->asUser()) {
+		AddUnofficialSecurityRiskWarning(result.data(), user);
+	}
 	if (_topic && _topic->creating()) {
 		return result;
 	}