Use channels.exportMessageLink to check links.

Telegram/SourceFiles/apiwrap.cpp

@@ -615,6 +615,46 @@ void ApiWrap::finalizeMessageDataRequest(
 	}
 }
 
+QString ApiWrap::exportDirectMessageLink(not_null<HistoryItem*> item) {
+	Expects(item->history()->peer->isChannel());
+
+	const auto itemId = item->fullId();
+	const auto channel = item->history()->peer->asChannel();
+	const auto fallback = [&] {
+		const auto base = channel->isPublic()
+			? channel->username
+			: "c/" + QString::number(channel->bareId());
+		const auto query = base + '/' + QString::number(item->id);
+		if (channel->isPublic() && !channel->isMegagroup()) {
+			if (const auto media = item->media()) {
+				if (const auto document = media->document()) {
+					if (document->isVideoMessage()) {
+						return qsl("https://telesco.pe/") + query;
+					}
+				}
+			}
+		}
+		return Core::App().createInternalLinkFull(query);
+	};
+	const auto i = _unlikelyMessageLinks.find(itemId);
+	const auto current = (i != end(_unlikelyMessageLinks))
+		? i->second
+		: fallback();
+	request(MTPchannels_ExportMessageLink(
+		channel->inputChannel,
+		MTP_int(item->id),
+		MTP_bool(false)
+	)).done([=](const MTPExportedMessageLink &result) {
+		const auto link = result.match([&](const auto &data) {
+			return qs(data.vlink);
+		});
+		if (current != link) {
+			_unlikelyMessageLinks.emplace_or_assign(itemId, link);
+		}
+	}).send();
+	return current;
+}
+
 void ApiWrap::requestContacts() {
 	if (_session->data().contactsLoaded().value() || _contactsRequestId) {
 		return;
@@ -5711,11 +5751,11 @@ void ApiWrap::sendPollVotes(
 	_pollVotesRequestIds.emplace(itemId, requestId);
 }
 
-void ApiWrap::closePoll(FullMsgId itemId) {
+void ApiWrap::closePoll(not_null<HistoryItem*> item) {
+	const auto itemId = item->fullId();
 	if (_pollCloseRequestIds.contains(itemId)) {
 		return;
 	}
-	const auto item = App::histItemById(itemId);
 	const auto media = item ? item->media() : nullptr;
 	const auto poll = media ? media->poll() : nullptr;
 	if (!poll) {

Telegram/SourceFiles/apiwrap.h

@@ -76,6 +76,7 @@ public:
 		ChannelData *channel,
 		MsgId msgId,
 		RequestMessageDataCallback callback);
+	QString exportDirectMessageLink(not_null<HistoryItem*> item);
 
 	void requestContacts();
 	void requestDialogEntry(not_null<Data::Feed*> feed);
@@ -427,7 +428,7 @@ public:
 	void sendPollVotes(
 		FullMsgId itemId,
 		const std::vector<QByteArray> &options);
-	void closePoll(FullMsgId itemId);
+	void closePoll(not_null<HistoryItem*> item);
 	void reloadPollResults(not_null<HistoryItem*> item);
 
 	~ApiWrap();
@@ -822,4 +823,6 @@ private:
 
 	mtpRequestId _attachedStickerSetsRequestId = 0;
 
+	base::flat_map<FullMsgId, QString> _unlikelyMessageLinks;
+
 };

Telegram/SourceFiles/history/history_item.cpp

@@ -552,29 +552,6 @@ bool HistoryItem::hasDirectLink() const {
 	return IsServerMsgId(id) && _history->peer->isChannel();
 }
 
-QString HistoryItem::directLink() const {
-	if (hasDirectLink()) {
-		const auto channel = _history->peer->asChannel();
-		Assert(channel != nullptr);
-
-		const auto base = channel->isPublic()
-			? channel->username
-			: "c/" + QString::number(channel->bareId());
-		const auto query = base + '/' + QString::number(id);
-		if (channel->isPublic() && !channel->isMegagroup()) {
-			if (const auto media = this->media()) {
-				if (const auto document = media->document()) {
-					if (document->isVideoMessage()) {
-						return qsl("https://telesco.pe/") + query;
-					}
-				}
-			}
-		}
-		return Core::App().createInternalLinkFull(query);
-	}
-	return QString();
-}
-
 ChannelId HistoryItem::channelId() const {
 	return _history->channelId();
 }

Telegram/SourceFiles/history/history_item.h

@@ -254,7 +254,6 @@ public:
 	bool suggestDeleteAllReport() const;
 
 	bool hasDirectLink() const;
-	QString directLink() const;
 
 	MsgId id;
 

Telegram/SourceFiles/history/view/history_view_context_menu.cpp

@@ -38,6 +38,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace HistoryView {
 namespace {
 
+// If we can't cloud-export link for such time we export it locally.
+constexpr auto kExportLocalTimeout = crl::time(1000);
+
 void AddToggleGroupingAction(
 		not_null<Ui::PopupMenu*> menu,
 		not_null<PeerData*> peer) {
@@ -506,26 +509,33 @@ base::unique_qptr<Ui::PopupMenu> FillContextMenu(
 }
 
 void CopyPostLink(FullMsgId itemId) {
-	if (const auto item = App::histItemById(itemId)) {
-		if (item->hasDirectLink()) {
-			QApplication::clipboard()->setText(item->directLink());
-
-			const auto channel = item->history()->peer->asChannel();
-			Assert(channel != nullptr);
-
-			Ui::Toast::Show(lang(channel->isPublic()
-				? lng_channel_public_link_copied
-				: lng_context_about_private_link));
-		}
+	const auto item = App::histItemById(itemId);
+	if (!item || !item->hasDirectLink()) {
+		return;
 	}
+	QApplication::clipboard()->setText(
+		item->history()->session().api().exportDirectMessageLink(item));
+
+	const auto channel = item->history()->peer->asChannel();
+	Assert(channel != nullptr);
+
+	Ui::Toast::Show(lang(channel->isPublic()
+		? lng_channel_public_link_copied
+		: lng_context_about_private_link));
 }
 
 void StopPoll(FullMsgId itemId) {
+	const auto stop = [=] {
+		Ui::hideLayer();
+		if (const auto item = App::histItemById(itemId)) {
+			item->history()->session().api().closePoll(item);
+		}
+	};
 	Ui::show(Box<ConfirmBox>(
 		lang(lng_polls_stop_warning),
 		lang(lng_polls_stop_sure),
 		lang(lng_cancel),
-		[=] { Ui::hideLayer(); Auth().api().closePoll(itemId); }));
+		stop));
 }
 
 } // namespace HistoryView