Handle chat link clicks.

Telegram/SourceFiles/core/local_url_handlers.cpp

@@ -977,6 +977,24 @@ bool ResolveBoost(
 	return true;
 }
 
+bool ResolveChatLink(
+		Window::SessionController *controller,
+		const Match &match,
+		const QVariant &context) {
+	if (!controller) {
+		return false;
+	}
+	const auto myContext = context.value<ClickHandlerContext>();
+	const auto slug = match->captured(1);
+	controller->window().activate();
+	controller->showPeerByLink(Window::PeerByLinkInfo{
+		.chatLinkSlug = match->captured(1),
+		.clickFromMessageId = myContext.itemId,
+		.clickFromAttachBotWebviewUrl = myContext.attachBotWebviewUrl,
+	});
+	return true;
+}
+
 } // namespace
 
 const std::vector<LocalUrlHandler> &LocalUrlHandlers() {
@@ -1046,11 +1064,11 @@ const std::vector<LocalUrlHandler> &LocalUrlHandlers() {
 			ResolveTestChatTheme,
 		},
 		{
-			u"invoice/?\\?(.+)(#|$)"_q,
+			u"^invoice/?\\?(.+)(#|$)"_q,
 			ResolveInvoice,
 		},
 		{
-			u"premium_offer/?(\\?.+)?(#|$)"_q,
+			u"^premium_offer/?(\\?.+)?(#|$)"_q,
 			ResolvePremiumOffer,
 		},
 		{
@@ -1065,6 +1083,10 @@ const std::vector<LocalUrlHandler> &LocalUrlHandlers() {
 			u"^boost/?\\?(.+)(#|$)"_q,
 			ResolveBoost,
 		},
+		{
+			u"^message/?\\?slug=([a-zA-Z0-9\\.\\_]+)(&|$)"_q,
+			ResolveChatLink
+		},
 		{
 			u"^([^\\?]+)(\\?|#|$)"_q,
 			HandleUnknown
@@ -1176,6 +1198,9 @@ QString TryConvertUrlToLocal(QString url) {
 				? "gradient"
 				: "slug";
 			return u"tg://bg?"_q + type + '=' + bg + (params.isEmpty() ? QString() : '&' + params);
+		} else if (const auto chatlinkMatch = regex_match(u"^m/([a-zA-Z0-9\\.\\_\\-]+)(\\?|$)"_q, query, matchOptions)) {
+			const auto slug = chatlinkMatch->captured(1);
+			return u"tg://message?slug="_q + slug;
 		} else if (const auto privateMatch = regex_match(u"^"
 			"c/(\\-?\\d+)"
 			"("

Telegram/SourceFiles/data/data_drafts.cpp

@@ -14,6 +14,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history_widget.h"
 #include "history/history_item_components.h"
 #include "main/main_session.h"
+#include "data/data_changes.h"
 #include "data/data_session.h"
 #include "data/data_web_page.h"
 #include "mainwidget.h"
@@ -128,4 +129,29 @@ void ClearPeerCloudDraft(
 	history->applyCloudDraft(topicRootId);
 }
 
+void SetChatLinkDraft(
+		not_null<PeerData*> peer,
+		const TextWithEntities &draft) {
+	const auto textWithTags = TextWithTags{
+		draft.text,
+		TextUtilities::ConvertEntitiesToTextTags(draft.entities)
+	};
+	const auto cursor = MessageCursor{
+		int(textWithTags.text.size()),
+		int(textWithTags.text.size()),
+		Ui::kQFixedMax
+	};
+	const auto history = peer->owner().history(peer->id);
+	const auto topicRootId = MsgId();
+	history->setLocalDraft(std::make_unique<Data::Draft>(
+		textWithTags,
+		FullReplyTo{ .topicRootId = topicRootId },
+		cursor,
+		Data::WebPageDraft()));
+	history->clearLocalEditDraft(topicRootId);
+	history->session().changes().entryUpdated(
+		history,
+		Data::EntryUpdate::Flag::LocalDraftSet);
+}
+
 } // namespace Data

Telegram/SourceFiles/data/data_drafts.h

@@ -205,4 +205,8 @@ using HistoryDrafts = base::flat_map<DraftKey, std::unique_ptr<Draft>>;
 		&& (a->webpage == b->webpage);
 }
 
+void SetChatLinkDraft(
+	not_null<PeerData*> peer,
+	const TextWithEntities &draft);
+
 } // namespace Data

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "window/window_session_controller.h"
 
+#include "api/api_text_entities.h"
 #include "boxes/add_contact_box.h"
 #include "boxes/peers/add_bot_to_chat_box.h"
 #include "boxes/peers/edit_peer_info_box.h"
@@ -307,6 +308,13 @@ void SessionNavigation::showPeerByLink(const PeerByLinkInfo &info) {
 		resolvePhone(info.phone, [=](not_null<PeerData*> peer) {
 			showPeerByLinkResolved(peer, info);
 		});
+	} else if (!info.chatLinkSlug.isEmpty()) {
+		resolveChatLink(info.chatLinkSlug, [=](
+				not_null<PeerData*> peer,
+				TextWithEntities draft) {
+			Data::SetChatLinkDraft(peer, draft);
+			showPeerByLinkResolved(peer, info);
+		});
 	} else if (const auto name = std::get_if<QString>(&info.usernameOrId)) {
 		resolveUsername(*name, [=](not_null<PeerData*> peer) {
 			if (info.startAutoSubmit) {
@@ -352,6 +360,33 @@ void SessionNavigation::resolvePhone(
 	}).send();
 }
 
+void SessionNavigation::resolveChatLink(
+		const QString &slug,
+		Fn<void(not_null<PeerData*> peer, TextWithEntities draft)> done) {
+	_api.request(base::take(_resolveRequestId)).cancel();
+	_resolveRequestId = _api.request(MTPaccount_ResolveBusinessChatLink(
+		MTP_string(slug)
+	)).done([=](const MTPaccount_ResolvedBusinessChatLinks &result) {
+		_resolveRequestId = 0;
+		parentController()->hideLayer();
+		const auto &data = result.data();
+		_session->data().processUsers(data.vusers());
+		_session->data().processChats(data.vchats());
+
+		using namespace Api;
+		const auto peerId = peerFromMTP(data.vpeer());
+		done(_session->data().peer(peerId), {
+			qs(data.vmessage()),
+			EntitiesFromMTP(_session, data.ventities().value_or_empty())
+		});
+	}).fail([=](const MTP::Error &error) {
+		_resolveRequestId = 0;
+		if (error.code() == 400) {
+			showToast(tr::lng_confirm_phone_link_invalid(tr::now));
+		}
+	}).send();
+}
+
 void SessionNavigation::resolveUsername(
 		const QString &username,
 		Fn<void(not_null<PeerData*>)> done) {

Telegram/SourceFiles/window/window_session_controller.h

@@ -260,6 +260,9 @@ private:
 	void resolvePhone(
 		const QString &phone,
 		Fn<void(not_null<PeerData*>)> done);
+	void resolveChatLink(
+		const QString &slug,
+		Fn<void(not_null<PeerData*> peer, TextWithEntities draft)> done);
 	void resolveUsername(
 		const QString &username,
 		Fn<void(not_null<PeerData*>)> done);

Telegram/SourceFiles/window/window_session_controller_link_info.h

@@ -31,6 +31,7 @@ using RepliesByLinkInfo = std::variant<v::null_t, CommentId, ThreadId>;
 struct PeerByLinkInfo {
 	std::variant<QString, ChannelId> usernameOrId;
 	QString phone;
+	QString chatLinkSlug;
 	MsgId messageId = ShowAtUnreadMsgId;
 	StoryId storyId = 0;
 	RepliesByLinkInfo repliesInfo;