From 46886b4dcc4ef01d10ae852a928342cf88280bf0 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 22 Aug 2025 17:08:46 +0400
Subject: [PATCH] Support channel direct messages links.

---
 .../SourceFiles/core/local_url_handlers.cpp   |  4 +++-
 .../window/window_session_controller.cpp      | 19 +++++++++++++++++++
 .../window/window_session_controller.h        |  4 ++++
 .../window_session_controller_link_info.h     |  1 +
 4 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/core/local_url_handlers.cpp b/Telegram/SourceFiles/core/local_url_handlers.cpp
index e386bcc9fe..65d423a245 100644
--- a/Telegram/SourceFiles/core/local_url_handlers.cpp
+++ b/Telegram/SourceFiles/core/local_url_handlers.cpp
@@ -646,7 +646,9 @@ bool ResolveUsernameOrPhone(
 	const auto threadId = topicId ? topicId : threadParam.toInt();
 	const auto gameParam = params.value(u"game"_q);
 	const auto videot = params.value(u"t"_q);
-
+	if (params.contains(u"direct"_q)) {
+		resolveType = ResolveType::ChannelDirect;
+	}
 	if (!gameParam.isEmpty() && validDomain(gameParam)) {
 		startToken = gameParam;
 		resolveType = ResolveType::ShareGame;
diff --git a/Telegram/SourceFiles/window/window_session_controller.cpp b/Telegram/SourceFiles/window/window_session_controller.cpp
index db44cea1ce..4d3bf4b03f 100644
--- a/Telegram/SourceFiles/window/window_session_controller.cpp
+++ b/Telegram/SourceFiles/window/window_session_controller.cpp
@@ -431,6 +431,15 @@ void SessionNavigation::showPeerByLink(const PeerByLinkInfo &info) {
 	}
 }
 
+void SessionNavigation::fullInfoLoadedHook(not_null<PeerData*> peer) {
+	if (!_waitingDirectChannel || _waitingDirectChannel != peer) {
+		return;
+	}
+	const auto monoforum = peer->broadcastMonoforum();
+	const auto open = monoforum ? monoforum : peer.get();
+	showPeerHistory(open, SectionShow::Way::Forward, ShowAtUnreadMsgId);
+}
+
 void SessionNavigation::resolvePhone(
 		const QString &phone,
 		Fn<void(not_null<PeerData*>)> done) {
@@ -725,6 +734,13 @@ void SessionNavigation::showPeerByLinkResolved(
 		}
 	} else if (resolveType == ResolveType::Boost && peer->isChannel()) {
 		resolveBoostState(peer->asChannel());
+	} else if (resolveType == ResolveType::ChannelDirect
+		&& !peer->isFullLoaded()) {
+		_waitingDirectChannel = peer;
+		peer->updateFull();
+	} else if (const auto monoforum = peer->broadcastMonoforum()
+		; monoforum && resolveType == ResolveType::ChannelDirect) {
+		showPeerHistory(peer, params, ShowAtUnreadMsgId);
 	} else {
 		// Show specific posts only in channels / supergroups.
 		const auto msgId = peer->isChannel()
@@ -1554,6 +1570,9 @@ SessionController::SessionController(
 				}
 			}
 		}
+		if (update.flags & Data::PeerUpdate::Flag::FullInfo) {
+			fullInfoLoadedHook(update.peer);
+		}
 		return (update.flags & Data::PeerUpdate::Flag::FullInfo)
 			&& (update.peer == _showEditPeer);
 	}) | rpl::start_with_next([=] {
diff --git a/Telegram/SourceFiles/window/window_session_controller.h b/Telegram/SourceFiles/window/window_session_controller.h
index 80a2fbaea2..b20da580bc 100644
--- a/Telegram/SourceFiles/window/window_session_controller.h
+++ b/Telegram/SourceFiles/window/window_session_controller.h
@@ -316,6 +316,9 @@ public:
 
 	[[nodiscard]] virtual std::shared_ptr<ChatHelpers::Show> uiShow();
 
+protected:
+	void fullInfoLoadedHook(not_null<PeerData*> peer);
+
 private:
 	void resolvePhone(
 		const QString &phone,
@@ -362,6 +365,7 @@ private:
 	MTP::Sender _api;
 
 	mtpRequestId _resolveRequestId = 0;
+	PeerData *_waitingDirectChannel = nullptr;
 
 	History *_showingRepliesHistory = nullptr;
 	MsgId _showingRepliesRootId = 0;
diff --git a/Telegram/SourceFiles/window/window_session_controller_link_info.h b/Telegram/SourceFiles/window/window_session_controller_link_info.h
index 7608a07b9c..71590b4221 100644
--- a/Telegram/SourceFiles/window/window_session_controller_link_info.h
+++ b/Telegram/SourceFiles/window/window_session_controller_link_info.h
@@ -23,6 +23,7 @@ enum class ResolveType {
 	ShareGame,
 	Mention,
 	Boost,
+	ChannelDirect,
 	Profile,
 };