From c844602f5ce38621c6bd832155a43b0b8f8efc16 Mon Sep 17 00:00:00 2001
From: George Hazan <ghazan@miranda.im>
Date: Thu, 9 Mar 2023 16:24:26 +0300
Subject: =?UTF-8?q?fixes=20#3406=20(Telegram:=20=D0=BD=D0=B5=20=D1=81?=
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---
 protocols/Telegram/src/proto.h    |  1 +
 protocols/Telegram/src/server.cpp | 42 +++++++++++++++++++++++++++++++++++++++
 protocols/Telegram/src/stdafx.h   |  1 +
 3 files changed, 44 insertions(+)

diff --git a/protocols/Telegram/src/proto.h b/protocols/Telegram/src/proto.h
index 8dd9ca1fa9..83909acf1f 100644
--- a/protocols/Telegram/src/proto.h
+++ b/protocols/Telegram/src/proto.h
@@ -189,6 +189,7 @@ class CTelegramProto : public PROTO<CTelegramProto>
 	void ProcessAuth(TD::updateAuthorizationState *pObj);
 	void ProcessBasicGroup(TD::updateBasicGroup *pObj);
 	void ProcessChat(TD::updateNewChat *pObj);
+	void ProcessChatLastMessage(TD::updateChatLastMessage *pObj);
 	void ProcessChatPosition(TD::updateChatPosition *pObj);
 	void ProcessFile(TD::updateFile *pObj);
 	void ProcessGroups(TD::updateChatFilters *pObj);
diff --git a/protocols/Telegram/src/server.cpp b/protocols/Telegram/src/server.cpp
index 167b2badae..d3a5afcacd 100644
--- a/protocols/Telegram/src/server.cpp
+++ b/protocols/Telegram/src/server.cpp
@@ -138,6 +138,10 @@ void CTelegramProto::ProcessResponse(td::ClientManager::Response response)
 		ProcessGroups((TD::updateChatFilters *)response.object.get());
 		break;
 
+	case TD::updateChatLastMessage::ID:
+		ProcessChatLastMessage((TD::updateChatLastMessage *)response.object.get());
+		break;
+
 	case TD::updateChatPosition::ID:
 		ProcessChatPosition((TD::updateChatPosition *)response.object.get());
 		break;
@@ -321,6 +325,29 @@ void CTelegramProto::ProcessChat(TD::updateNewChat *pObj)
 	else debugLogA("Unknown chat id %lld, ignoring", chatId);
 }
 
+void CTelegramProto::ProcessChatLastMessage(TD::updateChatLastMessage *pObj)
+{
+	auto *pUser = FindChat(pObj->chat_id_);
+	if (pUser == nullptr) {
+		debugLogA("Unknown chat, skipping");
+		return;
+	}
+
+	if (pUser->hContact == INVALID_CONTACT_ID) {
+		debugLogA("Last message for a temporary contact, skipping");
+		return;
+	}
+
+	// according to #3406 we wipe history for the contacts from contacts' list
+	// but remove the contact itself if it's a temporary one
+	if (pObj->last_message_ == nullptr) {
+		if (Contact::OnList(pUser->hContact))
+			CallService(MS_HISTORY_EMPTY, pUser->hContact, TRUE);
+		else
+			db_delete_contact(pUser->hContact, true);
+	}
+}
+
 void CTelegramProto::ProcessChatPosition(TD::updateChatPosition *pObj)
 {
 	if (pObj->position_->get_id() != TD::chatPosition::ID) {
@@ -429,6 +456,17 @@ void CTelegramProto::ProcessMessage(TD::updateNewMessage *pObj)
 		return;
 	}
 
+	// make a temporary contact if needed
+	if (pUser->hContact == INVALID_CONTACT_ID) {
+		if (pUser->isGroupChat) {
+			debugLogA("spam from unknown group chat, ignored");
+			return;
+		}
+		
+		AddUser(pUser->id, false);
+		Contact::RemoveFromList(pUser->hContact);
+	}
+
 	char szId[100], szUserId[100];
 	_i64toa(pMessage->id_, szId, 10);
 
@@ -501,6 +539,9 @@ void CTelegramProto::ProcessUser(TD::updateUser *pObj)
 
 	if (!pUser->is_contact_) {
 		auto *pu = AddFakeUser(pUser->id_, false);
+		if (pu->hContact != INVALID_CONTACT_ID)
+			Contact::RemoveFromList(pu->hContact);
+
 		pu->wszFirstName = Utf2T(pUser->first_name_.c_str());
 		pu->wszLastName = Utf2T(pUser->last_name_.c_str());
 		if (pUser->usernames_) {
@@ -527,6 +568,7 @@ void CTelegramProto::ProcessUser(TD::updateUser *pObj)
 		UpdateString(pu->hContact, "Nick", pUser->usernames_->editable_username_);
 	if (pu->hContact == 0)
 		pu->wszNick = Contact::GetInfo(CNF_DISPLAY, 0, m_szModuleName);
+	Contact::PutOnList(pu->hContact);
 
 	if (pUser->is_premium_)
 		ExtraIcon_SetIconByName(g_plugin.m_hIcon, pu->hContact, "tg_premium");
diff --git a/protocols/Telegram/src/stdafx.h b/protocols/Telegram/src/stdafx.h
index 1e5a33925a..0d24bfcf3c 100644
--- a/protocols/Telegram/src/stdafx.h
+++ b/protocols/Telegram/src/stdafx.h
@@ -19,6 +19,7 @@
 #include <m_contacts.h>
 #include <m_database.h>
 #include <m_extraicons.h>
+#include <m_history.h>
 #include <m_icolib.h>
 #include <m_langpack.h>
 #include <m_message.h>
-- 
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