[Dedicated] Add sv_motd dvar, so serverowners can set motds

The motd will be displayed instead of the didyouknow messages in the
loadscreen

src/Components/Modules/Dedicated.cpp

@@ -330,6 +330,7 @@ namespace Components
 			Dvar::OnInit([] ()
 			{
 				Dvar::Register<const char*>("sv_sayName", "^7Console", Game::dvar_flag::DVAR_FLAG_NONE, "The name to pose as for 'say' commands");
+				Dvar::Register<const char*>("sv_motd", "", Game::dvar_flag::DVAR_FLAG_NONE, "A custom message of the day for servers");
 
 				// Say command
 				Command::AddSV("say", [] (Command::Params params)

src/Components/Modules/Menus.cpp

@@ -623,7 +623,16 @@ namespace Components
 		AssetHandler::OnFind(Game::XAssetType::ASSET_TYPE_MENUFILE, Menus::MenuFileLoad);
 
 		// Don't open connect menu
-		Utils::Hook::Nop(0x428E48, 5);
+		//Utils::Hook::Nop(0x428E48, 5);
+
+		// Use the connect menu open call to update server motds
+		Utils::Hook(0x428E48, []()
+		{
+			if (!Party::GetMotd().empty())
+			{
+				Dvar::Var("didyouknow").set(Party::GetMotd());
+			}
+		}, HOOK_CALL).install()->quick();
 
 		// Intercept menu painting
 		Utils::Hook(0x4FFBDF, Menus::IsMenuVisible, HOOK_CALL).install()->quick();

src/Components/Modules/Party.cpp

@@ -72,6 +72,11 @@ namespace Components
 		Command::Execute("openmenu menu_xboxlive_partyended");
 	}
 
+	std::string Party::GetMotd()
+	{
+		return Party::Container.motd;
+	}
+
 	Game::dvar_t* Party::RegisterMinPlayers(const char* name, int /*value*/, int /*min*/, int max, Game::dvar_flag flag, const char* description)
 	{
 		return Dvar::Register<int>(name, 1, 1, max, Game::dvar_flag::DVAR_FLAG_WRITEPROTECTED | flag, description).get<Game::dvar_t*>();
@@ -319,6 +324,11 @@ namespace Components
 			info.set("securityLevel", fmt::sprintf("%i", Dvar::Var("sv_securityLevel").get<int>()));
 			info.set("sv_running", (Dvar::Var("sv_running").get<bool>() ? "1" : "0"));
 
+			if (Dedicated::IsEnabled())
+			{
+				info.set("sv_motd", Dvar::Var("sv_motd").get<std::string>());
+			}
+
 			// Ensure mapname is set
 			if (info.get("mapname").empty() || (Dvar::Var("party_enable").get<bool>() && Dvar::Var("party_host").get<bool>() && !Dvar::Var("sv_running").get<bool>()))
 			{
@@ -398,6 +408,8 @@ namespace Components
 					}
 					else
 					{
+						Party::Container.motd = info.get("sv_motd");
+
 						if (Party::Container.matchType == 1) // Party
 						{
 							// Send playlist request

src/Components/Modules/Party.hpp

@@ -21,12 +21,15 @@ namespace Components
 
 		static void ConnectError(std::string message);
 
+		static std::string GetMotd();
+
 	private:
 		class JoinContainer
 		{
 		public:
 			Network::Address target;
 			std::string challenge;
+			std::string motd;
 			DWORD joinTime;
 			bool valid;
 			int matchType;
@@ -35,7 +38,7 @@ namespace Components
 
 			// Party-specific stuff
 			DWORD requestTime;
-			bool awaitingPlaylist;		
+			bool awaitingPlaylist;
 		};
 
 		static JoinContainer Container;