From 5c89dfad85a05fda6aeabe2b98017fcc8b01c624 Mon Sep 17 00:00:00 2001
From: Ilya Fedin <fedin-ilja2010@ya.ru>
Date: Mon, 2 Mar 2020 11:44:56 +0400
Subject: [PATCH] Implement LastUserInputTime on Linux

This is a dbus implementation, ideally a X11 implementation should be added as a fallback to get it work on non-mainstream DEs (and WMs)
---
 .../platform/linux/specific_linux.cpp         | 29 +++++++++++++++++++
 .../platform/linux/specific_linux.h           |  4 ---
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/Telegram/SourceFiles/platform/linux/specific_linux.cpp b/Telegram/SourceFiles/platform/linux/specific_linux.cpp
index 4e6ee35c88..895529b11a 100644
--- a/Telegram/SourceFiles/platform/linux/specific_linux.cpp
+++ b/Telegram/SourceFiles/platform/linux/specific_linux.cpp
@@ -26,6 +26,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #ifndef TDESKTOP_DISABLE_DBUS_INTEGRATION
 #include <QtDBus/QDBusInterface>
+#include <QtDBus/QDBusConnection>
+#include <QtDBus/QDBusMessage>
+#include <QtDBus/QDBusReply>
+#include <QtDBus/QDBusError>
 #endif
 
 #include <sys/stat.h>
@@ -341,6 +345,31 @@ QString GetIconName() {
 	return IconName;
 }
 
+std::optional<crl::time> LastUserInputTime() {
+	// TODO: a fallback pure-X11 implementation, this one covers only major DEs on X11 and Wayland
+	// an example: https://stackoverflow.com/q/9049087
+#ifndef TDESKTOP_DISABLE_DBUS_INTEGRATION
+	static const auto message = QDBusMessage::createMethodCall(
+		qsl("org.freedesktop.ScreenSaver"),
+		qsl("/org/freedesktop/ScreenSaver"),
+		qsl("org.freedesktop.ScreenSaver"),
+		qsl("GetSessionIdleTime"));
+
+	const QDBusReply<uint> reply = QDBusConnection::sessionBus().call(
+		message);
+
+	if (reply.isValid()) {
+		return (crl::now() - static_cast<crl::time>(reply.value()));
+	} else if (reply.error().type() != QDBusError::ServiceUnknown) {
+		LOG(("Unable to get last user input time: %1: %2")
+			.arg(reply.error().name())
+			.arg(reply.error().message()));
+	}
+#endif // !TDESKTOP_DISABLE_DBUS_INTEGRATION
+
+	return std::nullopt;
+}
+
 } // namespace Platform
 
 namespace {
diff --git a/Telegram/SourceFiles/platform/linux/specific_linux.h b/Telegram/SourceFiles/platform/linux/specific_linux.h
index 526a2aec58..7f18032cb9 100644
--- a/Telegram/SourceFiles/platform/linux/specific_linux.h
+++ b/Telegram/SourceFiles/platform/linux/specific_linux.h
@@ -37,10 +37,6 @@ QString GetLauncherFilename();
 
 QString GetIconName();
 
-inline std::optional<crl::time> LastUserInputTime() {
-	return std::nullopt;
-}
-
 inline void IgnoreApplicationActivationRightNow() {
 }