gamecenter: add KAuth helper for power profiles

CMakeLists.txt

@@ -104,6 +104,8 @@ find_package(KF6 ${KF_MIN_VERSION} REQUIRED COMPONENTS
     WindowSystem
 )
 
+find_package(KF6Auth ${KF_MIN_VERSION} QUIET)
+
 find_package(KF6KirigamiAddons 1.0.0 REQUIRED)
 
 qt_policy(SET QTP0001 NEW)

src/gamecenter/CMakeLists.txt

@@ -19,6 +19,34 @@ target_link_libraries(alakarte_gamecenter PRIVATE
     KF6::DBusAddons
 )
 
+if (KF6Auth_FOUND)
+    target_compile_definitions(alakarte_gamecenter PRIVATE
+        ALAKARTE_HAVE_KAUTH
+    )
+    target_link_libraries(alakarte_gamecenter PRIVATE
+        KF6::AuthCore
+    )
+
+    add_executable(alakarte_gamecenter_helper
+        gamecenterkauthhelper.cpp
+    )
+    target_link_libraries(alakarte_gamecenter_helper PRIVATE
+        Qt6::Core
+        Qt6::DBus
+        KF6::AuthCore
+    )
+
+    install(TARGETS alakarte_gamecenter_helper
+        DESTINATION ${KAUTH_HELPER_INSTALL_DIR}
+    )
+
+    install(FILES polkit/org.kde.alakarte.gamecenter.helper.policy
+        DESTINATION ${KAUTH_POLICY_FILES_INSTALL_DIR}
+    )
+
+    KAUTH_INSTALL_HELPER_FILES(alakarte_gamecenter_helper org.kde.alakarte.gamecenter.helper root)
+endif()
+
 set_target_properties(alakarte_gamecenter PROPERTIES
     OUTPUT_NAME "alakarte-gamecenter"
 )

src/gamecenter/gamecenterkauthhelper.cpp

@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2026 A-La-Karte Contributors
+
+#include <KAuth/ActionReply>
+#include <KAuth/HelperSupport>
+
+#include <QDBusConnection>
+#include <QDBusError>
+#include <QDBusInterface>
+#include <QDBusMessage>
+#include <QDBusReply>
+#include <QDBusVariant>
+#include <QObject>
+#include <QVariant>
+#include <QVariantMap>
+
+using namespace KAuth;
+
+static const QString kPowerProfilesService = QStringLiteral("net.hadess.PowerProfiles");
+static const QString kPowerProfilesPath = QStringLiteral("/net/hadess/PowerProfiles");
+static const QString kPowerProfilesInterface = QStringLiteral("net.hadess.PowerProfiles");
+
+class GameCenterHelper : public QObject
+{
+    Q_OBJECT
+
+public Q_SLOTS:
+    ActionReply setpowerprofile(const QVariantMap &args);
+};
+
+static QString unwrapStringArg(const QVariantMap &args, const QString &key)
+{
+    QVariant v = args.value(key);
+    if (v.canConvert<QDBusVariant>()) {
+        v = v.value<QDBusVariant>().variant();
+    }
+    return v.toString();
+}
+
+ActionReply GameCenterHelper::setpowerprofile(const QVariantMap &args)
+{
+    const QString profile = unwrapStringArg(args, QStringLiteral("profile"));
+    if (profile.isEmpty()) {
+        ActionReply reply = ActionReply::HelperErrorReply();
+        reply.setErrorDescription(QStringLiteral("missing profile"));
+        return reply;
+    }
+
+    QDBusConnection bus = QDBusConnection::systemBus();
+    if (!bus.isConnected()) {
+        ActionReply reply = ActionReply::HelperErrorReply();
+        reply.setErrorDescription(QStringLiteral("system bus not connected"));
+        return reply;
+    }
+
+    QDBusInterface props(kPowerProfilesService, kPowerProfilesPath, QStringLiteral("org.freedesktop.DBus.Properties"), bus);
+    if (!props.isValid()) {
+        ActionReply reply = ActionReply::HelperErrorReply();
+        reply.setErrorDescription(QStringLiteral("power-profiles-daemon D-Bus interface not available"));
+        return reply;
+    }
+
+    QDBusMessage msg =
+        QDBusMessage::createMethodCall(kPowerProfilesService, kPowerProfilesPath, QStringLiteral("org.freedesktop.DBus.Properties"), QStringLiteral("Set"));
+    msg.setArguments({kPowerProfilesInterface, QStringLiteral("ActiveProfile"), QVariant::fromValue(QDBusVariant(profile))});
+
+    const QDBusMessage replyMsg = bus.call(msg, QDBus::Block, 5000);
+    if (replyMsg.type() == QDBusMessage::ErrorMessage) {
+        ActionReply reply = ActionReply::HelperErrorReply();
+        reply.setErrorDescription(replyMsg.errorName() + QStringLiteral(": ") + replyMsg.errorMessage());
+        return reply;
+    }
+
+    return ActionReply::SuccessReply();
+}
+
+KAUTH_HELPER_MAIN("org.kde.alakarte.gamecenter.helper", GameCenterHelper)
+
+#include "gamecenterkauthhelper.moc"

src/gamecenter/polkit/org.kde.alakarte.gamecenter.helper.policy

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE policyconfig PUBLIC
+"-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
+"http://www.freedesktop.org/standards/PolicyKit/1.0/policyconfig.dtd">
+<policyconfig>
+  <vendor>A-La-Karte</vendor>
+  <vendor_url>https://invent.kde.org/marcoa/a-la-karte</vendor_url>
+  <icon_name>org.kde.alakarte</icon_name>
+  <action id="org.kde.alakarte.gamecenter.helper.setpowerprofile">
+    <description>Set system power profile</description>
+    <message>Authentication is required to set the system power profile.</message>
+    <defaults>
+      <allow_inactive>no</allow_inactive>
+      <allow_active>auth_admin_keep</allow_active>
+    </defaults>
+  </action>
+</policyconfig>