PyQt6 QtDBus How to Create Method Call

Malonn

I cannot seem to successfully create a method call to the D-Bus on Linux. Here's some code:

class DBusAdaptor(QDBusAbstractAdaptor):
    pyqtClassInfo('D-Bus Interface', 'org.pyqt.LinuxCleaner')
    pyqtClassInfo('D-Bus Path', '/LinuxCleaner')

    def __init__(self, parent):
        super().__init__(parent)
        connect = QDBusConnection.connectToBus(QDBusConnection.BusType.SessionBus, 'LinuxCleaner')
        conn_iface = connect.interface()
        if not connect.registerService('org.pyqt.LinuxCleaner'):
            print('Failed to register service')
        if not connect.registerObject('/LinuxCleaner', self):
            print('Failed to register Object!')
        print(connect.baseService())
        self._check_polkit_privilege(conn_iface, 'org.pyqt.LinuxCleaner')

    def _check_polkit_privilege(self, conn_iface, service):
        """
        :param conn_iface: D-Bus connection interface.
        :type conn_iface: QDBusConnectionInterface
        :param service: D-Bus service name.
        :type service: str
        :return:
        """
        pid = conn_iface.servicePid(service).value()
        interface = QDBusInterface('org.freedesktop.PolicyKit1',
                                   '/org/freedesktop/PolicyKit1/Authority',
                                   'org.freedesktop.PolicyKit1.Authority',
                                   QDBusConnection.systemBus())
        struct = QDBusArgument()
        struct.beginStructure()
        struct.add('unix-process', 10)
        struct.beginMap(10, 3)
        struct.beginMapEntry()
        struct.add('pid', 10)
        struct.add(pid, 3)
        struct.endMapEntry()
        struct.beginMapEntry()
        struct.add('start-time', 10)
        struct.add(0, 3)
        struct.endMapEntry()
        struct.endMap()
        struct.endStructure()
        struct.add('org.pyqt.LinuxCleaner.auth', 10)
        struct.beginMap(10, 10)
        struct.beginMapEntry()
        struct.add('AllowUserInteraction', 10)
        struct.add('true', 10)
        struct.endMapEntry()
        struct.endMap()
        struct.add(1, 3)
        struct.add('', 10)
        reply = interface.call('CheckAuthorization', struct)
        print(reply.errorMessage())

"CheckAuthorization" requires:

IN: (string {string: uint32, string: uint64})
IN: string
IN: {string: string}
IN: uint32
IN: string

The result (error message) is Type of message, “((sa{su}))”, does not match expected type “((sa{sv})sa{ss}us)”. After digging for a day, {sv} means {string:variant}, and the Qt variant to pass is a QDBusVariant. This is my problem. beginMap() requires two QMetaType's and QDBusVariant is not a registered meta type. How would I pass a QDBusVariant to beginMap()? I also tried another way:

message = QDBusMessage.createMethodCall(interface.service(),
                                                interface.path(),
                                                interface.interface(),
                                                'CheckAuthorization')
pid = pid + (1 << 32)
st = 0 + (1 << 64)
message << 'unix-process'
message << 'pid' << pid
reply = QDBusConnection.systemBus().call(message)

Bear with that code, as its early in troubleshooting as it took me nowhere. That returns (ssx). With that way, I can't figure out how to create a structure and dictionary (map) or array to send to the 'call()`.

Any ideas how to solve this with either approach? I've tried 16 hours worth of things, and none of them allow me to successfully call the method "CheckAuthorization". Most things I try end up with a Marshalling error, saying a PyQt_PyObject is not registered with QtDBus.

Malonn

I had posted this on StackOverflow back in July as well, and I received an answer today. I'll just link to the answer, which I haven't tested because I am in the middle of a different project. There are a couple good comments as well, so a link would be more prudent, I believe.

StackOverflow