// This is an example not a library
/*
    SPDX-FileCopyrightText: 2008 Daniel Nicoletti <dantti85-pk@yahoo.com.br>
    SPDX-FileCopyrightText: 2009 Radek Novacek <rnovacek@redhat.com>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "PkExampleHelper.h"
#include "examplesadaptor.h"

#include <polkitqt1-authority.h>

#include <QDBusConnection>
#include <QTimer>
#include <QDebug>
#include <QDomDocument>

#define MINUTE 60000

using namespace PolkitQt1;

PkExampleHelper::PkExampleHelper(int &argc, char **argv)
        : QCoreApplication(argc, argv)
{
    qDebug() << "Creating Helper";
    (void) new ExamplesAdaptor(this);
    // Register the DBus service
    if (!QDBusConnection::systemBus().registerService("org.qt.policykit.examples")) {
        qDebug() << QDBusConnection::systemBus().lastError().message();;
        QTimer::singleShot(0, this, SLOT(quit()));
        return;
    }

    if (!QDBusConnection::systemBus().registerObject("/", this)) {
        qDebug() << "unable to register service interface to dbus";
        QTimer::singleShot(0, this, SLOT(quit()));
        return;
    }
    // Normally you will set a timeout so your application can
    // free some resources of the poor client machine ;)
    QTimer::singleShot(MINUTE, this, SLOT(quit()));
}

PkExampleHelper::~PkExampleHelper()
{
    qDebug() << "Destroying Helper";
}

bool PkExampleHelper::set(const QString &action)
{
    qDebug() << "PkExampleHelper::set" << action;
    // message().service() is the service name of the caller
    // We can check if the caller is authorized to the following action
    Authority::Result result;
    SystemBusNameSubject subject(message().service());

    result = Authority::instance()->checkAuthorizationSync("org.qt.policykit.examples.set",
             subject , Authority::AllowUserInteraction);
    if (result == Authority::Yes) {
        qDebug() << message().service() << QString("Implicit authorization set to") << action;
        // Caller is authorized so we can perform the action
        return setValue(action);
    } else {
        qDebug() << message().service() << QString("Can't set the implicit authorization");
        // Caller is not authorized so the action can't be performed
        return false;
    }
}

bool PkExampleHelper::setValue(const QString &action)
{
    // This action must be authorized first. It will set the implicit
    // authorization for the Shout action by editing the .policy file
    QDomDocument doc = QDomDocument("policy");
    QFile file("/usr/share/polkit-1/actions/org.qt.policykit.examples.policy");
    if (!file.open(QIODevice::ReadOnly))
        return false;
    doc.setContent(&file);
    file.close();
    QDomElement el = doc.firstChildElement("policyconfig").
                     firstChildElement("action");
    while (!el.isNull() && el.attribute("id", QString()) != "org.qt.policykit.examples.shout") {
        el = el.nextSiblingElement("action");
    }
    el = el.firstChildElement("defaults");
    el = el.firstChildElement("allow_active");
    if (el.isNull())
        return false;
    el.firstChild().toText().setData(action);
    if (!file.open(QIODevice::WriteOnly))
        return false;
    QTextStream stream(&file);
    doc.save(stream, 2);
    file.close();
    return true;
}