In-App purchasing demo

/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef INAPPSTORE_H
#define INAPPSTORE_H

#include <QObject>
#include <QMutex>
#include <QHash>

#include "inappproduct.h"
#include "inapppurchasebackend.h"

class InAppProduct;
class InAppTransaction;
class InAppPurchaseBackend;
class InAppStorePrivate
{
public:
    InAppStorePrivate()
        : backend(0)
        , hasCalledInitialize(false)
        , pendingRestorePurchases(false)
    {
    }

    ~InAppStorePrivate()
    {
        delete backend;
    }

    QHash<QString, InAppProduct::ProductType> pendingProducts;
    QHash<QString, InAppProduct *> registeredProducts;
    InAppPurchaseBackend *backend;
    bool hasCalledInitialize;
    bool pendingRestorePurchases;
};
class InAppStore: public QObject
{
    Q_OBJECT

public:
    explicit InAppStore(QObject *parent = nullptr);
    ~InAppStore();

    Q_INVOKABLE void restorePurchases();
    Q_INVOKABLE void registerProduct(InAppProduct::ProductType productType, const QString &identifier);
    Q_INVOKABLE InAppProduct *registeredProduct(const QString &identifier) const;
    Q_INVOKABLE void setPlatformProperty(const QString &propertyName, const QString &value);

signals:
    void productRegistered(InAppProduct *product);
    void productUnknown(InAppProduct::ProductType productType, const QString &identifier);
    void transactionReady(InAppTransaction *transaction);

private Q_SLOTS:
    void registerPendingProducts();
    void registerProduct(InAppProduct *);

private:
    void setupBackend();

    Q_DISABLE_COPY(InAppStore)
    QSharedPointer<InAppStorePrivate> d;
};

#endif // INAPPSTORE_H