downloadhelpers.cpp

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/

#include "downloadhelpers.h"
#include <QFile>
#include <QtDebug>
#include <util/sll/either.h>
#include <util/sll/visitor.h>
#include <util/sys/paths.h>
#include <util/xpc/util.h>
#include <util/threads/coro/future.h>
#include <util/threads/coro.h>
#include <interfaces/core/ientitymanager.h>

namespace LC::Util
{
    Task<TempDownload_t> DownloadAsTemporary (IEntityManager& iem, QUrl url, DownloadParams params)
    {
        const auto& path = GetTemporaryName ();
        auto e = MakeEntity (url,
                path,
                DoNotSaveInHistory |
                    Internal |
                    DoNotNotifyUser |
                    NotPersistent);
        e.Mime_ = std::move (params.Mime_);
        e.Additional_ = std::move (params.Additional_);

        const auto res = iem.DelegateEntity (e);
        if (!res)
        {
            qWarning () << "delegation failed for" << url;
            co_return IDownload::Error
            {
                IDownload::Error::Type::LocalError,
                QObject::tr ("Unable to find a downloader plugin.")
            };
        }

        const auto result = co_await res.DownloadResult_;
        const auto success [[maybe_unused]] = co_await WithHandler (result,
                [&url] (const IDownload::Error& error)
                {
                    qWarning () << "failed downloading" << url << static_cast<int> (error.Type_) << error.Message_;
                });

        QFile file { path };
        auto removeGuard = MakeScopeGuard ([&file] { file.remove (); });
        if (!file.open (QIODevice::ReadOnly))
        {
            qWarning () << "unable to open downloaded file" << file.errorString ();
            co_return IDownload::Error
            {
                IDownload::Error::Type::LocalError,
                QObject::tr ("Unable to open local file: %1.").arg (file.errorString ())
            };
        }

        co_return file.readAll ();
    }
}